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Effect of $$gamma$$ ray irradiation on the corrosion of stainless steel in supercritical water

超臨界水中でのステンレス鋼の腐食に対する$$gamma$$線照射の影響

中原 由紀夫 ; 唐澤 英年*; 山本 正弘 ; 木内 清; 勝村 庸介*

Nakahara, Yukio; Karasawa, Hidetoshi*; Yamamoto, Masahiro; Kiuchi, Kiyoshi; Katsumura, Yosuke*

先進炉の一つとして、超臨界圧水冷却炉(SCWR)が検討されている。SCWR炉心でのステンレス鋼の腐食に放射線が及ぼす影響について知見を得るため、超臨界水(25MPa, 400$$sim$$500$$^{circ}$$C)中でステンレス鋼の$$gamma$$線照射下腐食試験を実施した。その結果、超臨界水中でのステンレス鋼の腐食は酸化皮膜の成長と剥離で進行し、その腐食速度はアレニウス則によりほぼ説明でき、$$gamma$$線照射は酸化皮膜の組成を変化させた。

A supercritical water-cooled nuclear reactor (SCWR) has been under review as one of advanced reactors. Corrosion tests of several types of stainless steel in supercritical water (25MPa, 400$$sim$$500$$^{circ}$$C) were executed under $$gamma$$ ray irradiation in order to clarify the effect of $$gamma$$ ray on the corrosion. The results of the tests shows that the corrosion of stainless steel was progressed by the growth and degradation of surface oxide film, the dependence of the parabolic rate law constant on temperature can be fit with Arrhenius' equation, $$gamma$$ ray irradiation changed the property of surface oxide film.

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