核电厂管道热疲劳机理与防治

Pipe Thermal Fatigue and Prevention Method in Nuclear Power Plant

管道热疲劳是管道受交变热应力长期影响而产生管道裂纹或破裂的现象,虽然热疲劳原因引起的管道破裂事件在核电厂发生的概率很小,但管道破裂有可能引起一回路破口等事故,因此需要引起重视。本文对管道热疲劳产生的机理进行分类并进行分析,根据管道热疲劳产生机理的特征,提出核电厂设计、在役运行阶段应采取管道热疲劳预防与检测的措施。

Pipe thermal fatigue crack phenomena are that caused by thermal stress effect with long time.Pipe thermal fatigue crack accident is lower probability in nuclear power plant,but it should be paid enough attention because the crack accident may lead to lose of coolant accident(LOCA).The paper analyses and classifies the thermal fatigue mechanism.According to different pipe thermal fatigue characters,it makes thermal fatigue prevention suggestions that should be adopted in nuclear power plant designing and operating.