快堆堆芯组件抗震分析方法研究

摘要

Safety evaluation under the earthquake of assembly is one of the most important issues, which is paid great attention by National Nuclear Safety Administratioin. In the paper, firstly, the mode and seismic responses of one row assemblies are researched by the finite element method CAST3M. By comparison, the FSI influence is very notable. Based on this, considering the FSI influence, the dynamic responses of 2D one row assemblies under the horizontal seismic load are researched, and the displacement and impact force between assemblies are calculated, which will offer input for structural integrity estimate, and important referenced meaning for CDFR design.%快堆堆芯组件的抗震安全评价是国家核安全局审评的重要内容,也是中国实验快堆(CEFR)取得装料许可证的必要条件之一.本文使用有限元分析软件CAST3M[1],首先对堆芯单排组件在空气中及液钠中进行抗震响应分析,经比较可以看出,考虑流固耦合作用对计算结果的影响非常显著.在此基础上,对液钠及组件进行单独建模,考虑流固耦合的作用,对二维单排反应堆堆芯组件模型进行水平地震激励下的动态分析,得到组件各时刻的位移响应及组件之间和组件与围板之间的碰撞力响应.经过计算结果的比较,可看出本文中的计算方法及结果是可接受的.对堆芯组件在地震下的结构完整性、控制棒的可插人性等评价提供输入,同时为堆芯的设计优化提供建议和参考,对中国原型快堆的设计也具有一定的参考意义.