数值模拟技术在辅助给水系统调试中的应用  

Application of Numerical Simulation in the Commissioning of the Auxiliary Feedwater System

作　　者：丘锦萌 盛美玲 张欣 QIU Jinmeng;SHENG Meiling;ZHANG Xin(Hualong Nuclear Power Technology Co.,Ltd.,System and Layout Department,Beijing 100036,China)

机构地区：[1]华龙国际核电技术有限公司系统与布置所,北京100036

出　　处：《核科学与工程》2024年第5期1094-1099,共6页Nuclear Science and Engineering

摘　　要：辅助给水系统作为压水堆核电厂重要的专设安全系统之一,在设计基准事故工况下导出堆芯余热起到至关重要的作用。辅助给水系统的给水流量能否满足安全功能要求,主要通过核电厂现场调试试验验证的方式完成。辅助给水系统调试中最常见的问题包括单个支路流量不足、各给水支路之间的流量偏差过大等问题。本文从某在建核电厂辅助给水系统调试问题出发,通过FLOWMASTER建立辅助给水系统热工水力模型进行模拟计算。通过数值模拟计算辅助给水系统的流量分配情况,提出合理的扩孔方案解决调试流量不匹配的问题;通过系统阻力分析,诊断出系统可能出现调试问题的具体部件,并最终消除引起流量不匹配问题的原因,并通过单个支路孔板孔径的敏感性分析,获得各支路给水流量和流量不匹配度与单个孔板孔径的函数关系。通过数值模拟技术解决调试中的工程问题,并优化系统方案设计,保证系统满足安全功能要求,同时为后续同类型核电技术的辅助给水系统调试、运行提供技术指导。As one of the most important engineered safety systems for PWR,the auxiliary feedwater system plays a vital role in removing residual heat of the reactor during design base conditions.Whether the flowrate of the feedwater of the auxiliary feedwater system meets the safety function requirements,it is mainly completed by the verification of the on-site commissioning tests of the system.The most common problems in the commissioning of the auxiliary feedwater system include the insufficient flowrate in a single branch and excessive flowrate deviation between each branch.The theme,established and simulated the thermal-hydraulic simulation model in FLOWMASTER,aiming to solve the commissioning testing problems of the auxiliary feedwater system of a certain nuclear power plant in construction.Based on numerical simulation,the theme solved the preoperational testing problems,including the insufficiency of the flowrate and the mismatch of flowrates among each branch.Performed the sensitivity analysis of the orifice aperture in the individual branch and obtained the function between the mismatch of each branch and the diameter of a single orifice.Through numerical simulation,the engineering problems in commissioning are solved,and the system configuration design is optimized to ensure that the system meets the requirements of the system,and at the same time provide technical guidance for the commissioning and operation of the auxiliary feedwater system of the same type of PWR.

关 键 词：辅助给水系统 热工水力模型 给水流量 流量偏差 

分 类 号：TL374[核科学技术—核技术及应用]