軽水炉シビアアクシデント時のCsと鋼材との化学吸着挙動,1; 600C付近における鋼材へのCs化学吸着挙動に関する実験的研究

Cs chemisorption behaviour onto stainless steel during LWR severe accident, 1; Experimental study on Cs chemisorption behaviour at temperature around 600C

鈴木 恵理子   ; 高瀨 学; 中島 邦久  ; 西岡 俊一郎; 逢坂 正彦  

Suzuki, Eriko; Takase, Gaku; Nakajima, Kunihisa; Nishioka, Shunichiro; Osaka, Masahiko

軽水炉シビアアクシデント(SA)時の炉内のCs分布・性状評価において重要なステンレス鋼へのCs化学吸着挙動について、これまでの調査よりも比較的低温である600C付近の挙動の実験的研究を行った。その結果、Cs化学吸着によりCs-Fe-O化合物が生成し、Cs-Si-(Fe)-O化合物が生成する800C以上の高温域とは異なる化学反応が生じる可能性が示唆された。

In order to estimate the cesium (Cs) distribution in the reactor pressure vessel under severe accident (SA), Cs chemisorption behaviour onto stainless steel have been investigated. In our previous study on Cs chemisorption behaviour at above 800C, it was found that the Cs silicate compounds were formed as Cs chemisorbed compounds. In this study, Cs chemisorption tests at lower temperatures around 600C were carried out to investigate the Cs chemisorbed compounds at lower temperatures. As a result, cesium ferrate compounds were formed and it was suggested that the chemical reaction at lower temperatures would be different from that at above 800C.