FUKUSHIMA Report (1):
|Japanese page: 'Core problem in the TEPCO nuclear plant accident -- Similarity with the JR West train accident at Amagasaki', by Eiichi Yamaguchi (Doshisha Univ.), Talk on Feb. 26, 2013|
|Posted on Sept. 20, 2013|
|==> See: FUKUSHIMA Report (2): The actual reason why this accident could not have been avoided, by Eiichi Yamaguchi (Doshisha Univ.), Presented at ISIS2012 (posted on Oct. 3, 2013)|
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Editor's Note (Toru Nakagawa, Sept. 17, 2013)
In the Japanese page, I am posting an article 'Core problem in the TEPCO nuclear plant accident -- Similarity with the JR West train accident at Amagasaki', by Prof. Eiichi Yamaguchi (Doshisha Univ.). I noticed the article published in a recent issue of Bulletin of YMCA, The University of Tokyo. The article was written down by Professor Yamaguchi on the basis of his talk at the YMCA on Feb. 26, 2013. On my request, Prof. Yamaguchi has allowed me to post here (a) the article in Japanese , (b) slides of the talk in Japanese , and (c) slide in English presented at a news release in Nov. 2011.
On the Fukushima nuclear plant accident, it is widely known that four mutually independent teams investigated and reported. They are:
(1) 'Minkan Jikocho': Voluntary independent group headed by Dr. Koichi Kitazawa, report of 412 pages in Japanese on Mar. 11, 2012.
(2) 'TEPCO Jikocho': Investigation committee inside TEPCO, interim report on Dec. 2, 2011 and final report on Jun. 20, 2012.
(3) 'Diet Jikocho': Investigation committee organized by the Diet and headed by Mr. Kiyoshi Kurokawa, report on Jul. 5, 2012.
(4) 'Government Jikocho': Investigation committee organized by the Government and headed by Prof. Yotaro Hatamura, interim report on Dec. 26, 2011, final report on Jul. 23, 2012.
Prof. Eiichi Yamaguchi has lead another team for investigation, i.e.
(5) 'Grass-root Jikocho': Fukushima Project, a voluntary independent group headed by Prof. Eiichi Yamaguchi, report of 503 pages on Jan. 30, 2012.
As sumamrized in the present news release in English, his Project has revealed an importatnt aspect how and why the reactors lost the control to make the accident so disastrous. This pointing is important, I think, because the four other 'Jikochos' do not mention this point clearly.
Note (T. Nakagawa, Oct. 3, 2013): Prof. Yamaguchi's presentation in English at ISIS2012 is now posted .
|Book Cover published in Japanese|
|Title page of this News Release|
Structure of Reactors No. 2 and No. 3:
Graph presented by TEPCO.
Even after the station black-out due to the tsunami attack at 15:28 on March 11, 2011, "the last fort" RCIC and sequentially HPCI kept cooling the reactor core of Unit 3 very well, which was hence in a controllable state for 35 hours until 02:44 on March 13.
Graph presented by TEPCO.
Even after the station black-out due to the tsunami attack at 15:28 on March 11, 2011, "the last fort" RCIC kept cooling the reactor core of Unit 2 very well, which was hence in a controllable state for 70 hours until 13:22 on March 14.
|Yasushi HIBINO (Executive Vice-President of JAIST) testified that, in the evening on March 12, he and Prime Minister Naoto KAN strongly requested the management of TEPCO to make a decision of injecting sea water into the reactor pressure vessel after opening the vent as soon as possible within this controllable state. However, the management of TEPCO politely refused the request. Finally, TEPCO injected sea water at 09:25 on March 13, more than six hours after making the reactor uncontrollable. This refusal finally resulted in the majority of radioactive pollution. Precisely the same thing happened with Unit 2.|
See: FUKUSHIMA Report (2): The actual reason why this accident could not have been avoided, by Eiichi Yamaguchi (Doshisha Univ.), Presented at ISIS2012 (posted on Oct. 3, 2013)
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Last updated on Oct. 3, 2013. Access point: Editor: email@example.com