计算组件变形反应性的虚拟密度理论研究

Virtual Density Theory for Assembly Deformation Reactivity Evaluating

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。

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.