Reliability and Quantitative Probabilistic Safety Analysis of a Locking Mechanism Based on Virtual Prototyping Technology

The reliable locking mechanism is crucial for the operation of nuclear power control systems. This study takes the locking mechanism of a certain nuclear power control system as the analysis object, and conducts its reliability and quantitative probability safety analysis to ensure the reliable locking of the locking mechanism. Firstly, FTA fault tree analysis was conducted on the loosening of the locking mechanism to determine the cause of the failure; At the same time, an ADAMS virtual prototype and finite element model of the locking mechanism were established, and dynamics and finite element analysis of the locking mechanism were carried out to analyze the mechanism of deformation and failure events of the locking hook; Secondly, the Monte Carlo reliability algorithm and ANSYS call interface program were developed, enabling the Monte Carlo algorithm to automatically call ANSYS for collaborative simulation through the interface program, and quantitatively analyze the reliability of locking hook deformation of the locking mechanism; Finally, an interference equation was established for the deformation failure mode of the locking mechanism hook, and collaborative simulation calculations were conducted for the deformation failure events of the locking mechanism under different confidence levels. After conducting reliability design analysis of the locking mechanism according to the technical route in this article, the product successfully passed various tests such as earthquake and vibration. The product had been applied to multiple nuclear power systems such as the Daya Bay Non Safety Control System and the KDO/KME in Qinshan/Ling'ao. This reliability design analysis method has important reference value for reliability analysis and quantitative probabilistic safety analysis of similar mechanisms.