[en] In order to investigate plutonium utilization in pressurized water reactors, an accurate, spatially explicit computational method is required. Presently available nuclear analysis codes do not meet these criteria. The XSDRN-BURN program was developed to provide the facility of a spatial representation of plutonium fuel utilization for differing core geometries. To this end, the XSDRN computer program was obtained from the Oak Ridge Radiation Shielding Information Center and modified under the study contract