Investigation into the effects of zircaloy-4 on the neutronics of low enriched uranium MNSR core

► A final multiplication factor of the Al shim tray design was recorded as 1.00389 ± 0.0006. ► A final multiplication factor of the Zr-4 shim tray design was recorded as 1.00468 ± 0.0006. ► The flux profile investigated was found to follow the same pattern for both designs. ► The βeff was found to be 8.39 ± 0.0006 × 10−3 for the Al shim tray design. ► The βeff was found to be 8.43 ± 0.0006 × 10−3 for the Zr-4 shim tray design.