Thermo-hydraulic analysis for SCWR during power-raising phase of startup  

作　　者：CHEN Juan ZHOU Tao HOU Zhousen CHENG Wanxu 

机构地区：[1]Institute of Nuclear Thermal-Hydraulic Safety and Standardization, North China Electric Power University, Beijing, China, 102206

出　　处：《Nuclear Science and Techniques》2012年第3期181-192,共12页核技术（英文）

基　　金：Supported by National Basic Research Program of China (No. 2007CB209804);State Key Laboratory of Reactor System Design Technology (No. 2011-153);the Fundamental Research Funds for the Key Universities (No. 11QX51)

摘　　要：The study of thermal characteristics during startup is one of the most important aspects for safety analysis of supercritical water-cooled reactor(SCWR).According to the given sliding pressure mode of SCWR,thermal analysis on temperature-raising phase and power-raising phase of startup are carried out.Considering the radial heterogeneity of power distribution,thermal characteristics for different assemblies during startup are also put forward.The results show that,during temperature-raising phase with core power increased only,the temperature of moderator,coolant and fuel cladding in inner assemblies are increased with little amplitude.During power-raising phase with core power and feed-water flow rate increased,the coolant temperature keeps unchanged,but the moderator temperature is decreased.With a greater variation of power,fuel cladding temperature shows a greater increase.Furthermore,considering the uneven distribution of radial power,thermo-hydraulic characteristics with uneven cladding temperature distribution shows a certain horizontal heterogeneity for different fuel assemblies,which becomes serious as flow rate and power increase.By adjusting flow rate distribution in different fuel assemblies or changing power setting during startup,the cladding temperature difference could be effectively reduced,which provides a certain reference for startup optimization of SCWR.The study of thermal characteristics during startup is one of the most important aspecrs for safety analysis of supercritical water-cooled reactor （SCWR）. According to the given sliding pressure mode of SCWR, thermal analysis on temperature-raising phase and power-raising phase of startup are carried out. Considering the radial heterogeneity of power distribution, thermal characteristics for different assemblies during startup are also put forward. The results show that, during temperature-raising phase with core power increased only, the temperature of moderator, coolant and fuel cladding in inner assemblies are increased with little amplitude. During power-raising phase with core power and feed-water flow rate increased, the coolant temperature keeps unchanged, but the moderator temperaWxe is decreased. With a greater variation of power, fuel cladding temperature shows a greater increase. Furthermore, considering the uneven distribution of radial power, thermo-hydraulie characteristics with uneven cladding temperature distribution shows a certain horizontal heterogeneity for different fuel assemblies, which becomes serious as flow rate and power increase. By adjusting flow rate distribution in different fuel assemblies or changing power setting during startup, the cladding temperature difference could be effectively reduced, which provides a certain reference for startup optimization of SCWR.

关 键 词：热工水力分析 启动过程 超临界水 堆功率 高阶段 冷却液温度 升温阶段 内部组件 

分 类 号：TL353.13[核科学技术—核技术及应用] TP316[自动化与计算机技术—计算机软件与理论]