軽水炉重大事故時におけるCsと鋼材の化学反応の評価,1; Cs吸着量に及ぼす温度および雰囲気の影響

Cs chemical reaction with stainless steel under a LWR severe accident, 1; Effect of temperature and atmosphere on Cs chemisorbed amounts

鈴木 恵理子   ; 西岡 俊一郎; 中島 邦久  ; 逢坂 正彦  

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

軽水炉重大事故時に想定される様々な条件下における、Csのステンレス鋼への化学吸着挙動評価のために、温度・雰囲気をパラメータとしてCs化学吸着実験を行った。その結果、特に試験雰囲気中の水蒸気の有無によって、Cs吸着量や吸着生成物からのCs再蒸発挙動が異なることが観察され、Cs化学吸着挙動が温度のみならず雰囲気に大きく影響を受けることが分かった。

In order to clarify the behaviour of Cs chemisorption onto stainless steel under various LWR severe accident conditions, simulated Cs chemisorption tests, the parameters were temperature and atmosphere, were performed. As a results, it was observed that Cs chemisorbed amounts and Cs revaporization behaviour from Cs chemisorbed compounds were different between the atmosphere containing HO or not. It means that Cs chemisorption behaviour is greatly affected by not only temperature but also atmosphere.