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A Consideration on experimental needs for clarification of core-material relocation behavior in BWR severe accident

BWRシビアアクシデント時の炉心物質移動挙動の解明のための試験ニーズに関する考察

佐藤 一憲 

Sato, Ikken

BWRシビアアクシデント時の炉心物質移動挙動に関わる試験ニーズを既存の試験データベースに基づいて検討した。この結果、溶融炉心物質が当初の炉心部から下部プレナムに移行するフェーズがBWR特有の構造に依存すると考えられるものの、極めて限定的な既存の試験データでは不十分であり、このような移行過程のより良い理解のためには将来的な試験研究が必要であるとの認識を得た。

Experimental needs for clarification of core-material relocation behavior during BWR severe accident are studied based on existing experimental database. It is understood that relocation of molten core materials from the original core region into the lower plenum is dependent on the structural characteristics of BWR. Existing experiments are quite limited for this behavior and future experiments are necessary for better understanding. Possible experiments to fill the experimental needs are proposed.

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