快堆控制棒组件非均匀效应修正方法研究  

Study on Heterogeneous Effect Correction Methodsof Control Rod Assembly in Fast Reactor

作　　者：宋英韵 胡赟[1] 张崇 单浩栋 贾晓淳 SONG Yingyun;HU Yun;ZHANG Chong;SHAN Haodong;JIA Xiaochun(Department of Nuclear Engineering Design,China Institute of,Beijing 102413,China)

机构地区：[1]中国原子能科学研究院核工程设计研究所,北京102413

出　　处：《原子能科学技术》2022年第1期31-38,共8页Atomic Energy Science and Technology

摘　　要：控制棒组件是快堆控制系统和安全保护系统的重要组成部分,快堆控制棒价值的准确求解至关重要。基于PASC-5程序的快堆少群均匀化群常数计算中使用直接体积均匀化方式,这会导致控制棒价值严重高估,必须对控制棒组件的非均匀效应进行修正。基于群常数修正的思路,本论研究了体积-通量权重、反应率之比守恒和反应性守恒3种方法在快堆控制棒组件非均匀效应修正中的应用;基于二维特征线程序开发了群常数修正因子计算程序FRHP。通过中国实验快堆算例进行测试验证,修正后的控制棒价值计算结果与MCNP计算的参考结果符合较好,表明3种方法均能对控制棒组件的非均匀效应实现有效修正,其中反应性守恒方法修正效果最好。The control rod assembly is an important part of the fast reactor control system and safety protection system.The accurate solution of the fast reactor control rod worth is very important.The direct volume homogenization method is used in the calculation of the fast reactor few-group homogenization constants based on the PASC-5 code,which will lead to a serious overestimation of the control rod worth,and the heterogeneous effects of the control rod assembly must be corrected.Based on the idea of group constant correction,the applications of three methods including volume-flux weight,reaction rate ratio preservation,and reactivity preservation were studied in the correction of heterogeneous effects of fast reactor control rod assembly in the paper.Based on the two-dimensional characteristic line code,the calculation code named FRHP for the group constant correction was developed.Tested and verified by the China Experimental Fast Reactor case,the corrected control rod worth calculation results are in good agreement with the MCNP calculation reference results,indicating that the three methods can effectively correct the heterogeneous effects of the control rod assembly,among which the reactivity preservation method has the best correction effect.

关 键 词：控制棒价值 非均匀效应 体积-通量权重 反应率之比守恒 反应性守恒 

分 类 号：TL326[核科学技术—核技术及应用]