Leak Monitoring of a Fuel Channel Closure Plug Using Tritium Activity Analysis System

A Tritium activity analysis system has been used to detect the leakage from the closure plug on the fuel channels of 380. Comparing with DAC(derived air concentration) values of tritium concentration measured from various channels of rows and lines, it could be confirmed that this value measured from the activity analysis system which are composed and developed newly is nearly equivalent to tritium concentration value measured from fixed tritium area monitor(FTAM) which had been operated as the existing system. Therefore, it was suggested that the tritium concentration measuring technique using activity analysis system could be reliable method and a useful method for the detection of leakage of tritium or coolant from closure plug of fuel channel in heavy water reactor