List of Approved Spent Fuel Storage Casks: TN Americas LLC, NUHOMS® EOS Dry Spent Fuel Storage System, Certificate of Compliance No. 1042, Amendment No. 4

Document 2025-14294 is a Final Rule published by the Nuclear Regulatory Commission in the Federal Register on July 29, 2025, with an effective date of October 14, 2025. The U.S. Nuclear Regulatory Commission (NRC) is amending its spent fuel storage regulations by revising the TN Americas LLC, NUHOMS[supreg] EOS Dry Spent Fuel Storage System listing within the "List of approved spent fuel storage casks" to include Amendment No. 4 to Certificate of Compliance No. 1042. Amendment No. 4 changes the certificate of compliance to incorporate a method to determine new loading patterns, introduce a steel plate composite option, introduce the use of MAVRIC software for a confirmatory run of the HSM-MX dose rates, make technical specification changes for consistency and terminology clarification, make various updated final safety analysis report editorial corrections for consistency and clarification, add measured exposures from past loading campaigns, allow use of a blended Portland cement, change the use of the MX-Loading Crane, and clarify the scenarios under which the maximum heat loads can be reduced. View the original at https://www.federalregister.gov/documents/2025/07/29/2025-14294/list-of-approved-spent-fuel-storage-casks-tn-americas-llc-nuhoms-eos-dry-spent-fuel-storage-system.

No. Document 2025-14294 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.