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

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

The purpose of this study is to develop a hybrid sensor to be able to measure two or more physical values (the pipe surface temperature, the pipe wall thinning and the temperature of an internal fluid) with one sensor with an electromagnetic acoustic transducer. Each result of a measurement can improve the measurement precision by doing working that calibrate each other. The piping surface temperature was measured by converting the direct current resistance at the temperature by using the EMAT coil. A...
英字タイトル:
Study on pipe health monitoring method by hybrid measurement using electromagnetic ultrasonic

For decommissioning of the Fukushima Daiichi Nuclear Power Station of Tokyo Electric Power Company Holdings, Incorporated, we are now developing remote laser diagnostic techniques for integrity evaluation of support structures. Ultrasonic waves were induced on a sample by an impact laser. The waves propagating through the sample were detected with a laser Doppler vibrometer using a measuring laser. This technology enables remote, non-contact diagnosis....
英字タイトル:
Characteristics of structures using laser diagnostic techniques

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

For decommissioning of the Fukushima Daiichi Nuclear Power Station, installation of an optical fiber seismic vibrometer using a specially designed robotic system was demonstrated. A water tank with 4.5m diameter and 5m depth was used as a demo-plant of tank type critical assembly. Micro-earthquake response of a water tank was detected by the optical fiber seismic vibrometer. Vibration characteristic of the window of the water tank was monitored by laser Doppler interferometer....
英字タイトル:
Development of micro-earthquake response detection by optical fiber seismic vibrometer with a water tank and a specially designed robotic system

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...
英字タイトル:
Decontamination estimate and demonstration test results on road in the return difficult area.

This study checks the high-temperature durability of the electromagnetic acoustic transducer (EMAT) for pipe wall inning. We inserted EMAT into the oven and measured the 10mm thickness specimen by EMAT about two years. Measurement was carried out by two kinds, a pulse echo method and a pulse echo resonance method. And igh-temperature durability was checked by both of the measuring methods. Compared with the pulse echo method, the ulse echo resonance method of measurement accuracy was better. The filter pro...
英字タイトル:
The durability test result in high temperature of EMAT for pipe wall thinning monitoring

A maintenance management suitable to nuclear power plants (NPP) at R&D stage was discussed. Objectives of maintenance management of NPP at R&D stage was first clarified. Next, applicability of codes for maintenance management of commercial NPP to NPP at R&D stage was discussed. Then, requirements and consideration for maintenance management of NPP at R&D stage was proposed. Finally, an example that the proposal was applied to setting maintenance program of sodium-cooled fast reactor was presented. ...
英字タイトル:
Proposal of Maintenance Management of Nuclear Power Plants at R&D Stage by Taking Account of Their Features