The U.S. Nuclear Regulatory Commission is amending the entry for Holtec's HI-STORM Flood/Wind (FW) system in its list of approved spent fuel storage casks. The change adds Amendment No. 10 to the system's Certificate of Compliance No. 1032.
The amendment brings several enhancements to the dry storage system. These include the HI-STORM FW Extended Configuration, a method for building site-specific loading patterns that allow higher heat-load limits per canister and per cell, and a radiological fuel-qualification methodology.
The amendment also cuts the minimum cooling time needed for certain multi-purpose canister models, based on updated evaluations, and revises the missile-impact analysis method so site-specific credit may be taken for the HI-TRAC VW water-jacket shell. A minor editorial clarification is included as well.
The direct final rule takes effect October 6, 2026, unless significant adverse comments arrive by August 24. The action amends 10 CFR Part 72 under Docket NRC-2026-2476.
The amendment expands the approved configurations and loading flexibility of a widely used dry storage system for spent fuel.
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