It is important for maintenance of nuclear power station facilities in the future to promote mathematical techniques which support judgement to modify maintenance practices, such as maintenance tasks, maintenance implementation timing, and so on. Mathematical Maintenance Working Group, which has been established by Maintenance Standardization Committee since July 6, 2018, is investigating application examples of such mathematical techniques in maintenance planning as influence evaluation of changing maint...
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Investigation on application examples of mathematical techniques to support judgement to modify maintenance practices

Underwater inspection vehicles for nuclear power plants were selected as the third maintenance heritage. Hitachi- GE Nuclear Energy, Ltd and Toshiba Energy Systems & Solutions Corporation have been working on miniaturization and weight reduction of vehicles for many years, and enabling visual inspection of narrow space and bottom of the nuclear reactors, which were not accessible with the conventional hanging cameras. This article describes the developed vehicles by each company and their contribution to ma...
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The Third Maintenance Heritage Underwater Inspection Vehicles for Nuclear Power Plants

The support system which utilized the wearable devices which consist of a smart glass, a camera, a portable computer, a headset, etc., and aimed at the efficiency improvement of field operation was developed. The evaluation results in the actual plant about real time transmission of image and sound between work field and remote office, and the self-localization using VSLAM (Visual Simultaneous Localization and Mapping) technology are reported....
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Wearable Computing for Support Systems at Work Site of Nuclear Plant(2)

Toshiba Energy Systems & Solutions Corporation develops improved ABWR which can be implemented in early 2030s. Our development course is that the improved ABWR has both of world highest level safety feature and economic competitiveness against other power generation systems. In safety feature, the improved ABWR introduces passive safety systems for elimination of common caused failure and enhancement of safety reliability, air-cooled ultimate heat sink for reduction of tsunami risk and reinforcement of the ...
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Development of Improved ABWR with Safety Enhancement and Economic Competitiveness

During operation or regular inspections at power plants, regular patrol inspections are carried out in order to identify abnormalities at the site at an early stage. In the patrol inspection, in addition to recording the confirmation items, the site situation is recorded with images such as photographs and videos. It is a process that consumes the administrator's time because it is necessary to manage photos and videos by collating them with the layout of the building. For the purpose of streamlining these ...
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Development of information management technology for advanced patrol inspection

Due to the increase in aging social infrastructures and the shortage of human resources with the declining birthrate and aging society, labor saving in patrol and inspection work is required. The purpose of this work is not only to reduce the load of patrol and inspection but also to provide new services such as digitization of inspection data. We have developed autonomous four-wheel robot and drone as mobile platforms that can patrol on behalf of workers. The robot can take pictures of the target equipment...
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Autonomous mobile platform for advanced patrol inspection

The SCC Protect Technology by Peening is registered in The Maintenance Heritage by JSM We introduce The SCC Protect Technology by Peening in NPS...
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The SCC Protect Technology by Peening in NPS

In the application for approval of nuclear power plant operation period extension, it is required to carry out two surveillance tests separately from the conventional plan. At this time, it is necessary to compensate for the surveillance test piece by reconstitution bonding of the used test specimen, since the shortage of the test specimen is expected. Although the used test piece of the welded part is used for the reconstitution bonding of the heat affected zone (HAZ) test piece, the test piece collection ...
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Applicability of Reconstituted Surveillance Test Piece for RPV Embrittlement Evaluation

Removal of large rubble from the roof and walls of the reactor building collapsed due to the hydrogen explosion and dose rate reduction for human workers to begin preparation work shall be accomplished for retrieval of spent fuel from the spent fuel pool at Fukushima Daiichi Nuclear Power Station Unit3. This paper describes the method of survey and evaluation, decontamination and shielding method for dose rate reduction on operational floor of Fukushima Daiichi Nuclear Power Station Unit3....
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Approach to Dose Rate Reduction for Retrieval of Spent Fuel from Spent Fuel Pool at Fukushima Daiichi Nuclear Power Station Unit3

Since the 2011 Great East Japan Earthquake, Toshiba Energy Systems & Solutions Corp. (Toshiba) has accomplished various tasks in preparation for the upcoming fuel removal operations at the Fukushima Daiichi Nuclear Power Plant (F-1) Unit 3. In November 2015, TEPCO and Toshiba removed large rubble (e.g. Fuel handling machine) that had been sitting inside the spent fuel pool [SFP] as a result of the hydrogen explosion. Currently, Toshiba continues to work on the projects related to fuel removal from the SFP, ...
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Effort aimed at removal of stored fuels from SFP in Fukushima Daiichi Nuclear Power Station