反应堆动态参数的蒙特卡罗计算研究

Calculation of Reactor Kinetic Parameters with Monte Carlo Method

介绍缓发中子有效份额(βeff)、有效中子代时间(Λeff)和本征值的概念及其蒙特卡罗程序计算方法。采用Prompt Method方法计算得到βeff;微扰法得到Λeff;采用瞬发中子密度衰减直接拟合法和间接求解法得到本征值;将各种反应性状态下的拟合得到临界c本征值,并与实验测量的c值进行比对,结果符合很好;并对动态参数蒙特卡罗程序计算的各种方法进行不确定度分析。

Basic conceptions of kinetic parameters,including effective delayed neutron fraction（）,effective neutron generation time（） and α eigenvalue,and Monte Carlo calculation methods for these values are systematically introduced in this paper.is obtained with a ＂Prompt Method＂.Perturbation method is chosen to obtain.And then α eigenvalue is obtained by two ways,（i） prompt neutron density attenuation,in other words ＂direct simulation of time evolvement＂,（ii） indirect method using the result of kp and neutron generation time.Linear fitting is used to get the critical αc eigenvalues which match well with experimental ones.And uncertainties of kinetic parameters with different methods using Monte Carlo method are also analyzed.