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martedì 28 giugno 2011

Fukushima: day 107, 108 & 109

Dear Colleagues:

109th day!

I. Recapping on the water purification system
With the day light, TEPCO investigated the water leak location and found that the 10 cm dia vinyl hose came off. The temporary hose is designed with 10 kg/cm2 pressure. The operational pressure was approximately 8 kg/cm2, however, it may went up by adjusting a valve. The leakage was said to be limited to just one cubic meters, lasting for 2 minutes. TEPCO is checking all the valves with the similar pipe fittings. From their explanation, I got an impression that a hose clamp came off due to the high pressure. By replacing the faulty hose, the system went back into operation at 2:36 PM. Currently 14 tons/h of the purified water and additional 2 tons/h from the river water taken at nearby dam are being injected into the 1F1-3.
Obviously more robust pipeline should be constructed, such as by using a hard plastic piping, since the water injection line is in a safety class for the current accident management. Since another water line is available from the nearby dam to the pure water tank, redundancy is barely sufficient. It is anticipated that TEPCO may be using the water purification system for years and I believe more reliable setup is going to be necessary.
TEPCO also released a set of schematics of the water purification system as attached (in Japanese,http://www.tepco.co.jp/nu/fukushima-np/images/handouts_110627_03-j.pdf) There are few new issues I did not realize. One is that there is an independent oil separator in front of the Kurion’s SMZ sorption tank. If the degradation of the DF in past several days came from oil impregnates, whether this stage is working properly should be investigated. We need very high grade oil removal for adequate operation of the cesium adsorption and co-deposition processes. The detailed spec has not been released yet for this part of the process.
Secondly, it is stated that the AREVA’s process and Kurion’s process can be switched only by manipulation of valves. I believe it strongly depends on the worker doses received during replacement of sober in the Kurion’s process. According to their operational log, the following maintenance outages are recorded; 23 June 13:00-14:44; 24 June 10:00-12:50: 25 June 10:00-15:00; 26 June 10:00-18:10. During these outage time, the system was flushed by lower contaminated water before changing sober. Estimated availability appears like 80%, which is not so high. More importantly, a daily maintenance for manual exchange of sober became necessary, resulting in the low availability. If the worker dose is not so high during this maintenance, say in a range of 100-200 microSv a day, it might be tolerable. If it is much more than this, TEPCO should seriously consider switching the AREVA’s and Kurion’s processes. This will not only reduce the worker doses, but also improve availability by reducing the frequency of flushing operation.
As of the evening of June 27, as much as 7610 tons of highly contaminated water has been purified.

II. Recapping on recovery of the secondary containment system for 1F1
I introduced this issue in Earthquake (96). This is a kind of Fukushima version of the infamous Chernobyl “sarcophagus” and is called “cover” this time in Japan.
Today, TEPCO announced that the on-site construction of cover has started, scheduled to be completed in late September. This cover is of the size of 41x45x52(H) meters. There will be assembled by using two 750 ton remote operation crawler cranes.

III. Recapping on nitrogen gas injection in 1F2.
TEPCO started today injection of nitrogen gas into the 1F2 pressure containment system for prevention of hydrogen explosion, as soon as a permission is obtained from NISA. A similar operation has been started in 1F1 since April.

Well, let me stop here tonight.

Gen Saji
______________________________________________________________________________
(Previous e-mail sent at 11:15 PM on June 27 as Earthquake (108))
Dear Colleagues:

108th day!

I. Recapping on the water purification system
At 4:20 PM of June 27, TEPCO announced that they have started to inject the purified water into the reactor vessels of 1F1-3, thus closing the water cooling chain and preventing an increase in the volume of highly contaminated water so far accumulated to more than 110,000 tons. The purified water line was laid out in parallel to the pure water line so far used by extracting natural water from a nearby dam. TEPCO also commented that the unanticipated high dose rate in Kurion’s system calls for reevaluation of replacement procedures. I think TEPCO need to find solution for the first stage SMZ sorption tanks for removal of oil contamination. It appears that oil contamination also affects DF of the AREVA’s co-precipitation process. The operation itself is a R&D with cut and try.
However, the operation had to be suspended at 5:55 PM due to a water leakage found in its 4 km pipe line. TEPCO plans to fix the leakage tomorrow. During suspension, the water injection has been switched back to the old tank from the dam.

II. Recapping on accumulation of “radioactive” sludge and ashes
I introduced this issue more recently in Earthquake (95) and (97). The National Center of Counter Measures for Nuclear Disasters introduced a new guideline for disposal of “radioactive” sludge on June 16. The new guideline specifies, for incineration of sludge, furnaces should have filtration to prevent releasing radioactivity. The sludge and ash should be kept in a shielded facility when the activity is higher than 100,000 Bq/kg. The way for ultimate disposal is being investigated. The lower activation wastes can be disposed in the municipal disposal facility with dose to the individual of the nearby residents will not receive more than 10 microSv/y, when the activity level exceed 8000 Bq/kg but less than 100,000 Bq/kg. For very low activation wastes, lower than 8,000 Bq/kg, can be used for land fill purposes, not for residence purposes, after water proofing.
I do not know how this guideline was developed. However, it is becoming obvious that this kind of deterministic graded guideline does not work in the real world. This should have been a risk approach with adequate exposure scenario, without showing safe/unsafe borderline, since there is no such distinct boundary in the radiation safety. There were a few municipal waste water treatment facilities that own the waste treatment facilities with a final fused disposal process. Most of them have been selling sludge for making composts for farmers. However, the manufactures refused to accept the “contaminated sewage wastes”, even if the activity level is of the order of 1000 Bq/kg, lower than the guideline of 5000 Bq/kg for soil used for allowing planting rice sprout. Many of the municipal sewage facilities are forced to urgently construct in-site storage facilities but it is near their limit. For example, the North Fukushima Central Water Treatment Facility has already accumulated a stock of 1200 tons. There is no immediate solution in sight. They are crying that the national government take responsibility of disposal of the “radioactive” sewage wastes, not just making a guideline.
This issue is glowing to reveal affecting much wider areas than expected. Later today it was announced from Tokyo Metropolitan Sanitary Stations that a fly ash sample from Edogawa Ward showed 9740 Bq/kg.

III. Recapping on City-wide radiation health assessment in Fukushima
I started to monitor this issue in my Earhquke (77) and (99). The Fukushima Prefecture Government is preparing to initiate radiation health assessment for their entire population of 2.02 million people, for monitoring their radiation health as long as for coming 30 years. Today their “preceding survey” has been started to measure internal exposure, mainly thyroid doses, by selecting 120 residents out of 28,000 villagers living in the highly contaminated region (within “scheduled (and organized) evacuation” zone) from Iidate-mura, Namie-machi and a part of Kawamata-cho. These samples were picked to avoid the ‘selection effect’, to designate evenly distributed cohort group considering life pattern and activities at the time of the plume passage. Their ages were distributed from 4 to 69 years old. The early “preceding survey” is obviously needed, in view of half life of 8.04d for I-131. It is generally recognized that I-131 detection should be performed within 10 half life period, to be able to estimate the thyroid doses received at the time of plume passage. The measurement is performed by using a “whole body counter” with a gun-shaped scintillator detector at the
National Institute of Radiological Sciences (NIRS?in Chiba. Ten people went through this assessment today. NIRA intend to develop a computer system to estimate thyroid doses without actually surveying the entire population by the whole body counters. The dose assessment of the entire population will be made on the basis of questioners to be practical.
In comparison with this, I respect Russian scientists at the time of the Chernobyl accident. By May 5, 1986 (the accident occurred on 26 April), at Bragin District, as many as 4000 people went through the thyroid dose measurement, by using a makeshift lead cover to reduce background below patient’s shoulder (Ref. The International Chernobyl Project: Technical Report, IAEA (1991). I am greatly concerned whether meaningful monitoring results can become available after 14 times of the half life! As a matter of fact I tried to estimate release fraction of soil samples a few weeks ago, but I had to give up since the results were unreasonable.

IV Amelioration of farm land
The Ministry of Agriculture, Forestry and Fishery (MAFF) initiated a new project at Kawamata-cho for amelioration of farm land by planting Kenaf (Hibiscus cannabinus), a kind of hemp, Amaranthus (there are 42 different species. Perhaps it corresponds to Amaranthus caudatus?) and Quínua (It was reported by the word “kinua” but it seems to correspond to Chenopodium quino). MAFF has already started another amelioration project by planting sunflower and rape seed at Iidate-mura in late May. The sunflower was tested very effective in the amelioration of Chernobyl contaminated farm land in Ukraine. The Cs-137 is concentrated in its roots and strontium in its seed coat. The bio-oil can be extracted from the seed without contamination of radioactive species. The effectiveness of this method was very widely reported in Japan through Far East Research Corporation ( http://www.ntv.co.jp/FERC/200x_index.html , in Japanese ) in F.E.R.C Research Report - File No.1045 ( http://www.ntv.co.jp/FERC/research/20001203/f1045.html
, in Japanese) This method is being developed to extract gold from the soil. It is an controversial new technology called “PHYTOREM” ( In situ remediation of contaminated soil by plants "PHYTOREM" web site (http://www.ensaia.u-nancy.fr/Recherche/solenviro/phytorem.htm). I did not know this new science frontier and found very interesting.

V Contamination of fish in Fukushima
The government ordered to suspend marketing Plecoglossus altivelis altivelis caught from the river streams from the Abukuma Mountain Chains, on which the highly contaminated corridor stretches from Fukushima Daiichi through Namie-cho and Iidate-mura. The fish samples from Abukuma River, Mano-gawa and Nitta-gawa showed 1260, 3300 and 4400 Bq, respectively.
On the other hands, no strontium contamination was found from the sea water fish samples of Sardinops melanostictus, Engraulis japonica and Ammodytes personatus. It is perhaps due to the fact that release of strontium is much reduced this time due to the decontamination effect of the suppression pool water before environmental release compared with the case of the Chernobyl accident. Where this measurement made was not disclosed.
It was also reported today from Nuclear Safety Commission that 140 Bq/kg of Sr-89 was detected first time in the sea bottom sludge samples taken at 3 km off shore of the Fukushima Daiichi. They are asking for investigation of crustaceans and fish living at the sea bottom. Among such fish, Pleuronectiformes is a favorite fish for many Japanese people.

Well, let me stop here tonight.


Genn Saji
_________________________________________________________________________________
(Previous e-mail sent at 00:54 AM on June 27 as Earthquake (107))
Dear Colleagues:

107th day!

I. Recapping on the water purification system
TEPCO made an announcement today that they plan to start the water injection operation by using the purified water as early as Monday afternoon, June 27, by saying that the mission objectives of the water purification system have been successfully completed. If successful, this will close the water cooling chain to prevent an increase in the volume of highly contaminated water so far accumulated to more than 110,000 tons. On June 25, they inspected the system as well as replaced the sober from the US Kurion’s process. TEPCO is said to be planning to make an overall judgment for the future operational schedule and procedures on Monday.
For my memory sake, I developed the attached memo which explains the amount of nuclear species released to the highly contaminated water. It is to develop an equivalence of Table 2: Estimates of the principal radionuclides released in the accident, in Annex J of UNSCEAR 2000, Exposure and effects of the Chernobyl accident. The memo assumes that some portion of “intermediate” and “refractory species (including the fuel particles) can have settled down at the bottom of the pool of contaminated water accumulated in the basements of Reactor Buildings, Turbine Halls, as well as “trenches). In developing the memo, I realized an importance of future sampling of the contaminated water sludge, which is likely rich in “intermediate” and “refractory” species, including fuel particles. Currently TEPCO is trying to introduce a new robot “Quince”, developed by a Japanese team, which has a capability of sampling water. Please visit http://www.tepco.co.jp/en/news/110311/index-e.html to download
Robot:Quince(4.95MB) (videoed on Jun 16, 2011)


II. Boron in the 1F3 SFP
TEPCO announced that they are pouring 90 tons of 2% borated water into the 1F3 spent fuel pool (SFP). This operation is said to prevent the alkalization of the pool due to accumulation of concrete debris. The pH measured last month was as high as 11.2. In the SFP, there are aluminum racks which should be kept in a neutral to slightly acidic condition. A similar operation is also being planned in 1F1.
Also, TEPCO announced that the external air cooler are being installed to the 1F3 SFP and scheduled to be ready by June 30, following with the 1F2, which has been working since May 31.

