超温ΔT紧急停堆整定值优化研究

Optimization Analysis of Overtemperature ΔT Set-point

对超温ΔT停堆信号中的关键参数进行优化,通过功率运行控制棒组(RCCA)失控抽出事故分析对优化后的超温ΔT停堆信号进行验证研究,采用热工水力子通道分析程序和瞬态分析程序对超温ΔT整定值设定进行分析,新的整定值将对停堆时间、最小偏离泡核沸腾比(DNBR)和反应性引入速率限值方面产生影响。分析结果表明,优化后的整定值在保证反应堆安全裕量的前提下增加了运行裕量,提高了反应堆经济性并能满足反应堆安全运行的要求。

For the plant operation which the safety margin is enough,it is positive to optimize the reactor trip signal set-point which could increase the efficiency of nuclear power plant.Overtemperature ΔT set-point optimization analysis is processed based on the accident of uncontrolled RCCA(Rod Cluster Control Assembly) bank withdrawal at power.Thermal-hydraulic sub-channel analysis code and transient analysis code are introduced into the research.The new set-point will influence the reactor trip time,DNBR and the limit of reactivity insertion rate.The result shows that the optimized overtemperature ΔT set-point leads to increase the operational margin and improve the economy efficiency when the safety margin remains large enough.The analysis provides the way to improve the reactor economy through optimizing the reactor trip signal set-point.