Developmentofmeasurementofdisplacementofthetopofsub-assembly using super sonic sensor

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lt has been studied for safety plant test to demonstrate inherent safety of FBR core in JOYO. As a part of this study investigation of feedback reactivity was studied. And analysis code which can estimate the reactvity of core-bowing has been prepared. In post irradiation examination, remain bowing displacement of sub-assembly can only be measured, so development of measuring system of displacement of sub-assembly under operation is expected to improve estimation of core-bowing reactivity. lt is supposed that an on-line measurement system of displacement of the top of sub-assembly using super sonic sensor under operation is an effective means. ln this report, development of measurement of displacement of the top of sub-assembly using super sonic sensor was settled as follows. (1)Characteristic test of heat-resistant super sonic sensor (2)Design of adjustment device of super sonic sensor (3)Examination of in-water test for estimation of temperature fluctuation