http://fukushima-diary.com/2012/05/tepco-removing-2-fuel-assemblies-from-reactor4/
東電、未使用燃料を試験取り出し 福島原発保管プールから
http://ex-skf.blogspot.com/2012/05/us-nrcs-information-on-spent-fuel.html
Since there are many experts who urge removing the spent fuel assemblies from the Reactor 4 Spent Fuel Pool at Fukushima I Nuclear Power Plant and into dry cask storage as soon as possible, I checked what the US regulatory agency of the nuclear power industry says about spent fuel storage to find out how soon is "as soon as possible".
The minimum the NRC has authorized is 3 years, 5 years normal, industry norm 10 years.
From NRC's webpage "Spent Fuel Storage in Pools and Dry Casks: Key Points and Questions & Answers" (part):
http://fukushima-diary.com/2012/05/actual-fukushima-worker-in-case-of-the-major-aftershock-all-the-reactors-will-be-in-crisis/
http://enenews.com/former-fukushima-daiichi-worker-tepco-screwed-up-by-admitting-its-preparared-to-spray-concrete-on-fuel-pool-they-are-really-admitting-they-know-that-it-might-collapse
Tepco removing 2 fuel assemblies from reactor4
Posted by Mochizuki on May 27th, 2012 · No Comments
Tepco is attempting to remove 2 assemblies from reactor 4 around in July for a test.
The assemblies are new ones, which are not fissioning to heat supposedly. They plan to check the damage to the fuel assemblies and how to stock.
The assemblies are new ones, which are not fissioning to heat supposedly. They plan to check the damage to the fuel assemblies and how to stock.
There are 783 assemblies of spent fuel, 548 assemblies of the fuel taken out of the reactors and 204 assemblies of new fuel. They are starting to remove the rest of the fuels in 2013.
東電、未使用燃料を試験取り出し 福島原発保管プールから
東京電力が福島第１原発４号機の使用済み核燃料プールに保管している未使用の燃料２体を、７月前後に試験的に取り出す方向で検討していることが２７日、分かった。
未使用の燃料は使用済み燃料と異なり、核分裂をしていないため発熱せず、危険性は小さい。取り出した燃料の損傷の程度を確認し、今後の保管方法などを検討する。
昨年３月の事故時、４号機は定期検査中で、原子炉建屋５階の燃料プールには使用済み燃料７８３体、原子炉から取り出した燃料５４８体、未使用の燃料２０４体の計１５３５体が入っていた。政府と東電は廃炉に向け、２０１３年にこれらの燃料の取り出しを始める計画。
2012/05/27 19:54 【共同通信】
Source
Source
http://ex-skf.blogspot.com/2012/05/us-nrcs-information-on-spent-fuel.html
SATURDAY, MAY 26, 2012
US NRC's Information on Spent Fuel Storage
Since there are many experts who urge removing the spent fuel assemblies from the Reactor 4 Spent Fuel Pool at Fukushima I Nuclear Power Plant and into dry cask storage as soon as possible, I checked what the US regulatory agency of the nuclear power industry says about spent fuel storage to find out how soon is "as soon as possible".
The minimum the NRC has authorized is 3 years, 5 years normal, industry norm 10 years.
From NRC's webpage "Spent Fuel Storage in Pools and Dry Casks: Key Points and Questions & Answers" (part):
and....1. All U.S. nuclear power plants store spent nuclear fuel in “spent fuel pools.” These pools are robust constructions made of reinforced concrete several feet thick, with steel liners. The water is typically about 40 feet deep, and serves both to shield the radiation and cool the rods.
2. As the pools near capacity, utilities move some of the older spent fuel into “dry cask” storage. Fuel is typically cooled at least 5 years in the pool before transfer to cask. NRC has authorized transfer as early as 3 years; the industry norm is about 10 years.
3. The NRC believes spent fuel pools and dry casks both provide adequate protection of the public health and safety and the environment. Therefore there is no pressing safety or security reason to mandate earlier transfer of fuel from pool to cask.The Reactor 4 Spent Fuel Pool contains fuel assemblies that were removed from the reactor core when the unit went into regular maintenance that included replacing the core shroud on November 30, 2010. The maintenance was to last until September 24, 2011 (299 days). There were 548 fuel assemblies in the reactor core at that time. (Information from TEPCO's press release, 11/29/2010)
Assuming that the fuel assemblies were removed from the core soon after the start of the maintenance and put into the SFP, say sometime in December 2010, they have been cooled in the SFP for about one and a half years by now. Another one and a half years to go, then, to reach the minimum that the NRC would authorize the removal from the SFP to dry casks.
TEPCO/Japanese government's current plan seems to be to move the older fuel assemblies in the Common Spent Fuel Pool into dry casks to make room for the Reactor 4 SFP fuel assemblies.
http://fukushima-diary.com/2012/05/actual-fukushima-worker-in-case-of-the-major-aftershock-all-the-reactors-will-be-in-crisis/
Actual Fukushima worker “In case of the major aftershock, all the reactors will be in crisis”
Posted by Mochizuki on May 26th, 2012 · 3 Comments
Following up this article..Tepco has no clue for the worst senario of SFP4
Actual Fukushima worker Happy11311 admits if another major aftershock hits Fukushima, they can’t even get close to the reactors and the risk is not only SFP4, it would be all the reactors.
and......
http://enenews.com/former-fukushima-daiichi-worker-tepco-screwed-up-by-admitting-its-preparared-to-spray-concrete-on-fuel-pool-they-are-really-admitting-they-know-that-it-might-collapse
Chris Canine on Unit 4 (Health Physics Technician, Chemist and Radiation Safety Instructor with 15 years experience. He has worked at over 20 plants throughout the United States, Japan and Mexico — including Fukushima #1 and #2 in the late 1970′s)
May 26, 2012 at 10:24 am
May 26, 2012 at 10:24 am
If the building is standing they can spray water on the pool and maintain some kind of cooling, enough to get by, especially now that the pool is cooler than 14 months ago.
The concrete mixture idea can only be in response to a fuel pool collapse. So they are really admitting they know that it might collapse!! It is a completely crazy idea, those who have said the building would collapse if sprayed [with concrete-like mixture] in a standing pool are correct. But the idea was only generated if the building falls down on the ground. Then this idea might be better than doing nothing with fuel laying on the ground because it would slow the release of radioactive material. But it would mean that this pile would forever be dangerous and some releases would continue for years.What a “Hail Mary” this is. TEPCO screwed up by admitting this, there have been several stories the last few days that are illuminating much more.
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