III. Nitrogen gas injection ready in 1F2.
TEPCO has been saying that they are ready to start injecting nitrogen gas into the 1F2 pressure containment system for prevention of hydrogen explosion, as soon as a permission is obtained from NISA. By filling the containment vessel with nitrogen, some amount of radioactive materials are expected to be released to the environment. In 1F1, the nitrogen gas charging have been performed since April. I think this is a prudent operation, however, the situation is a bit different from the successful operation in 1F1. It is because the damage to the reactor pressure boundary as well as to the pressure contaiment vessel seem to be different for 1F1 and 1F3. By struggling to install the temporary level gauge into 1F2, the reactor vessel pressure was only 0.1 kg/cm2 and there can be a larger crack. Also, the color of highly contaminated water observed in the 1F2 a few days ago indicated a heavy contamination with hematite (Fe2O3). This indicate a leakage from unknown region where there was a heavy accumulation of hematite. I am puzzled where this much of hematite came from. In 1F1 and 1F3, the color of the highly contaminated water in the basement of the reactor buildings looked yellowish, indicating a presence of strontium in the water. When metallic strontium reacts with water, it will dissolve into the water by changing the color slightly yellowish. TEPCO should be prepared in the situation that the the containment vessel is much leaky than in the case of 1F1.

IV. 1F1 Pool water sampling data released
I overlooked to introduced this data released on June 24. TEPCO showed that the results of the pool water sampling data (sampled on June 22) from 1F1 as follows:
Species Half Life Concentration (Bq/cm3)
Cs-134 2a 12,000
Cs-137 30a 14,000
I-131 8.04d 68
The activation is very likely came from contaminated debris fallen into the pool and is not due to damage of the fuels. Sith this, all four data indicate that the gross fuel damage did not occur in any of the SFPs.

Well, let me stop here tonight.


Genn Saji
____________
- giugno 28, 2011 Nessun commento:
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lunedì 27 giugno 2011

Japan’s meltdowns demand new no-nukes thinking

Japan’s meltdowns demand new no-nukes thinking
By Amy Goodman

New details are emerging that indicate the Fukushima nuclear disaster in Japan is far worse than previously known, with three of the four affected reactors experiencing full meltdowns. Meanwhile, in the U.S., massive flooding along the Missouri River has put Nebraska’s two nuclear plants, both near Omaha, on alert. The Cooper Nuclear Station declared a low-level emergency and will have to close down if the river rises another 3 inches. The Fort Calhoun nuclear power plant has been shut down since April 9, in part due to flooding. At Prairie Island, Minn., extreme heat caused the nuclear plant’s two emergency diesel generators to fail. Emergency-generator failure was one of the key problems that led to the meltdowns at Fukushima.

In May, in reaction to the Fukushima disaster, Nikolaus Berlakovich, Austria’s federal minister of agriculture, forestry, environment and water management, convened a meeting of Europe’s 11 nuclear-free countries. Those gathered resolved to push for a nuclear-free Europe, even as Germany announced it will phase out nuclear power in 10 years and push ahead on renewable-energy research. Then, in last week’s national elections in Italy, more than 90 percent of voters resoundingly rejected Prime Minister Silvio Berlusconi’s plans to restart the country’s nuclear power program.

Leaders of national nuclear-energy programs are gathering this week in Vienna for the International Atomic Energy Agency’s Ministerial Conference on Nuclear Safety. The meeting was called in response to Fukushima. Ironically, the ministers, including U.S. Nuclear Regulatory Commission (NRC) Chairman Gregory Jaczko, held their meeting safely in a country with no nuclear power plants. Austria is at the forefront of Europe’s new anti-nuclear alliance.

The IAEA meeting was preceded by the release of an Associated Press report stating that consistently, and for decades, U.S. nuclear regulators lowered the bar on safety regulations in order to allow operators to keep the nuclear plants running. Nuclear power plants were constructed in the U.S. in the decades leading up to the Three Mile Island disaster in 1979. These 104 plants are all getting on in years. The original licenses were granted for 40 years.

The AP’s Jeff Donn wrote, “When the first ones were being built in the 1960s and 1970s, it was expected that they would be replaced with improved models long before those licenses expired.” Enormous upfront construction costs, safety concerns and the problem of storing radioactive nuclear waste for thousands of years drove away private investors. Instead of developing and building new nuclear plants, the owners—typically for-profit companies like Exelon Corp., a major donor to the Obama campaigns through the years—simply try to run the old reactors longer, applying to the NRC for 20-year extensions.

Europe, already ahead of the U.S. in development and deployment of renewable-energy technology, is now poised to accelerate in the field. In the U.S., the NRC has provided preliminary approval of the Southern Company’s planned expansion of the Vogtle power plant in Georgia, which would allow the first construction of new nuclear power plants in the U.S. since Three Mile Island. The project got a boost from President Barack Obama, who pledged an $8.3 billion federal loan guarantee. Southern plans on using Westinghouse’s new AP1000 reactor. But a coalition of environmental groups has filed to block the permit, noting that the new reactor design is inherently unsafe.

Obama established what he called his Blue Ribbon Commission on America’s Nuclear Future. One of its 15 members is John Rowe, the chairman and chief executive officer of Exelon Corp. (the same nuclear-energy company that has lavished campaign contributions on Obama). The commission made a fact-finding trip to Japan to see how that country was thriving with nuclear power—one month before the Fukushima disaster. In May, the commission reiterated its position, which is Obama’s position, that nuclear ought to be part of the U.S. energy mix.

The U.S. energy mix, instead, should include a national jobs program to make existing buildings energy efficient, and to install solar and wind-power technology where appropriate. These jobs could not be outsourced and would immediately reduce our energy use and, thus, our reliance on foreign oil and domestic coal and nuclear. Such a program could favor U.S. manufacturers, to keep the money in the U.S. economy. That would be a simple, effective and sane reaction to Fukushima.

Denis Moynihan contributed research to this column.

Amy Goodman is the host of “Democracy Now!,” a daily international TV/radio news hour airing on more than 900 stations in North America. She is the author of “Breaking the Sound Barrier,” recently released in paperback and now a New York Times best-seller.

© 2011 Amy Goodman, distributed by King Features Syndicate

- giugno 27, 2011 Nessun commento:
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sabato 25 giugno 2011

Fukushima: day 105 & 106

Dear Colleagues:

106th day!

I. Recapping on the water purification system
Later last night, TEPCO made an announcement that the targeted DF of 100,000 was achieved, by combing the Kurion’s process and AREVA’s process, although the former system is still under the projected DF. They posted the results of sampling data of DF before and after the water treatment as below released on June 24:
Species Kurion’s process AREVA’s process Integrated
I-131 5.8 1.3 7.6
Cs-134 16 6700 1.1E+06
Cs-137 17 7200 1.2E+05
These results are strange, when compared with the sampling data released on June 22.
Species Kurion’s process AREVA’s process Integrated
I-131 7 1.1 7.8
Cs-134 41 >430 >2.0E+04 (limited by detection limit)
Cs-137 46 >480 >2.2E+04 (limited by detection limit)
TEPCO explained in June 23 that one bypass valve was inadvertently left open, feeding water from the top sorption vessel directly to the Ag-impregnated zeolite sorption line. By closing the valve, the DF decreased. The new sampling results seem to more pointing towards that the valve can be open as indicated by the hand-written marking, bypassing a portion of Skid 4. Also likely is the case that one of the cesium sorption skid has gone through “breakthrough.”
The most recent sampling results released June 25 are more discouraging:
Species Kurion’s process AREVA’s process Integrated
I-131 6.3 1.1 6.6
Cs-134 34 1800 6.3E+04
Cs-137 35 1800 6.3E+04
These results indicate that still further optimization, including finding better sober for SMZ tank. So far, 4500 tons of water has been purified.
The unexpected DF of 16-17 can also be due to replacing SMZ into silica gel in the front end, due to unexpectedly high dose rate only after 5 hours of operation. Silica gel does not have good DF for oil removal since it is not porous material. A more common porous mineral material is parlite, although it does not seem to be a very good sober for oil contamination. Therefore I recommended to try “needle coke” as a candidate for removing oil contamination at the front end.
In addition, the announced DF represents just three gamma emitting species and do not cover all the nuclear species likely be included in the highly contaminated water. Some of them with large core inventory and mobility into the contaminated water are summarized in the attachment (Activity_Concentration_100d.doc) It appears that both Kurion as well as AREVA tailored the system only for cesium, technetium and iodine. I presume other important species are just pass through the process. For this point of view, I believe the Kurion’s last stage using Ag-impregnated herschelite need to be improved for sober with wider absorption capabilities. Although there exists such a sober exist (e.g. LHT), unfortunately the DF becomes very low in sea water. Therefore, it may necessary to add one more stage after desalination, to remove other radionuclides.
TEPCO also release a sampling result of the desalination process, indicatinga DF of 265 for chloride.

II. Recapping on a temporary level gauge for the Reactor Pressure Vessel.
I introduced this issue in Earthquake (1003). Today, TEPCO released that the temporary level gauge is still not functioning pr0perly, due to dry out of the “condensing pot” which provides the reference level presssure.
A graph is released as attached. The reference point is decreasing consistently below zero, which is unreasonable.
(In Japanese, http://www.tepco.co.jp/nu/fukushima-np/images/handouts_110625_02-j.pdf )
The newly installed level gauge also provided that the current reactor pressure vessel pressure is 12 kPa, slightly above the atmospheric pressure.

Well, let me stop here tonight!

Genn Saji
_______________________________________________________________________________________
(Previous e-mail sent at 10:01 PM on June 24 as Earthquake (105))
Dear Colleagues:

105th day!

I. Recapping on the water purification system
Very early this morning, it was reported that TEPCO will continue the current campaign using the real highly contaminated water, even when an high dose rate alarm exceeding 4.7 mSv/h is reached. When it became necessary to replace sober, the entire system will be flashed with low level contaminated water to reduce the worker doses. It is said to take approximately two hours for the flashing. In parallel with this, their optimization study continues so that one critical sorption tank will not prematurely come to its life.
They also disclosed the operational results (bar charts), as attached, showing that the initial problems are in the front end SMZ sober, which is currently replaced into silica gel in place of zeolite. This is reasonable since zeolite tends to catch cesium, resulting in early breakthrough even with low DF. I made a quick e-mail search looking for better oil removal sober material and came to a conclusion that so called “needle cokes” could be tested, although it is going to be a headache for ultimate disposal, if the material also adsorbs cesium. The needle cokes is a hydrophobic porous material actually used for removal of oil contamination by weaving into mats by NIPPO corporation. (In Japanese, http://www.nippo-c.co.jp/ourbuiss/plant/products/kyutarou.html ) I came to this conclusion by reading a recent paper by Serbian scientists BRANISLAV R. SIMONOVI? et al., REMOVAL OF MINERAL OIL AND WASTEWATER POLLUTANTS USING HARD COAL, in Chemical Industry & Chemical Engineering Quarterly 15 (2) 57-62 (2009).
TEPCO’s bar-chart also indicates that the breakthrough time for a cesium sober tank is approximately 33 hours. For commissioning, how to accomplish the periodical it is necessary to optimize procedure of replacement of sober materials with minimum worker doses as well as with highest throughput.
I think current TEPCO’s approach is reasonable and practical, in view of current urgent situation of continuation of the volume of the highly contaminated water increase by 400 tons a day, even not including rain water from the roof-less reactor buildings. By looking at the more detailed schematics, I noticed that basically each skid has 3 sorption tank in the US Kurion’s system. These three tanks are connected in series, composing one tall sorption column equivalent. The radiation monitor at each tank should be a good indicator for telling that the “breakthrough” reaching to the bottom of that tank. When the dose rate increased to a high level at the last stage, it will be the time to stop operation for maintenance. It appears that TEPCO people began to learn the system specific characteristics. So the real issue will be the accumulated worker doses during the next maintenance campaign, which I anticipate will become necessary in another few days. The “breakthrough” in the front end “oil removal and technetium” removal tanks as well as the last stage “iodine removal” tanks will also be a critical if one of them reached “breakthrough” prematurely. Whether to stop under this situation or not should be discussed before hand. Because of urgency of continue operation of the water purification system, I am on the side to continue as long as the cesium sorption tanks are working.
In parallel with this, TEPCO announced today that they will initiate the pre-commission test of the final 4th stage for desalination. This test has been flow tested during the flow test using low contamination liquor. The new campaign uses 3000 tons of water already processed through the pre-commissioning test of the first stage for oil and technetium removal, the second stage for Kurion’s cesium and iodine removal, and the third stage for AREVA’s co-deposition process for cesium removal.
Later TEPCO made an announcement that the targeted DF of 100,000 was achieved, by combing the Kurion’s process and AREVA’s process, although the formersystem is still under the projected DF. Since the final contamination level of the treated water is below 100 Bq/cm3, the final desalination system can now be tested.

