Modeling of Subcritical PWR with Fixed Neutron Source Using MP ACT1

摘要

A 2D subcritical fixed source modeling capability was recently implemented in the MP ACT neutronics code. This capability was tested using a variation of VERA Progression Problem 5 with a representative secondary source assembly and appears to provide reasonable flux distribution results. These results indicate a high sensitivity of core flux distribution to secondary source location in the absence of the neutron sources from burned fuel assemblies.