Liquid leakage from the sea release pipe of the Tokai reprocessing plant; Summary of ocean-releasing facilities and the leak phenomenon (Confirmation based on the possibility)

Noguchi, Koji; Yasuo, Kiyoshi ; Seto, Nobuhiko; Iwasaki, Shogo; Inami, Shinichi

At the Tokai reprocessing plant, release of the low radioactive fluid to the ocean is carried out using sea release facilities. It was confirmed that there was a leak point on the sea release facilities. Therefore, check and investigation were performed and the leak point was identified. The leak part was cut and the part was then collected to investigate the cause of the leak. As a result, it was estimated that the leak occurred after the pipe was mechanically damaged and a successive change occurred on the part. For this leak point, a series of works for the cause investigation was carried out in detail, the repair work was performed, and preventive measures were taken against recurrences. This paper describes the summary of the sea release facilities, the situation of the outbreak of the leak, and the process that confirmed the leak point.