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中国实验快堆的主回路冷却系统和事故余热排出系统中部分管道的工作温度超过材料的蠕变温度(427℃),反应堆的设计寿期为30a,在运行中管道承受着反复的热载荷和机械载荷。为了确保反应堆的安全运行,必须对承受长期高温热循环载荷的钠管道进行疲劳和高温蠕变分析,进而完善快堆高温钠管道的安全分析和寿命评估,为CFR600运行寿命提供技术支持。从20世纪40年代起,已提出了近百个蠕变-疲劳寿命预测模型,
China Experimental Fast Reactor main loop cooling system and accidental waste heat removal system part of the pipeline operating temperature exceeds the creep temperature of the material (427 ℃), the design life of the reactor is 30a, in the pipeline to withstand repeated heat load and Mechanical load. In order to ensure the safe operation of the reactor, fatigue analysis and high temperature creep analysis of sodium pipes subjected to long-term high temperature thermal cycling load must be carried out to further improve the safety analysis and life assessment of fast reactor high temperature sodium pipelines and provide technical support for CFR600 service life. Since the 1940s, nearly one hundred creep-fatigue life prediction models have been proposed,