Improvement of maintenance management method of valvegasket in cell in Low radioactive liquid waste treatment process in Tokai Reprocessing Plant

Ishii, Takayuki; Kawata, Tsuyoshi; Choki, Toshiyuki

no journal, , 

Approximately 70 valves (three-part ball valves) are installed in cells related to the low-radioactive liquid waste treatment process at the Tokai Reprocessing Plant. In order to prevent liquid leakage from the joints of these valves, we investigated the relationship between the sealing material of the joints and the tightening force of bolts, practiced maintenance management of the valves using a bolt/nut tightening management method (torque management) that takes into account the characteristics of gaskets (PTFE), and report the results obtained.