The U.S. Nuclear Regulatory Commission (NRC or the Commission) is amending its spent fuel storage regulations by revising the Holtec International HI-STORM 100 dry cask storage system listing within the "List of Approved Spent Fuel Storage Casks" to include Amendment No. 8 to Certificate of Compliance (CoC) No. 1014. Amendment No. 8 adds a new multipurpose canister (MPC)-68M to the approved models currently included in CoC No. 1014 with two new boiling water reactor fuel assembly/array classes, and a new pressurized water reactor fuel assembly/class to CoC No. 1014 for loading into the MPC-32. In addition, the amendment makes several other changes as described under the "Discussion" heading in the SUPPLEMENTARY INFORMATION section of this document.