The current edition of “Guideline of Inspection and Evaluation for Reactor Internals issued by Japan Nuclear Safety Institute (JANSI) consists of inspection target, inspection method, and evaluation. Recently, the guideline is revised based on the safety function of the Reactor Internals, domestic operation experience, and the new knowledge. In this report, summary of “Guidelines of Inspection and Evaluation for Reactor Internals [Core Shroud] and [Shroud Support]....
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Guideline for BWR Inspection Program Revision Policy of Guidelines for Core Shroud and Shroud Support

The framework of intelligent support system for the maintenance of nuclear power plant is proposed in this paper with emphasis on the combined use of a portab le device and intelligent information processing. The purpose of this system is the realization of flexible inspection process and effective diagnosis process to be performed on-site with the aid of the mobile agent capable of performing various tasks moving along the network. The results of the scenario-based and f unction-based evaluation based on ...
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Application of Mobile Agent Technology for Maintenance Support of Nuclear Power Plants

Abstract This study proposes a method to optimize the maintenance activities of nuclear power plants. Risk Informed Mai ntenance method is based on probabilistic theory which deal the expectation of losses as quantitative Risk. This method compares the maintenance cost and risk, and determines the best maintenance plan on both reliability and financial asp ects. In this study, crack occurrence and growth is evaluated from laboratory data and inspection data using BAYSE-Law....
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Risk Informed Maintenance Method for Optimizing Maintenance Activities Method for Optimizing Maintenance Activities

Abstract: This study tries to clarify the maintenance activities that can be applied risk information to, and determine priority of the application. For that purpose, first, we investigated the maintenance activities themselves, and broke them down into 75 “Maintenance Elements”. Second, we evaluated whether each “ Maintenance Element” could be applied risk information to. Third, we determined the priority of the risk application on “application merit” and “possibility” aspects. This study has revealed t...
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Study of Application of Risk Information to Maintenance Management

Bare metal visual examination (BMV) is required for dissimilar metal welds of class 1 component for PWR (Pressurized Water Reactor) in inspection and evaluation guidelines published by Japan Nuclear Safety Institute (JANSI). However, there have been no guidelines which specify the procedures for BMV. In 2021, the guideline stipulating specific procedures for BMV were established by JANSI. This guideline includes both lessons-learned related to the boric acid corrosion on reactor pressure vessel upper head a...
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Establishment of Bare Metal Visual Examination Guideline for Class 1 Pressure Vessels such as Reactor Pressure Vessel

The framework of intelligent support system for the maintenance of nuclear power plant is proposed in this paper with emphasis on the combined use of a portable device and intelligent information processing. The purpose of this system is the realization of flexible inspection process and effective diagnosis process to be performed on-site. The prototype system has been implemented for the experimental facility with mobile-agent technology and PDA (personal digital assistant) to show the basic function...
英字タイトル:
Development of Maintenance Support System using Portable Device and Mobile Agent