NRC Confirms Effective Date for Holtec HI-STORM UMAX Spent Fuel Storage Cask Approval
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This rule confirms that Amendment No. 5 to Holtec International’s HI-STORM UMAX spent fuel storage cask approval will take effect on June 16, 2026. The amendment updates the NRC’s approved list of spent fuel storage casks under Certificate of Compliance No. 1040. The practical impact is narrow. It mainly affects nuclear power operators, Holtec, and compliance teams involved in dry storage of spent nuclear fuel. They should use the updated certificate, technical specifications, and NRC safety evaluation when planning or documenting use of the HI-STORM UMAX system.
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Key Changes
- Confirms June 16, 2026 as the effective date for the direct final rule
- Adds Amendment No. 5 for Holtec’s HI-STORM UMAX system to the approved spent fuel storage cask listing
- Makes updated technical specifications and the NRC safety evaluation available through ADAMS
Obligations
What this law requires
Entities using the Holtec International HI-STORM UMAX Canister Storage System for spent fuel storage must rely on Certificate of Compliance No. 1040 as amended by Amendment No. 5, including the associated technical specification changes and NRC safety evaluation, once the amendment is effective.
When contacting the NRC or seeking information about this action, interested parties should reference Docket ID NRC-2026-0562 and use the listed NRC public document access channels, including ADAMS Package Accession No. ML26128A289 for Amendment No. 5 materials.