This study aims to perform a neutronic analysis of a Thorium Oxide (TOX) fuel cell design with varying enrichments of U-235 isotope for application in the core of a Pressurized Water Reactor (PWR) with a thermal power output of 300 MWth. The reactor core is analyzed under two conditions: fully inserted control rods (100%) and fully withdrawn control rods (0%). The fuel used is a (Th, U)O₂ mix…