在役核电厂测温旁路阀门阻力特性数值模拟分析

Numerical Analysis on Bypass Mainfold Valve Resistance at In-service NPP

根据国内在役核电厂运行反馈,主系统测温旁路安全1级手动截止阀的阀体阀盖若采用分体式锻造,则阀体与阀盖连接处的唇边焊会发生泄漏或存在泄漏风险,因此需选用阀体阀盖一体化铸造的截止阀进行替代。为了判断一体化铸造阀门的阻力特性能否满足系统的阻力要求,使用CFD软件CFX对一体化阀门的流阻特性进行数值模拟计算,分析所采用替换阀门对测温旁路系统流阻要求的适应性。分析结果表示一体化阀门的流阻特性能满足测温旁路系统要求。

Split forging technology is applied in the manufacture of the globe valve used in the bypass temperature measurement of the reactor coolant system(RCS)in some nuclear power plants.This technology,however,leads to the leakage risk at the lips weld on the connecting point between the deck and body of the valve.Thus,using the integrated-casting valve instead is necessary and moreover,this type of valve should satisfy the requirement of flow resistance characteristic.This work focuses on the analysis for the flow resistance characteristic of the integrated-casting valve based on the numerical CFX simulation.The result shows that the requirement of the flow resistance characteristic of this valve type can be satisfied for the bypass temperature measurement.