Simplification of Thermal Model for Control Rod Design Mechanism and Its Application in Fatigue Analysis

Thermal situation of control rod design mechanism is complex,and it is difficult to directly analyze the effect of various heat transfer mechanism on the thermal distribution.Taking one CRDM as an example,and based on 3 kinds of heat transfer theory,transient analysis is conducted by taking the equivalent convective heat transfer as the external heat transfer of CRDM and the equivalent heat conductivity as the internal heat transfer,to simplify the heat transfer mechanism,and then fatigue analysis is conducted by the rain-flow method.This method finds an effective way to solve the fatigue problem of complex thermal situation.