Uncertainty analysis of criticality safety for the plate type fuel assembly storage rack

► The uncertainty of MCNP system was evaluated using 183 benchmark experiments. ► The criticality for the fuel storage rack was evaluated under the abnormal state. ► The USL analysis was carried out for the fresh and spent fuel storage rack. ► The criticality of the fuel storage racks currently designed satisfy the USL. ► The pitch of the fuel storage rack can be reduced for the efficiency of the space.