東海再処理施設における海中放出管からの漏えいについて 1 - 海中放出管漏えい箇所の復旧-
Liquid leakage from the sea release pipe of the Tokai reprocessing plant- Restoration of the leak point at the see release pipe --
著者:
青木 賢二 Kenji AOKI 清水 和幸 Kazuyuki SHIMIZU 山本 昌彦 Masahiko YAMAMOTO 檜山 久夫 Hisao HIYAMA 岩﨑 省悟 Shogo IWASAKI
発刊日:
公開日:
coupling techniquemechanical couplings sea release pipesealability
概要
A leakage was found on the sea release pipe of the Tokai reprocessing plant The leak point was discovered in a part buried in the sea floor The damaged part was cut and was collected, and investigation into the cause was subsequently carried out As a result, external force and hydrogen embrittlement were estimated to be the cause that produced a crack on the pipe As restoration of the leak part, a construction method using a coupling technique was proposed considering steady sealability on the restored part as wel l as constraints on the construction in the sea The electrolytic protection system was improved to prevent hydrogen generation This paper describes the connection method using a coupling technique for the existing pipe and replaced one, and the new protection method In addition, it was found that there were no problems on the sea release piping after checking the influence caused by the Tohoku district off the Pacific Ocean Earthquake
