List of Approved Spent Fuel Storage Casks: Holtec International HI-STORM UMAX Canister Storage System, Certificate of Compliance No. 1040, Revision 1 to Amendment Nos. 0 Through 2

Document 2025-04624 is a Final Rule published by the Nuclear Regulatory Commission in the Federal Register on March 19, 2025, with an effective date of April 21, 2025. The U.S. Nuclear Regulatory Commission (NRC) is confirming the effective date of April 21, 2025, for the direct final rule that was published in the Federal Register on February 4, 2025. This direct final rule amended the NRC's spent fuel storage regulations by revising the Holtec International HI-STORM UMAX Canister Storage System listing within the "List of approved spent fuel storage casks" to include Revision 1 to Amendment Nos. 0 through 2 to Certificate of Compliance (CoC) No. 1040. Revision 1 to Amendment Nos. 0 through 2 updates the CoC appendix A technical specifications for radiation protection and the associated bases information to clearly articulate the basis for the dose rate limits for the closure lids, modify the dose rate limit values and the description of the location of the dose rate measurements, and make other editorial changes. View the original at https://www.federalregister.gov/documents/2025/03/19/2025-04624/list-of-approved-spent-fuel-storage-casks-holtec-international-hi-storm-umax-canister-storage-system.

No. Document 2025-04624 is not classified as economically significant under Executive Order 12866. Economically significant rules require OIRA review and are estimated to have impacts of $100 million or more per year.