10MW高温气冷实验堆反应堆压力容器热电偶贯穿件

Thermocouple Penetration Assemblies for Pressure Vessel of 10MW High Temperature Gas- Cooled Reactor

介绍了 10 MW高温气冷实验堆反应堆压力容器热电偶贯穿件。热电偶贯穿件用于堆芯部件温度的测量，由贯穿筒体、铠装热电偶组件和焊接保护管组成。采用过渡管结构、激光焊和钨极氩弧焊方法，实现两种壁厚相差甚大的铠装热电偶套管和贯穿筒体的焊接，有效地解决了高温高压下氦气密封的困难。铠装热电偶组件直接贯穿反应堆容器，在容器外采用卡套密封，避免了高温容器内信号的转接。经 ANSYS程序分析计算，热电偶贯穿件的结构设计满足应力强度和抗震要求。经氦检漏试验，热电偶贯穿件泄漏率小于 1× 10－ 7 Pa· m3/s。该热电偶贯穿件现已在反应堆上安装完毕。

The paper presents the thermocouple penetration assemblies of 10 MW high temperature gas cooled reactor (HTR-10). The thermocouple penetration assemblies, which consist of penetration pipe, assemblies of sheath thermocouple and protective pipe for welding, are used to measure the temperature of components in the reactor. The laser welding technology is used to weld the transition pipe that is designed specially to the sheath thermocouple, and the argon arc weld (TIC) is used for welding the transitional pipe to the penetration pipe. So the difficult problem of sealing under high pressure and high temperature in helium gas environment is solved. By using the long sheath thermocouples, which pass through the container and are sealed by the swage lock, the traditional commutator for temperature measurement signal is avoided. By analysing and calculating with ANSYS program, the structure designs are proved to meet the case for the requirements of stress and earthquake-resistant. For the thermocouple penetration assemblies, the leakage of helium gas is less than 1×10-7 Pa&middot m3/s. Passing serial strict test, the thermocouple penetration assemblies have already been fixed in the reactor by now.