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原子炉構造材へのセシウム化学吸着・再蒸発挙動評価

Experimental studies on Cs chemisorption on reactor structural materials and their re-vaporization behavior

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)時に圧力容器構造材への化学吸着により生成したセシウム(Cs)化合物の再蒸発挙動を明らかにするために、成分が異なるステンレス鋼に吸着したセシウム化合物の1000$$^{circ}$$Cでの再加熱実験を行い、加熱実験前後の試料の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ること、後者はCs-Fe-Si-O化合物よりも再蒸発しやすいことが分かった。

In order to clarify the re-vaporization behavior of caesium (Cs) chemisorbed compounds which formed onto reactor structural materials during Severe Accident (SA), Cs chemisorbed samples were reheated at 1000$$^{circ}$$C 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 1000 $$^{circ}$$C.

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