计算组件变形反应性的虚拟密度理论研究

摘要

The assembly deformation introduces one of the most important reactivity feedbacks in fast neutron reactor .To evaluate the reactivity caused by assembly geome-try deformation , the virtual density theory was applied . In this theory , the virtual material density was changed instead of changing the geometry in modeling the assembly deformation .Compared with existing methods ,this theory has better geometric adapta-bility and better efficiency .A series of verifications show that the virtual density theory has good precision and efficiency in evaluating the assembly deformation reactivity .%组件变形引起的反应性变化是快中子反应堆中重要的负反馈效应.为精确快速评价组件几何改变带来的反应性变化,本文使用虚拟密度理论来处理组件几何变形问题.该理论使用材料的密度变化来等效几何的变化,与现有的方法相比具有更好的几何适应性及更高的计算效率.数值验证结果表明:虚拟密度理论具有很好的计算精度,可用于组件变形反应性的计算.