Professor at Kyoto University’s nuclear institute changes mind: I’ve started to think fission has happened again… re-criticality

Published: April 6th, 2011 at 11:37 pm ET
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Akira Hiroshi Koide reactor Kyoudai “critical potential” re-listen cause full text, MBS Mainichi Broadcasting (Osaka), April 6, 2011:

via EX-SKF (Koide “now says the Reactor 1 may be experiencing the “recriticality”)

Interview with Professor Akira Hiroshi Koide, Kyoto University’s Research Reactor Institute (NOT the literal translation. That is available here via Google)

[Emphasis Added]

“The Fukushima I Nuke Plant accident is not winding down at all. I think I have to revise my opinion which was too optimistic.”

[Host:] What was too optimistic?

We thought the reactors “cold stopped”, which means the uranium fission stopped. But now I’ve started to think the fission has started again. In other words, the reactor has become “critical” again – which we call “recriticality“.”

[Host:] Professor Koide, you were of the opinion that the recriticality was not happening.

“Yes, and I’ve changed my mind. It may be happening.” …

“First, the level of iodine[-131] is not decreasing; it is increasing. Iodine[-131]‘s half life is 8 days. It has been more than 3 weeks since the accident, so the level of iodine[-131] should be about 1/10 of the initial level measured. Second, the presence of chlorine-38 was detected from the contaminated water in the turbine building [he doesn't say which one].” …

“Well, if chlorine-38 was detected [according to TEPCO], and that can only mean “recriticality”. …

Report continued here.

Published: April 6th, 2011 at 11:37 pm ET
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Related Posts

  1. NYTimes: For first time Tepco admits “fuel deep inside 3 stricken plants probably continuing to experience bursts of fission” — Fission at Reactors 1 and 3 also? November 2, 2011
  2. New fission raises “startling questions” says NYT — Koide: Harmful radioactive material in danger of leaking after a re-criticality November 2, 2011
  3. Boric acid apparently not working to stop chain fission reactions because Xenon is still being detected — Tepco says this is reason why they claim ‘spontaneous’ fission, not sustained criticality November 3, 2011
  4. Busby: On-going fission is occurring at Fukushima — Either a recent “enriched uranium fission” or an “explosive criticality” November 6, 2011
  5. Yomiuri: Former Japan PM ‘hints’ of recriticality at Fukushima — Found Chlorine-38 in Reactor No. 1 water tested at research institute December 16, 2011

5 comments to Professor at Kyoto University’s nuclear institute changes mind: I’ve started to think fission has happened again… re-criticality

  • John

    many people have been warning this weeks ago one of them Arnie Gundersen (http://vimeo.com/21881702)


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  • xdrfox

    Why would anyone have thought this was winding down, the steady lights of blue beams have been being ongoing throughout the duration of this calamity, plutonium blow to kingdom come for miles around with a half-life of at least 125,000 years !


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  • xdrfox

    Japan bans planting rice in radioactive soil
    TOKYO – Fears of radiation spread to rice as the planting season began in Japan, prompting the government to ban its cultivation in contaminated soil as fallout…
    http://news.yahoo.com/s/ap/20110409/ap_on_bi_ge/as_japan_earthquake

    End to Japan nuke crisis is years, a fortune away
    “The best solution is to entomb the site for 40, 50, 60 years,” said Arnold Gundersen, who wrote part of the Energy Department manual on decommissioning and runs the U.S.-based environmental consulting company Fairewinds Associates.
    http://news.yahoo.com/s/ap/20110409/ap_on_re_us/as_japan_earthquake_nuclear_endgame


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  • xdrfox

    Event at Hanford Nuclear Plant Washington state.
    RICHLAND, Wash. — A spokesman for a Washington nuclear power plant says a small amount of hydrogen gas trapped in a pipe ignited in a brief, six-inch flame Thursday when workers cut into the pipe.

    ‘Unusual Event’ Declared At Hanford Nuclear Plant

    POSTED: 10:40 pm PDT April 7, 2011

    facebookdel.icio.usbuzzdiggreddit›› Email›› PrintRICHLAND, Wash. — A spokesman for a Washington nuclear power plant says a small amount of hydrogen gas trapped in a pipe ignited in a brief, six-inch flame Thursday when workers cut into the pipe.

    Energy Northwest spokesman Mike Paoli says no one was injured and no equipment was damaged in the “puff,” which he says lasted less than a second. Still, the Columbia Generating Station declared an “unusual event” and temporarily evacuated the immediate area. Plant officials also notified the Nuclear Regulatory Commission.

    Paoli says the pipe is located in the plant’s main turbine building, which is a non-nuclear area. The plant is located on the Hanford nuclear reservation in …..READ MORE…
    http://www.kptv.com/news/27474617/detail.html


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  • xdrfox

    Washington state nuclear plant briefly evacuated

    SEATTLE, April 8 | Fri Apr 8, 2011 4:47pm EDT

    SEATTLE, April 8 (Reuters) – Washington state’s only nuclear power plant briefly evacuated about 25 workers after a small amount of hydrogen sprang from a pipe and ignited in a six-inch (15.5 cm) flash, plant officials said on Friday.

    The incident at the Columbia Generating Station late on Thursday afternoon resulted in….

    http://www.reuters.com/article/2011/04/08/nuclear-usa-plant-idUSN0810220110408


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