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中国百万千瓦级先进压水堆(CPR1000)核电站反应堆通过堆芯冷却监测系统(CCMS)测量堆芯出口冷却剂的过冷度。本文分析了堆芯出口冷却剂过冷度测量过程中的各种误差来源,对饱和状态下堆芯出口冷却剂温度测量的不确定度进行评定,得到不确定度区间边界随一回路压力变化的曲线,给出了用于判断堆芯冷却状态的堆芯出口冷却剂过冷度测量的误差ε曲线的确定方法,该方法已在CPR1000核电站中得到实际应用。
China’s Millions of kWh of Advanced Pressurized Water Reactor (CPR1000) reactors measure the degree of subcooling of the core outlet coolant through a core cooling monitoring system (CCMS). In this paper, various sources of error in the measurement of subcooling of the core outlet coolant are analyzed. The uncertainty of the outlet coolant temperature measurement in the saturated state is evaluated. The variation of the boundary of the uncertainty zone with the pressure in the primary circuit is obtained Curve, a method of determining the ε curve of the core outlet coolant undercooling measurement for determining the core cooling state is given. The method has been put into practical application in the CPR1000 nuclear power plant.