压水堆燃料组件变形的中子学分析  

Neutronics Analysis of the Fuel-assembly-bowing Effect in Pressurized Water Reactor

作　　者：何明涛 孟晗 李学仲 王欣欣 赵常有 李志军 HE Mingtao;MENG Han;LI Xuezhong;WANG Xinxin;ZHAO Changyou;LI Zhijun(China Nuclear Power Technology Research Institute Co.,Ltd.,Shenzhen of Guangdong Prov.518000,China)

机构地区：[1]中广核研究院有限公司,广东深圳518000

出　　处：《核科学与工程》2024年第5期1178-1185,共8页Nuclear Science and Engineering

摘　　要：压水堆燃料组件在堆芯中受轴向压紧力和横向力作用,同时受高中子注量率辐照,进而产生各种形式的组件变形以及组件内的棒弯曲现象。这会影响局部栅格的慢化条件,进而影响中子学参数以及堆芯运行的安全裕量。本文基于燃料组件变形以及组件内棒弯曲的测量数据,分别建立含不同组件变形及棒弯曲效应的堆芯计算模型,分析组件变形引起的局部慢化条件变化及其对功率分布的影响,尤其是堆芯功率周向分布特性的影响。同时,也评估了不同反射层设计下的影响程度差异。结果表明组件变形对功率分布有影响,且重反射层条件下该效应相对更为显著。In pressurized water reactors,fuel assemblies are subjected to axial compression and lateral forces,as well as high neutron flux,which result in various forms of assembly deformation and rod bending.Assembly deformation affects the local moderation effect,thereby affecting the neutronics parameters and the safety margin of the core.In this study,based on the measurement data,core neutron calculation models with different deformation and bending effects are established to analyze the changes of local moderation effects caused by deformation and the influence on core power distribution.At the same time,the effect of deformation under different reflector designs is also evaluated.The results show that the deformation has an impact on the power distribution,and the effect will be more significant for the heavy-reflector design.

关 键 词：燃料组件 组件变形 棒弯曲 局部慢化 

分 类 号：TL32[核科学技术—核技术及应用]