JMCT蒙特卡罗中子-光子输运程序全堆芯pin-by-pin模型的模拟

Simulation of Full-core pin-by-pin Model by JMCT Monte Carlo Neutron-photon Transport Code

摘要: 几何栅元数超过千万、计数达数十亿、模拟粒子数达数百亿规模的反应堆全堆芯pin-by-pin问题是目前国际公认的挑战计算机和计算方法的难题。由于巨大的数据量已超过单核内存的极限，必须进行空间区域分解和数据分解。本文利用基于JCOGIN实体组合几何框架自主开发研制的三维中子光子输运蒙特卡罗程序JMCT，通过空间区域分解和嵌套并行，完成了对大亚湾核电站1号机组反应堆全堆芯pin-by-pin模型的建模和模拟，计算给出了每个pin的注量率分布及其误差。

Abstract: Due to the number of cell over ten millions, the count over billion and the particle mumber over ten billions, the pin-by-pin problem of the full reactor core has become as a challenge for the computers and the computational methods. Since the large memory demand has exceeded the limit of a single CPU, the spatial domain and data decomposition must be considered. JMCT 3-D Monte Carlo neutron and photon transport code which was developed based on the real body combinational geometry toolbox JCOGIN successfully fulfilled the simulation of full-core pin-by-pin model from Dayawan Nuclear Power Station by spatial domain decomposition and the nested parallel computation. The fluence rate distribution and standard deviation of each pin were obtained.