SDDM共振方法研究及其在COSINE软件包组件计算程序中的应用

Study on Spatially Dependent Dancoff Method and Its Application in Lattice Physics Code of COSINE Project

在目前的组件设计计算过程中,对于几何的划分越来越精细,受限于传统的共振理论方法,无法对燃料芯块进行精细的分区共振计算。本文基于空间依赖的丹可夫方法(SDDM)开发了用于LATC组件计算程序的共振模块。不同于传统的等价理论,SDDM方法可将燃料栅元的燃料区分成任意数量的细环,然后得到考虑空间效应的各细分环的有效截面。基于SDDM方法研制的共振模块,不仅继承了传统共振理论的速度优势,还可对燃料栅元的芯块进行精细分析,尤其对提高可燃毒物棒的计算精度有重要意义。本文中首先对SDDM的理论进行了描述,然后利用DRAGON程序对基于SDDM方法的共振模块进行了数值验证,结果与参考值符合较好。

For the growing demand of heterogeneity and complexity of assembly design, the detailed geometry description and calculation are becoming more and more important. However the traditional equivalence theory cannot deal with the fuel pellet with fine meshes that limits the precise resonance calculation. As a result, a new resonance module with spatially dependent Dancoff method （SDDM） has been developed. Different from the traditional method, the SDDM method can split the fuel pellet into arbitrary number of annular, then calculate to get the effective cross section of every annular. By applying the SDDM, the new resonance calculation module has the capability to model and analyze the fuel in detail, as well as preserving the high calculation efficiency. The basic theory of SDDM was firstly illustrated in this paper, and then the effect and results of SDDM were also presented. The results show good accuracy and adaptability for the PWR.