Effectiveness Analysis for Core Coolant Monitoring System during Medium Loss of Coolant Accident
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摘要: 为了验证中国改进型百万千瓦级(CPR1000)核电站在一回路中等破口失水事故(MLOCA)工况下堆芯冷却监视系统(CCMS)测量的有效性,及定量分析控制系统中反应堆冷却剂泵(简称:主泵)状态的2种判定方法导致的水位计算差异,对CCMS测量原理进行了分析。以RELAP5-3D程序对CPR1000机组进行热工水力建模、使用虚拟数字化控制系统(DCS)模拟其控制逻辑,定量计算了在这2种主泵状态判定方法中CCMS输出水位及其误差,并分析了误差产生的原因。结果表明:2种方案都会引入较大的水位误差,结合状态导向法事故处理程序(SOP)分析,可能使操纵员对堆芯水位判断产生一定的误导。
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关键词:
- 堆芯水位 /
- 堆芯冷却监视系统(CCMS) /
- 中等破口失水事故(MLOCA) /
- 主泵状态 /
- 全范围模拟机(FSS)
Abstract: In order to validate the effectiveness of core coolant monitoring system（CCMS） of CPR1000（improved Chinese PWR） unit under condition of Medium Loss of Coolant Accident（MLOCA）,and quantitatively analyze the water level calculation difference of two judgement methods of main coolant pump status in the control system,the measuring principle of the CCMS are analyzed.The level and error of CCMS calculation under these two conditions are calculated quantitatively using RELAP5-3D program to simulate the thermal hydraulic part of CPR1000 unit and virtual DCS to simulate the control system.The result shows that two methods both induce large error;the judgement of the core level by operator may be misled in the view of State Oriented Procedure（SOP）. -
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