II. Recapping on the personal dosimeters for every school children in Fukushima
I introduced this topic in Earthquake (102). The Fukushima Prefecture decided to distribute personal dosimeters, to record accumulated doses by using “glass badges”, to every school children, totaling to 280,000 pupils. This operation will be accomplished by creating an Urgent Program for Protection of Young Children. Pregnant mothers, estimated 20,000, will also be included. The project also includes remediation of school ground, installation of air conditioners. The remediation of school ground have already been completed, reducing the dose rate as low as to 0.5 microSv/hr. Even with this low level, schools and parents are prudent to limit usage of the school grounds, without knowing how low is low enough.
In view of the parents’ concern against radiological safety, the national government decided to allocate budget to monitor radiatiological health effects of entire residents of Fukushima Prefecture for coming 30 years, by creating a special funding organization with an endowment of ten billion yen (approximately 120million US dollars). This was first spearheaded by the Fukushima Prefecture, but in view of the national government responsibility of supporting nuclear energy, the national government is to take up this initiative. By first reviewing questionnaires, the people which might have received high radiation will be screened. In some cases, their internal exposure will also be measured. This is to respond increased anxiety among the residents as to the effect of low level radiation for long term, which may accumulate defects in DNA. The government intends to ask TEPCO to share more than twenty percent of the endowment.

III. Recapping the water injection rate and current decay heat
I introduced this issue on Earthquake (99). At news interview, TEPCO released the current water injection rates
Unit Water Injection rate (ton/h) RPV Temp. (at the feed water nozzle) RPV Temp. (at the lower part)
1F1 3.6 118.7 102.8
1F2 3.5 108.5 110.1
1F3 9.0-9.1 151.1 121.9
The decreased flow rates indicate that the decay heat has further went down.

Well, let me stop here tonight!

Genn Saji
- giugno 25, 2011 Nessun commento:
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Fukushima: day 105 & 106

Dear Colleagues:

106th day!

I. Recapping on the water purification system
Later last night, TEPCO made an announcement that the targeted DF of 100,000 was achieved, by combing the Kurion’s process and AREVA’s process, although the former system is still under the projected DF. They posted the results of sampling data of DF before and after the water treatment as below released on June 24:
Species Kurion’s process AREVA’s process Integrated
I-131 5.8 1.3 7.6
Cs-134 16 6700 1.1E+06
Cs-137 17 7200 1.2E+05
These results are strange, when compared with the sampling data released on June 22.
Species Kurion’s process AREVA’s process Integrated
I-131 7 1.1 7.8
Cs-134 41 >430 >2.0E+04 (limited by detection limit)
Cs-137 46 >480 >2.2E+04 (limited by detection limit)
TEPCO explained in June 23 that one bypass valve was inadvertently left open, feeding water from the top sorption vessel directly to the Ag-impregnated zeolite sorption line. By closing the valve, the DF decreased. The new sampling results seem to more pointing towards that the valve can be open as indicated by the hand-written marking, bypassing a portion of Skid 4. Also likely is the case that one of the cesium sorption skid has gone through “breakthrough.”
The most recent sampling results released June 25 are more discouraging:
Species Kurion’s process AREVA’s process Integrated
I-131 6.3 1.1 6.6
Cs-134 34 1800 6.3E+04
Cs-137 35 1800 6.3E+04
These results indicate that still further optimization, including finding better sober for SMZ tank. So far, 4500 tons of water has been purified.
The unexpected DF of 16-17 can also be due to replacing SMZ into silica gel in the front end, due to unexpectedly high dose rate only after 5 hours of operation. Silica gel does not have good DF for oil removal since it is not porous material. A more common porous mineral material is parlite, although it does not seem to be a very good sober for oil contamination. Therefore I recommended to try “needle coke” as a candidate for removing oil contamination at the front end.
In addition, the announced DF represents just three gamma emitting species and do not cover all the nuclear species likely be included in the highly contaminated water. Some of them with large core inventory and mobility into the contaminated water are summarized in the attachment (Activity_Concentration_100d.doc) It appears that both Kurion as well as AREVA tailored the system only for cesium, technetium and iodine. I presume other important species are just pass through the process. For this point of view, I believe the Kurion’s last stage using Ag-impregnated herschelite need to be improved for sober with wider absorption capabilities. Although there exists such a sober exist (e.g. LHT), unfortunately the DF becomes very low in sea water. Therefore, it may necessary to add one more stage after desalination, to remove other radionuclides.
TEPCO also release a sampling result of the desalination process, indicatinga DF of 265 for chloride.

II. Recapping on a temporary level gauge for the Reactor Pressure Vessel.
I introduced this issue in Earthquake (1003). Today, TEPCO released that the temporary level gauge is still not functioning pr0perly, due to dry out of the “condensing pot” which provides the reference level presssure.
A graph is released as attached. The reference point is decreasing consistently below zero, which is unreasonable.
(In Japanese, http://www.tepco.co.jp/nu/fukushima-np/images/handouts_110625_02-j.pdf )
The newly installed level gauge also provided that the current reactor pressure vessel pressure is 12 kPa, slightly above the atmospheric pressure.

Well, let me stop here tonight!

Genn Saji
_______________________________________________________________________________________
(Previous e-mail sent at 10:01 PM on June 24 as Earthquake (105))
Dear Colleagues:

105th day!

I. Recapping on the water purification system
Very early this morning, it was reported that TEPCO will continue the current campaign using the real highly contaminated water, even when an high dose rate alarm exceeding 4.7 mSv/h is reached. When it became necessary to replace sober, the entire system will be flashed with low level contaminated water to reduce the worker doses. It is said to take approximately two hours for the flashing. In parallel with this, their optimization study continues so that one critical sorption tank will not prematurely come to its life.
They also disclosed the operational results (bar charts), as attached, showing that the initial problems are in the front end SMZ sober, which is currently replaced into silica gel in place of zeolite. This is reasonable since zeolite tends to catch cesium, resulting in early breakthrough even with low DF. I made a quick e-mail search looking for better oil removal sober material and came to a conclusion that so called “needle cokes” could be tested, although it is going to be a headache for ultimate disposal, if the material also adsorbs cesium. The needle cokes is a hydrophobic porous material actually used for removal of oil contamination by weaving into mats by NIPPO corporation. (In Japanese, http://www.nippo-c.co.jp/ourbuiss/plant/products/kyutarou.html ) I came to this conclusion by reading a recent paper by Serbian scientists BRANISLAV R. SIMONOVI? et al., REMOVAL OF MINERAL OIL AND WASTEWATER POLLUTANTS USING HARD COAL, in Chemical Industry & Chemical Engineering Quarterly 15 (2) 57-62 (2009).
TEPCO’s bar-chart also indicates that the breakthrough time for a cesium sober tank is approximately 33 hours. For commissioning, how to accomplish the periodical it is necessary to optimize procedure of replacement of sober materials with minimum worker doses as well as with highest throughput.
I think current TEPCO’s approach is reasonable and practical, in view of current urgent situation of continuation of the volume of the highly contaminated water increase by 400 tons a day, even not including rain water from the roof-less reactor buildings. By looking at the more detailed schematics, I noticed that basically each skid has 3 sorption tank in the US Kurion’s system. These three tanks are connected in series, composing one tall sorption column equivalent. The radiation monitor at each tank should be a good indicator for telling that the “breakthrough” reaching to the bottom of that tank. When the dose rate increased to a high level at the last stage, it will be the time to stop operation for maintenance. It appears that TEPCO people began to learn the system specific characteristics. So the real issue will be the accumulated worker doses during the next maintenance campaign, which I anticipate will become necessary in another few days. The “breakthrough” in the front end “oil removal and technetium” removal tanks as well as the last stage “iodine removal” tanks will also be a critical if one of them reached “breakthrough” prematurely. Whether to stop under this situation or not should be discussed before hand. Because of urgency of continue operation of the water purification system, I am on the side to continue as long as the cesium sorption tanks are working.
In parallel with this, TEPCO announced today that they will initiate the pre-commission test of the final 4th stage for desalination. This test has been flow tested during the flow test using low contamination liquor. The new campaign uses 3000 tons of water already processed through the pre-commissioning test of the first stage for oil and technetium removal, the second stage for Kurion’s cesium and iodine removal, and the third stage for AREVA’s co-deposition process for cesium removal.
Later TEPCO made an announcement that the targeted DF of 100,000 was achieved, by combing the Kurion’s process and AREVA’s process, although the formersystem is still under the projected DF. Since the final contamination level of the treated water is below 100 Bq/cm3, the final desalination system can now be tested.

II. Recapping on the personal dosimeters for every school children in Fukushima
I introduced this topic in Earthquake (102). The Fukushima Prefecture decided to distribute personal dosimeters, to record accumulated doses by using “glass badges”, to every school children, totaling to 280,000 pupils. This operation will be accomplished by creating an Urgent Program for Protection of Young Children. Pregnant mothers, estimated 20,000, will also be included. The project also includes remediation of school ground, installation of air conditioners. The remediation of school ground have already been completed, reducing the dose rate as low as to 0.5 microSv/hr. Even with this low level, schools and parents are prudent to limit usage of the school grounds, without knowing how low is low enough.
In view of the parents’ concern against radiological safety, the national government decided to allocate budget to monitor radiatiological health effects of entire residents of Fukushima Prefecture for coming 30 years, by creating a special funding organization with an endowment of ten billion yen (approximately 120million US dollars). This was first spearheaded by the Fukushima Prefecture, but in view of the national government responsibility of supporting nuclear energy, the national government is to take up this initiative. By first reviewing questionnaires, the people which might have received high radiation will be screened. In some cases, their internal exposure will also be measured. This is to respond increased anxiety among the residents as to the effect of low level radiation for long term, which may accumulate defects in DNA. The government intends to ask TEPCO to share more than twenty percent of the endowment.

III. Recapping the water injection rate and current decay heat
I introduced this issue on Earthquake (99). At news interview, TEPCO released the current water injection rates
Unit Water Injection rate (ton/h) RPV Temp. (at the feed water nozzle) RPV Temp. (at the lower part)
1F1 3.6 118.7 102.8
1F2 3.5 108.5 110.1
1F3 9.0-9.1 151.1 121.9
The decreased flow rates indicate that the decay heat has further went down.

Well, let me stop here tonight!

Genn Saji
- giugno 25, 2011 Nessun commento:
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venerdì 24 giugno 2011

Dangerous radiation leaked from U.S. nuclear power plants

Dangerous radiation leaked from three-quarters of U.S. nuclear power plants

By Daily Mail Reporter, 21st June 2011

Dangerous radiation has leaked from three-quarters of all U.S. nuclear power stations raising fears the country's water supplies could one day be contaminated.

The number and severity of leaks has increased because of the many old and unsafe plants across America, a new investigation has claimed.

Radioactive tritium has escaped at least 48 of 65 of all U.S. sites, often entering water around the plants through rusty old pipes.

'Dangerous': Oyster Creek nuclear plant in New Jersey is sometimes called 'Oyster Creak' by some critics because of its old age and because it had a tritium leak last year

'Dangerous': Oyster Creek nuclear plant in New Jersey is sometimes called 'Oyster Creak' by some critics because of its old age and because it had a tritium leak last year

Water tested around 37 of the facilities contained radioactive concentrations exceeding the U.S. drinking water standard and in some cases at hundreds of times over the limit.

