RMC程序多普勒展宽舍弃修正功能对堆芯计算的影响研究  

Study on the influence of RMC Doppler Broadening Rejection Correction for reactor core calculation

作　　者：张文鑫 强胜龙 尹强[1] 崔显涛 马党伟 贺涛 张旭 郝江涛 ZHANG Wen-xin;QIANG Sheng-long;YIN Qiang;CUI Xian-tao;MA Dang-wei;HE Tao;ZHANG Xu;HAO Jiang-tao(Nuclear Power Institute of China,Chengdu,Sichuan Prov.610000,China)

机构地区：[1]中国核动力研究设计院,四川成都610000

出　　处：《中国核电》2020年第4期438-442,共5页China Nuclear Power

摘　　要：中子弹性散射在超热能区受靶核热运动影响较大,传统的蒙卡程序在超热区采用自由气体模型处理中子的出射能量和角度,超热区的微观弹性散射截面采用常截面近似(CXS)。CXS忽略共振弹性散射导致共振吸收的低估,为了降低共振弹性散射计算的误差,需要使用多普勒展宽舍弃修正(DBRC)来考虑共振弹性散射效应。基于蒙卡燃耗计算程序RMC,分别在开启DBRC功能与关闭DBRC功能的情况下对秦山二期堆芯进行了建模计算与分析,给出了不同燃耗深度与温度下的k eff与k inf。计算结果表明,忽略共振弹性散射会对k eff与k inf带来正的1~167 pcm影响,且温度越高影响越大。The epithermal neutron is susceptible to the thermal motion of the target nucleus.Traditional Monte Carlo code adopst free gas model to consider the neutron emission energy and angle in epithermal region,the elastic scattering cross sections of epithermal energy range is approximated by a constant(CXS).The neglect of resonance elastic scattering by CXS led to the underestimation of resonance absorption.In order to reduce the calculation error of resonance elastic scattering,it is necessary to use Doppler broadening rejection correction(DBRC)method resonance elastic scattering.In this work,Monte Carlo code RMC was used to model and calculate the core of QinshanⅡwith DBRC function on and DBRC function off.The k eff and k inf at different burnup depths and temperatures are calculated.It is found that the neglect of resonance elastic scattering will bring positive influence of 1~169 on k eff and k inf,and the influence increases as the temperature increases.

关 键 词：DBRC 多普勒效应 RMC 

分 类 号：TM623[电气工程—电力系统及自动化]