The U.S. Nuclear Regulatory Commission (NRC) is amending its spent fuel storage regulations by revising the Transnuclear, Inc. (TN), Standardized NUHOMS[supreg] System listing within the "List of Approved Spent Fuel Storage Casks" to include Amendment No. 10 to Certificate of Compliance (CoC) Number 1004. Amendment No. 10 will modify the cask design to add a dry shielded canister (DSC) designated the NUHOMS[supreg]-61BTH DSC, add a dry shielded canister designated the NUHOMS[supreg]-32PTH1 DSC, add an alternate high-seismic option of the horizontal storage module (HSM) for storing the 32PTH1 DSC, allow storage of Westinghouse 15X15 Partial Length Shield Assemblies in the NUHOMS[supreg]-24PTH DSC, allow storage of control components in the NUHOMS[supreg]-32PT DSC, and add a new Technical Specification, which applies to Independent Spent Fuel Storage Installation sites located in a coastal marine environment, that any load bearing carbon steel component which is part of the HSM must contain at least 0.20 percent copper as an alloy addition.