Survey and study on examination equipments for in-vessel components inspection in JOYO(II)

not registered; Sekiguchi, Mineo*; not registered; not registered; not registered

As a part of the development of the in-service inspection and repair(ISI & R) technology of FBR, study on examination equipments as visual method to verify in-vessel structures and assemblies was conducted. The objects of the study were higher resolution equipments using ultrasonic transducer technology to examine top area of assemblies in core support structure and parts of the core support structure where entrance nozzles of assemblies were inserted and withdrawn when refueling in 'JOYO'. As the result of the study, basic specification and structures of transducers and signal processing units, and conceptual design of basic structure of drive mechanics for the transducers were derived. The items and plan of the development of the equipments were made.