Leak Detection and Location in Monju Steam Generators

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Saito, T.*; Kosugi*

Saito, T.*; Kosugi*

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Leak detection system of MONJU steam generator depends mostly on in-sodium hydrogen detectors. The requirements onleak detector performance is determined from the point of view of protecting tube leak propagation due to wastage, and the process of determining the performance is shown briefly. Research and development activities on in-sodium hydro-gen detectors are described and the specifications of leak detectors for MONJU are also presented. In-cover-gas hydrogen detector and acoustic detector are under development.research and development activities on the leak location after steam generator shutdown by such methods as an electro-magnetic method and ultrasonic method are described. The results of the research and development work on inserting the test probes into tubes are described also. An idea for finding the condition of tubes in the neighbourhood of the leak is also presented.