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Effect of $$gamma$$-ray irradiation on corrosion of low alloy steel in neutral water

中性水中での低合金鋼の腐食に及ぼす$$gamma$$線照射の影響

山本 正弘; 中野 純一; 小松 篤史; 佐藤 智徳; 塚田 隆

Yamamoto, Masahiro; Nakano, Junichi; Komatsu, Atsushi; Sato, Tomonori; Tsukada, Takashi

福島第一原子力発電所事故対応において、圧力容器や格納容器の腐食が重要な課題である。現状不確定な要因としてこれらの金属の腐食に対する放射線の影響がある。そこで、$$gamma$$線照射下でのこれらの金属の腐食試験を実施した。また、試験後の酸素や過酸化水素量も測定した。試験結果より、放射線の影響で腐食量が増加すること、また腐食と酸素や過酸化水素の量が対応していることが明らかになった。さらに、電気化学的試験より、過酸化水素の拡散係数は酸素の0.75倍であり、酸素と過酸化水素量より腐食速度が予測可能であることが分かった。

Corrosion protection of RPV and PCV is an important issue for the long term maintenance until the end of the decommissioning procedures. One of the uncertain factors for the issue is an effect of radioactivity on corrosion of LAS and CS. Corrosion tests using LAS and CS were conducted in $$gamma$$-rays irradiated condition. Oxygen and hydrogen peroxide concentrations in the water were measured after the tests. Corrosion test results indicated that the amounts of corrosion increased by $$gamma$$-rays irradiation both air and nitrogen atmosphere. And also corrosion amounts increased with $$gamma$$-ray dose rates. Electrochemical analyses indicated that cathodic reaction of Hydrogen peroxide was controlled by diffusion process. The measured diffusion constant of H$$_{2}$$O$$_{2}$$ was about 0.75 times to that of oxygen. From these results, it is estimated that corrosion of LAS and CS in $$gamma$$-ray irradiated condition was evaluated by the cathodic reduction reaction of oxidant.

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