In-water test of ultrasonic sensors for the in-vessel structure inspection equipment under sodium in JOYO; Investigation for the concept of experimental equipment

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As a part of the development of ISI(In-Service Inspection), the investigations regarding the inspect ion equipment which can observe the distortion of core assemblies under operating condition with ultrasonic measuring technique were performed as follows. (1)The method in order to measure distortion of core assemblies under turbulent outlet sodium flow of the core assemblies was investigated. An improved arrangement of ultrasonic sensors on the equipment was also investigated in this study. (2)A conceptual design of a test rig and conditions of the in-water test, in which performance of the measuring system of core assemblies distortions will be evaluated, were investigated. (3)The conditions of irradiation test of the heat-proof ultrasonic sensors were revised according to the result regarding the ultrasonic sensor's arrangement. The neutron flux condition and the arrangement of the test elements in a test rig were also revised. So it was confirmed that the irradiation test conditions can be realized in the severance-rig within a fuel rack.