One serious case was uncovered at the Braidwood Nuclear Power Station in Illinois, which has leaked more than six million gallons of tritium-laden water in repeated leaks dating back to the 1990s.

Scientists says tritium is not dangerous in small doses but prolonged exposure to high levels is believed to increase the chances of cancer, leukaemia, and mutations in humans.

Contaminated: High levels of dangerous tritium are thought to leave the plants via rusted and degraded pipes like this at the now closed Indian Point 1 nuclear plant in New York state

Contaminated: High levels of dangerous tritium are thought to leave the plants via rusted and degraded pipes like this at the now closed Indian Point 1 nuclear plant in New York state

Perilous: This 2007 leak at the Byron nuclear plant in Illinois was allowing 10 gallons of water per minute to pour out raising fears that water supplies would be contaminated by radioactive material

Perilous: This 2007 leak at the Byron nuclear plant in Illinois was allowing 10 gallons of water per minute to pour out raising fears that water supplies would be contaminated by radioactive material

The leaks have been uncovered by a year-long Associated Press investigation found by trawling the U.S. Nuclear Regulatory Commission (NRC) records.

Despite the revelations the NRC and industry bosses consider the leaks a public relations problem, not a public health threat.

'The public health and safety impact of this is next to zero,' said Tony Pietrangelo, chief nuclear officer of the industry's Nuclear Energy Institute.

'This is a public confidence issue.'

Flaky safety record: Paint is shown peeling off a wall at the Oconee nuclear plant in South Carolina

Flaky safety record: Paint is shown peeling off a wall at the Oconee nuclear plant in South Carolina

While most leaks have been found within plant boundaries, some have migrated off site

At three sites — two in Illinois and one in Minnesota — leaks have contaminated drinking wells of nearby homes, official records show, but not at levels violating the drinking water standards.

At a fourth site, in New Jersey, tritium has leaked into an aquifer and a discharge canal feeding picturesque Barnegat Bay off the Atlantic Ocean.

It is claimed regulators and industry have weakened safety standards for decades to keep the nation's commercial nuclear reactors operating within the rules.

Even if there was a major leak, the U.S. Government says The U.S. Environmental Protection Agency says seven of 200,000 people who highly contaminated water for decades would develop cancer.


Read more: http://www.dailymail.co.uk/news/article-2006250/Dangerous-radiation-leaked-quarters-U-S-nuclear-power-plants.html#ixzz1QBg6MdKo
- giugno 24, 2011 1 commento:
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giovedì 23 giugno 2011

Fukushima: day 103 & 104

Dear Colleagues:

104th day!

I. Recapping on the water purification system
TEPCO seems to be puzzled with an unexpected rise in dose rate in the sorption tanks in the down streams. They were anticipating that most of the cesium is going to be absorbed in the up stream tanks. Before starting the test using the real liquor, the dose rate of the down stream tanks were 3 mSv/h, which jumped to 15 mSv/h. TEPCO now suspects that there should be some flow distribution anomaly in the process.
This morning, TEPCO made a press release by showing a bit more detailed schematics as attached
( in Japanese, http://www.tepco.co.jp/nu/fukushima-np/images/handouts_110623_01-j.pdf )
and explained that one bypass valve was inadvertently left open, feeding water from the top sorption vessel directly to the Ag-impregnated zeolite sorption line. The schematics is showing that there are 4 parallel molecular sieve sorption skids. Each skids contains 4 sorption tower in series. Their announcement indicates that the top vessel of Skid 4 has already completed its life through “break though” in just one day. In another few days, an entire replacement of the sober, as many as 20, is going to be necessary. Whether such maintenance can be performed without remote maintenance is my persistent concern.

Well, let me stop here tonight! The news about Fukushima Daiichi were very limited today, by some unknown reason.

Genn Saji

____________________________________________________________________________________
(Previous e-mail sent at 10:11 PM on June 20 as Earthquake (103))
Dear Colleagues:

103rd day!

I. Recapping on the water purification system
Since this is the most urgent issue, I have to start with this topic.
After readjusting the flow rate of the “coagulation and settling” tank in the AREVA’s system, TEPCO resumed pre-service operation at around 12:30 PM yesterday and kept running until 10:00 AM today, June 22, for replacement of, perhaps, sober from tanks. During this campaign, as much as 1800 tons of highly contaminated water has been purified by extracting water from the Centralized Waste Treatment Facility, whose water level dropped down by 40 cm.
Since some room has now became available, TEPCO started to transfer similar highly contaminated water from the basement of the 1F3 turbine hall. This operation resulted in terminating the consistent increase in the water level in the pit, which has reached only 12 cm from the ground level. The situation continued to be critical, since the Fukushima district now went into a rainy season yesterday. During June 23-24, a heavy rainfall is forecasted in Fukushima. The rainwater may accumulate in the roof-less reactor buildings, further increasing the total volume of the highly contaminated water estimated as much as 110,000 tons total.
However, the most recent data released tonight as attached showed DF of only 46 for both Cs-137 and Cs-134 and 7 for I-131 in the Kurion’s molecular sieve sorption stage, although DF was approximately 3000 when using the low level liquor. In the AREVA’s co-deposition stage, DF was better than around 500 for cesium, the upper boundary was limited by the detection limit. This phenomena is well known in chemical engineering called “breakthrough” in column dynamics, where the sorption reaction starts from the top surface, gradually going deeper until the original liquor just pass through without being absorbed. Obviously, the sorption column was used too long a time. I made a quick internet search and found the following website. http://www.separationprocesses.com/Adsorption/AD_Chp02c.htm The US Kurion may have a breakthrough curve for their molecular sieve sober, if not TEPCO should do a quick experiment by detecting the breakthrough by putting a dose monitoring system at the outlet of the sorption column. The 4 mSv dose alarm may have indicated the occurrence of breakthrough. If it occurred in just 5 hours, the sorption process will not work for this kind of highly contaminated water. As long as the final concentration of the water at the outlet of the AREVA’s system is ND, just resume the operation by skipping the Kurion process.
In order to reduce the volume of the highly contaminated water, TEPCO reduced the water injection rates to 4.5 m3/h for 1F1 and 2, 10 m3 for 1F3. Since the response of 1F1 and 1F2 are slight, they further reduced to 4.0 m3/h. However, in 1F3, the flow rate reduction of just 1 m3/h immediately resulted in a temperature increase of 4 degreeC at the water supply nozzle location to 149 degreeC and 7 degreeC at the bottom part to 138 degreeC. TEPCO continue monitoring the trends of these plants. The behavior of 1F3 is different from 1F1 and 2, perhaps indicating a difference in the core status or damage in the primary coolant boundary. In addition, the amount of the flow injection rate is several times more than necessary to remove decay heat, indicating a gross leakage.
I am continued to be concerned with the doses received by the workers for replacement of sober of the the front end SMZ sorption line. As I estimated, the sober needs to be renewed manually every day, not just once a month TEPCO seems to have been projecting. Whether this kind of high dose work can be continued is a big question. At least some temporary shielding should be applied, especially in the pipes running near workers.
Another recommendation is optimization of activation level of water in the the Centralized Waste Treatment Facility during the transfer process. In my understanding, the activation level of the 1F2 turbine hall water is an order of magnitude higher. This should be diluted with lower activated water from other buildings.

II. Dose maps and observation of highly contaminated water in 1F2
TEPCO released the dose measurement results as well as some pictures taken inside of the 1F2 Reactor Building by their 7 staffs and 3 industry supporting engineers on June 21 for just ten minutes. The planned dose accumulation was 6 mSv, whereas the actual doses ranged from 2.16-5.52 mSv. The results are shown in the attached following hand out in Japanese.
http://www.tepco.co.jp/nu/fukushima-np/images/handouts_110622_01-j.pdf
Please note a picture taken at SE corridor, where the dose rate is as high as 388 mSv/h, showing a dark brownish color in the water. Although some Japanese media report that it is an evidence of water contamination by corium, I do not believe it. The color looks like showing heavy contamination with hematite (Fe2O3). In BWR, it used to have heavy deposits of hematite on the surface of fuels, due to an cathodic potential induced by radiation, however, the hematite crud deposition was said to have been much reduced in recent years by introducing better water treatment systems (total desalination) in the primary water. Where this much of hematite has been deposited and was released to the highly contaminated water is a good scientific question. This situation is much different from 1F1 and 1F3, whose water color was more slight yellowish. I guess it is likely came from the re-circulation lines, where IGSCC has been reported many times in BWRs of this generation. This may indicate a location of crack in the primary coolant boundary.
Also, in 1F2, TEPCO plans to install a temporary level gauge for the Reactor Pressure Vessel.
http://www.tepco.co.jp/nu/fukushima-np/images/handouts_110622_02-j.pdf
TEPCO seems to admit that the instrumentation using Bourdon gauge type went out after “internal hydrogen explosion” I have been suggesting in the light of the Hamaoka Unit 1 hydrogen explosion/pipe rupture accident. This will affect pressure gauges, level gauges as well as flow gauges.

Well, let me stop here tonight!

Genn Saji
- giugno 23, 2011 Nessun commento:
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Nucléaire: incidents en série en France

Nucléaire: incidents en série à la centrale de Paluel

  • Enquête
  • Prolonger
Le Journal, 22 juin 2011 | Par Jade Lindgaard et Michel de Pracontal

Fuites à répétition, rejets de gaz radioactif, déclenchements de balises d'alertes, contaminations de travailleurs : depuis plus d'un mois, l'une des plus grosses centrales nucléaires françaises, le site de Paluel, en Haute-Normandie, connaît des dysfonctionnements en série. La multiplication des incidents crée un vent de panique chez les agents qui y travaillent, selon des témoignages et des documents exclusifs recueillis par Mediapart. La centrale de Paluel produit, à elle seule, environ 7% de l'électricité nationale.

L'inquiétude collective commence à se manifester sur Internet : «Centrale de Paluel : EDF sur les traces de Tepco ?» Cette formule provocatrice, qui compare l'électricien français à l'exploitant de la centrale de Fukushima, n'émane pas d'un groupe antinucléaire. Elle figure en tête d'un communiqué de la CGT de la région dieppoise (à lire ici), où se trouve la centrale de Paluel.

Avec quatre réacteurs de 1300 mégawatts (MW), ce site qui emploie 1250 salariés d'EDF est l'une des trois plus importantes centrales nucléaires françaises (avec celles de Gravelines et de Cattenom). Mis en service entre décembre 1985 et juin 1986, le site de Paluel n'a pas posé de problème particulier pendant les deux premières décennies de son fonctionnement.

La centrale de Paluel (photo EDF).
La centrale de Paluel (photo EDF).

Mais depuis quelque temps, divers problèmes techniques se sont accumulés sur le réacteur n°3, que l'un de nos interlocuteurs qualifie de «tranche la plus poissarde du site» : une fuite d'huile sur l'alternateur, une fuite d'eau du circuit primaire, une fuite de gaz radioactif dans le bâtiment réacteur, ainsi qu'une fuite dans une ou plusieurs gaines de combustible.

Jusqu'ici occultés, ces dysfonctionnements ne sont pas contestés par la direction de la centrale. Mais l'interprétation de leur gravité diverge radicalement d'une source à l'autre. Tous s'accordent cependant à décrire une inquiétude grandissante chez les agents et, pour certains, de l'angoisse et de la panique. L'un de nos interlocuteurs parle même de «terreur étouffée»!

Il raconte qu'un bâtiment proche du réacteur a dû être évacué plusieurs fois à cause du déclenchement de l'alarme mesurant la présence de gaz nocifs dans l'air. Des salariés «ont forcé des coffrets contenant des pastilles d'iode» pour se prémunir contre une éventuelle contamination. Cette réaction révèle un niveau élevé de stress chez des personnels pourtant formés à travailler dans le contexte particulier des installations nucléaires. Inquiétude nourrie par le fait que «l'alarme se déclenchait tout le temps», selon une autre source. Si bien que les seuils de détection de ces rejets gazeux ont fini par être relevés pour obtenir le silence.

