CEFR事故余热排放系统管道热应变测量及结果分析

Measurement and Analysis of Thermal Strain in Emergency Decay Heat Removal System in CEFR

中国实验快堆(CEFR)以钠作为冷却剂。事故余热排放系统是CEFR快堆的专设安全设施,在反应堆出现地震、系统供电全部中断、全部蒸汽发生器给水中断的事故工况时,将堆芯余热通过空气冷却器非能动地排放到最终热阱。CEFR事故余热排出系统设计温度为550℃,运行温度最高为516℃,全部为双层管道,管道内运行介质为高温的液态金属钠。通过对事故余热排放系统进行热应变测量和数据分析,掌握系统管道的应力应变情况和监测系统运行状态的应力变化。

The coolant of China experimental fast reactor （CEFR） is sodium, and the emergency decay heat removal system is the safety features in CEFR, which can ensure the removal of the reactor core decay heat passively by air heat exchanger when earthquake, stop of system power supply, loss of steam generator feedwater occur. The emergency decay heat removal system design temperature is 550＂C, the maximum operating temperature is 516~C, all piping is double-wall structure, the medium is high temperature liquid metal sodium. Through thermal strain measurement and analysis of emergency decay heat removal system piping, we can grasp the stress and strain of this system, monitor the stress state when the system in operation.