TEPCO has been ordered to pay Mikio Watanabe (pictured) nearly 500,000 US dollars in compensation for the suicide of his wife, Hamako (58 years), after they were forced to leave their home and livelihoods in Kawamata town (40 km from the reactors) d…
Continue readingCategory Archives: nuclear
Karl GrossmanKarl Grossman (photo, left) has published an article at Enformable about a “Differing Professional Opinion” filed by Dr. Michael Peck, the U.S. Nuclear Regulatory Commission’s (NRC) top on-site inspector at Pacific Gas & Electric’s twi…
Continue readingKarl GrossmanKarl Grossman (photo, left) has published an article at Enformable about a “Differing Professional Opinion” filed by Dr. Michael Peck, the U.S. Nuclear Regulatory Commission’s (NRC) top on-site inspector at Pacific Gas & Electric’s twi…
Continue readingvia therakyatpost.com / August 26, 2014 / A Japanese court has ruled that Fukushima nuclear operator Tokyo Electric was responsible for a woman’s suicide after the March 2011 disaster and must pay compensation, in a landmark ruling that could set a precedent for other claims against the utility. The civil suit by Mikio Watanabe claimed that Tokyo Electric Power Co Inc (Tepco) was to blame for the July 2011 death … Continue reading →
Continue readingvia Japan Times / August 26, 2014 / A groundwater bypassing operation at the Fukushima No. 1 nuclear plant has yet to produce significant results in preventing groundwater from flowing into the basements of reactor buildings, Tokyo Electric Power Co. said. By last Thursday, about three months after the effort was launched, a total of around 25,000 tons of water had been pumped from underground and released into the sea. … Continue reading →
Continue readingvia Japan Times / August 26, 2014 / The Japanese government picked three overseas companies Tuesday to participate in a subsidized project to determine the best available technology for separating radioactive tritium from the toxic water building up at the Fukushima No. 1 nuclear plant. Tokyo Electric Power Co. is currently test-running a system it says is capable of removing 62 types of radioactive substances from the contaminated water, but … Continue reading →
Continue readingEnvironmental coalition members from the Crabshell Alliance, Sierra Club Nuclear-Free Campaign, NIRS, PSR, NEIS, and Public Citizen “just say NO!” at the NRC HQ nuke waste con game public comment meeting on 11/14/13 in Rockville, MD. Photo credit …
Continue readingvia NHK World / August 20, 2014 / Workers have begun the difficult task of decommissioning the Fukushima Daiichi Nuclear Power Plant. One of the biggest hurdles they’re facing is how to remove melted fuel from the crippled reactors. First they need to know the condition of the fuel. Experts believe it has cooled down and turned into debris. But engineers with Tokyo Electric Power Company have not been able … Continue reading →
Continue readingvia abs-cbnnews.com / August 23, 2014 / The government plans to make public testimony regarding the Fukushima Daiichi nuclear disaster given by plant chief Masao Yoshida, government and other sources said Friday, possibly shedding light on whether Yoshida ordered staff to remain at their posts. Chief Cabinet Secretary Yoshihide Suga will announce as soon as Monday the decision to release the testimony by mid-September or later, the sources said. The … Continue reading →
Continue readingvia Asahi Shimbun / August 24, 2014 / The number of young people in Fukushima Prefecture who have been diagnosed with definitive or suspected thyroid gland cancer, a disease often caused by radiation exposure, now totals 104, according to prefectural officials. The 104 are among 300,000 young people who were aged 18 or under at the time of the 2011 Fukushima nuclear disaster and whose results of thyroid gland tests … Continue reading →
Continue readingDon’t Waste Michigan board members Michael Keegan, Alice Hirt, and Kevin Kamps call for Palisades’ permanent shutdown at the 2000 Nuclear-Free Great Lakes Action Camp, on the Lake Michigan beach at Van Buren State Park, with the atomic reactor’s co…
Continue readingvia fukushimainform.com / August 18, 2014 / This diary is part of an ongoing series here that aims to report measurements of Fukushima derived radionuclides in the North Pacific Ocean to help determine the likely impact on ecosystem and public health in western North America. The purpose of this diary is to report the results of a recently published study by Kumamoto and colleagues in the open-access journal Scientific Reports. … Continue reading →
Continue readingvia Japan Times / August 21, 2014 / Tokyo Electric Power Co. said Wednesday it expects to finish transferring all the fuel rods from the spent-fuel pool perched atop reactor 4 at the stricken Fukushima No. 1 nuclear power plant by November — one month ahead of the initial schedule, according to Tepco President Naomi Hirose. Hirose made the comments in a meeting with assembly members from Fukushima Prefecture. Hazardous … Continue reading →
Continue readingIn a nutshell all we are saying is that this process should be slowed down to ensure the best possible choice of dry cask canisters is made, spend the money wisely “once” to avert another steam generator type disaster and ensure the safety of California’s future. Gene Stone & Donna Gilmore.
