耐事故燃料双重非均匀性RPT方法研究  

Research of the RPT method on double-heterogeneity of accident tolerance fuel

作　　者：娄磊[1] 姚栋[1] 柴晓明[1] 于颖锐[1] 王连杰[1] 彭星杰 王晨琳[1] 谢运利 刘勇[1] 肖鹏[1] LOU Lei;YAO Dong;CHAI Xiaoming;YU Yingrui;WANG Lianjie;PENG Xingjie;WANG Chenlin;XIE Yunli;LIU Yong;XIAO Peng(National Key Laboratory of Science and Technology on Reactor System Design Technology,Nuclear Power Institute of China,Chengdu 610213,China)

机构地区：[1]中国核动力研究设计院核反应堆系统设计技术重点实验室,成都610213

出　　处：《核技术》2020年第8期20-24,共5页Nuclear Techniques

基　　金：国家自然科学基金(No.1170051016);四川省青年基金(No.2016JQ0045)资助。

摘　　要：采用体积均匀化方法计算含有弥散燃料或弥散可燃毒物的双重非均匀性的系统会带来一定的计算偏差。传统反应性等效物理变换方法(Reactivity-equivalent Physical Transformation,RPT)可以用来处理弥散燃料以及吸收截面随燃耗变化不剧烈的可燃毒物,但对于硼等吸收截面随燃耗变化剧烈的可燃毒物,传统RPT方法也会带来较大的计算偏差。本文对新型RPT方法进行了初步探索,使其不仅适用于传统RPT方法适用的弥散燃料和弥散可燃毒物类型,也适用于硼等吸收截面随燃耗变化相对剧烈的可燃毒物,为RPT方法的扩展和应用提供思路和借鉴。[Background] The traditional volumetric homogenization method(VHM) for the calculation of double heterogeneous system with dispersed particle fuel or burnable poison will bring a certain calculation deviation.[Purpose] This study aims to explore the traditional reactivity-equivalent physical transformation(RPT) method applied to the calculation of infinite neutron multiplication factor(kinf) for the accident tolerance fuel. [Methods] First of all, grid cell containing B4C poison particles in grain model(GM) and VHM model was built to calculate and compare the variation of kinf. Then, the RPT method was employed to treat dispersed particle-type fuel and dispersed particle-type burnable poisons. Finally, a new RPT method with assumption that all the fuel particles were sealed in an annular region in the matrix with the same center of the pellet was implemented to calculate kinf for various accident tolerance fuel. [Results] Comparison results show that the new RPT method not only can treat dispersed fuel particles and burnable particles with similar effect of traditional RPT, but also suits for strong absorber dispersed particle-type burnable poisons that the traditional RPT method is ineffective. [Conclusions] The new RPT method can solve the double non-uniformity problem of dispersed fuel and dispersed burnable poison, providing ideas and reference for the expansion of RPT method to strong absorber dispersed particle-type burnable poisons.

关 键 词：耐事故燃料 双重非均匀性 传统RPT方法 新型RPT方法 

分 类 号：TL3[核科学技术—核技术及应用]