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再処理施設分析廃液配管の腐食原因の調査

Investigation into corrosion cause of the reprocessing facilities analysis waste fluid plumbing

田中 直樹; 諏訪 登志雄; 西田 直樹; 久野 剛彦; 伊波 慎一

Tanaka, Naoki; Suwa, Toshio; Nishida, Naoki; Kuno, Takehiko; Inami, Shinichi

東海再処理施設の分析廃液を排水する放射性溶液配管の腐食部から漏えいが発生した。この腐食の原因の調査として当該配管を切出し、腐食部について分析・観察を行った。その結果、過去に使用した塩素系分析試薬の塩化物イオンが原因となり、局部腐食を起こしたことが考えられる。そのため、塩素系分析試薬の使用履歴のある配管についてフェーズドアレーによる配管の点検を行ったので結果について報告する。

Corroded pore was found at stainless pipe for liquid waste solution from the analytical laboratory. In order to find out the cause of corrosion, analytical samples were prepared cutting from the pipe. Reagents contained chloride, which had been used analytical laboratory more than ten years before the date, were found to be the trigger of the localized corrosion. We checked up all the pipes, which have been wasted including chloride solutions, by phased array instrument. We report the investigation of cause of corrosion and results of non-destructive testing.

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