Fatigue life analysis of key equipment for high temperature reactor under variable working conditions

For the high temperature reactor with helium gas in the nuclear power plant, this paper has analysed the stress changes and temperature changes of the key equipment in the reactor under the changing conditions of the actual operation of the critical equipment [1-3]. Based on the threshold value that can satisfy the normal work, according to the expansion mechanism of fatigue crack in fracture mechanics, combined with the actual material parameters of the inner rod, this paper has prejudged the critical location or key products in the equipment, and the location and timing of their work tolerance limits. This paper has also calculated their residual fatigue life. It has certain guiding significance for the calculation of residual fatigue life of proprietary equipment in high temperature gas cooled reactor.