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Effects of dependent critical parameters on reliability of natural circulation-basedpassive system   OLATUBOSUN Samuel Abiodun1,2, and ZHANG Zhijian2   1. Nigeria Atomic Energy Commission, Nigeria (samuelolatubosun@hrbeu.edu.cn) 2. College of Nuclear Science and Technology, Harbin Engineering University, Harbin, 150001, China (zhangzhijian@hrbeu.edu.cn)   Abstract: The adoption of passive safety systems in nuclear technological applications especially in advanced nuclear power reactors is on the increase purposely to improve on safety, simplicity and economics of operations. In order to guarantee the effectiveness of passive systems, the thermal-hydraulic and reliability analysis must be carefully carried out especially for the thermal-hydraulic passive systems which are characterized by several aleatory and epistemic uncertainties. It has been established that the critical parameters influencing the performance or failure behavior and consequently reliability of the thermal-hydraulic passive systems are interdependent in nature. As a result, it is important to critically consider the synergetic effects of the influencing parameters of reliability of such passive systems. Reliability methodologies are now being modified and improved upon by factoring the dependency nature of those influencing parameters into reliability analysis to obtain more realistic and accurate results. This paper thus focused on the effects of the dependent critical parameters onthermal-hydraulic (phenomenological) reliability using multivariate distribution analysis. A passively water cooled steam generator was used to demonstrate the interdependency effects of the key critical parameters. The results obtained justified the significance of considering the dependency effects of these parameters in thermal-hydraulic reliability analysis of the passive safety systems. Keywords: critical parameters; reliability; natural circulation; passive safety system
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