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硝酸/海水系におけるSUS316Lの腐食に及ぼす放射線の影響

Irradiation effect on corrosion behavior of SUS316L in nitric acid solution containing seawater components

佐野 雄一  ; 安倍 弘 ; 西塚 雄介*; 飯嶋 静香; 内田 直樹

Sano, Yuichi; Ambai, Hiromu; Nishizuka, Yusuke*; Iijima, Shizuka; Uchida, Naoki

核燃料再処理工程の各種機器材料として使用されるSUS316Lを対象に、海水成分を含む硝酸溶液中における腐食挙動に及ぼす$$gamma$$線照射の影響を評価した。硝酸/海水系において観察される溝状腐食や浸漬直後の急激な全面腐食等の特徴的な腐食の進展は$$gamma$$線照射に伴い抑制されることを確認した。同系において発生する塩素について、$$gamma$$線照射に伴いその発生量が減少する傾向が認められたことから、これが上記腐食の抑制に寄与したものと推定される。

The effect of $$gamma$$-ray irradiation on the corrosion behavior of SUS316L stainless steel, which is a typical material for the equipment used in reprocessing, in HNO$$_{3}$$ solution containing seawater components was investigated. Severe corrosion just after immersion and thin streaks of corrosion, which are observed in HNO$$_{3}$$ solution containing seawater components, were prevented by $$gamma$$-ray irradiation. The generation of Cl$$_{2}$$ was decreased by $$gamma$$-ray irradiation, and it would suppress the corrosion progress.

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