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Sitong Ling,Wenqiang Li,Tianda Yu,Qiang Deng,Guozhong Fu 한국원자력학회 2021 Nuclear Engineering and Technology Vol.53 No.12
The Control Rod Drive Mechanism (CRDM) is an essential part of the reactor, which realizes the start-stopand power adjustment of the reactor by lifting and lowering the control rod assembly. As a moving partin CRDM, the latch directly contacts with the control rod assembly, and the life of latch is closely relatedto the service life of the reactor. In this paper, the relationship between the life of the latch and the stepstress, friction stress, and impact stress in the process of movement is analyzed, and the optimizationmethodology and process of latch life based on the approximate model are proposed. The design variables that affect the life of the latch are studied through the experimental design, and the optimizationobjective of design variables based on the latch life is established. Based on this, an approximate model ofthe life of the latch is built, and the multi-objective optimization of the life of the latch is optimizedthrough the NSGA-II algorithm.