第35卷第4期 2015年12月
核科学与工程
Nuclear Science and Engineering
Vol.35
5No.4 Dec.2015
脉冲堆弱源点火实验的蒙特卡罗数值模拟
杨俊云1，肖
刚2，应阳君2
（1.中国工程物理研究院研究生部，北京100088;2.北京应用物理与计算数学究所，北京100094）
摘要：本文采用广义半马尔科夫过程模拟方法模拟了在Caliban脉冲堆，Godiva-I和Godiva-IⅡI脉冲堆上开展的超临界点火实验。得到爆发脉冲等待时闻概率分布，以及与脉冲堆爆发脉冲过程相关的各种物理量的概率分布，如裂变率、缓发中子出射率等。模拟得到的爆发脉冲等待时间概率分布与实验结果符合，所得到的相关物理量自洽，且对于理解脉冲堆点火实验的随机现象提供了参考。通过本文的工作，验证了广义半马尔科夫过程模拟方法在模拟弱超临界系统随机中子场时间演化方面的适用性和正
确性，该方法可以应用于超临界事故评价和分析。关键调：脉冲堆；弱中子源；可持续裂变链
中图分类号：TL411+，4;TL327
文章标志码：A
文章端号：0258-0918(2015)04-0624-09
The Simulation of InitiationExperiments Performed on the
PulseReactorswithMonteCarloMethod YANG Jun-yun',XIAO Gang”,YING Yang-jun
(1. Graduate School of China Academy of Engineering Physics, Bejing 100088, China; 2. Institute of Applied Physics and Computational Mathematics, Beijing 100094, China)
Abstract,A zero-dimensional model is constructed with generalized semi-Markov process method in this paper. The initiation experiments were performed on the pulse reactors Caliban, Godiva-I and Godiva-Il were simulated based on the zero-dimensional model. The probability distributions of burst waiting time and relevant physical quantities, such as the fission rate and the emission rate of delayed neutrons and so on, were obtained. The simulated results of probability distributions of burst waiting time are in accordance with experimental values. Relevant physical quantities are self-consistent. A vivid picture of stochastic process of neutron in multiplying assembly is presented, which is helpful for initiation experiments. It is available and correct to simulate the phenomenon of stochastic process of neutron field in a slightly supercritical system using the generalized semi-Markov process method. The evaluation and analysis of criticality
收稿日期：2014-06-30；修回日期：2014-12-27
基金项目：国家自然科学基金项目(11175025)和中国工程物理研究院基金重点项目(2011A0103009)资助
作者简介：杨俊云（1987-—），男，江西宜春，在读博士研究生，现主要从事反应堆物理研究 624