反射中子对金属快中子脉冲堆特性参数的影响研究  

Effect of reflected neutrons for fast pulsed reactor characteristics with metallic nuclear fuel

作　　者：郭树伟 陈珍平[1] 江新标[2] 李达[2] 张科营[2] 张信一[2] 王立鹏[2] 谢金森[1] 于涛[1] GUO Shuwei;CHEN Zhenping;JIANG Xinbiao;LI Da;ZHANG Keying;ZHANG Xinyi;WANG Lipeng;XIE Jinsen;YU Tao(School of Nuclear Science and Technology,University of South China,Hengyang 421001,China;State Key Laboratory of Intense Pulsed Radiation Simulation and Effect,Northwest Institute of Nuclear Technology,Xi'an 710024,China)

机构地区：[1]南华大学核科学技术学院,衡阳421001 [2]西北核技术研究所强脉冲辐射环境模拟与效应国家重点实验室,西安710024

出　　处：《核技术》2024年第6期121-128,共8页Nuclear Techniques

基　　金：湖南省自然科学基金(No.2022JJ40345);湖南省教育厅科学研究项目(No.19A422)资助。

摘　　要：快中子脉冲堆对墙壁反射中子比较敏感,反射中子会改变快中子脉冲堆波形,当反射中子较多时可能会对脉冲堆的运行安全造成不利影响。本文建立了考虑墙壁反射中子效应的点堆动力学方法、蒙特卡罗中子学计算方法和ANSYS热力学计算方法三者耦合的“核-热-力”耦合方法,并对含有墙壁反射中子效应的快中子脉冲堆Godiva-Ⅰ瞬态过程进行分析。结果表明:反射中子使脉冲后沿提高,使冲坪时的反应性变低,使堆芯位移、应力有所提高。[Background]Fast neutron pulsed reactors are sensitive to wall scattering neutrons,and their waveforms are changed by reflected neutrons.In addition,their operation may be adversely affected when there are too many reflected neutrons.[Purpose]This study aims to solve the problem of fast neutron pulse reactor wall reflection neutron.[Method]The point reactor kinetic method containing the reflection effect,Monte Carlo method,and ANSYS were combined to analyze the Godiva-I transient process in fast neutron pulsed reactor with wall-reflected neutron effect.Firstly,the quench coefficient of the fast neutron pulsed reactor was calculated.Then,the point reactor kinetic method containing the reflection effect was established.Finally,the thermal power obtained from the neutronics calculation was combined with the ANSYS thermal-mechanical module to establish the thermal-mechanical calculation method for fast neutron pulsed reactor,and the effect of wall-reflected neutrons was analyzed and calculated.[Results]The results show that the reflected neutrons increased the rear edge of the pulse.The reactivity decreases when the flat is washed whilst the core displacement and stress are improved.[Conclusions]The method established in this study can reasonably explain the phenomenon of reduction in attenuation and the increase in power after pulse.

关 键 词：快中子脉冲堆 反射中子 核热力耦合 点堆动力学 安全分析 

分 类 号：TL364[核科学技术—核技术及应用]