Experimental studies on Cs chemisorption on reactor structural materials and their behaviour at high temperature

圧力容器構造材へのセシウム化学吸着・高温挙動評価

鈴木 恵理子   ; Di Lemma, F. G.; 中島 邦久  ; 山下 真一郎   ; 逢坂 正彦  

Suzuki, Eriko; Di Lemma, F. G.; Nakajima, Kunihisa; Yamashita, Shinichiro; Osaka, Masahiko

シビアアクシデント(SA)時において圧力容器構造材へ吸着したセシウム(Cs)化合物の再蒸発挙動を明らかにするためにCsが吸着した異なるステンレス鋼の1000Cでの再加熱実験及び微細組織観察を行った。鋼材にMoが含まれる場合、Cs-Fe-Si-O化合物に加え、Cs-Mo-O化合物が表面層に生成され、1000CにおいてはCs-Fe-Si-O化合物よりも再蒸発しやすいことが示された。

In order to clarify the re-vaporization behavior of cesium (Cs) chemisorbed compounds which formed onto reactor structural materials during Severe Accident (SA), Cs chemisorbed samples were reheated at 1000C and then microstructural analysis of the chemisorbed samples was conducted. In the case of stainless steel containing Mo, Cs-Mo-O compounds were formed on surface, together with major Cs-Fe-Si-O compounds, and re-vaporized easier than Cs-Fe-Si-O compounds at 1000C.