In this study, a relationship between nuclear safety and inspection/monitoring was discussed. As a result of consideration, the followings were made clear. (1) Nuclear safety is secured by the combination of safety funct ns of nuclear plant system and plant managements by the human system including plant operator’s organization. (2) Nuclear plant systems should be managed for each safety system because safety functions are fulfilled for each safety system. (3) The integrity of concerned system in the futur...
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Study of the relationship between nuclear safety and inspection

In this study, a relationship between nuclear safety and inspection/monitoring was discussed. As a result of consideration, the followings were made clear. (1) Nuclear safety is secured by the combination of safety functions of nuclear plant system and plant managements by the human system including plant operator’s organization. (2) Nuclear plant systems should be managed for each safety system because safety functions are fulfilled for each safety system. (3) The integrity of concerned system in th...
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Study of the relationship between nuclear safety and inspection (The second report)

For creating a corrective measure plan for industrial plants like nuclear power plants, it is necessary to have a well-grounded basis. Therefore, this paper proposes a method for determining the fol lowing three elements of such a plan: the equipment to be repaired, the corrective measure method to be adopted, and the timing of its implementation using a scientific approach. The key idea is to analyze the components of the plan and also to take an approach of creating a plan based on the performance of the...
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Discussion of Corrective Action Planning for Nuclear Power Plants

For creating an inspection plan for industrial plants like nuclear power plants, it is necessary to have a well-grounded basis. Therefore, this paper proposes a method for determining the following three elements of such a plan: the equipment to be inspected, the inspection method to be adopted, and the timing of its implementation using a scientific approach. The key idea is to analyze the components of the plan by employing the understanding of cancer detection and diagnosis in medical science and a...
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Discussion of In-service Inspection Planning for Nuclear Power Plants

One of the most important things which should be explored in Maintenance Science is to make clear a structure and system of maintenance or maintenance activitie s. This study considered similarities between maintenance and emergency response in nuclear power plants from the viewpoint of Maintenance Science. As a result of consideration, this study showed the followings. (1) There are similarities b etween maintenance and emergency response in nuclear power plants -2Considering based on the similarities bet...
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Consideration on Similarities between Maintenance and Emergency Response in Nuclear Power Plants from the Viewpoint of Maintenance Science

This paper describes technical issues for the seismic safety of nuclear power plant components and also shows preliminary roadmaps for the solution of the issues. After the Chuetsu-oki earthquake of July 2007, research committees were established in JSME and AESJ for the disc ussion of the effect of the earthquake on NPP components. Ten technical issues due to the earthquake are pointed out and the discussion co ncerning the roadmaps has started to solve each issue. The goal of the activity is for the adva...
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Proposal of R&D Roadmaps for Technical Issues of the Seismic Safety of Nuclear Power Plant Components

Safety risk importance of components in nuclear power plants has been evaluated based on the probabilistic risk assessment and used for the decisions in various plant managements. But economic risk importance of the components has not been discussed very much. Therefore, this paper discusses risk importance of the components from the viewpoint of plant economic efficiency and proposes a simplified evaluation method of the economic risk importance (or economic maintenance importance). As a result of c...
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Study of a Simplified Method of Evaluating the Economic Maintenance Importance of Components in Nuclear Power Plant System

１．はじめに国内の原子力発電所は、機器ごとに適切な周期で様々な検査が行われている。この検査で、万が一、き裂が見つかった場合は、日本機械学会　発電用原子力設備規格　維持規格（以下、維持規格と略す）等に従い、健全性評価が行われている。また、必要に応じ、補修などの適切な処置が行われ、機器の健全性が確保されている。例えば、原子力発電所の主要機器の一つである原子炉圧力容器等の検査には、目視試験、表面試験、体積試験などがある。この目視試験は、主に水中カメラが利用されているが、その代わりとして超音波探傷試験または渦......

This study proposes a method to fabricate an artificial defect that is almost identical to stress corrosion cracking from the viewpoint of electromagnetic nondestructive evaluations. The key idea is to realize a region having electrical resistance embedded inside a conductive materials using solid state bonding. A rough region is introduced into the surface of the materials to be bonded so that the region is partially bonded to realize electrical resistance. Experimental demonstrations are carried out...
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Fabrication of imitative stress corrosion cracking specimens suitable for electromagnetic nondestructive evaluations using solid state bonding

This study proposes a method to fabricate artificial defects that is almost identical to stress corrosion cracking from the viewpoint of electromagnetic nondestructive evalua tions. The key idea is to realize a region having electrical resistance embedded inside a conductive materials using solid state bonding. A rough region is introduced into th e surface of the materials so that the region is partially bonded to realize electrical resistance The validity of the method is demonstrated using type 316L aus...
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Fabrication of imitative stress corrosion cracking specimens suitable for electromagnetic nondestructive evaluations using solid state bonding