Reactivity and flux calculations using MCNP for heavy-water experiments in the ZED-2 critical facility using low-enriched uranium fuel bundles

Experiments were performed in the ZED-2 (Zero Energy Deuterium) critical facility at AECL Chalk River Laboratories using a 24-cm pitch square lattice of 52 channels of heavy-water-moderated ACR-LEU and CANFLEX-LEU 43-element low-enriched uranium fuel bundles. These fuel bundles were cooled with H 2O, air (void) or a checkerboard pattern of H2O and air coolants. MCNP was used to calculate the reactivity and global flux distributions, which were …