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Effect of water radiolysis on surface oxide film formed on SUS316L in $$gamma$$-ray irradiated high temperature water

$$gamma$$線照射下高温水中でのSUS316L鋼の酸化皮膜に及ぼす水の放射線分解の影響

山本 正弘; 加藤 千明; 佐藤 智徳; 中原 由紀夫; 塚田 隆; 渡辺 淳史*; 布施 元正*

Yamamoto, Masahiro; Kato, Chiaki; Sato, Tomonori; Nakahara, Yukio; Tsukada, Takashi; Watanabe, Atsushi*; Fuse, Motomasa*

軽水炉の腐食で大きな課題である応力腐食割れ(SCC)に関して溶存酸素(DO)との関係で多くの研究がなされている。しかし、実際の炉では冷却水の放射線分解により生成する化学種の影響が重要であるが、それについてはあまり検討されていない。さらに、すきま形状部では、放射線分解生成物の影響も複雑であるため、隙間を付与したSUS316L鋼を$$gamma$$線照射下の高温水中で腐食試験し、その後に表面の酸化皮膜を詳細解析した。また、すきま部で生成する放射線分解化学種の計算結果と合わせ隙間部で起こる複雑な反応に関して考察した。

Major corrosion problems of light water reactor (LWR) which are represented by stress corrosion cracking are affected by dissolved oxygen (DO) concentration in feed water. Many corrosion tests were conducted with the parameter of DO values. Oxygen source of an actual LWR is radiolysis of cooling water and also H$$_{2}$$O$$_{2}$$ is generated. The effect of these species created by water radiolysis to corrosion of structural material was not sufficiently examined. $$gamma$$-ray irradiated experiments were conducted in high temperature water condition using type 316L stainless steels with crevice. The calculation of radiolysis products was not estimated by the effect of radiolysis products. From these results, much complicated reaction seemed to occur at the $$gamma$$-ray irradiated crevice portion.

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