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General design of on-line risk monitor for nuclear power plant   ZHANG Zhijian1,WANGHe1, and LI Songfa1   1.Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, College of Nuclear Science and Technology,  Harbin Engineering University, 145-1 Nantong Street, Nangang District, Heilongjiang, Harbin, 150001, P.R. China (wanghe@hrbeu.edu.cn)   Abstract: On-line risk monitor (OLRM) used in nuclear power plants (NPP) is based on the fault tree/event tree models typically used in the probabilistic safety assessment of NPP. OLRM is different from the existing risk monitor for NPP in that it receives on-line risk information from I&C system through hardware. At the same time, this risk monitor can automate operation and update the on-line risk model and the reliability data of the equipment by receiving signals. So the OLRM is in the stage 4 of living PSA according to the Freeman’s classification of the risk monitor. When the plant configuration changes, the risk monitor will get the results about instantaneous risk and component importance in time. This paper summarizes the features, structure and function of key parts of OLRM. Keyword: on-line risk monitor(OLRM); probabilistic safety assessment (PSA); living PSA(LPSA)
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