摘要
采用蒙特卡罗(MC)方法直接计算深穿透屏蔽问题并在合理的时间内得到可信的结果是非常困难的。基于离散纵标(SN)的减方差方法采用源偏倚和权窗技巧能够有效降低MC方法计算深穿透问题的计数误差。为了一次计算同时优化不同位置的计数,本文研究了基于SN的全局减方差方法,在CAP1400安全壳内辐射场分布计算中进行了应用。数值结果表明,该方法取得了良好的全局减方差效果,可用于复杂几何深穿透问题。
It is a great challenge to obtain reliable results in reasonable time by the Monte Carlo (MC) method in solving the deep-penetration shielding problem. Based on Discrete Ordinate (SN), variance reduction method uses the biased source and weight window technique to decrease MC calculation tally error for the deep-penetration problem. This paper studies global variance reduction (GVR) method based on SN to simultaneously optimize multiple individual tallies located at different positions by one calculation. The GVR method is applied to calculation of radiation field distribution at all locations within the containment of CAP1400. Numerical results show that the GVR method is effective in global variance reduction and suitable for deep-penetration problem with complex geometry.
作者
郑征
周岩
李瑞
ZHENG Zheng;ZHOU Yan;LI Rui(Shanghai Nuclear Engineering Research and Design Institute Co.Ltd.,Shanghai,200233,China;Institute of Applied Physics and Computational Mathematics,Beijing,100190,China)
出处
《核科学与工程》
CAS
CSCD
北大核心
2019年第2期298-302,共5页
Nuclear Science and Engineering
关键词
全局减方差方法
离散纵标方法
蒙特卡罗方法
源偏倚
权窗
Global variance reduction method
Discrete Ordinate method
Monte Carlo method
source biasing
weight window