«Le xénon, c'est comme une cigarette»

Pour remédier à certaines des fuites, le réacteur n°3 de Paluel a fait l'objet d'un arrêt lors du week-end de la Pentecôte. Un «arrêt à chaud» dans lequel le réacteur tourne au ralenti sans être complètement arrêté. Seize agents EDF et sous-traitants ont accidentellement inhalé du xénon, un gaz radioactif, lors de cette intervention. Ils ont été contaminés : des traces de ce gaz rare ont été trouvées à l'intérieur de leur organisme.

L'un d'entre eux explique à Mediapart avoir travaillé sans porter la cagoule et la bouteille d'oxygène permettant de ne pas respirer l'air environnant. «La réserve de l'appareil respiratoire individuel est trop limitée par rapport au temps d'intervention, cela nous aurait obligé à entrer et sortir plusieurs fois du bâtiment, ce qui aurait prolongé le temps d'intervention», ajoute-t-il, sous le sceau de l'anonymat.

Faux, conteste Claire Delebarre, chargée en communication de la centrale de Paluel : «Ils n'ont pas porté leur appareil respiratoire car ils n'en avaient pas besoin.» Et d'ajouter : «Il ne s'agit pas de contaminations internes car le xénon ne se fixe pas dans l'organisme, il est rejeté au bout de quelques expirations, c'est comme une cigarette.»

La quantité de gaz inhalé par ces agents est minime et sans danger, assure un militant CGT de la centrale qui a étudié le cas de ces personnes. «C'est en dessous des seuils acceptables reconnus par l'Autorité de sûreté du nucléaire», confirme le salarié contaminé. Mais «seize personnes contaminées, c'est énorme!» commente un autre agent. Et cela prouve, d'après lui, la présence d'une grande quantité de gaz radioactif dans la salle où ont travaillé les volontaires de la Pentecôte. L'un des travailleurs pressentis aurait refusé de participer à l'intervention, jugeant les conditions trop peu sûres.

Schéma de principe d'un réacteur nucléaire du parc français
Schéma de principe d'un réacteur nucléaire du parc français

Le 21 juin, l'incident de la Pentecôte n'avait pas été signalé par l'Autorité de sûreté du nucléaire (ASN) sur son site internet. Au demeurant, il ne lui a même pas été notifié. «C'est normal, ce n'est pas un événement, on est dans le ressenti», répond le service communication de la centrale. «Les faits sont dissimulés», veut croire un agent de Paluel. Au local d'un syndicat de la centrale, contacté par téléphone, la première réaction est lapidaire : «Seize contaminations ? Mais c'est un roman que vous écrivez !»

Il ne s'agit pas d'une fiction, mais bien de la réalité. Qui plus est, l'intervention de la Pentecôte n'a résolu qu'une partie du problème : la fuite gazeuse est aujourd'hui réparée, mais l'eau du circuit primaire, elle, s'échappe toujours. La réparation est reportée. Les ennuis de l'alternateur avaient été traités précédemment. Mais il reste la fuite qui affecte une ou plusieurs gaines de combustible. Là, pas de réparation possible : il faut arrêter le réacteur et remplacer les éléments de combustible défaillants. Or, cela ne se fera qu'au prochain arrêt de tranche programmé, dans environ un an.

De toutes les difficultés qui affectent Paluel, la plus inquiétante est la défectuosité de certaines gaines de combustible, estime l'une de nos sources. Pourquoi ? Parce que ces gaines en alliage métallique constituent la première des barrières qui isolent la matière radioactive de l'environnement extérieur. Elles ont la forme de longs cylindres dans lesquels sont empilées de petites pastilles d'uranium radioactif. Ces «crayons» sont réunis en «assemblages» qui forment le cœur du réacteur.

«C'est comme du vin, parfois, il est bouchonné»

Le réacteur est une sorte de chaudière : les réactions nucléaires qui se produisent dans le combustible radioactif font chauffer l'eau du circuit primaire, qui à son tour transfère sa chaleur au circuit secondaire ; l'eau du circuit secondaire est vaporisée et la vapeur fait tourner la turbine qui produit l'électricité.

Le combustible radioactif, contrairement au charbon d'une chaudière classique, ne doit jamais être en contact avec l'environnement extérieur. A cette fin, les autorités nucléaires françaises ont élaboré une «doctrine de la sûreté» dont un principe de base consiste à enfermer la matière radioactive derrière trois «barrières»: d'abord la gaine du combustible ; ensuite la cuve et le circuit primaire ; enfin, l'enceinte de confinement du réacteur.

Les trois barrières de protection du combustible radioactif.
Les trois barrières de protection du combustible radioactif.

Or, à la centrale de Paluel, il est avéré, par les témoignages que nous avons recueillis et les documents que nous avons pu consulter, qu'au moins un assemblage du cœur de la tranche 3 contient un ou plusieurs crayons défectueux. Autrement dit, dont la gaine est fissurée. Comme il y a toujours une fuite dans le circuit primaire, cela signifie que deux des trois fameuses barrières ne sont plus étanches. Le ou les assemblages en cause sont neufs et ont été placés dans le cœur lors du dernier rechargement, survenu en mars 2011. D'après la direction de la centrale, les éléments concernés ont été fabriqués par Westinghouse.

«On est en train de pourrir tout le bâtiment réacteur !» s'inquiète un agent, qui considère que la fuite actuelle de combustible à Paluel «peut basculer sur des phénomènes incontrôlables». Or EDF a pour l'instant décidé de laisser tourner le réacteur en l'état, potentiellement jusqu'à la fin du cycle (autrement dit le prochain arrêt pour rechargement du combustible), dans un an environ. «Je ne comprends pas qu'on ne décide pas d'arrêter», insiste l'une de nos sources.

«Ce sont des micro-fuites, elles n'ont pas de conséquences directes sur le personnel : elles sont mesurées, analysées, contrôlées, maîtrisées», explique un militant de la CGT de Paluel. «Nos investigations indiquent qu'il y a un défaut de gainage, mais ce n'est pas une rupture, c'est légèrement poreux, et cela ne concerne qu'un seul assemblage», assure Claire Delebarre, la chargée de la communication de la centrale de Paluel. Rappelons qu'un assemblage contient 264 crayons, soit 264 possibles sources de fuite. Mais «fonctionner avec une légère fuite, ce n'est pas grave en soi. C'est comme du vin, parfois, il est bouchonné !» assure la communicante du site de Paluel.

La radioactivité occasionnée par la fuite est estimée à 30.000 MBq/t (mégabecquerels par tonne d'eau), sachant qu'à partir de 100.000 Mbq/t par jour pendant sept jours consécutifs, un réacteur doit impérativement être mis à l'arrêt. Les problèmes techniques de Paluel révèlent ainsi le secret le mieux caché au grand public mais le plus connu du monde du nucléaire : en contradiction flagrante avec la doctrine de sûreté martelée par l'autorité de sûreté, des centrales fuient, et en toute légalité !

«Des fuites, il y en a, c'est normal, ce sont des incidents d'exploitation tout à fait classiques», poursuit Claire Delebarre. Sollicitée par Mediapart, l'ASN ne nous a pas répondu à l'heure où nous mettons en ligne cet article.

«Les fuites, c'est normal»

«Les fuites, c'est normal, il y en a toujours eu dans le nucléaire», explique un spécialiste de la radioprotection. C'est si vrai que Mediapart a pu reconstituer un long historique des fuites de gaines de combustibles dans les centrales françaises. Une chronologie qui ne date pas d'hier puisqu'elle remonte à... il y a douze ans.

Le premier événement date d'octobre 1999 : à la centrale de Cattenom, en Lorraine, on détecte un taux élevé de radioactivité sur le circuit primaire et la présence de xénon 133. En août 2000, des mesures révèlent la dissémination de combustible dans le circuit primaire, et en septembre, de l'activité alpha qui témoigne d'une rupture de gaine sérieuse. Le 15 mars 2001, EDF découvre 28 assemblages de combustibles présentant des défauts d'étanchéité. L'incident est classé au niveau 1.

Après Cattenom, des pertes d'étanchéité de crayons de combustible ont affecté la centrale de Nogent-sur-Seine, à 50 km de Troyes. Cette fois, le problème était lié à un élément nouveau : les crayons défectueux étaient fabriqués dans un nouvel alliage au zirconium appelé «M5», différent du zircaloy 4 utilisé habituellement. L'alliage M5, produit par Areva, a été introduit par EDF afin d'améliorer la rentabilité du combustible : il s'agit d'augmenter le «taux de combustion», ce qui permet de réduire le nombre d'arrêts pour rechargement du cœur.

Mais ce M5 entraîne une complication imprévue : le taux de défaillances des crayons est, d'après une étude de l'IRSN (Institut de radioprotection et de sûreté nucléaire), «quatre à cinq fois supérieur à celui des crayons à gainage en zircaloy 4». En 2002, le premier cycle réalisé avec une recharge complète de M5 dans un réacteur, la tranche 2 de Nogent, «a dû être arrêté suite à une contamination du circuit primaire après un record de 39 ruptures de gaines sur 23 assemblages», d'après une étude du cabinet indépendant Global Chance (Cahiers de Global Chance, n°25, septembre 2008).

Exemples de fissures de gaines observées à Cattenom (Photo DSIN).
Exemples de fissures de gaines observées à Cattenom (Photo DSIN).

Au total, entre 2001 et 2008, une trentaine de fuites d'assemblages de combustible en alliage M5 ont été détectées, d'après l'IRSN. En 2006, l'ASN a estimé qu'il était nécessaire «d'adopter une démarche prudente» quant à l'introduction du M5. EDF a fait des efforts pour améliorer la fabrication des assemblages et éliminer les défauts, mais ils n'ont pas disparu.

En 2008, selon l'IRSN, «du combustible à gainage en alliage M5 (était) présent dans 17 des réacteurs de 900 MW, trois réacteurs de 1300 MW et les quatre réacteurs de 1450 MW», ce qui représente environ la moitié du parc. Depuis, le déploiement de l'alliage M5 s'est poursuivi et en particulier, il est présent dans les nouveaux assemblages de Paluel (voir l'onglet Prolonger).

«Les liquidateurs de tous les jours»

En fait, dès 2006, les gaines de combustibles ont connu des défaillances à Paluel. Cette année-là, un arrêt de tranche se prépare sur le réacteur n°4. Les agents sont prévenus qu'il risque d'être «dosant», c'est-à-dire de les exposer à de fortes doses de rayonnements ionisants. «L'indice de radioactivité de la tranche était 50 fois supérieur à celui de la tranche d'à côté», se souvient Philippe Billard, alors décontaminateur du site, et militant CGT.

Ce haut niveau d'activité l'inquiète. Il dépose un droit d'alerte et s'affronte au staff EDF de la radioprotection qui lui reproche d'exagérer. L'intervention est maintenue. Lors d'une opération de décontamination du matériel, des salariés de Framatome – l'ancien nom d'Areva – expertisent l'état du combustible à l'aide d'une caméra placée sous l'eau : «J'ai vu les films, j'ai vu les gaines de combustible : sur 15 cm, il y avait plus rien, raconte Philippe Billard. La gaine était ouverte, il y avait une fente, et derrière, il n'y avait plus rien. Les pastilles de combustible avaient dégagé. Elles étaient passées dans le circuit primaire.»

Au cours de cet arrêt de tranche de 30 jours, certains agents reçoivent la moitié de la dose annuelle autorisée de radioactivité. Parmi eux, un agent de conduite EDF a fait examiner ses selles. Mediapart a eu accès au résultat de son examen médical (voir ci-dessous) : son organisme recèle des traces de césium, d'uranium et de plutonium. Tous cancérigènes à partir d'une certaine dose.

Traces d'uranium dans le résultat d'analyse médicale de l'agent contaminé.
Traces d'uranium dans le résultat d'analyse médicale de l'agent contaminé.

Traces de plutonium dans le résultat d'analyse médicale de l'agent contaminé
Traces de plutonium dans le résultat d'analyse médicale de l'agent contaminé

«Il avait avalé des poussières radioactives», explique Philippe Billard. Des microdoses, chaque fois en dessous des normes, qui ne s'en accumulent pas moins dans l'organisme. Le syndicaliste adresse alors un courrier à la direction de la centrale (voir ci-dessous) pour l'alerter sur la présence de rayonnement alpha, très dangereux pour la santé, sur la tranche n°4. L'homme contaminé a depuis quitté le nucléaire.