Premature Failure of U.S. Spent Nuclear Fuel Storage Canisters
The California Public Utility Commission (CPUC) should delay funding the new San Onofre dry cask storage system until Southern California Edison provides written substantiation that the major problems identified below are resolved.
San Onofre’s Chief Nuclear Officer, Tom Palmisano, told the California Senate Energy, Utilities and Communications Committee on August 12th that Edison plans to decide in August or September on a dry cask system vendor. The dry casks systems Edison is considering may fail within 30 years or possibly sooner, based on information provided by Nuclear Regulatory Commission (NRC) technical staff. And there is no technology to adequately inspect canisters and no system in place to mitigate a failed canister.
Edison created an artificial date of June 2019 to have all the spent fuel assemblies loaded into canisters. We don’t need to rush into another “steam generator” like boondoggle. Edison’s Tom Palmisano told the California Senate Energy, Utilities and Communication Committee on August 12th that issues regarding high burnup fuel and dry cask storage have been addressed. However, these issues have not been resolved.
Canisters may need to be replaced within 30-42 years or sooner.
Recent information provided by the NRC technical staff indicates dry storage canisters may need to be replaced within 30-42 years or sooner, due to stress corrosion cracking of the thin (1/2 to 5/8 inch) stainless steel canisters (due to our coastal environment). Similar stainless steel materials at nuclear plants have failed within 16 to 33 years. The concrete overpacks also have aging issues that are accelerated in coastal environments. 
Southern California Edison has budgeted $400 million dollars for the dry storage system. As Commissioner Florio stated after the recent CPUC meeting in Costa Mesa, “We don’t want to have to buy these again.”
No remediation plan to repair or replace failed canisters.
The NRC stated that if one of the canisters becomes defective (e.g. 75% through-wall stress corrosion cracks), there is no way to repair or replace the canister; especially if the spent fuel storage and transfer pools are demolished, as Edison plans to do. And before a canister can be transported (inside a transport cask), the canister must not have cracks.
No technology to adequately inspect canisters for stress corrosion cracking.
The NRC states technology does not exist to adequately inspect steel canisters for stress corrosion cracks or to measure how or when the cracks will go through the wall of the canister. They plan to allow the nuclear industry 5 years to try to develop technology. And then they only plan to require inspection of one canister at each nuclear plant.
No license renewals until aging management issued addressed.
The NRC is in the process of developing an aging management plan due to the new requirement that dry storage systems need to last 100 to 300+ years. They are delaying license renewals until unresolved aging management issues can be addressed. However, they plan to allow the NUHOMS 32PTH2 canister that Edison may procure to be included in an existing license. The NRC is evaluating how long dry storage systems will last. Previously, they only needed to last 20+ years with the assumption there would be a permanent repository.
No canisters approved for high burnup fuel for more than the initial 20 years.
The NRC has not extended licenses past the initial 20 years for storage of high burnup fuel (>45GWd/MTU) due to unknowns about high burnup fuel in storage and transport. This fuel is over twice as radioactive and hotter than lower burnup fuel. The NRC has allowed nuclear plants to burn fuel longer, without the research to show that it is safe in storage and transport. The protective fuel cladding can become brittle and crack; resulting is higher risk for radiation exposure, if the canisters fail.
NUHOMS dry canister license certification expires in less than nine years.
The NUHOMS DSC-32PTH2 canisters that Edison wants to procure are not yet licensed by the NRC. If approved, the license will expire in less than nine years (February 5, 2023), since Areva-TN decided to avoid a new license certification and include it in their existing license for the DSC-24PT series, which has a different design.
New design of the NUMHOMS DSC-32PTH2 eliminates failed fuel cans.
Unlike the existing 24 fuel assembly canisters, the new 32 fuel assembly canisters have no provision for Failed Fuel Cans. This means damaged fuel assemblies (of which San Onofre has many) cannot be used in the DSC-32PTH2 canisters. The NRC and DOE require fuel assemblies to be retrievable so they can be transferred to other containers. The Failed Fuel Cans met this requirement.
