弱源反应堆系统中子随机涨落不确定度分析

Uncertainty Analysis of Neutron Stochastic Fluctuation in Weak Source Reactor System

快中子反应堆(快堆)与热中子反应堆(热堆)一代中子时间存在较大差别,因此,两者在弱(中子)源条件下的反应堆启动以及中子增殖过程中随机性涨落的不确定度相差较大.本文从系统中子概率分布函数所满足的微分方程出发,对k=常数系统中子随机涨落不确定度进行了理论分析,解释了快堆的安全风险性要大于热堆的物理原因.

Due to the large difference of neutron generation time between fast neutron reactor (fast reactor) and thermal neutron reactor (thermal reactor),the uncertainties of random fluctuations of the fast reactor and the thermal reactor during reactor start-up and neutron multiplication is quite different.Starting from the differential equation satisfied by the neutron probability distribution function in the system,the uncertainty of neutron random fluctuation in the k=constant system is analyzed theoretically.It is explained that the safety risk of fast reactor is greater than that of hot reactor.