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高速炉燃料被覆管用ODS鋼の耐スエリング性評価

Swelling resistance of ODS steel for fuel cladding tube of fast reactor

丹野 敬嗣  ; 岡 弘*   ; 矢野 康英  ; 大塚 智史   ; 皆藤 威二 

Tanno, Takashi; Oka, Hiroshi*; Yano, Yasuhide; Otsuka, Satoshi; Kaito, Takeji

原子力機構が開発を進める、ODS鋼を含めた高速炉燃料被覆管候補材料にFe+Heデュアルイオンビーム照射を実施し、耐スエリング性を評価した。オーステナイト鋼やODS鋼ではない焼戻しマルテンサイト鋼では粗大なボイドにより大きくスエリングしたのに対し、ODS鋼は約95dpa照射後もスエリングは極めて小さく、酸化物分散粒子の高いスエリング抑制効果が明らかとなった。

Fe + He dual ions beam irradiation to ODS steels and other materials which are developed as the candidates for fuel cladding tubes of fast reactor was carried out in order to evaluate their swelling resistance. Austenitic steels and tempered martensitic steels, which are not ODS, were swelled due to coarse voids formation by the irradiation. On the other hand, the swelling of ODS steels was much smaller than the others after irradiation up to 95 dpa. The fact shows that the fine dispersed oxide in ODS steels can suppress the swelling strongly.

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