压水堆燃料组件轴向刚度模型及影响因素分析研究  

Analysis and Research on Axial Stiffness Model and Influencing Factors of PWR Fuel Assembly

作　　者：金渊 古成龙 田玮 张玉相 李伟才 Jin Yuan;Gu Chenglong;Tian Wei;Zhang Yuxiang;Li Weicai(China Nuclear Power Technology Research Institute Co.,Ltd.,Shenzhen,Guangdong,518038,China)

机构地区：[1]中广核研究院有限公司,广东深圳518038

出　　处：《核动力工程》2024年第6期112-120,共9页Nuclear Power Engineering

摘　　要：目前国内商业压水堆燃料组件事故工况轴向分析模型主要依赖国外技术转让,在理论机理研究深度上明显不足。本文从燃料组件的基本结构特征出发,基于基本的力学理论,首先建立较小的基本结构特征单元模型并分析其轴向刚度,进而合理推广该基本结构模型并建立整体的燃料组件轴向分析模型。基于提出的分析模型,开展了格架层数、夹持系统以及导向管厚度三方面的轴向刚度敏感性分析,分析结果表明格架层数与组件轴向刚度呈负相关性,格架夹持力影响燃料棒滑移力阈值,导向管厚度增加引起组件轴向刚度增加。本文研究结果可为新型燃料组件事故工况轴向模型研究提供新的思路。Currently,the axial analysis model for domestic commercial PWR fuel assembly accident condition mainly relies on foreign technology transfer,and the theoretical mechanism research depth is obviously insufficient.Based on the basic structural characteristics of fuel assembly and the basic mechanical theory,a small basic structure element model is established in this paper and its axial stiffness is analyzed,and then the basic model is reasonably extended to establish the entire fuel assembly axial analysis model.With the obtained analysis model,the sensitivity analysis of axial stiffness is conducted from three aspects of grid number,clamping system and guide thimble thickness.The analysis results show that the number of grid is negatively correlated with the axial stiffness of the assembly,the clamping force of the grid affects the sliding force threshold of the fuel rod,and the axial stiffness increases with the guide thimble thickness.The research results of this paper can provide new ideas for axial model research of new type fuel assembly under accident conditions.

关 键 词：燃料组件 轴向刚度 分析模型 敏感性 

分 类 号：TL352.1[核科学技术—核技术及应用]