원자력발전소의 물리적방호를 위한 핵심구역파악 규칙 개발 및 적용

• Published in: 한국안전학회지 Vol. 32; no. 3; pp. 160 - 171
• Main Authors: 정우식, Woo Sik Jung, 황미정, Mee-jeong Hwang, 강민호, Minho Kang
• Format: Journal Article
• Language: Korean
• Published: 한국안전학회 30.06.2017
• Subjects: nuclear power plant; physical protection; probabilistic safety assessment; vital area identification; 안전공학; physical protection; nuclear power plant; probabilistic safety assessment; vital area identification
• ISSN: 1738-3803; 2383-9953

US national research laboratories developed the first Vital Area Identification (VAI) method for the physical protection of nuclear power plants that is based on Event Tree Analysis (ETA) and Fault Tree Analysis (FTA) techniques in 1970s. Then, Korea Atomic Energy Research Institute proposed advanced VAI method that takes advantage of fire and flooding Probabilistic Safety Assessment (PSA) results. In this study, in order to minimize the burden and difficulty of VAI, (1) a set of streamlined VAI rules were developed, and (2) this set of rules was applied to PSA fault tree and event tree at the initial stage of VAI process. This new rule-based VAI method is explained, and its efficiency and correctness are demonstrated throughout this paper. This new rule-based VAI method drastically reduces problem size by (1) performing PSA event tree simplification by applying VAI rules to the PSA event tree, (2) calculating preliminary prevention sets with event tree headings, (3) converting the shortest preliminary prevention set into a sabotage fault tree, and (4) performing usual VAI procedure. Since this new rule-based VAI method drastically reduces VAI problem size, it provides very quick and economical VAI procedure. In spite of an extremely reduced sabotage fault tree, this method generates identical vital areas to those by traditional VAI method. It is strongly recommended that this new rule-based VAI method be applied to the physical protection of nuclear power plants and other complex safety-critical systems such as chemical and military systems.