Courrier d'alerte de 2006 sur les rayonnements alpha
Courrier d'alerte de 2006 sur les rayonnements alpha

Philippe Billard, lui, a fondé une association, «Santé-sous-traitance». Pour défendre la santé des sous-traitants qui représentent aujourd'hui environ la moitié des travailleurs du nucléaire. «La peur aujourd'hui de la population dans un accident nucléaire, c'est d'être contaminée et d'attraper un cancer. Eh bien nous, nous sommes contaminés régulièrement dans les centrales. Et on attrape des cancers. L'accident est déjà arrivé chez nous. Nous sommes les liquidateurs de tous les jours.»

Des liquidateurs en France ? Ne nous a-t-on pas dit et répété que la catastrophe, c'était pour les autres, ceux qui n'appliquent pas nos principes de sûreté, qui n'ont pas la chance de posséder notre organisation d'expertise et notre autorité nucléaire «indépendante»?

Ni franchement catastrophique ni vraiment rassurante, la situation de Paluel illustre au quotidien le fait que le système est vulnérable. Qu'il fonctionne avec des défaillances permanentes techniques et humaines, qui alimentent un climat général de méfiance, sinon de paranoïa. Que les grands principes de la sûreté ne sont pas respectés dans la dure réalité. Que la course à la productivité tend à prendre le pas sur l'exigence de sécurité. Et que la multiplication des contraintes à respecter pour que ce système continue à fonctionner le rend de plus en plus inhumain.

  • France
  • Nucléaire risque radioactivité contamination EDF Paluel
  • Enquête

Au départ de cette enquête, il y a eu l'envoi de plusieurs documents confidentiels sur le site Frenchleaks, il y a plusieurs semaines. Ces documents seront rendus accessibles quand Mediapart en aura achevé l'exploitation. La source de ces documents comme la quasi-totalité de nos interlocuteurs ont exigé l'anonymat afin de protéger leur emploi. Tout en respectant cette règle, nous avons pu avoir de longues conversations avec plusieurs sources. Nous avons aussi pu corroborer leurs affirmations par la consultation de nombreux documents. Certaines de ces pièces risquant de trahir nos informateurs, nous ne les avons pas citées explicitement. En tout état de cause, l'essentiel des faits relatés dans cette enquête nous a été confirmé par EDF mardi soir, veille de cette publication.

- giugno 23, 2011 Nessun commento:
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Michio Kaku on CNN: Fukushima - "They Lied to Us"

Michio Kaku on CNN: Fukushima - "They Lied to Us" - June 21, 2011
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In Hanford saga, no resolution in sight

In Hanford saga, no resolution in sight

Two decades after it began, there's no end in sight to legal wrangling over the Hanford Nuclear Reservation. Is this how litigation is supposed to work?

Jenna Greene All Articles

The National Law Journal

June 20, 2011

Senior reporter Jenna Grenne discusses the impact of the Hanford case.

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Plaintiff Carole Means

Plaintiff Carole Means
Photo: J. Craig Sweat

Eymann Allison's Richard Eymann

Eymann Allison's Richard Eymann
Photo: J. Craig Sweat

In some ways, Carole Means' teenage years on a farm in southeastern Wash­ing­ton state in the 1950s sound so wholesome, almost idyllic. She ate homegrown fruit and vegetables, fish from the nearby Columbia River, and drank milk from the family cows that grazed along its banks.

The farm commanded a view across the river of the Hanford Nuclear Reservation, the world's first full-scale plutonium reactor. Hanford produced most of the material for the U.S. arsenal of nuclear bombs, including the one dropped on Nagasaki, Japan, in 1945. For local residents, the plant was a source of pride — their unique contribution to winning World War II — and of jobs, employing 50,000 people at its peak.

It was also catastrophically toxic. Starting in 1944, the plant silently released huge amounts of radiation into the air, water and soil — sometimes intentionally, the government now admits.

Before Fukushima or Chernobyl or Three Mile Island, there was Hanford. The 586-square-mile site, today decommissioned, desolate and guarded by soldiers in camouflage, remains profoundly contaminated. The multibillion-dollar cleanup won't be completed until 2047 — 60 years after plutonium production ceased.

As for people like Means who lived in the surrounding communities — the downwinders — they were unaware of the radiation releases for 40 years.

As the scale of the contamination became known, some refused to believe it could be true. Others were shocked — and angry. When plaintiffs' lawyers from as far away as Pennsylvania began recruiting clients in the late 1980s, more than 5,000 signed on to sue the government contractors that ran the plant, alleging that the radiation releases caused cancer and other illnesses.

This is not a story, however, about a group of victims who triumphed against the government. After 21 years of litigation, only a few downwinders have received compensation. The case remains bogged down in motions and competing expert studies, and prospects for the remaining 1,500 plaintiffs to receive any money in their lifetimes are dicey.

Part of the problem is the case's unwieldy size and high stakes. But blame for the costs and delays also falls on the lawyers and judges themselves, who over the years — a review of hundreds of pages of court records shows — have made errors in strategy and judgment, staking out positions that leave little room for compromise.

On one side are the defense lawyers, who have billed the government more than $50 million but say most of the plaintiffs don't deserve anything because they can't prove their illnesses were caused by Hanford radiation. "We're not going to throw taxpayer money at baseless claims," said lead counsel Kevin Van Wart, a partner at Kirkland & Ellis in Chicago.

The plaintiffs' lawyers handling the case on contingency have spent nearly $10 million on litigation expenses — never mind thousands of hours of as-yet unpaid work. At this point, they can't afford anything less than a massive payout from the government if they hope to break even.

Settlement offers by the U.S. Depart­ment of Energy to date — $10,000 for a case of thyroid cancer, for example — are insulting, they say.

As for the judges, the first was forced to recuse himself midway through the case due to a conflict of interest. The second has only recently taken steps to speed up the proceedings to allow some plaintiffs a day in court.

In the meantime, the downwinders are getting older and sicker — and dying empty-handed. "I've resigned myself to the fact that this is never going to be resolved in my lifetime. It just grinds on year after year after year," said Means, who is 71. "I have three children, and I hope it results in something for them."

Diagnosed with chronic fatigue syndrome and thyroid disease, she has felt sick — flulike, achy and tired — for most of her life. The only consolation to learning about what happened at the plant is that she felt her condition was finally explained. "I have classic radiation symptoms," she said. "It was like a light went off in my head. 'Is that what's been going on?' "

Now she sits alone on a wooden bench outside a ninth-floor federal courtroom in Spokane. She's the first to arrive for a status conference before U.S. District Senior Judge William Fremming Nielsen. She and about a dozen other plaintiffs have come to observe the proceedings (routine as they may be), a reminder to the lawyers and the judge that they are here and they are waiting. "They radiated the whole place," she said, her pale blue eyes welling with tears. "To think that your country would do that to a person and deny any wrongdoing."

PRIVATE CONTRACTORS

Hanford is about 170 miles southwest of Spokane, in a remote desert scrub landscape of hills and tumbleweed. The nearest town is Richland, where local businesses have names like Atomic Auto Body and Atomic Bowl, and the high school mascot is the Bombers. The Army Corps of Engineers' Manhattan Project, racing to develop a nuclear weapon during World War II, picked the Hanford site in 1943 in large part for its proximity to the Columbia River, since water was necessary to cool the reactor cores.

The government knew it didn't have the expertise to run the plant itself, so it recruited E.I. du Pont de Nemours and Co. The company initially refused. Only after the government insisted that the project was of utmost importance to the war effort did DuPont agree out of "patriotic considerations." The company accepted one dollar as payment for its services, according to court papers.

In September 1944, Hanford began making plutonium, and continued to do so for the next 40 years.

DuPont soon transferred its duties to General Electric Co., which ran Hanford through the end of the Cold War and also agreed to earn no profit for its work.

The contractors may not have made money off Hanford, but they weren't going to lose any, either. As part of the agreements to run the plant, the government indemnified them from all liability. Contractor immunity was later incorporated into the federal law that covers nuclear accidents, the Price-Anderson Act. That's why, although GE and DuPont, not the United States, are named as defendants in the suit, the government is on the hook for damages. It's also why the companies got to hire their own lawyers, again paid for by the government. Kirkland & Ellis, originally retained by DuPont, is the only one still remaining. Neither DuPont nor GE is actively involved in the day-to-day litigation, which is managed by the general counsel's office in the Department of Energy.

Kirkland has been paid $21.4 million in fees and $2.7 million in expenses by the government for its work from 1990 until the end of 2010, according to Van Wart.

To lead plaintiffs' counsel Louise Roselle, a partner at Cincinnati's Waite, Schneider, Bayless & Chesley, this arrangement is one reason why the case hasn't settled. "When the U.S. government is paying the bills, you lose a huge check and balance," she said. "A company looks at what the litigation is costing, and makes a cost/benefit decision. The government doesn't seem to care."

There's also the attitude — what Roselle and other plaintiffs' lawyers have called a "scorched earth defense." Kirkland lawyers have a reputation for being tenacious and aggressive litigators, and Van Wart is no exception. It's an approach that plaintiffs complain is at odds with the Price-Anderson Act's mandate for the government to "provide for full and prompt compensation of all valid claims" from nuclear incidents.

The environmental contamination at Hanford began almost immediately after the plant opened in 1944. Until 1948, there were no filters on the smokestacks. Radioactive gases and particles flew straight up the stacks and into the air.

Many of the substances were released in small quantities or became nonradioactive very quickly, but not iodine-131, which is produced by the fission of uranium atoms.

In 1945 alone, the plant released an estimated 555,000 curies of radioactive iodine, compared with 15 curies during the Three Mile Island accident in Pennsylvania in 1979. (A curie is the number of atoms that decay each second. One curie is 37 billion atoms.)

People as far away as Idaho and Oregon were exposed to iodine-131 by eating contaminated fruit and vegetables, breathing contaminated air and drinking contaminated milk. One of them was Jay Mullen, a plaintiff in the case. From 1944 to 1945, when he was 4 years old, he lived with his family at the Farragut Naval Training Station in Idaho, 225 miles northeast of Hanford. Farragut lay on the outer reaches of the fallout area, but Mullen drank milk — big glasses of it at daycare on the base, where you couldn't leave the table unless you'd finished every drop.

Cows can be highly effective transmitters of radioactive iodine. When radioactive material falls on pasture grass eaten by cows, it passes into the cow's milk. Once in the human body, iodine-131 concentrates in the thyroid gland, where it can eventually cause thyroid disease and cancer. Because children's thyroids are smaller, they absorb proportionately more iodine-131 and the harm is much greater.

Fourteen years later, Mullen, by then a college athlete at the University of Oregon, woke up one morning and couldn't move. "They concluded I had thyroid-induced paralysis," he said. "I was told I was a medical freak. They couldn't explain it."

Today, there's no doubt in his mind that his condition was caused by radiation from the plant, ingested via local milk. His thyroid was removed, and he recovered — but he still has a scar at the base of his throat that he calls his "Hanford necklace," and he's had to take thyroid medication every day for the past 50 years.

The most egregious release of radiation, the "green run," came in December 1949. A few months earlier, the Soviet Union detonated its first atomic bomb, and the Air Force wanted to find out how an airborne release of radioactive materials would spread — data that could be used to monitor Russian nuclear weapons programs, according to a 1992 government-funded report.

Hanford scientists intentionally released about 7,800 curies of iodine-131 over 12 hours, according to the report. No one in the community was informed, though plant operators had some inkling the substance was harmful, since the scientists who designed Hanford had set tolerance doses for human exposure.

Contamination from the plant affected the Columbia River as well. River water that cooled the reactors was passed through the plant and discharged downstream. In one instance, a dike broke and 28 pounds of uranium spilled into the river.

Over the years, as technology developed and safeguards were put into place, the amount of radiation released by the plant dwindled to almost nothing. In total, from 1944 to 1972, the facility released about 739,000 curies of iodine-131, the vast majority of it in the first five years, though plaintiffs contend that the amount is likely even higher.The Columbia River pollution peaked in the late 1950s to mid-1960s.

