【摘要】 针对CPR1000反应堆某一热电偶温度偏差超标的问题，搭建上腔室内支承筒组件的局部模型，研究其周围的流动换热状态及热电偶安装位置偏移导致的测量偏差。首先基于反应堆实测的热电偶温度数据拟合整个堆芯出口的温度曲面以补全上腔室的入口温度边界；然后根据不同堆芯功率改变模型边界条件，仿真计算流动换热状态及热电偶不同位置温度偏差。计算结果表明随着热电偶位置偏移量的增加，与入口通道温度的偏差量上升，最大温差为7.4℃,单一测点下的热电偶测温偏差量与堆芯功率成正比。文中仿真分析结果为之后对偏差热电偶的温度修正具有重要参考意义。更多还原

【Abstract】 Aiming at the problem of excessive temperature deviation of a thermocouple in the CPR1000,a local model of the upper plenum inner support cylinder assembly was established to study the flow and heat transfer characteristics around it, as well as the measurement deviation caused by the offset of the thermocouple installation position.Firstly, based on the thermocouple temperature data measured in the reactor, the temperature surface at the entire core outlet was fitted to supplement the inlet temperature boundary of the upper plenum.Then, the boundary conditions of the model were adjusted according to different core powers, and the flow and heat transfer states as well as the temperature deviations of the thermocouple at different positions were calculated through simulation.The calculation results show that: with the increase of the thermocouple position offset, the temperature deviation from the symmetric thermocouple increases, with a maximum temperature difference of 6.5 ℃;the temperature measurement deviation of the thermocouple at a single measuring point is proportional to the core power.The simulation and analysis results in this paper provide an important reference for the subsequent temperature correction of the deviated thermocouples.更多还原