Background
On July 14th, 15th and August 5th the NRC had public meetings to address aging management issues with dry cask storage system. Their goal is to require an aging management plan before relicensing or issuing new licenses, now that the NRC knows on-site or interim dry cask storage will be needed for up to 300 years or more. The NRC stated the earliest date for a permanent repository is 2048 and that is optimistic. They are researching on-site and interim dry cask storage requirements for 40,100, 150 and 300+ years. No NRC canisters are certified for extended storage or for geological repository storage. Canister licenses for the more dangerous and unstable high burnup (>45GWd/MTU) spent fuel have not been renewed for more than the initial 20 year license, even for expired licenses. And the NRC’s Bob Einziger states there are still transportation problems with high burnup fuel. NRC staff plan to have a draft for public comment regarding dry cask storage relicensing by the end of 2014, according to Mark Lombard, Director, Division of Spent Fuel Storage and Transportation. However, this will not address our current issues.
Stainless Steel Dry Canister Problems
Darrell Dunn, an NRC materials engineer, stated stainless steel dry storage canisters are vulnerable to failure within about 25 – 42 years. If any of the fuel cladding in the canister fails, there is no protective barrier and we could have a serious radiation release. The NRC said they have no current mitigation plan for that consequence. They suggested we MIGHT be able to put the fuel back in the spent fuel pool. However, Edison plans to destroy the spent fuel and transfer pools. And there is no technology to repair the canisters. The NRC said they HOPE there will be a solution for mitigation in the future. Even an NRC May 2nd High Burnup Fuel letter admits there are mitigation problems.
No Inspections of Stainless Steel Canisters
To make matters worse, these stainless steel canisters are not inspected after they are loaded into the unsealed concrete overpacks (Areva NUHOMS) or concrete casks (Holtec and NAC Magnastor). The NRC proposed having each nuclear plant inspect the outside of only ONE stainless steel canister before they receive a license renewal and then do that once every 5 years. The industry balked at having to even check one canister at every plant. The problem with the stainless steel canisters is they do not protect against gamma rays; so it’s not a simple task to remove a canister from the concrete overpack/cask to examine the exterior for corrosion or other degradation. And since welded canisters do not have monitoring for helium leaks, we may not have any warning of an impending radiation release.
Concrete Overpack Corrosion Problems
Darrell Dunn discussed serious corrosion problems with the concrete overpacks/casks, especially in coastal environments.
Ductile Cast Iron Casks may be a better solution
Asked if San Onofre would be better off using ductile cast iron casks like the CASTOR, due to our coastal environment, Aladar (Al) Csontos, NRC Branch Chief in the Division of Spent Fuel Storage and Transportation (SFST), said that might be a better option near the ocean. Casks, such as CASTOR, may eventually have aging issues with bolts and seals. The CASTOR has double sealed lids, so even if one fails, we’ll still have a sealed canister. And Edison would be able to easily monitor for cask material degradation with all the casks.
The NRC licensed the CASTOR V/21 ductile cast iron cask years ago and the cask is still in use. In fact, a CASTOR V/21 was used to prove low burnup fuel is safe to store for over 15 years. However, none of the current U.S. cask designs have been tested even though they use a different storage technology. The U.S. industry chose a different technology (stainless steel/concrete overpack/cask) mainly due to the cost of ductile cast iron at the time and with the assumption that the canisters would only be needed until Yucca Mountain opened. The CASTOR V/21 was considered the “Cadillac” of the industry and the CASTOR line is still very popular in other parts of the world for BOTH storage and transport (including high burnup fuel). The CASTOR canisters have multiple certifications for quality manufacturing, unlike the U.S. stainless steel canisters that are allowed exceptions to ASME and other standards. Material prices for stainless and cast iron have changed, so the price point should be lower.
The CASTOR has pressurized lid monitoring to detect helium leaks and temperature changes. The welded U.S. canisters do not have this capability, but the NRC and Department of Energy (DOE) state this is a high priority issue to resolve.
The inside of the CASTOR cask, including the sealing surface, has a nickel coating for corrosion protection. On the outside, the cask is protected by an epoxy resin coating in the fin area and nickel coating elsewhere. And unlike the U.S. stainless steel canisters, it does not have stress corrosion cracking issues and does not require a concrete overpack/cask.
