The U.S. Nuclear Regulatory Commission (NRC) is amending its spent fuel storage regulations by revising the Transnuclear, Inc. (TN) NUHOMS[supreg] HD System listing within the "List of Approved Spent Fuel Storage Casks" to include Amendment No. 1 to Certificate of Compliance (CoC) Number 1030. Amendment No. 1 will modify the CoC to add Combustion Engineering 16x16 class fuel assemblies as authorized contents, reduce the minimum off-normal ambient temperature from - 20[deg]F to -21[deg]F, expand the authorized contents of the NUHOMS[supreg] HD System to include pressurized water reactor fuel assemblies with control components, reduce the minimum initial enrichment of fuel assemblies from 1.5 weight percent uranium-235 to 0.2 weight percent uranium-235, clarify the requirements of reconstituted fuel assemblies, add requirements to qualify metal matrix composite neutron absorbers with integral aluminum cladding, delete use of nitrogen for draining the water from the dry shielded canister (DSC) and allow only helium as a cover gas during DSC cavity water removal operations, and make corresponding changes to the technical specifications.