Skip to main content

Wednesday Update

By

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.
Labels:

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.
November 3, 2011 at 11:11 AM
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
November 3, 2011 at 9:55 PM
Post a Comment

Popular posts from this blog

Activists' Claims Distort Facts about Advanced Reactor Design

By
Below is from our rapid response team . Yesterday, regional anti-nuclear organizations asked federal nuclear energy regulators to launch an investigation into what it claims are “newly identified flaws” in Westinghouse’s advanced reactor design, the AP1000. During a teleconference releasing a report on the subject, participants urged the Nuclear Regulatory Commission to suspend license reviews of proposed AP1000 reactors. In its news release, even the groups making these allegations provide conflicting information on its findings. In one instance, the groups cite “dozens of corrosion holes” at reactor vessels and in another says that eight holes have been documented. In all cases, there is another containment mechanism that would provide a barrier to radiation release. Below, we examine why these claims are unwarranted and why the AP1000 design certification process should continue as designated by the NRC. Myth: In the AP1000 reactor design, the gap between the shield bu...
23 comments
Read more

What Happens During a Refueling Outage?

By
You may have noticed over the past few weeks that a number of nuclear plants are shut down for refueling outages or are resuming operations after just returning from one. This type of routine outage usually occurs in the spring or fall when electricity demand is low so that nuclear reactors can replace about one-third of the spent fuel rods with new fuel and conduct other routine maintenance and repairs at the plant. To get a better sense of how refueling works at a nuclear energy facility, I spoke with Marcus Nichol, NEI’s senior project manager for used fuel storage and transportation, and asked him to explain the basics. Why does a nuclear plant need to replace one-third of its fuel? Nichol: The main purpose of a refueling outage is to replace older fuel that is depleted—meaning it can no longer efficiently produce energy from nuclear fission reactions—with new fuel. This “used fuel” has typically been used in the reactor for four-and-a-half to six years before it is pe...
6 comments
Read more

How Much Land Does Nuclear, Wind and Solar Really Need?

By
Not too long ago, we reviewed a report that looked at nuclear energy (and other energy sources) as biodiversity agents. This had to do, in part, with the amount of land a facility needs to function. Nuclear energy and fossil fuel plants use relatively little, wind farms and solar arrays quite a lot of land . Based on an objective and transparent analysis of our sustainable energy choices, we have come to the evidence-based conclusion that nuclear energy is a good option for biodiversity conservation (and society in general) and that other alternatives to fossil fuels should be subjected to the same cost–benefit analyses (in terms of biodiversity and climate outcomes, as well as sociopolitical imperatives) before accepting or dismissing them. Writer Barry Brook, who collected 75 scientists to endorse his paper, is interested in land use as it impacts flora and fauna. Biodiversity concerns do not get as much play as they might – and, when they do, it annoys many when land is withdraw...
4 comments
Read more