The original CASTOR V/21 is almost 15″ thick as opposed to the 1/2″ to 5/8″ stainless steel canisters. The newer model CASTOR V/19 is almost 20″ thick. There are other ductile cast iron canister brands that are used in other countries. However, the U.S. emphasis on cost rather than longer term safety discourages competition from better quality casks vendors. With new U.S. needs for longer term onsite and interim dry cask storage, this should change.
Forged Steel Casks (AREVA TN Series)
Areva makes thick walled forged steel casks (TN series), which were approved for limited use years ago by the NRC. The TN cask is much thicker than the stainless steel canisters and doesn’t require a cement overpack/cask. Its specifications are not as robust as the CASTOR, but better than the Areva NUHOMS system that Edison may procure. Fukushima Daiichi and Germany use some TN casks. Germany mainly uses the CASTOR casks.
Enclose Casks in Buildings
Both Japan and Germany enclose their casks in buildings for protection from the environment and other external forces. This is something Edison should consider.
Action Needed
No dry cask solution is even close to perfect, but we need to buy ourselves as much time as possible. Given the issues with stress corrosion cracking, concrete degradation, lack of monitoring, and lack of external inspection of stainless steel canisters, we can do better. Spent fuel pools are dangerous. However, the spent fuel needs to cool in the pools for a number of years, so we have time to do a better job selecting a dry cask storage system. Edison’s artificial deadline of June 2019 to have all canisters loaded should not be the driving factor for the future of California.
The NRC does not proactively research dry storage system designs. They only respond to vendor requests for licensing. Vendors will only do this if they think they have a customer lined up for their product. California needs to be that customer.
Edison should reopen the bidding to include vendors with other cask technology. Edison’s Community Engagement Panel (CEP) had a presentation from Areva, but from no other dry cask storage vendors. Edison only solicited bids from three canister system manufacturers who all have the problems mentioned in this document. Edison requested the NRC approve the NUHOMS 32PTH2 design – it was not licensed when they decided to use it. That license amendment (Docket No. 72-1029, Certificate of Compliance No. 1029 Amendment No. 3) may be approved in August. However, the CPUC should not approve funding for this canister system.
Edison has not shared with us the documents they used to solicit bids (Request for Proposal), so we have no idea what the requirements are in that bid package. That would be useful information and the public should have access to this information.
If you have questions about sources for any information, contact Donna Gilmore. There are also detailed references on the SanOnofreSafety.org website. A link to the NRC July and August presentations as well as other documents discussed here are on the following pages.
Donna Gilmore
SanOnofreSafety.org
949-204-7794, dgilmore@cox.net
SanOnofreSafety.org
949-204-7794, dgilmore@cox.net
Gene Stone
Residents Organized for a Safe Environment (ROSE)
Member, SONGS Community Engagement Panel
949-233-7724, genston@sbcglobal.net
Residents Organized for a Safe Environment (ROSE)
Member, SONGS Community Engagement Panel
949-233-7724, genston@sbcglobal.net
References
High Burnup Fuel
High Burnup Nuclear Fuel −Pushing the Safety Envelope, M. Resnikoff, D. Gilmore, Jan 2014 http://sanonofresafety.files.wordpress.com/2014/01/hbffactsheet01-09-2014.pdf
Letter from Chairman Macfarlane regarding high burnup fuel, May 2, 2014http://sanonofresafety.files.wordpress.com/2013/06/05-02-14-ltr-to-priscilla-star-fm-chairman-macfarlane.pdf
Response from Donna Gilmore to NRC regarding May 2, 2014 request for NRC high burnup fuel technical basis, June 25, 2014
NRC Presentations
NRC Meeting to Obtain Stakeholder Input on Potential Changes to Guidance for Renewal of Spent Fuel Dry Cask Storage System Licenses and Certificates of Compliance, July 14th/15th, 2014 (includes slide presentations)
Chloride-Induced Stress Corrosion Cracking Tests and Example Aging Management Program, Darrell S. Dunn, NRC/NMSS/SFST, Public Meeting with NEI on Chloride Induced Stress Corrosion Cracking Regulatory Issue Resolution Protocol, August 5, 2014
CASTOR Dry Casks (Ductile cast iron cask technology)
CASTOR V/21 NRC Certificate of Compliance and Safety Analysis Report, August 17, 1990 http://pbadupws.nrc.gov/docs/ML0330/ML033020117.pdf
CASTOR brochure (includes the CASTOR V/19 and other ductile cast iron casks).
