再処理施設分析廃液配管の腐食部の復旧

Restoration of the corrosion department of the reprocessing facilities analysis waste fluid plumbing

西田 直樹 ; 諏訪 登志雄 ; 田中 直樹 ; 稲田 聡; 久野 剛彦 

Nishida, Naoki; Suwa, Toshio; Tanaka, Naoki; Inada, Satoshi; Kuno, Takehiko

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漏えいの原因の調査のため切取った配管部について、新規に準備したSUS配管を溶接し復旧した。復旧工事においては、配管の周囲をグリーンハウスで覆い、放射線防護措置を施した状態で、配管切断部の除染、開先加工、バックシールガスを流しながらの溶接を実施した。これらの一連の工事について、放射性物質を内包する配管を溶接する際の作業について報告する。

Corroded pore was found at stainless pipe for liquid waste solution from the analytical laboratory. Part of the pipe was cut for preparing samples to investigate the cause of the corrosion. The same size of stainless pipe was welded to recover it, under the strict radiation control. The restoration work was done inside of the vinyl house, as it is called "greenhouse", which was the small room completely separated by vinyl sheet. All the works, cutting, decontamination, digging groove and welding with back seal gas, were done inside of the greenhouse. We report the work method for recovery of corroded pipe containing radioactive materials