LIQUID METAL LEAKAGE DETECTION SYSTEM

摘要

PURPOSE:To obtain a highly reliable leakage detection system by arranging a pressure measuring device and a flow controller on the rear flow side of a liquid metal leakage detector to reduce the absolute number of detectors. CONSTITUTION:A gas sampled from partial spaces 4 between an Na piping 1 and a heat insulating material 2 through a sampling piping 5 is collected to a header 11 through a valve 6 and introduced to a liquid metal leakage detector 7 via a joining piping 12 and a valve 13 to check the existence of Na. Then, the gas is returned to near the piping 1 from a piping 10 passing through a pressure measuring device 16, a flow controller 8 and a circulation pump 9. Variations in the pressure measuring device 16 on the downstream side of the detector 7 allows the detection of clogging of a piping 5 due to mist, the heat insulation material and the like. When any variation in the measuring device 16 takes place, an affected piping can be identified by switching the valve 6 of the piping 5. The clogging can be removed by supplying a gas to the piping 5 from a supply tank 14. The correction of the detector 7 can be done by a gas from a correction supply tank 15 thereby improving the reliability of the leakage detection.