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Vol.8 No.4previous AASP16(Vol.8 No.2) (118(Vol.8 No.2)- 119(Vol.8 No.2)- 120- 121) NT82

Academic Articles
Regular Paper Vol.8 No.4 (2017) p.57 - p.65

Development of Resilience Evaluation Method for Nuclear Power Plant
(Part 4: Concept of System Safety on Operating Nuclear Power Plant)

Hiroshi MIYANO1,*, Akira YAMAGUCHI2, Kazuyuki DEMACHI2, Takashi TANKATA3, Shigeki ARAI4, Naoki SUGIYAMA5
1Hosei University, 2-17-1 Fujimi, Chiyoda, Tokyo 102-8160, Japan
2The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 110-0033, Japan
3Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
4Atomic Energy Society of Japan, 2-3-7 Shinbashi, Minato, Tokyo 105-0004, Japan
5Mitsubishi Research Institute, Inc., 2-10-3 Nagata-cho, Chiyoda, Tokyo 100-8141, Japan

The total system design of a nuclear power plant ensures "Nuclear safety" through making practically achievable efforts to prevent and mitigate nuclear and radiological accidents. The performance based system design with "Defense in Depth (DID)" has been laid out as the key means to "preventing accidents", "controlling escalation to serious consequences", and "mitigating impact to the public". DID is extended to the management of severe accidents, and is an approach intended to provide protection against the development of a wide variety of events by means of redundant, diverse and independent protective barriers.

By combining the concepts and risk assessment discrete "Defense in Depth", it can be expressed as a risk level corresponding to the degree of each layer of the DID. A Situation that exceeds the normal operation becomes an abnormal situation in which more than even the design criteria, various AM measures are taken. The ability of the resilience to recover the function until the required function, and quantified in risk level as a safety corresponding capability of the system, are expressed as a resilience index.

By using the resilience index, safety capability of the plant system can be quantitatively grasped, that whether the safety by the AM measured is how much improvement, what is good to select which means, etc. it can be used for the decision.

Resilience Index, Safety Assessment, Severe Accident, Accident Management, System Safety
Full Paper: PDF EJAM Vol.8 No.4 pp.57-65 "Development of Resilience Evaluation Method for Nuclear Power Plant<br/> (Part 4: Concept of System Safety on Operating Nuclear Power Plant)"

Article Information
Article history:
Received 15 September 2016
Accepted 12 February 2017