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...
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Development of ISI system for FBR MONJU reactor vessel

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....
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The pipe health monitoring method by Hybrid measurement using ultrasonic

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....
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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....
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Development of Inspection and Repairing Technology for FBR Heat Exchanger tubes (II)Preparation of Operation Software and Performance Check

Since the FBR plants in commercial stage is designed 60 years reactor life which is twice of the prototype FBR “Monju“, ma intenance technologies considering aging and damage for a long term using at high temperature are needed. Development of t he in-service inspection and the repair technologies needed for maintenance of the commercial used FBR is discussed after reviewing the features of the FBR plants, and experience of ISI and repair of the experimental FBR “Joyo“ and the “Monju“....
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Development of the In-service Inspection and Repair Technologies toward theCommercialization of Fast Breeder Reactor

Prototype fast breeder reactor “Monju“ attained the first critical on April 5th in 1994. The sodium leak accident in a secondary main co oling system was occurred during power rise examination on December 8th in 1995, and the “Monju“ has stopped after that. Various efforts such as reconstruction of the secondary cooling system and following verifications on integrity of components and facilities are contin ued towards the early restart up of the “Monju“ at present. The current status and efforts on mainten...
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Current Status of Monju and Effort on Maintenance 柳澤 務 Tsutomu YANAGISAWA

This paper compared evaluation results of decontamination simulation with the actual decontamination result. One of the major factors that decontamination does not proceed, is that the decontamination results are unpredictable. JAEA has developed the software that can be predictive simulation of decontamination with a simple user interface. The purpose of this study is that to evaluate the simulation accuracy. JAEA evaluated accuracies that compared simulation results of decontamination simulation with...
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Decontamination estimate and demonstration test results on road in the return difficult area.

This study was performed to enrich the contents of measures for an ageing of t he nuclear power plants at Fukui area, where infrastructures of research works , for example, institutes, universities etc. are intensively existed., accordi ng to the Road-Map established by the Atomic Energy Society of Japan at 2005,...
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Research Program for Ageing of Nuclear Power Plant based on Characteristics of FUKUI Area

A composite-type optical fiberscope was combined with a laser processing head to repair heat exchange pipes of Fast Breeder Reactor (FBR). The head can rotate axially and move back and forth longitudinally in the 1-inch pipes. The property of fiberscope and the motion of the head can successfully observe the pipe’s inner surface to find the cracks which should be repaired by laser welding. The project, which aims for developing the integrated system of inspection and repair, proposes an effective cost...
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Development of a Laser Processing Head Using a Composite-type Optical Fiberscope to Inspect and Repair 1-inch Heat Exchanger Pipes

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....
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Development of Multi-coil RF-ECT Sensor for JSFR SG tubes