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硝酸溶液中のステンレス鋼の腐食に及ぼすネプツニウムイオンの影響

Effect of neptunium ions on corrosion of stainless steel in nitric acid solution

本岡 隆文; 石川 明義; 沼田 正美; 遠藤 慎也; 糸永 文雄; 木内 清; 木崎 實

Motooka, Takafumi; Ishikawa, Akiyoshi; Numata, Masami; Endo, Shinya; Itonaga, Fumio; Kiuchi, Kiyoshi; Kizaki, Minoru

硝酸溶液中のステンレス鋼の腐食に及ぼすネプツニウムイオンの影響を腐食試験により評価した。9規定硝酸溶液にネプツニウムイオンを含有する試験液を用いて、SUS304L鋼の試験材を浸漬及び伝熱条件で腐食試験を実施した。その結果、ネプツニウムイオンによりステンレス鋼の腐食が促進されることを見いだした。この知見は、再処理プロセスにおける材料の検討に資されると期待される。

An effect of neptunium ions on corrosion of stainless steel in nitric acid solution was investigated by corrosion tests. Type SUS304L stainless steel was used for the tests. The corrosion tests were conducted in 9kmol/m$$^{3}$$ nitric acid solutions containing neptunium ions, where test specimens were immersed or heat-transferred. As a result, we found that neptunium ions promote corrosion of stainless steels in nitric acid solution. This finding would contribute to modifications of the materials for spent fuel reprocessing process.

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