摘要
为了研究反应堆弱中子源启动过程中的中子数密度和缓发中子先驱核随机涨落现象,我们推导和建立了点堆随机动力学方程组,在传统的点堆动力学方程组中引入了伊藤随机项。为了验证方程组的伊藤解方法和计算精度,我们在简化物理条件和方程形式下,对定态系统的中子数密度分别用随机动力学方程伊藤解和中子数概率分布函数解析解进行了对比分析。结果表明,伊藤解是一种有效、具有较高计算精度的方法,计算精度满足sigma的标准,置信水平在95%以上。
In the study of the random fluctuation of the neutron and the delayed neutron precursor number density during the start-up of a weak neutron source reactor,we introduce the stochastic calculus theory into reactor physics. In order to verifty the Ito solution conditions and equation forms,the neutron number density of the stationary system is analyzed by comparing the Ito solution of the stochastic dynamic equations and the analytic solution of the probability distribution of the neutron number. The results show that Ito solution is an effective and highly accurate method,and the calculation accuracy meets the 2 standard deviations. The confidence level is above 95%.
引文
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