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高温水中のステンレス鋼すき間部での腐食に及ぼす$$gamma$$線の影響

Effect of $$gamma$$-ray irradiation on corrosion of crevice portion of stainless steel in high temperature water

山本 正弘 ; 中原 由紀夫 ; 加藤 千明  ; 塚田 隆 ; 和田 陽一*; 布施 元正*

Yamamoto, Masahiro; Nakahara, Yukio; Kato, Chiaki; Tsukada, Takashi; Wada, Yoichi*; Fuse, Motomasa*

軽水炉などでは、水が放射線により分解され酸化剤が生成する。これらの生成反応は金属表面でバルク水よりも多く生成することが予測される。さらにすき間形状部では拡散が阻害されて濃化することが考えられる。これらの影響を明らかにするために、すき間有無のステンレス鋼試験片を高温水中で$$gamma$$線照射を行い、腐食に及ぼす影響を皮膜解析により明らかにした。これらの皮膜の組成と酸化剤の拡散の影響を計算により評価した。

Oxidants, such as hydrogen peroxide, are created by radiolysis of water in the light water reactor. It is easily estimated that the reactions are accelerated rather on the metal surface than the bulk water. Furthermore, a crevice portion concentrates more oxidants because of retardation of diffusion of them. Stainless steel samples having crevices were examined to clarify the effects of $$gamma$$ ray irradiation on corrosion at crevice portion. Difference of corrosion features were determined by some surface analytical techniques. And the effect of diffusion process of oxidants in the crevice was evaluated by calculation using FEM method.

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