高产额脉冲堆爆发脉冲过程力学特性数值模拟

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英文篇名：Numerical simulation of stress properties on high-yield fast-neutron-burst reactor in super-prompt-critical condition 作者：陈硕 ; 郑春 ; 杜金峰 英文作者：Chen Shuo;Zheng Chun;Du Jinfeng;Institute of Nuclear Physics and Chemistry,CAEP;Key Laboratory of Neutron Physics,CAEP; 关键词：热冲击应力 ; 脉冲堆 ; 铀钼合金 ; 超临界脉冲 ; 圆柱型燃料 英文关键词：thermal shock stress;;fast burst reactor;;U-Mo;;super-prompt-critical;;cylindrical fuel component 中文刊名：QJGY 英文刊名：High Power Laser and Particle Beams 机构：中国工程物理研究院核物理与化学研究所;中国工程物理研究院中子物理学重点实验室; 出版日期：2019-05-20 09:34 出版单位：强激光与粒子束 年：2019 期：v.31;No.263 基金：国家自然科学基金项目(11775197) 语种：中文; 页：QJGY201905018 页数：6 CN：05 ISSN：51-1311/O4 分类号：91-96

摘要

脉冲堆的性能主要受机械冲击引起的物理损伤的限制。高产额脉冲堆比CFBR-Ⅱ等金属铀脉冲堆追求更窄的脉冲宽度和更高的裂变产额,脉冲过程应力变化更加剧烈。为了获得高产额脉冲堆爆发脉冲过程中应力应变的分布,为新型脉冲堆设计和安全分析提供技术支持,基于圆柱型的铀钼合金快中子脉冲堆GodivaⅣ,以点堆方程以及MC(蒙特卡罗)方法对其中子产额以及功率分布进行了计算。并建立了快中子脉冲堆GodivaⅣ的三维模型,基于已知功率分布条件,利用有限元计算软件ANSYS Mechanical对其脉冲动态过程进行了瞬态的有限元计算,得到了GodivaⅣ圆柱型金属燃料在超临界脉冲爆发条件下的应力响应特性。
        The performance of fast burst reactor(FBR)is mainly restricted by the physical damage caused by the mechanical shock.The smaller burst width and larger fission yield in high-yield FBRs indicate more significant stress variation.To obtain the temporal and spatial distributions of stress/strain of burst in the highyield FBR and to provide technical support for the design and safety analysis of new-type FBRs,the neutronic calculation based on the point kinetic approximation and Monte Carlo method is first performed to obtain the temporal and spatial distributions of fission power in the cylindrical FBR Godiva IV,the three-dimensional thermoelastic behavior in the burst is then simulated by using the finite element method software ANSYS Mechanical.The dynamic response of stress in material component is obtained and analyzed.The results show that the cylindrical fuel will suffer a stress wave during the burst and the maximum stress occurs in the radial cracking of central fuel rings.

引文

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