压水堆辐照监督理论计算的加速方法及验证  

Acceleration Method and Verification of Theoretical Calculation of Irradiation Supervision for Pressurized Water Reactor

作　　者：叶耀新 赵均 包鹏飞 于超 江娉婷 Ye Yaoxin;Zhao Jun;Bao Pengfei;Yu Chao;Jiang Pingting(China Nuclear Power Technology Research Institute Co.,Ltd.,Shenzhen,Guangdong,518028,China)

机构地区：[1]中广核研究院有限公司,广东深圳518028

出　　处：《核动力工程》2024年第6期30-38,共9页Nuclear Power Engineering

摘　　要：为了改善传统压水堆辐照监督理论计算方法中需要多次物理建模和粒子输运计算及计算效率低的问题,本文基于蒙特卡罗(MC)方法和离散纵标(SN)方法耦合的正向权重一致共轭驱动重要性抽样(FW-CADIS)方法,建立了针对压力容器辐照监督管中子注量计算的加速方法。在某CPR1000机组中开展了计算精度和计算速度的影响因素研究,验证了该方法在不同堆芯参数下的适用性,给出了SN输运模拟参数的建议值;在某CPR1000机组中开展了验证与确认,结果表明,该方法与直接MC方法相比,中子注量率计算的品质因子(FOM)提高约95~181倍;中子注量计算结果与实测测量值的相对偏差不超过8%。因此,本文研究的辐照监督理论计算方法可以较好地提高该问题的计算效率,同时满足工程应用中的计算精度要求。To address the inefficiency inherent in traditional pressurized water reactor irradiation surveillance theoretical calculation methods,which require multiple physical modeling and particle transport calculations,this study introduces an accelerated approach of neutron fluence calculation for pressure vessel irradiation surveillance capsules.The method is based on the Forward-Weighted Consistent Adjoint-Driven Importance Sampling(FW-CADIS)technique,coupling the Monte Carlo(MC)method with the Discrete Ordinates(SN)method.A comprehensive investigation into the influencing factors of computational accuracy and speed was conducted for a CPR1000 pressurized water reactor,validating the applicability of the proposed method under various core parameters and providing recommended values for SN transport simulation parameters.Verification and validation of the proposed method were performed on a CPR1000 pressurized water reactor.The results show that the Figure of Merit(FOM)of neutron fluence rate calculations is improved by approximately 95 to 181 times compared with the direct MC method,with a relative deviation between the calculated neutron fluence and measured values not exceeding 8%.Consequently,the irradiation surveillance theoretical calculation method presented in this study effectively enhances computational efficiency while meeting the precision requirements for engineering applications.

关 键 词：中子注量 辐照监督 压水堆 正向权重一致共轭驱动重要性抽样(FW-CADIS) 蒙特卡罗(MC) 

分 类 号：TL32[核科学技术—核技术及应用]