Leak detection method

Purpose: To perform satisfactory automatic scram for reactors by reliable leak detection in LMFBR type reactors. Method: A plurality of leak detectors each given with a channel number are provided to equipments and pipeways in a nuclear power plant. A digital computer receives the outputs from the leak detectors and judges, if the predetermined number of detectors are actuated, whether the plurality of actuated detectors are at the positions adjacent to each other. If they are at the adjacent positions, the digital computer judges that liquid leaks occur. That is, the digital computer judges the degree of significance for the locations of the leak detectors from their channel numbers, and issues a plant stop signal where the leak is judged and if the degree of significance is high. (Horiuchi, T.)