GNS’ [CASTOR] experience in the long-term storage at dry interim storage facilities in Ahaus and Gorleben, IAEA Vienna, May 20, 2014 http://bit.ly/1jUSNOZ
Spent Fuel Storage and Transportation Experience, Idaho National Engineering Laboratory (GNS Castor V/21, Transnuclear TN-24P, Westinghouse MC-10, NAC S-100-C), 1987
BAM test results for CASTOR transport containers
Fracture Mechanics Based Design for Radioactive Material Transport Packagings, Historical Review, Sandia SAND98-0764 UC-804, April 1998http://www.osti.gov/scitech/servlets/purl/654001
GNS CASTOR Presentation, June 09-11, 2010, Varna, Bulgaria (slide 18: CASTOR V/19, V52)
Areva TN Series Casks (forged steel cask technology)
TN-24 NRC Certificate of Compliance and Safety Analysis Report, November 4, 1993
AREVA Innovation in the Design of the Used Fuel Storage System, CRIEPI Tokyo, November 15-17, 2010 (includes information on TN 24 casks)
AREVA Dual Purpose Casks in Operation, AREVA TN Experience, Vienna, May 19-21, 2014 http://bit.ly/1l9xO5R
NUHOMS 32PTH2 and San Onofre Decommissioning Plans
NRC Certificate of Compliance for Spent Fuel Storage Casks, COC 1029, Docket 72-1029, Amendment 3, Model No. Standardized Advanced NUHOMS®-24PT1, 24PT4, and 32PTH2, expires 02/05/2023 (pending NRC approval as of 8/20/2014)
Comments on Direct Rule re List of Approved Storage Casks (79 Fed. Reg. 21,121 (April 15, 2014), Request for Rescission of the Direct Rule, and Request for Publication of a New and Revised Notice of Proposed Rulemaking, Docket No. 13-0271, Diane Curran, on behalf of 20 environmental organizations and individuals.
February 10, 2012 letter from Edison to NRC: Support for NRC Review of Transnuclear Inc. Application for Amendment 3 to the Standardized Advanced NUHOMS® Certificate of Compliance No. 1029, San Onofre Nuclear Generating Station, Units 2 and 3 and Independent Spent Fuel Storage Installation Docket Nos. 50-36, 50-362 and 72041
Update on Decommissioning Plans, Tom Palmisano, Vice President & Chief Nuclear Officer, August 12, 2014 presentation to CA Senate Energy, Utilities and Communications Committee, Chairman Alex Padilla
Community Engagement Panel Correspondence
High Burnup Fuel and Dry Cask Storage Issues, July 17, 2014 letter to CEP Chairman David Victor from Donna Gilmore, San Onofre Safety
David Victor testimony to NRC Commissioners, July 15, 2014
Additional references at SanOnofreSafety.org
Aging Nuke Plants On Fault Lines In Tsunami Hazard Zones = Fukushimas… Any Questions?
PLEASE Turn off a light for Fukushima USA / San Onofre
PLEASE Turn off a light for Fukushima USA / San Onofre
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Continue readingAlthough atomic reactors and their transmission lines are inextricably interconnected, NRC failed to include them in its Fermi 3 FEISAn environmental coalition, including Beyond Nuclear, has warned for two and a half years, the U.S. Nuclear Regulatory …
Continue readingvia world-nulear-news.org / July 24, 2014 / New approaches to removing the contaminated water from trenches around units 2 and 3 at the damaged Fukushima Daiichi plant are being explored after attempts to freeze it failed. The trenches contain highly-contaminated water that has flowed from the main power plant buildings – a mixture of injected cooling water and groundwater that has leaked into the basements. In April, Tokyo Electric Power Company (TEPCO) attempted … Continue reading →
Continue readingvia NHK World / July 25, 2014 / Work to pump up groundwater to keep it from flowing into the contaminated Fukushima Daiichi nuclear plant is apparently having limited effects. Plant operator Tokyo Electric Power Company, or TEPCO, reported the results of the operation so far at a meeting of experts at the industry ministry on Friday. TEPCO began the so-called groundwater bypass operation in May. It involves draining water … Continue reading →
Continue readingAn NRC inspector visually examines severe cracking in the Davis-Besse Shield Building, Oct., 2011In a ruling on July 25th, the U.S. Nuclear Regulatory Commission’s (NRC) Atomic Safety and Licensing Board (ASLB) panel at Davis-Besse, OH rejected an envi…
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