Nuclear reaction with enormous energy, as a rich source of energy that has been brought to the human race, have developed as a nuclear power. However, the nuclear power generation is intended to provide a basic inherent “radioactivity risk“, the accident in Fukushima Dai-ichi Nuclear Power Plant was allowed to elicit it. Design, operation, and must be addressed to ensure safety measures in accordance with the role in the disaster areas. Prevention of abnormal event occurs, the enforcement of the mitiga...
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Nuclear safety to think with the society

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 the event of a general disaster or a nuclear disaster, the government will make announcements such as evacuation advisories and evacuation orders when there is a possibility that a crisis will occur to the general public. They take evacuation action to avoid damage based on the instructions. The issue here is that the significance of evacuation instructions applied to general disasters and nuclear disasters in terms of crisis management may be different for each disaster. Therefore, in this paper, the is...
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Crisis Management Issues by Comparing Natural Disasters and Nuclear Disasters

In Japan many people suffer from the event of natural disasters (typhoon,earthquake,tsunami,eruption,etc). There are two types in natural disasters, predictable disaster and unpredictable disaster. Typhoon is predictable disaster. On the other hand, earthquake is unpredictable disaster. In the predictable disaster cases like typhoon, the best choice is to go to the evacuation facility quickly. But many people don’t go to the evacuation facility, stay in their house. This is the reason why many people die in...
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Crisis Management Issues on Natural Disasters

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)

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 ...
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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. ...
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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)

In order to grasp efficiency of risk information, we tried to apply an insight of PRA to considering of severe accidents; TMI, Chernobyl, and Fukushima Dai-ichi. Based on this analysis, three points are disclosed. At first, PRA can product adequate countermeasures for low-likelihood events; huge earthquake or Tsunami. Next, PRA can prove weak points in design or operation reasonably. Third point is safety culture. PRA and safety culture are seemed to be connected deeply. These analyses revealed PRA is on...
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-For Discussions with the Public for the Safety of Nuclear Power -Applying Risk Information to Prevention/Mitigation of SA-

Target of PRA is not calculating PRA to get CDF/CFF, but providing significant and useful information from PRA results for risk-informed activities. Lot of risk applications have been implemented these about 20 years in US. After Fukushima Dai-ichi accidents, Japanese Nuclear Regulation Authority provided new regulatory requirements about external events and beyond design events. And Risk Application faces full-scale implementation. In this report, several methods of risk application are showed with adeq...
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- For Discussions with the Public for the Safety of Nuclear Power -Various Patterns of Risk Application Method and Examples-