核电厂热疲劳监测系统开发与应用

Development and Application of Thermal Fatigue Monitoring System in Nuclear Power Plant

核电厂实际运行瞬态的参数往往比设计条件更加复杂,设计中未能充分考虑的热分层和热冲击等,已引起了国际上压水堆核电厂一回路管道多起泄漏失效事件。针对设计中无法精确考虑的瞬态,主要通过增加额外的局部测点,实现部件疲劳寿命的精确评估(国内在此方面还处于起步阶段)。自主开发了一回路管道热疲劳监测系统(TECMAN系统),并在我国某核电厂稳压器波动管实现示范应用。结果表明,TECMAN系统成功监测到了启机阶段波动管内流体的热分层和热冲击现象,为热疲劳评估提供了有效输入。系统温度监测曲线与波动管原有传感器监测曲线具有很高的吻合度,表明TECMAN系统数据真实可靠。基于监测数据,对管道热疲劳损伤进行评价,对实现核电厂许可证延续运行(60 a)具有重要指导意义。

The actual transient parameters of nuclear power plants are often more complex than the design conditions.Several failures in the primary loop of PWR nuclear power plants in the world are caused by thermal stratification and thermal shock which are not fully considered in the design.For the transient that cannot be accurately considered in the design,the accurate evaluation of component fatigue life is mainly realized by adding additional local measuring points.But it is still at the initial stage in domestic that realize accurate evaluation of component fatigue life.In order to solve the problem of thermal fatigue,a thermal fatigue monitoring system,TECMAN,has been developed independently and applied in a nuclear power plant in China.The results show that the thermal stratification and thermal shock of fluid in surge tube during startup are successfully monitored by TECMAN system,which provides an effective input for thermal fatigue assessment.The temperature monitoring curve of the system is in good agreement with that of the original sensor monitoring curve,which shows that the data of TECMAN system is real and reliable.Based on the monitoring data,the thermal fatigue evaluation of the pipeline is of great significance to realize the 60 a operation of the nuclear power plant.