“…How to quantify the degradation process is the key to carry out the time-dependent reliability analysis of the CRDM. [16][17][18] F I G U R E 3 Structure of CRDM latch assembly. 1-conducting ring, 2-lift coil assembly, 3-drive rod, 4-guide tube, 5-latch housing, 6-movable latch coil assembly, 7-movable latch, 8-movable latch plunger, 9-stationary coil assembly, 10-stationary latch plunger, 11-stationary latch support, 12-stationary latch, 13-stationary armature, 14-stationary latch pole, 15-buffer shaft, 16-coil housing, 17-lift armature, 18-lift spring, 19-lift shim, and 20-lift pole.…”