TMCC: A TRANSIENT THREE-DIMENTIONAL NEUTRON TRANSPORT CODE BY THE DIRECT SIMULATION METHOD

摘要

A direct simulation method (DSM) is applied to solve the transient three-dimensional neutron tran sport problems. DSM is based on the Monte Carlo method, and can be considered as an applicatio n of the Monte Carlo method in the specific type of problems. In this work, the transient neutronic s problem is solved by simulating the dynamic behaviors of neutrons and precursors of delayed ne utrons during the transient process. DSM gets rid of various approximations which are always nee essary to other methods, so it is precise and flexible in the requirement of geometric configuration s, material compositions and energy spectrum. In this paper, the theory of DSM is introduced first, and the numerical results obtained with the new transient analysis code, named TMCC (Transient Monte Carlo Code), are presented.