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Methodological basis of plant DiD risk monitor system development and its prospective applications for NPPs NAKAGAWA Takashi1, TERASHITA Naotaka2, and YOSHIKAWA Hidekazu3 1.Prime System Laboratory Co., Ltd.,　Suimeidai 4-4-13, Kawanishi-Shi, 666-0116 Japan (Nakagawa@prime-system.jp) 2.System P&A, Ryuge-Cho 1-4-2-2207, Yao-Shi, 581-0069 Japan (terashita.naotaka@system-panda.jp) 3.Symbio Community Forum, Co. RIAS, Tanaka-Ohi-Cho 49, Sakyo-Ku, Kyoto, 606-8202 Japan (yosikawa@kib.biglobe.ne.jp) Abstract: A new risk monitor system is under development which can be applied not only to prevent severe accident in daily operation but also to serve as to mitigate the radiological hazard just after severe accident happens. The system simulates these applied situations, by generating interactions among all actors such as the plant and related people coping with the accident. In this paper, the plant DiD risk monitor has been developed utilizing Unified Modeling Language (UML) to model actors' knowledge and express the interactions. Case study to confirm functionality and ability of DiD risk monitor is also introduced by showing examples for Station blackout accident in conventional PWR plant in Japan. Prospective application areas are also discussed of the developed plant DiD risk monitor for the safety improvement of nuclear power plants. Keyword: defense-in depth; risk monitor system; object oriented program; unified modeling language; state chart diagram; sequence diagram
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