The amount is far less than Chernobyl, which released more than 10 million curies of iodine-131, or the Fukushima plant in Japan, which has released an estimated 2.4 million. The difference, though, is that the people in the Soviet Union (at least to some degree) and Japan were aware of what was happening. If the danger is known, the absorption of radioactive iodine can be blocked by taking potassium iodide — but the people near Hanford knew nothing for 40 years.

A SCENE FROM THE WILD WEST

The disclosure began in 1986, when Hanford was one of three final candidates for a permanent nuclear waste dump (Yucca Mountain in Nevada was chosen instead). At a 1985 community forum to discuss concerns about potential health hazards, Michael Lawrence, who was the Hanford plant manager for the Department of Energy, promised to release records about past emissions in what seems to have been a misguided attempt at reassurance. On Feb. 27, 1986, Energy officials released 19,000 pages of documents, including partial data about the radioactive releases.

Press reports and public outcry followed — and so did lawsuits.

In the early 1990s, radiation cases were proliferating. The Department of Energy had just settled a class action filed over contamination from its Fernald uranium processing plant in Ohio for $78 million. Roselle's firm, Waite Schneider, was lead counsel. In a later Fernald case, Van Wart was among the opposing counsel.

Another Hanford plaintiffs' firm, Phil­adelphia's Berger & Montague, handled litigation stemming from the Three Mile Island accident. The firm went on to work with Waite Schneider in suing the government over pollution from the Rocky Flats nuclear weapons plant in Colorado. Again, Van Wart was on the other side (Years later, he thanked both firms in court for creating "a new practice area for me and my firm. I appreciate it.").

As a series of personal injury claims rather than a class action by property owners, Hanford was bound to be more complicated than the other cases. It was also potentially more lucrative — according to the defense, the plaintiffs wanted $2 billion to settle the matter, though plaintiffs insist they never asked for more than $500 million.

The cases, In re Hanford Nuclear Reser­vation Litigation, were consolidated in the U.S. District Court for the Eastern District of Washington in 1991. The joint complaint alleged violations of the Price-Anderson Act, charging that the defendants acted intentionally or negligently, and asked for compensatory and punitive damages for physical, emotional and economic harm. The matter was assigned to Judge Alan McDonald, who wrote that "the potential enormity of this litigation, as well as the dollar amount of any recovery, is almost staggering."

To attract would-be clients, some plaintiffs' lawyers went town to town holding local meetings, put up kiosks in shopping malls and advertised — but didn't always do much in the way of vetting. Some who signed on, it turns out, didn't live in the area when the radiation releases occurred.

Still others complained of ailments like bad teeth and gray hair that weren't caused by radiation. Another plaintiff, in an interrogatory, described her symptoms as follows: "As I would face the street light on the corner where I was standing, it would go out. I attribute that to my being radioactive."

"It was like a scene from the Wild West," Van Wart said. "Their only focus was on enrolling plaintiffs." He attributes some of the case's subsequent delays and costs to the bloated roster of clients. "By their indiscriminate claims-solicitation practice, the plaintiffs' lawyers dug themselves into a huge financial hole," he said.

Roselle dismisses this as little more than "defense rhetoric." At the time, she said, it wasn't clear exactly who had been exposed to what. "People were understandably concerned, and would go to a lawyer to get representation."

Still, plaintiffs' lawyer Richard Eymann, a name partner at Eymann, Allison, Hunter, Jones in Spokane who became involved in the case after the rush to sign clients, does concede that "some of the claims were not legitimate."

Also, many of the original claims were from people who were not sick, but who wanted medical monitoring. They were dismissed early in the proceedings.

THE DARLING OF THE PEOPLE

The plaintiffs' lawyers — there are nearly three dozen of them listed on court papers — initially asked that the case be certified as a class action, a request that they eventually withdrew, recognizing the injuries were too individual to be lumped together.

It would, however, have simplified the lawyering immensely. If Hanford had been a class action, the judge would have appointed lead class counsel, selecting a lawyer with the expertise and resources to call the shots.

Instead, the plaintiffs all picked their own lawyers. The one most of them preferred, who empathized and listened and kept them informed, was Nancy Malee Oreskovich.

Oreskovich, who began practicing law in 1989, the year before the first cases were filed. But she wound up representing the largest group of clients, a contingent of 1,500 and 2,000 known as the Berg plaintiffs, named for a plaintiff, Louis Berg.

"The other lawyers called me the 'darling of the people,' " said Oreskovich.

Not only was the case enormous and complex, with formidable opposing counsel representing the best-funded defendant in the world, the plaintiffs' lawyer with the most clients had "never tried a case…and had no experience in personal injury litigation," McDonald said in court papers.

Oreskovich's issues with the other plaintiffs' lawyers began almost immediately.

Seattle solo practitioner Tom Foulds originally brought Oreskovich into the case, hiring her to work for him in 1991."I realized after six weeks that it wasn't going to work out," he said. "But I knew she would connect with clients. She sure did." Oreskovich continued on her own with the case and was the only plaintiffs' lawyer who refused to dismiss Westinghouse Hanford Co. as a defendant. The company, a subsidiary of Westinghouse Electric Corp., took over running the plant in 1987, at which point virtually no radiation was being released, according to a government environmental report.

The other lawyers saw little point in suing Westinghouse, but Oreskovich forged ahead on her own. In 1994, McDonald dismissed Westinghouse from the case, later describing Oreskovich's efforts as "a waste of the court's time and her clients' money."

In 1995, Oreskovich joined forces with Eymann, a well-known Spokane plaintiffs' lawyer who went on to serve as president of the Washington State Bar Association in 2000. He agreed to fund expert witnesses and other expenses in return for serving as co-counsel to Oreskovich's clients.

Within a few months, the ­arrangement had gone sour. Eymann filed a motion to withdraw from the case in April 1996, citing "irreconcilable differences" with Oreskovich.

"The court is greatly disturbed," McDonald wrote, noting that Oreskovich's prior co-counsel, William Vines, had also withdrawn. "The court indicated it would not tolerate continued disruption in the representation of this plaintiff group."

He demanded a "detailed and exhaustive list" of Eymann's reasons for quitting within seven days. When he got it, he appointed a magistrate judge to investigate the allegations.

McDonald, in court documents, summarized the magistrate judge's 40-page report, saying that it contained more than numerous factual findings of misconduct against Oreskovich (according to a later 9th Circuit opinion, the magistrate made more than 150 findings). Among the issues McDonald cited: billing personal and other client costs to the Hanford account and submitting interrogatory responses that were not reviewed, approved or signed by the clients.

On Nov. 12, 1996, McDonald disqualified her as counsel, writing, "Her incompetency and bad faith conduct threaten the integrity and orderly progress of this litigation."

After five-year investigation, the state bar, in an Oct. 18, 2001 order, dismissed all charges against Oreskovich, though it called her approach "sloppy." "At the end of the day, the bar only affirmed what my 2,000-plus clients had determined for six years consistently — that I had complied with all ethical and competency requirements on their behalf," Oreskovich said.

Meanwhile, Oreskovich's clients were livid. They petitioned the court, the U.S. Court of Appeals for the 9th Circuit, even then-Vice President Al Gore, demanding that Oreskovich stay on. "I am extremely angered that the court system is raping downwinders once again," wrote one client, Kay Sutherland, in a letter Oreskovich submitted to the Washington State Bar Association. "The court system does not have the right to choose my attorney."

About half of her clients dropped out of the litigation. The others retained Eymann or Brian Depew, a partner at Engstrom, Lipscomb & Lack in Los Angeles.

DOUBLE OR NOTHING

With Oreskovich gone, McDonald temporarily severed the Berg plaintiffs from the rest of the case to give their new lawyers time to catch up.

The others began to drill down into the core of the case. The key issue was causation. There was the generic question: Did Hanford emissions have the capacity to cause the illnesses people complained of? And the specific question: Did each individual plaintiff receive a high enough dose of radiation to cause that person's particular disease?

The plaintiffs believed that to survive summary judgment, they only needed to prove emissions from Hanford could cause the illnesses. After that, the lawyers planned to present evidence about each plaintiff's exposure, disease and other risk factors like diet and family history.

The defendants countered that for claims to move forward, every plaintiff had to show he or she had been exposed to a threshold dose of radiation that statistically "doubled their risk" of harm. Otherwise, the lawyers argued, they couldn't ever prove Hanford caused their illnesses, since the diseases all occur in the general population as well.

Both sides filed summary judgment motions, and in 1998 McDonald issued a 762-page decision that essentially destroyed the plaintiffs' case.

"Proving radiation is 'capable of causing' a disease does not entitle any plaintiff to get his/her case before a jury," he wrote. Instead, he wholeheartedly embraced the defense's theory, writing that the plaintiffs had to show up-front they'd received doses of radiation that doubled their risk of getting sick.

The judge then excluded the testimony of 17 of the plaintiffs' expert witnesses completely or in part as irrelevant. Any plaintiff whose claim relied on one of these experts was removed from the case. In the end, almost no one was left.

"It was a scathing analysis," plaintiffs' lawyer Foulds said. "He went out of his way to dismiss our experts."

The plaintiffs appealed to the 9th Circuit. Two years later, the court resuscitated the case, faulting McDonald for overreaching. "Radiation is capable of causing a broad range of illnesses, even at the lowest doses," wrote then Chief Judge Mary Schroeder for the unanimous panel. "The district court should not have ventured into individual determinations at this stage."

The case, now 11 years old and with little established but the fact that radiation can cause diseases, was sent back to McDonald in 2002.

'A WASTED DECADE'

At this point, it was apparent to the plaintiffs' lawyers that McDonald, who was appointed by President Ronald Reagan in 1985, had little sympathy for their cause. "A true enemy," is how Foulds put it.

Foulds did some digging on the judge and discovered that McDonald owned millions of dollars in local real estate, including orchards and other agricultural lands near Hanford. Of particular interest: the judge's purchase in 1999 of an orchard near Ringold, Wash., where some of the heaviest radioactive contamination occurred. In bank documents, McDonald certified the land was free of contamination, including radiation.

In December 2002, Foulds filed a motion asking McDonald to recuse himself, writing that the properties created a "clear and present acute financial conflict" and "a mind-set that is naturally adverse to any reports of contamination." No co-counsel initially joined in the motion. "Everyone was so scared of a federal judge," Foulds said. "I did it entirely on my own."

But it worked. In a response brimming with anger, McDonald in March 2003 agreed to recuse himself, calling his service "a wasted decade of time and study."

The judge found the timing of the request deeply suspicious, writing that, "[h]owever one looks at it, plaintiffs' recently filed recusal motion follows the rendering of a decision adverse to them." McDonald noted that for the past 17 years on the bench, he had filed annual financial disclosure reports. "Even if the plaintiffs did not bother to review the court's annual financial disclosure, all they had to do was read the newspaper," where he said there had been half a dozen articles about his assets.

Born in 1927 and raised about 75 miles from Hanford in Yakima County, McDonald (who died in 2007) was technically a downwinder himself. He took issue with Foulds' basic premise that a pro-plaintiff ruling might decrease the value of his land. Any land buyer would already be aware that the counties surrounding Hanford "have allegedly been the primary depository of the radioactive ash," he wrote, and noted that area land values have nonetheless increased.

Still, he recused himself. If he failed to do so, he reasoned, he'd just cause more delay, either via an immediate appeal to the 9th Circuit, or as ground for an appeal down the road. And perhaps he was still smarting from a recent reprimand from the circuit — which chastised him for exchanging notes with his clerk referring, for example, to Hispanic people as "greasers" — and dared not risk another shaming.

"Too much of the time in the trial court involved collateral issues," he wrote. "The toll of time on the parties and their rights to have this matter resolved in their lifetime cannot be ignored."

That was eight years ago.

THE BELLWETHER BET

The case was reassigned to Nielsen, a 1991 George H.W. Bush appointee, who faced the daunting task of getting up to speed on proceedings where nearly 1,300 motions, orders and notices had already been filed. "We want to get this case on track, get it moving," he said optimistically in his first meeting with counsel.

He scheduled bellwether trials for 2005, where each side would pick a few plaintiffs, present their cases to a jury and then (in theory) use the verdicts as guideposts to settle the other claims.

