Analysis and recurrence prevention measures on liquid waste transfer piping leakage incidents at the JMTR Facility

Araki, Daisuke; Ouchi, Takuya; Shinoda, Yuya; Yoshida, Hayato; Kawamata, Takanori; Watahiki, Shunsuke

Nihon Hozen Gakkai Dai-21-Kai Gakujutsu Koenkai Yoshishu, 5 Pages, 2025/07

This study was investigated a leakage incident of the liquid waste transfer piping installed to transport radioactive liquid waste from the JMTR (Japan Materials Testing Reactor) building to a storage tank. As a result, it was evaluated that the leakages were caused by the atmospheric stress corrosion cracking (ASCC) or the crevice corrosion under the installed environmental and operational conditions. Based on these findings, countermeasures were implemented following pipe replacement, and the knowledge is being applied to future decommissioning efforts.