Reliability Analysis Method of Nuclear Cleaning System Considering Performance Degradation

As a degenerate system, nuclear cleaning system contains performance degradation components, which will lead to performance degradation of the whole system. In this paper, continuous degradation process of the component was discretized into several discrete states. The process of degradation and maintenance of the component was described by a Markov state transition diagram. A new extended multi-state voting gate, which can be combined with traditional multi-state logical gate to build a multi-state fault tree, was established to describe the relationship between the performance of the component and the subsystem. Monte Carlo method was used to simulate the multi-state fault tree to obtain the reliability parameters of the system. Finally, the application verifies the method presented in this paper, which provides a theoretical basis for reliability analysis of nuclear cleaning system considering performance degradation.