Nowadays, companies and educational institutions are required to prepare and respond to natural disasters with Business Continuity Plans (BCP). However, many of the BCP currently being formulated focused only on the natural disasters. Therefore, this study aims to develop the framework of BCP and its formulation method considering the compound risk of nuclear and natural disasters by utilizing the IRIDM process. The IRIDM process is to optimize decision-making for continuously improving the safety of Nuclea...
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Development of Business Continuity Plan Considering the Compound Risk of Nuclear Disaster Based on IRIDM process

We have developed a new index called Resilience index, which evaluate the reliability of system safety of nuclear power plant under severe accident by considering the capability to recover from the situation the system safety function was lost. In this paper, a detailed evaluation procedure for the Resilience index was described. System safety of a PWR plant under severe accident was then assessed according to the Resilience index concept to discuss applicability of the index. We found that the Resilie...
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Fundamental Study on Applicability of Resilience Index for System Safety Assessment

In Japan, PAZ -Precautionary Action Zone- and UPZ -Urgent Protective action planning Zone- are decided. On the other hand, there is a big typhoon in summer and heavy snow in winter in Japan. They might prevent citizen to protect from radioactive materials. Therefore, it is important to think evacuation in such a situation. This study uses OSCAAR -Off Site Consequence Analysis code for Atmospheric Release in Reactor Accident- that is developed by JAEA -Japan Atomic Energy Agency. OSCAAR can evaluate exposure...
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Evaluating exposure risk profile around NPP by Level3 PRA

In this research, a new index “The Resilience Index” was proposed to evaluate the capability of nuclear power plant to recover from the situation of safety function lost. Three elements assumed to evaluate the resilience index are the achievement rate, necessary time, and probability of success of each accident management activity. The resilience index is expected to visualize the improvement of safety of each nuclear power plant against severe accidents. ...
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Development of Resilience Evaluation Method for Nuclear Power Plant (Part 1: Proposal of Resilience Index for Assessment of Safety of Nuclear Power Plant under Severe Accident)

"Flux effects” on irradiation embrittlement in reactor pressure vessel materials is discussed in detail considering the interaction between two cascade damage occurred nearby. When no nano-scale structure exists nearby the cascade damages, flux effect can be categorized into three physical phenomena related to different irradiation-induced defects interaction. Interaction between a cascade damage and nano-scale structures, such as solute atom clusters, is important to model the growth phase of these structu...
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Mechanism-based discussion on flux effect to RPV embrittlement

We have developed a new index, called the resilience index, that evaluates the dynamic stability of the system safety of a nuclear power plant during a severe accident by considering the ability to recover system safety functions that have become lost in the situation. In this paper, a detailed evaluation procedure for the resilience index is described. The system safety of a PWR plant during a severe accident is then assessed according to the resilience index in order to discuss the applicability of ...
英字タイトル:
Development of Resilience Evaluation Method for Nuclear Power Plants (Part 3: Study on Evaluation Method and Applicability of Resilience Index)

We have developed a new index, called the resilience index, that evaluates the dynamic stability of the system safety of a nuclear power plant during a severe accident by considering the ability to recover system safety functions that have become lost in the situation. In this paper, a detailed evaluation procedure for the resilience index is described. The system safety of a PWR plant during a severe accident is then assessed according to the resilience index in order to discuss the applicability of ...
英字タイトル:
Development of Resilience Evaluation Method for Nuclear Power Plants (Part 3: Study on Evaluation Method and Applicability of Resilience Index)

In this research, a new index “The Resilience Index” was proposed to evaluate the capability of nuclear power plant to recover from the situation of safety function lost. Three elements assumed to evaluate the resilience index are the achievement rate, necessary time, and probability of success of each accident management activity. The resilience index is expected to visualize the improvement of safety of each nuclear power plant against severe accidents. ...
英字タイトル:
Development of Resilience Evaluation Method for Nuclear Power Plant (Part.1: Proposal of Resilience Index for Assessment of Safety of Nuclear Power Plant under Severe Accident)

PLiM会議は、関係者がPLMの良好事例を持ち寄って議論を重ねることにより、外形上の違いを超えたPLMの本質を把握し、その将来像を見定める機会となる。著者は、2022年11月28日～12月2日の期間にウィーンで開催されたPLiM-5会議でプログラム委員を務め、初期の準備段階から企画を担当したことから、本会議について報告する。...