WASHINGTON
September 3, 2026
The Nuclear Commission set October 6 2026 as the effective date for its rule adding 10 to the Holtec HI-STORM Flood/Wind spent fuel cask certificate
“List of approved spent fuel storage casks”
Overview
Rule. 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. (Nuclear Regulatory Commission)
Short history
The Nuclear Regulatory Commission added the Holtec International HI-STORM Flood/Wind System to its list of approved spent fuel storage casks in 2011 under Certificate of Compliance No. 1032. The agency has revised that certificate nine times since then to update design, materials, and operating requirements for the casks. On July 23, 2026, the NRC published a direct final rule that added Amendment No. 10 to the approved list. The rule takes effect on October 6, 2026.
Predictive model
The NRC published a direct final rule on July 23, 2026, that added Amendment No. 10 to the Holtec HI-STORM Flood/Wind System on the list of approved spent fuel storage casks. No comments came in during the review period, so the agency is now confirming the rule takes effect on October 6, 2026. This step clears the updated cask design for use at reactor sites without further rulemaking.
The change sits at the end of a standard NRC approval ladder for cask amendments: application, technical review, proposed rule, public comment window, and final issuance. Once the rule is in force, utilities can load the amended casks if their site licenses allow it. The situation shifts only if the NRC opens a new amendment review, a licensee files a deviation request, or Congress changes the underlying statute.
This process runs on fixed federal timelines. The rule locks in on the stated date unless the agency pulls it before then.
Horizon: effective October 6, 2026, with routine use at licensed sites after that.
Primary sources