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; 海中放出管の漏えい原因究明,1; 損傷から漏えいへの進展

Liquid leakage from the sea release pipe of the Tokai reprocessing plant; Cause investigation of the leak, 1; Progress from mechanical damage to the leak

脇本 文次; 森本 憲次; 照沼 朋広 ; 大関 達也 ; 岩崎 省悟; 伊波 慎一

Wakimoto, Fumitsugu; Morimoto, Kenji; Terunuma, Tomohiro; Ozeki, Tatsuya; Iwasaki, Shogo; Inami, Shinichi

東海再処理施設の海中放出設備からの漏えい事象の原因を究明するため、漏えい箇所の配管を回収し、観察,分析等の調査を行った。その結果、放出管の漏えい箇所は施工時に外部から損傷を受け、損傷を受けた箇所に経年的な変化により、き裂,割れが生じ、漏えいに至ったものと推定した。本件では、漏えい原因のうち、損傷は施工時に外部から大きな力を受けたことで生じたものであると推定した経緯等について報告する。

To investigate the cause of the leak phenomenon from the sea release facilities of the Tokai reprocessing plant, the part of the pipe having the leak point was collected, and the investigations such as surface observation, chemical analysis etc. were performed. As a result, following things were shown as estimated causes; the leak point of the release pipe was mechanically damaged during the construction, breaking occurred on the damaged part by a successive change; and the leak occurred. This paper reports the details of the identified cause that the initial damage by external force would affect the leak phenomenon of the sea release piping.