Abstract: This paper discusses a development of the quantitative method to evaluate the reliability for the maintenance plan with respect to the risk impact both for Core Damage Frequency and Plant Trip Frequency. The quantitative approach includes the considerations for the effect of the Condition Based Maintenance (CBM) changing in addition to the Time Based Maintenance (TBM), and the reliability for the maintenance plan is evaluated using the actual plant-specific maintenance information collected ...
英字タイトル:
A Study on the Reliability Evaluation Method for Maintenance Planning Using Risk Information

This paper discusses an improvement of the quantitative method to evaluate the reliability for the maintenance plan with respect to the risk impact both for CDF (Core Damage Frequency) and Plant Trip Frequency. The quantitative approach includes the considerations for the effect of the Condition Based Maintenance (CBM) changing in addition to the Time Based Maintenance (TBM), and the reliability for the maintenance plan is evaluated using component failure rate which is presumed from experimental maintena...
英字タイトル:
A Study for the Reliability Evaluation Method for the Maintenance Plan Using the Risk Information II : - Part1 : The evaluation Method of failure rate based on degraded state analysis of component part ?

This paper discusses an improvement of the quantitative method to evaluate the reliability for the naintenance plan with respect to the risk impact both for CDF (Core Damage Frequency) and Plant T rip requency. The quantitative approach includes the considerations for the effect of the Condition Based Taintenance (CBM) changing in addition to the Time Based Maintenance (TBM), and the reliab ility for the naintenance plan is evaluated using component failure rate which is presumed from experimental naintena...
英字タイトル:
A Study for the Reliability Evaluation Method for the Maintenance Plan Using the Risk Information II? Part 2: An application example of the evaluation method of failure ratebased on degraded state analysis of component part ?

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...
英字タイトル:
Study of Application of Risk Information to Maintenance Management

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...
英字タイトル:
-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...
英字タイトル:
- For Discussions with the Public for the Safety of Nuclear Power -Various Patterns of Risk Application Method and Examples-

After Fukushima daiichi nuclear accident, it becomes more important risk communication with the public. In discussions with the public in nuclear safety, communication and discussions on risks that not only nuclear risks also social risks are important. Differences in viewpoints, understanding, and thought about risks become communication difficult. We need to discuss risks fairly, appropriately with the public and reduce total social risks. ...
英字タイトル:
For Discussions with the Public for the Safety of Nuclear Power -Discussion with the Public -

１． はじめに電気事業者は、原子力発電所において、中長期的な視点に立脚して評価対象期間の保安活動を評価し、必要に応じて安全性向上のために有効な追加措置を抽出することにより、今後、当該プラントが最新のプラントと同等の高い水準を維持しつつ安全運転を継続できる見通しを得ることをねらいとして、定期安全レビュー（Periodic Safety Review：以下“PSR”という。）を実施しており、現時点までに延べ74基（うち、24基は2回）で実施してきた。一方、電気事業者のPSRの経験を踏まえ、標準的な基準を提......