List of Approved Spent Fuel Storage Casks: Holtec International HI-STORM Flood/Wind System, Certificate of Compliance No. 1032, Amendment No. 10
Key claim: The NRC confirmed that Amendment 10 to Holtec’s HI-STORM Flood/Wind spent nuclear fuel storage cask design is approved and takes effect on October 6, 2026.
Abstract
(Rule · Nuclear Regulatory Commission) The U.S. Nuclear Regulatory Commission (NRC) is confirming the effective date of October 6, 2026, for the direct final rule that was published in the Federal Register on July 23, 2026. This direct final rule amended the Holtec International HI-STORM Flood/Wind System listing within the “List of approved spent fuel storage casks” to include Amendment No. 10 to Certificate of Compliance No. 1032.
Why this matters
Cask certificate amendments determine which dry-storage configurations utilities can load at reactor sites, directly affecting on-site spent fuel management costs and operational flexibility while the U.S. lacks a permanent repository. Confirming Amendment 10’s effective date locks in the expanded HI-STORM FW configuration (higher heat loads, revised fuel-qualification methodology) as an approved option for licensees beginning October 6, 2026.