The first question was which cases to try. The plaintiffs' lawyers proposed that the proceedings be limited to those involving thyroid disease, which make up approximately two-thirds of the claims. These were the most straightforward to prove — radiation is the only known cause of thyroid cancer, according to the plaintiffs' lawyers. Claims involving other cancers such as bone, liver or stomach, linked to plutonium exposure or contaminants from the Columbia River, would wait.

"Bringing in all these extra different experts, different dose reconstructions, it gets extremely complicated," Roselle said during an August 2003 status conference, according to the court reporter's transcript.

It also gets expensive — more expert witnesses meant more bills to pay, and plaintiffs' lawyers were already deep in the red. Focusing on thyroid cases was one way to conserve resources.

The defense protested that the trials should include a cross-section of diseases, but Nielsen opted to make the proceedings thyroid-only. Since then, the nonthyroid-cancer cases — there are 439 of them — have received scant attention. But last week, the judge said that 30 of these cancer cases may go to trial, with dates and details to be determined in the coming months.

The defense lawyers picked six plaintiffs who had what they said were "representative" claims. Those claims were dismissed on dispositive pretrial motions, court documents say. The other six, the ones picked by the plaintiffs' lawyers, had their cases presented to a Spokane jury in 2005.

Three had hypothyroidism — a condition in which the thyroid is underactive, causing symptoms like fatigue, depression and weight gain. The jury rejected all of their claims, finding Hanford did not cause their illnesses. The verdicts were overturned on appeal in 2007 based on erroneous evidentiary rulings, and the cases have not been retried.

The other three had thyroid cancer. One was awarded $317,000, another, $228,000 after the jury found their cancers were "more likely than not" caused by Hanford.

But huge jury verdicts weren't necessarily expected. That's because the first two plaintiffs had thyroid cancer that was successfully treated — in fact, the five-year survival rate for thyroid cancer is 97%, according to the American Cancer Society.

But the third, Shannon Rhodes, had terminal thyroid cancer that had spread to her lungs. (Rhodes died in May). This was supposed to be the high-value case, the money maker. Eymann in closing arguments asked the jury to award her $20 million to $30 million, according to the trial transcript. "What would a person pay to live another year, to see their daughters, to be held by their husband.…Everybody, who would not pay that, a million a year for those years?" he said.

The jury deadlocked and her case was retried the same year.

The second time around, Rhodes lost. The jury found, 11-1, in favor of the government that emissions from Hanford most likely did not cause her cancer.

THE BIGGEST MISTAKE

How did the plaintiffs' lawyers miscalculate so badly?

In large part, it came down to a single number — the rad, or radiation absorbed dose. The biggest mistake, plaintiffs' lawyers say in retrospect, was agreeing to use rad estimates derived from the government's Hanford Environmental Dose Reconstruction (HEDR). In 1987, the Department of Energy launched the $27 million study under the auspices of the Centers for Disease Control and Prevention but conducted by one of Energy's main Hanford research contractors. Battelle N.W. Computer models factored radioactive emissions plus a person's age, sex, place of residence and diet to come up with his or her rad. Those youngest and closest to Hanford during the years of peak emissions had the highest rads.

By agreeing to use the HEDR model, the plaintiffs streamlined the trials — there was no fighting over how to calculate a rad — and saved money on expert witnesses.

According to HEDR, the first two cancer plaintiffs both had doses of 27 rads. But Rhodes' dose was only 6.9 rads — not enough to convince the jurors that Hanford caused her disease. In fact, one expert testified that by age 30, people in the United States on average have a whole-body dose of up to 10 rads, and a thyroid dose of five to seven rads from sources such as radon, cosmic rays, X-rays and even airplane flights.

"If we had to do it over again, we wouldn't have stipulated to use HEDR," Eymann said. "We did it for trial efficiency, and because we believed at the time that with our experts, we could show that thyroid cancer was caused by doses above one rad."

Foulds was harsher in his assessment. "The decision itself was fundamentally flawed, both scientifically and as a trial tactic," he wrote in an April 2009 motion that highlighted the divisions within the plaintiffs' lawyer ranks. Foulds said he never wanted to use HEDR in the first place, but was "kept out of the loop of discussion on the decision…apparently because [my] opposition was known and on the record," he wrote.

After the bellwether trials, co-counsel decided Foulds was right all along, and that HEDR produced inaccurate, low-ball doses. They now argue the study used incomplete meteorological data plus erroneous assumptions about how the terrain around Hanford influenced the path of the emissions. Also, the model assumed that area cows ate stored feed rather than pasture grass exposed to iodine-131, and failed to reflect the plaintiffs' rural diet of homegrown food, they say.

"Any time there's a range of input data, [HEDR] always chooses the lowest number," said plaintiffs' lawyer Roy Haber, a Eugene, Ore., solo practitioner who represents several hundred plaintiffs.

Going forward, most of the plaintiffs' lawyers are pinning their hopes on an alternate study by Douglas Crawford-Brown, executive director of the Cambridge Centre for Climate Change Mitigation Research, which yields vastly higher rad doses. Using the Crawford-Brown model, the dose received by plaintiff Rhodes, for example, would be 80 rads instead of 6.9, Eymann said.

Scott Blake Harris, who stepped down as general counsel of the Department of Energy in March to head Neustar Inc.'s legal department, finds the numbers improbable.

"In my personal opinion, the Crawford-Brown data doesn't pass the laugh test," he said. "It would predict, literally, thousands of thyroid-cancer cases in the Hanford area. Yet even the plaintiffs' counsel could find only about 250 cases to file."

The Centers for Disease Control and Prevention's 2002 Hanford Thyroid Disease Study, which was mandated by Congress, found rates of thyroid disease near Hanford did not differ from those in the general population. "Subsequent scientific technical reviews had substantial criticism in the way in which the study was conducted and the results were reached," Eymann said.

A later study found men who grew up near Hanford had higher rates of thyroid disease — but didn't link this to iodine-131.

The bellwether trials have proven to be of little use in settling the case. During Harris' two-year tenure as general counsel, the two sides mediated about 50 thyroid-cancer cases, and the government made settlement offers for the first time to all the thyroid-cancer plaintiffs. "We tried to settle every case we thought was even arguably meritorious, and even made nominal offers in cases that weren't — simply because we thought bringing these cases to a close would be in the public interest," Harris said.

Those with the highest rads were offered up to $150,000 — on par with the Department of Labor's standard payment to Hanford workers who later contracted certain cancers. Plaintiffs with the lowest rads — some as low as 0.5 — received offers in February of $10,000.

"We really had to think seriously about making the $10,000 offers," said a senior official at the Department of Energy who asked not to be identified by name because the litigation is pending. "For taxpayers to lay out any significant amount of money, plaintiffs had to lay out some proof that what they experienced was actually caused by Hanford." About 30 to 40 plaintiffs accepted the offers, he said.

It's not just the taxpayers' money. Any settlement payments come from the Department of Energy's budget, not the U.S. Treasury. "We don't have all that money sitting around," the official said. "We have to find it or get it appropriated." That feat will only be more difficult going forward, given the federal budget crisis.

The offers were not well-received by the plaintiffs' lawyers. "The value of the case [to the government] is determined by the dose, not by how much someone suffered," said Depew of Engstrom Lipscomb, who represents about 400 plaintiffs. "They refuse to compensate people based on the injury. Whether someone received an extra rad or two doesn't make their cancer worse or better."

A few of his clients accepted the offers, he said, but only out of desperation. One woman was dying, while another was homeless and used the money to buy a trailer.

Plaintiffs' lawyers in court papers say further settlement discussions are going nowhere because the defendants "cling to the flawed HEDR model" in deciding the value of the cases. To the government, low rads equal a low offer, but plaintiffs assert the dose estimates themselves are not valid.

Harris responded, "There is no way that the government can settle these cases based on the assumption that all of the science accepted by the courts so far is wrong."

The plaintiffs hope to change that. In May, they filed a longshot motion asking the court to exclude HEDR rad doses from evidence going forward on the ground that the data would mislead a jury. A hearing is set in September,

A new trial is scheduled for April 30, 2012, for 20 hypothyroid plaintiffs chosen by lottery, and determining their rads is likely to be one of the most critical issues.

Last week, the judge also ordered trials for 32 to 33 thyroid-cancer cases and 50 cases involving thyroid nodules — solid or fluid-filled lumps that form within the thyroid — with dates to be determined.

JUSTICE DELAYED

But for one plaintiff, Deborah Clark, all the wrangling over doses and rads didn't change the fact that she was dying.

Clark, who grew up in eastern Oregon drinking raw cow's milk, had thyroid cancer that spread to her lungs. Eymann claimed her radiation dose was 35 rads and wanted $2 million to settle her case. The government said it was less than one rad and offered $10,000.

Last year, Eymann made an impassioned plea to the court to grant her an expedited trial, even though it would throw off the schedule for the hypothyroid trials. "It is Mrs. Clark's desire that she 'have her day in court' prior to her premature death," he wrote. "The issue is her right to justice versus efficiency concerns." And he argued that granting her a trial within five months could help resolve questions over HEDR and Crawford-Brown that have brought the rest of the case to such an impasse.

But lawyers from Kirkland & Ellis were having none of it. The plaintiffs are "trying to cherry pick claims and derail a carefully conceived process," partner Bradley Weidenhammer wrote. "Mrs. Clark is not unique. Time is of the essence for a large number of elderly and ill plaintiffs in this case."

"There is no evidence suggesting she will die within one year, as opposed to two or three or 10 years," he continued in a motion filed on Feb. 10, 2010. He was right. She didn't die within a year. It was a year and two days, on Feb. 1 2, 2011.

The defense even opposed a bid to conduct an expedited deposition of Clark's mother, then 79 and in failing health, who was the only person who could testify about her daughter's milk intake as a child. Weidenhammer wrote that it was "counter-productive to pursue discovery as to plaintiffs who are not yet scheduled for trial" — even, presumably, if it meant the evidence dies with them. Nielsen denied the motion for speedy trial, but ordered the expedited deposition of Clark's mother.

It's increasingly clear for all the plaintiffs that time is running out. As of last year, more than 800 were older than 70, and 174 were older than 90. Eymann reports that 123 of his clients — about 30% of them — have already died.

Looking ahead, it's hard to see how the litigation will end. At the moment, neither side seems inclined to budge on settlement amounts, but the alternative — trying each case, one by one, before a jury — could take decades.

If you ask Van Wart, it's the plaintiffs' lawyers' fault that the case has dragged on for so long. "The problem for the plaintiffs is that it costs more for them to take the cases to trial than they can recover," he said. "The plaintiffs' lawyers are standing in the way of resolution because of their financial predicament. They're hoping somehow, someone will bail them out and give them a big basket of money."

The plaintiffs' lawyers are equally quick to blame the defendants for refusing to make what they consider to be fair offers. "No one has big dreams. No [plaintiffs'] lawyer is going to see a dime of profit off this case," Depew said. "The only one making money is Kirkland & Ellis. I just want something for my clients."

The downwinders are left stranded in the middle. People with valid claims have not received the "full and prompt compensation" that the Price-Anderson Act promised them nor have they had a chance for a jury to evaluate their cases. Consider Sharon Bentz, who is 62. Born in Spokane and raised in the little town of Elmira, Ore., she's one of the plaintiffs who showed up for the status conference in late April. In recent years, she's been terribly ill — a carcinoid tumor in her appendix, a heart attack, diabetes, glaucoma, a hysterectomy, hives covering her body — and thyroid disease. Such an array of ailments doesn't make much sense to her, except maybe Hanford has something to do with it.

Whether she'll ever have her day in court, with expert witnesses opining on the cause of her illnesses, is an open question, one she is ill-equipped to answer. As she is sitting outside the Spokane courtroom, on the bench next to Carole Means, Eymann walks by. Neither woman recognizes him. They've never met their lawyer.

"It's been such a burden for my family and friends. I've been so ill," Bentz said. "I know the attorneys are doing their jobs." But after so many years of waiting, she added, "I just get frustrated."

Jenna Greene

GRAPHICS GALLERY
Explore the multimedia components of our special report on the Hanford litigation.

Levels of radiation The contamination lifecycle The timeline of events A breakdown of the contaminants

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