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

This paper describes the development of a new inspection robot and support system used for the in-service inspection (ISI) of the reactor vessel of the FBR MONJU. The inspection is carried o ut using a CCD camera for visual tests and an EMAT for volumetric tests at elevated temperature (200 degree C) and high irradiation dose condition (10Sv/hr). The applicability of a commercia l CCD camera and an EMAT have been confirmed by experiments under severe conditions. In addition, reduction of the robot weight f...
英字タイトル:
Development of ISI system for FBR MONJU reactor vessel

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

This paper describes the development of a new sensor for the pipe health monitoring. The Hyb rid measuring using EMAT was made as a trial. It examined and checked that it could measure....
英字タイトル:
The pipe health monitoring method by Hybrid measurement using ultrasonic

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