Investigation of application of acoustic sensor for the equipment of in-vessel structure's inspection to "JOYO"

not registered; not registered; not registered; not registered; not registered

As a part of the development of ISI (In-Service Inspection), the investigations regarding the inspection equipment which can observe the distortion of core assemblies under operating condition with ultrasonic measuring technique were performed as follows. (1)The test elements of high temperature ultrasonic sensor for the irradiation test in operating condition were manufactured. And it was confirmed that the elements had good performance under 500 C air condition. (2)The specifications of drive mechanism, cable and connector were clarified. And structure of the inspection equipment was investigated in consideration to conditions of actual plant in JOYO. (3)As the condition of irradiation test, the neutron flux which should be irradiated and the arrangement of the test elements in a test rig were estimated. It was confirmed that the irradiation test condition can be realized in the severance-rig within a fuel lack.