Accurate water level measurement in nuclear reactors,particularly in PWRs(pressurized water reactors)and BWRs(boiling water reactors),is essential for ensuring the safety and efficiency of reactor operations.K-type HJ...Accurate water level measurement in nuclear reactors,particularly in PWRs(pressurized water reactors)and BWRs(boiling water reactors),is essential for ensuring the safety and efficiency of reactor operations.K-type HJTCs(heated junction thermocouples)are widely used for this purpose due to their ability to withstand extreme temperatures and radiation conditions.This article explores the role of HJTCs in reactor water level measurement and compares the performance of 2-wire and 3-wire connections.While the 2-wire connection is simple and cost-effective,it can introduce measurement inaccuracies due to wire resistance.In contrast,the 3-wire connection compensates for lead resistance,offering more precise and reliable measurements,particularly in long-distance applications.This paper discusses the operational considerations of these wiring configurations in the context of nuclear reactors and highlights the importance of choosing the appropriate connection type to optimize safety and measurement accuracy in PWR and BWR reactors.展开更多
本文根据压水堆(Pressurized Water Reactor,PWR)堆芯燃料组件间定向横流与湍流交混等流动换热特性,提出了一种基于Sub栅元尺度的压水堆堆芯子通道计算分析方法,通过细致划分Sub栅元控制体,建立高分辨率三维动量源模型,自主开发了基于...本文根据压水堆(Pressurized Water Reactor,PWR)堆芯燃料组件间定向横流与湍流交混等流动换热特性,提出了一种基于Sub栅元尺度的压水堆堆芯子通道计算分析方法,通过细致划分Sub栅元控制体,建立高分辨率三维动量源模型,自主开发了基于此方法的压水堆堆芯精细栅元子通道分析程序CUNLUN。选取OECD/NEA MATiS-H和EPRI NESTOR国际基准题进行数值模拟验证。在MATiS-H国际基准题中,4个不同位置的轴向速度平均相对误差为9.07%,该程序可以准确评估压水堆堆芯的热工水力特性。在NESTOR国际基准题中,32个对比点内有24个点的计算精度提升69.08%,表明高分辨率三维动量源模型可以有效提高CUNLUN代码的计算精度。本代码能为压水堆堆芯热工水力分析提供有效的设计和研究手段,对反应堆堆芯热工水力分析程序的开发提供借鉴与参考。展开更多
文摘Accurate water level measurement in nuclear reactors,particularly in PWRs(pressurized water reactors)and BWRs(boiling water reactors),is essential for ensuring the safety and efficiency of reactor operations.K-type HJTCs(heated junction thermocouples)are widely used for this purpose due to their ability to withstand extreme temperatures and radiation conditions.This article explores the role of HJTCs in reactor water level measurement and compares the performance of 2-wire and 3-wire connections.While the 2-wire connection is simple and cost-effective,it can introduce measurement inaccuracies due to wire resistance.In contrast,the 3-wire connection compensates for lead resistance,offering more precise and reliable measurements,particularly in long-distance applications.This paper discusses the operational considerations of these wiring configurations in the context of nuclear reactors and highlights the importance of choosing the appropriate connection type to optimize safety and measurement accuracy in PWR and BWR reactors.
文摘本文根据压水堆(Pressurized Water Reactor,PWR)堆芯燃料组件间定向横流与湍流交混等流动换热特性,提出了一种基于Sub栅元尺度的压水堆堆芯子通道计算分析方法,通过细致划分Sub栅元控制体,建立高分辨率三维动量源模型,自主开发了基于此方法的压水堆堆芯精细栅元子通道分析程序CUNLUN。选取OECD/NEA MATiS-H和EPRI NESTOR国际基准题进行数值模拟验证。在MATiS-H国际基准题中,4个不同位置的轴向速度平均相对误差为9.07%,该程序可以准确评估压水堆堆芯的热工水力特性。在NESTOR国际基准题中,32个对比点内有24个点的计算精度提升69.08%,表明高分辨率三维动量源模型可以有效提高CUNLUN代码的计算精度。本代码能为压水堆堆芯热工水力分析提供有效的设计和研究手段,对反应堆堆芯热工水力分析程序的开发提供借鉴与参考。
