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Screening key parameters related to passive system performance based on Analytic Hierarchy Process Guohang MA a ,Yu YU a, Xiong HUANG a ,Yuan PENG a, Zuhua SHAN a, Nan MA a a School of Nuclear Science and Technology, Beijing Key Laboratory of Passive Safety Technology for Nuclear Energy North China Electric Power University Box,78, Beinong Road, Huilongguan, Changping District, Beijing, China, 102206 tel: 86(10)61773174, fax:86(10)61773156, e-mail: ******@ncepu. Abstract: Passive safety system is widely used in new generation nuclear power plant (NPP) design such as AP1000 to improve the reactor safety benefitting from its simple construction and less request for human intervene .H owever, the functional failure induced by uncertainty in system thermal-hydraulic (T-H) performance es one of the main contributors to system operation failure since the system operates based on natural circulation, which should be considered in the system reliability evaluation .In order to improve the calculation efficiency key parameters which affect the system T-H characteristic importantly can be screened and then be analyzed in detailed. T he Analytical Hierarchy Process (AHP) is one of the efficient methods to analyze the influence of the parameters on system operation based on the experts ’ experience . Nevertheless too many parameters need to be analyzed and the T-H model itself is plicated than statistical model , so the traditional AHP method can be mended to use for screening key parameters. In this paper, we adapt the method in hierarchy construction and experts ’ opinions integration to use in the key parameters screening efficiently. T he passive containment cooling system in AP1000 is evaluated as an example, and 5 key parameters are selected from 52 inputs. Keywords: Analytic Hierarchy Process , passive system reliability, natural circulation, thermal-hydraulic performance, probabilistic density distribution 1. Introduction Advanced nuclear reactor designs in corpor