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微扰计算可用于估计由特定反应堆参数扰动引起的有效增殖因子的变化,同时是反应堆敏感性分析及不确定性分析的基础。传统蒙特卡罗(蒙卡)微扰计算方法扰动阶数低,不易于向高阶推广,且由于没有考虑系统扰动引起的源扰动效应,计算误差较大。为了克服传统方法的缺点,提高蒙卡微扰计算的精度,对考虑源扰动效应的高阶蒙卡微扰方法进行研究。数值计算结果说明:源扰动效应在蒙卡微扰计算中起着重要的作用,不考虑源扰动效应会带来较大的计算误差;随着计算阶数的增加,微扰计算的结果更加精确。
Perturbation calculations can be used to estimate changes in effective proliferation factors caused by perturbations of specific reactor parameters and at the same time as a basis for reactor sensitivity analysis and uncertainty analysis. The traditional Monte Carlo (Monte Carlo) perturbation calculation method has low perturbation order and is not easy to be generalized to higher order. Since the perturbation caused by system disturbance is not considered, the calculation error is larger. In order to overcome the shortcomings of the traditional method and improve the accuracy of the Monte Carlo perturbation calculation, the high-order Monte Carlo perturbation method considering the source perturbation effect is studied. The numerical results show that the source perturbation plays an important role in the Monte Carlo perturbation calculation, and the perturbation effect will have a large computational error without considering the source perturbation effect. As the calculated order increases, the result of the perturbation calculation will be more accurate .