The U.S. Nuclear Regulatory Commission (NRC) 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. 6 to Certificate of Compliance (CoC) Number 1014. Amendment No. 6 will modify the CoC to add instrument tube tie rods used for pressurized water reactor 15x15 and 17x17 fuel lattices, for both intact and damaged fuel assemblies, to the approved contents of the MPC-24, MPC-24E, MPC-24EF, MPC-32, and MPC-32F models; and to correct legacy editorial issues in Appendices A and B Technical Specifications.