直接三维中子输运特征线法并行计算软件的实现

作为中子输运问题的一种重要确定论方法，特征线法（MOC）具有强几何适应性、计算流程简洁、易于大规模并行的优点。ANT-MOC是自主开发的中国数值反应堆1.0（CVR1.0）中的三维特征线法中子输运计算程序，主要用于压水堆、快堆的堆芯输运计算。ANT-MOC支持基于构造实体几何（CSG）的复杂几何建模、高效的用户输入方式、面向矩形/六边形网格的射线追踪算法，以及基于轨迹链分解的并行算法和负载平衡策略。在国产超算上，ANT-MOC可以扩展到约10万处理器核，并行效率在50%以上。针对压水堆、快堆计算问题进行验证和参数敏感性分析，结果表明ANT-MOC计算结果具有较好的稳定性和准确度。

Parallel Implementation of Direct 3D Neutron Transport Method of Characteristics

As an important deterministic method for the neutron transport problem, the method of characteristics (MOC) has many advantages of strong geometric adaptability, simple calculation diagram, and easy large-scale parallel. ANT-MOC is a self-developed three-dimensional MOC neutron transport code in the China Virtual Reactor 1.0 (CVR1.0), which is mainly used for steady state core transport calculations of pressurized water reactor (PWR) and fast breeder reactor (FBR). ANT-MOC supports complex geometric modeling based on constructed solid geometry (CSG), efficient user input methods, ray tracing algorithms for rectangular/hexagonal grids and parallel algorithms and load balance based on trajectory chain decomposition. On domestic supercomputers in China, ANT-MOC can scale to about 100 000 processor cores to reach a parallel efficiency above 50%. The verification and parameter sensitivity analysis were conducted with PWR and FBR core calculation problems. The results show that the calculation results of ANT-MOC can achieve good stability and accuracy.