This paper describes detection of electro-discharged machine (EDM) defects in magnetic steam generator (SG ) tubes of Monju fast breeder reac tor (FBR). The EDM defects are located under support plate (SP), on the outer tube surface and they are detected by a remote field eddy curre nt probe. Using the experimental measurements and a multi frequency algorithm, the defect signal can be extracted from the SP signal. The pa rameters of the multi-frequency algorithm were calculated by comparing SP measurements...
英字タイトル:
Detection of EDM Defects Under Monju Support Plate Using Experimental Data from Remote Field Eddy Current Probes and a Multi-frequency Algorithm

Japan Atomic Energy Agency, FBR Research Center Shinya MIYAHARA, Japan Atomic Energy Agency, FBR Research Center The present p aper estimates using numerical simulations the eddy current effect of the sodium layer located outside of steam generator tube s of fast breeder reactors. Variations in the outside tube defect signal are computed by finite element simulations. The numer ical model of sodium layer is based on the experimental determination of the sodium layer using a test tank sodium experiment....
英字タイトル:
Simulations and Measurements of Sodium Effecton the ECT Signal for SG Tubes of FBR

The Sodium Engineering Research Facility was constructed next to the MONJU site to conduct R&Ds such as sodium handling technology, maintenance technology, safety related research and so on. This facility also supports safety and stable operation of the MONJU and is expected to be a foothold of regional and international collaboration between academia and industry. In this paper, overview of this facility and specifications of test equipment will be explained. Also the research program related to main...
英字タイトル:
R&D Program of Maintenance Technologies for the Fast Reactors in the Sodium Engineering Research Facility

A hybrid optical fiber scope and a laser processing head were combined with an eddy current testing un it for the inspection and repairing for Fast Breeder Reactor's heat exchanger pipes. The project propo ses an effective cost reduction method for maintenance of FBR by extension of the heat exchanger's lif etime. By the end of March 2010, a prototype probing system for heat exchanger pipes will be completed....
英字タイトル:
Development of Inspection and Repairing Technology for FBR Heat Exchanger Pipes

In order to maintain FBR heat exchanger tubes, a new probe system was designed. A coupling u nit and operational software are key components in the second year. The coupling unit to com bine a high energy laser beam and optical fiberscope images was developed. The operational s oftware successfully controlled an eddy current testing device and a laser processing head....
英字タイトル:
Development of Inspection and Repairing Technology for FBR Heat Exchanger tubes (II)Preparation of Operation Software and Performance Check

A new design was adopted for SG of JSFR (Japan Sodium-cooled Fast Reactor) using double-wall tubes. The present paper estimates and assess the defects detection in double-wall SG tubes for JSFR using Multiple RF-ECT sensor. We confirmed that proposed Multiple RF-ECT sensor has a high sensitivity to detect small defects....
英字タイトル:
Development of Multi-coil RF-ECT Sensor for JSFR SG tubes