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炉心物質のペデスタル移行挙動に着目した1Fプラントデータの分析

Fukushima-Daiichi plant data analysis focusing on core material relocation to pedestal

佐藤 一憲 ; 吉川 信治 

Sato, Ikken; Yoshikawa, Shinji

福島第一原子力発電所1$$sim$$3号機では、燃料をはじめとする炉心物質の一部が原子炉圧力容器(RPV)を破ってペデスタル領域に落下した。圧力計, 水位計などのデータを総合的に分析し、炉心物質のペデスタルへの主要な落下時間を評価した結果、1号機は0.5hr以下、2号機は2.5hr程度、3号機は7hr程度と推定された。

In Fukushima Daiichi Nuclear Power Station Units 1-3, some part of the core materials including fuel relocated through the reactor pressure vessel (RPV) into the pedestal area. As a result of comprehensive analysis of data such as pressure gauges and water level gauges,it was evaluated that the time duration of the core material relocation to the pedestal was, less than 0.5 hr for Unit 1, around 2.5 hours for Unit 2 and around 7 hours for Unit 3 respectively.

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