摘要: 基于非结构网格的有限元方法具有很好的几何适应性，目前已用于求解反应堆物理问题，但当前的有限元程序基于手工描述的几何建模和网格划分非常繁复，很大程度上制约了该方法在反应堆物理数值计算中的应用。利用商业CAD前处置软件ICEM-CFD对三维堆芯几何做四面体或六面体网格剖分，对二维堆芯几何做三角形或四边形网格剖分，并开发了基于有限元方法的核噪声分析用中子学计算主程序。通过基准例题对程序进行了通量、伴随通量、k_eff/k_eff^*等稳态参数计算能力测试，测试表明该程序稳态参数计算结果是可信的。最后，对国际原子能机构（IAEA）发布的三维压水堆基准例题进行了中子噪声频谱计算，给出了给定频点下的噪声分布。


The finite element method based on unstructured mesh has good geometry adaptability. It has been used to solve reactor physics problems, manual description of geometric modeling and meshing makes the current finite element code very complicated. It greatly restricts the application of this method in the numerical calculation of reactor physics. Using the CAD pre-processing software ICEM-CFD, tetrahedral or hexahedral mesh subdivision of 3D core geometry is performed, triangular or quadrilateral mesh subdivision of 2D core geometry is performed, the main code of neutron calculation for nuclear noise analysis based on finite element method is developed. The steady state parameters such as flux, adjoint flux and k_eff/k_eff^* are calculated and tested through benchmark problem, the test results show that the calculation results of the steady state parameters of this code are credible. Finally, the neutron noise spectrum is calculated for the 3D PWR benchmark problem published by IAEA, and the noise distribution under given frequency is given.