NRC Approves Amendment No. 5 to Holtec HI-STORM UMAX Spent Fuel Storage System (Certificate of Compliance No. 1040)
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The U.S. Nuclear Regulatory Commission (NRC) has finalized a rule amending its spent fuel storage regulations under 10 CFR Part 72 to incorporate Amendment No. 5 to Certificate of Compliance (CoC) No. 1040, which governs the Holtec International HI-STORM UMAX Canister Storage System. This amendment updates the approved listing of dry cask storage systems used at nuclear power plants across the United States. Amendment No. 5 specifically introduces two new design variants — Version B1 and Version B2 — of the HI-STORM UMAX system. These versions represent updated configurations of the underground maximum capacity dry cask storage system, which is used to store high-level radioactive spent nuclear fuel in a below-grade (partially or fully underground) arrangement. The HI-STORM UMAX system is widely used at U.S. nuclear facilities as an independent spent fuel storage installation (ISFSI). By amending the Certificate of Compliance to include the new B1 and B2 versions, licensees who hold or reference CoC No. 1040 may now use these new design configurations in accordance with the updated technical specifications and conditions set by the NRC. This rule follows standard NRC regulatory procedures for revising approved storage cask listings and takes effect upon publication in the Federal Register, allowing nuclear plant operators to begin using the newly approved design versions subject to applicable license conditions.
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Key Changes
- Amendment No. 5 added to Certificate of Compliance No. 1040 for the Holtec HI-STORM UMAX Canister Storage System
- Two new design versions introduced: Version B1 and Version B2 of the HI-STORM UMAX system
- Updated listing published in 10 CFR Part 72 'List of approved spent fuel storage casks'
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Obligations
What this law requires
Nuclear licensees holding or referencing Certificate of Compliance No. 1040 must update their spent fuel storage system configurations to comply with the technical specifications and conditions for Version B1 and Version B2 of the HI-STORM UMAX system as defined in Amendment No. 5.
Nuclear licensees utilizing the HI-STORM UMAX system must ensure that any newly deployed storage cask configurations use only the approved design variants (Version B1 or Version B2) as specified in Amendment No. 5 to CoC No. 1040.
Licensees must operate the HI-STORM UMAX system in accordance with the updated technical specifications and conditions set by the NRC as part of Amendment No. 5.