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Evaluation of plant behavior during the accident at Fukushima Daiichi Nuclear Power Station

Evaluation of plant behavior during the accident at Fukushim...

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作者： MIYATA Koichi nishino shoichiro Tokyo Electric Power Company

The Great East Japan Earthquake that occurred at 14:46 on March 11,2011,caused all off-site power to be lost at Fukushima Daiichi Nuclear Power Station（NPS）,but the emergency diesel generators（EDGs） started up,and the electric power necessary for reactor safety was *** 15:27 the first tsunami was observed,which far exceeded the design basis of the power plant and caused the loss of almost all safety functions of core cooling and *** a result,the reactor core was damaged in Units 1 to 3,and hydrogen explosions destroyed the reactor buildings（R/Bs） of Units 1,3 and ***,since the spent fuel pool（SFP） cooling was also lost,external water was injected into the *** Units 1 and 3,since depressurization of primary containment vessel（PCV） through the vent from suppression chamber（S/C） was completed,release of radioactive materials was *** the other hand the PCV vent was not successful in Unit *** data rose sharply before noon on March 15 when Unit 2 PCV pressure dropped considerably and steam was seen coming from Unit 2 R/*** blowing toward the north-northwest direction prevailed that day and rain fell in that direction at night,so it is likely that the contamination in high contamination zones around the plant resulted from a release of radioactive materials from Unit 2 R/B on March *** the field surveys and the design of the PCV,it is expected that the leak might have occurred at the seal of the PCV top head *** addition,as a result of evaluating the release of radioactive materials,the vent operations and the explosions at the R/Bs were not considered a major cause of contamination.

关键词： core damage MAAP hydrogen explosion release of radioactive materials

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