The influence of homogenization on the calculation of the sensitivity volume of a BWR incore detector

Abstract

By performing two-group, X- Y, S 4 transport theory calculations with the albedo boundary condition, the effect of heterogeneities on the BWR incore detector sensitivity volume has been investigated. The albedo distribution along the boundary of the control volume is obtained using a two-group, homogeneous, X- Y diffusion model. Different degrees of homogenization have been examined. Investigation shows that a cell-homogeneous model, with separated bypass region and inner water gap, is a viable alternative to the heterogeneous approach. This finding contradicts earlier predictions of a need for a heterogeneous model.