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「常陽」炉内検査装置用超音波センサの炉外水中試験 -試験装置の概念検討-

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

小舞 正文*; 佐藤 孝男*; 唐沢 博一*; 若松 光夫*; 小川 不二雄*

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

高速炉の供用期間中検査に関する技術開発の一環として、原子炉運転中の炉心の挙動を超音波技術によって観測する炉内検査装置について、以下の検討を行った。・集合体上部の温度ゆらぎの影響を考慮し、炉内検査装置の超音波センサによる集合体頂部の変位計測方法を検討し、超音波センサ配置の最適化検討を行った。・集合体上部の温度ゆらぎの影響及び集合体の頂部の変位計測性能を評価するための炉外水中試験装置の基本構成及び試験条件の検討を行った。・炉内検査装置の超音波センサの配置検討結果に基づき、超音波センサの炉内照射試験の照射条件の見直しを行い、必要な照射量や照射位置の検討を行った。

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.

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