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Wednesday Update

From NEI’s Japan micro-site:

TEPCO Takes Precaution Against Possible Fission in Fukushima Reactor

November 2, 2011

Plant Status

  • Workers at the Fukushima Daiichi nuclear energy facility have taken steps to halt the possibility of localized fission reactions in reactor 2 after detecting trace amounts radioactive xenon in the reactor’s containment vessel, NHK World reports. Xenon is a byproduct of fission. Tokyo Electric Power Co., which operates the facility, reports no significant changes in temperature, pressure and other data from the reactor.

Media Highlights

  • A special report on the IEEE Spectrum website looks at “Fukushima and the Future of Nuclear Power.” Articles include an in-depth review of the first 24 hours after the earthquake and tsunami struck the nuclear energy facility and a comparison of the Three Mile Island, Chernobyl and Fukushima nuclear accidents.
  • In a first since the March 11 nuclear accident, a shutdown reactor in Japan has resumed operation, the New York Times reports. After receiving approvals from the Nuclear and Industrial Safety Agency and the local government, reactor 4 at the Genkai nuclear energy facility came back on line this week. The reactor was inadvertently shut down Oct. 4 due to an operator error. However, it will shut down again in December for a scheduled inspection.
  • U.S. boiling water reactors “would have fared much better” in an earthquake and tsunami than the reactors at the Fukushima Daiichi nuclear energy facility, the website Electric Light & Power reports. The article says that U.S. facilities are subject to regulations that would limit damage in a severe natural event and that plants are located in places with minimal vulnerability to the kind of tsunami that struck Japan.

New Products

  • A new series on NEI’s Safety First website examines some of the industry and independent Nuclear Regulatory Commission’s post-Fukushima activities. Articles appearing this week explore seismic and flooding protection, safety during a loss of off-site electricity, used fuel storage, operator emergency training and accessibility of specialized vent valves.

Comments

Anonymous said…
"Trace" amounts of xenon? That doesn't sound like a really firm indicator of fission, much less criticality (fission doesn't necessarily mean uncontrolled criticality). Anyone done a decay calculation? I know a lot of half-lives have passed, but if your initial amount was very high, you could still have "trace" amounts left even after a lot of half-lives have passed.
D Pulaski said…
http://www3.nhk.or.jp/daily/english/03_19.html

TEPCO now says that the radioactive krypton they found was due to spontaneous fission of curium.

D. Pulaski

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Wednesday Update

From NEI’s Japan micro-site: NRC, Industry Concur on Many Post-Fukushima Actions Industry/Regulatory/Political Issues • There is a “great deal of alignment” between the U.S. Nuclear Regulatory Commission and the industry on initial steps to take at America’s nuclear energy facilities in response to the nuclear accident in Japan, Charles Pardee, the chief operating officer of Exelon Generation Co., said at an agency briefing today. The briefing gave stakeholders an opportunity to discuss staff recommendations for near-term actions the agency may take at U.S. facilities. PowerPoint slides from the meeting are on the NRC website. • The International Atomic Energy Agency board has approved a plan that calls for inspectors to evaluate reactor safety at nuclear energy facilities every three years. Governments may opt out of having their country’s facilities inspected. Also approved were plans to maintain a rapid response team of experts ready to assist facility operators recoverin