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Final Rule

List of Approved Spent Fuel Storage Casks: Holtec International HI-STORM UMAX Canister Storage System, Certificate of Compliance No. 1040, Amendment No. 5

Agency
NRC
Document Number
2026-06373
Published
April 2, 2026
Effective Date
June 16, 2026

Abstract

The U.S. Nuclear Regulatory Commission (NRC) is amending its spent fuel storage regulations by revising the Holtec International HI- STORM UMAX Canister Storage System listing within the "List of approved spent fuel storage casks" to include Amendment No. 5 to Certificate of Compliance No. 1040. Amendment No. 5 revises the certificate of compliance to include two new versions of the HI-STORM UMAX design (Version B1 and B2).

Federal Register Source

This document is published by the Office of the Federal Register, National Archives and Records Administration. Access the full regulatory text, preamble, and docket comments below.

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Frequently Asked Questions

What is the 2026-06373 Federal Register document?
Document 2026-06373 is a Final Rule published by the Nuclear Regulatory Commission in the Federal Register on April 2, 2026, with an effective date of June 16, 2026. The U.S. Nuclear Regulatory Commission (NRC) is amending its spent fuel storage regulations by revising the Holtec International HI- STORM UMAX Canister Storage System listing within the "List of approved spent fuel storage casks" to include Amendment No. 5 to Certificate of Compliance No. 1040. Amendment No. 5 revises the certificate of compliance to include two new versions of the HI-STORM UMAX design (Version B1 and B2). View the original at https://www.federalregister.gov/documents/2026/04/02/2026-06373/list-of-approved-spent-fuel-storage-casks-holtec-international-hi-storm-umax-canister-storage-system.
Is document 2026-06373 an economically significant rule?
No. Document 2026-06373 is not classified as economically significant under Executive Order 12866. Economically significant rules require OIRA review and are estimated to have impacts of $100 million or more per year.

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