April, 06 2011, 04:49pm EDT
Internal NRC Documents Reveal Doubts About Measures to Ensure U.S. Plants Survive Fukushima-Type Events
WASHINGTON
In the weeks following the Fukushima accident, Nuclear Regulatory Commission (NRC) and nuclear industry officials have been asserting that U.S. nuclear plants are better prepared to withstand a catastrophic event like the March 11 earthquake and tsunami than Japanese plants because they have additional safety measures in place.
However, according to internal NRC documents (links provided below) released today by the Union of Concerned Scientists (UCS), there is no consensus within the NRC that U.S. plants are sufficiently protected. The documents indicate that technical staff members doubt the effectiveness of key safety measures adopted after the September 11, 2001, terrorist attacks.
UCS obtained the documents on March 25 from a Freedom of Information Act (FOIA) request it made a month before the Japanese disaster.
"While the NRC and the nuclear industry have been reassuring Americans that there is nothing to worry about -- that we can do a better job dealing with a nuclear disaster like the one that just happened in Japan -- it turns out that privately NRC senior analysts are not so sure," said Edwin Lyman, a physicist with the UCS Global Security Program and an expert in nuclear plant design.
NRC and industry officials recently testified before Congress that U.S. reactors are fully prepared for the worst. For example, at a hearing hosted by the Senate Energy and Water Appropriations Subcommittee on March 30, NRC Chairman Gregory Jaczko testified: "As a result of the events of September 11, 2001, we identified important pieces of equipment that regardless of the cause of a significant fire or explosion at a plant, the NRC requires licensees to have available and staged in advance, as well as new procedures and policies to help deal with a severe situation."
Likewise, William Levis, the president and COO of the Public Service Enterprise Group, which owns two nuclear plants in New Jersey, told the subcommittee that "U.S. nuclear plant designs and operating practices since 9/11 are designed to mitigate severe accident scenarios such as aircraft impact, which include the complete loss of off-site power and all on-site emergency power sources and loss of large areas of the plant."
NRC calls these post-9/11 procedures "B.5.b measures," referencing the section of the compensatory measures order the agency issued in 2002 to all reactor licensees. The agency codified them in its regulations in 2009 in a document titled CFR 50.54(hh)(2), but because their details are security-related, they are not publicly available.
At the March 30 hearing, both Jaczko and Levis sounded confident that B.5.b measures would protect U.S. reactors from the kind of disaster that befell the Fukushima Daiichi nuclear complex, which lost off-site and on-site power for an extended period, eventually leading to the loss of all cooling. Internal NRC documents obtained by UCS tell a different story.
In February 2011, UCS filed a FOIA request for all information associated with a secretive NRC program known as the "State of the Art Reactor Consequence Analyses." SOARCA, according to the NRC, is "a research effort to realistically estimate the outcomes of postulated severe accident scenarios that might cause a nuclear power plant to release radioactive material into the environment. The SOARCA project applies many years of national and international nuclear safety research, and incorporates the improvements in plant design, operation and accident management to achieve a more realistic evaluation of the consequences associated with such accidents." The NRC also stated that SOARCA takes into account enhancements required by NRC after 9/11 -- the B.5.b measures.
The SOARCA program, which the agency initiated in 2006, focused on two plants: Surry in Virginia and Peach Bottom in Pennsylvania. Coincidentally, Peach Bottom is a Mark I boiling water reactor (BWR) like Fukushima Daiichi reactors 1 through 4. One of the hypothetical accidents that the SOARCA program analyzed was a station blackout at Peach Bottom where the plant failed to recover power before the backup batteries ran out -- the very situation that occurred at Fukushima. That analysis would be extremely useful to understand what happened at Fukushima. However, the NRC has withheld nearly all documents related to SOARCA from the public.
In most Mark I BWRs experiencing a station blackout, Lyman explained, a cooling system that runs on battery power, known as the Reactor Core Isolation Cooling system, or RCIC, is available. But when the battery runs down -- after eight hours or less -- the RCIC will stop operating. If plant workers do not restore alternating current power by then, no cooling systems will be available and the fuel in the reactor will overheat and eventually begin to melt. Most experts believe that is what happened at Fukushima Daiichi units 1 through 3.
According to the documents obtained by UCS, NRC's B.5.b measures contain unspecified strategies to continue operating the RCIC even after battery power is lost. However, the documents make clear that there are disagreements between NRC senior reactor analysts who work in NRC's regional offices under the Office of Nuclear Reactor Regulation and the staff conducting the SOARCA project, who are in the agency's Office of Research.
In particular, one NRC staff email exchange, dated July 28, 2010, described senior analysts' objections to SOARCA as follows: "One concern has been that SOARCA credits certain B5b mitigating strategies (such as RCIC operation w/o DC power) that have really not been reviewed to ensure that they will work to mitigate severe accidents. Generally, we have not even seen licensees credit these strategies in their own [probabilistic risk assessments] but for some reason the NRC decided we should during SOARCA. My recollection is that [Region I senior reactor analysts] in particular have been vocal with their concerns on SOARCA for several years, probably because Peach Bottom is one of the SOARCA plants."
In other words, senior reactor analysts who work directly with the Peach Bottom Mark I BWR apparently do not have faith in the effectiveness of the very B.5.b measures that the NRC and nuclear industry officials are touting as a reason why the United States is better prepared to deal with a Fukushima-like event than Japan.
Another (undated) document reinforces this concern: "The application of 10 CFR 50.54(hh) [2009 regulations] mitigation measures still concerns a number of staff in [the Office of Nuclear Reactor Regulation]. The concern involves the manner in which credit is given to these measures such that success is assumed.... 10 CFR 50.54(hh) mitigation measures are just equipment on-site that can be useful in an emergency when used by knowledgeable operators if post-event conditions allow. If little is known about these post-event conditions, then assuming success is speculative."
"If we are going to have any confidence that U.S. plants are safe, the NRC and the industry has to be completely open and honest about what they know and what they don't know," said Lyman. "They are doing Americans a disservice if they are saying publicly that these untested measures are effective when privately they are expressing doubts that they will work."
Note: UCS also released another NRC email today that briefly discusses the schedule of the SOARCA analysis.
The Union of Concerned Scientists is the leading science-based nonprofit working for a healthy environment and a safer world. UCS combines independent scientific research and citizen action to develop innovative, practical solutions and to secure responsible changes in government policy, corporate practices, and consumer choices.
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