基于逆动态法的ADS次临界度在线监测方法数值验证  

Preliminary Numerical Verification on ADS Subcriticality Monitoring with Inverse Kinetics Method

作　　者：张潇湘 杨琪[1] 刘超[1] 宋婧[1] 孙光耀[1] ZHANG Xiao-xiang;YANG Qi;LIU Chao;SONG Jing;SUN Guang-yao(Key Laboratory of Neutronics and Radiation Safety,Institute of Nuclear Energy Safety Technology,Chinese Academy of Sciences,Hefei,Anhui,230031,China;University of Science and Technology of China,Hefei,Anhui,230027,China)

机构地区：[1]中国科学院核能安全技术研究所,中子输运理论与辐射安全重点实验室,安徽合肥230031 [2]中国科学技术大学,安徽合肥230027

出　　处：《核科学与工程》2018年第6期944-950,共7页Nuclear Science and Engineering

基　　金：中国科学院国防科技创新基金项目(CXJJ-16Q231),中国科学院战略性先导科技专项(XDA03040000)。

摘　　要：加速器驱动次临界系统(ADS)的次临界度在线监测是ADS运行和安全的核心问题,目前次临界度的测量方法主要有:外推-周期法,跳源法,脉冲中子源法等。本文研究了基于逆动态法的ADS次临界度在线测量方法,并对该法进行初步数值模拟验证。基于临界堆反应性逆动态测量方法,增加外源项的特殊考虑:采用次临界稳态中子通量密度(或功率)及初始次临界度以确定外源,实现适用于次临界堆反应性计算的逆动态求解算法。本文使用欧洲小型加速器驱动的次临界系统PDS-XADS进行数值验证,与动力学程序NTC-2D的计算结果进行对比。结果表明:该方法可有效实现次临界堆的次临界度在线监测。On-line subcriticality monitoring plays the most important role in operation and safety of an accelerator driven subcritical system.Different subcriticality measurement methods are available such as extrapolation-period method,source-jerk method,pulsed neutron source method,etc.In our research,inverse kinetics method is used for on-line subcriticality monitoring simulation of ADS and is verified by code simulation.External neutron source can be calibrated by combining subcritical steady state neutron flux and initial subcriticality,which makes the conventional point kinetics to be extended to subcritical reactor.A subcritical inverse kinetics algorithm is coded and effectively verified by transport kinetics code NTC?2D.The results show that this subcritical inverse kinetics method can be used for on-line subcriticality monitoring of an ADS.

关 键 词：逆动态法 次临界度 在线测量 数值验证 

分 类 号：TL48[核科学技术—核技术及应用]