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

What it does

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).

The Nuclear Regulatory Commission's summary, as published in the Federal Register.

What changed in the regulation

1 part of Title 10 of the Code of Federal Regulations:

10 CFR 72

Wording on eCFR: the day before it took effect and from the day it took effect (first part listed).

Compared with

The Nuclear Regulatory Commission has published 34 final rules in 2026 so far, compared with 28 in all of 2025.

Counted by the Tribune from Federal Register records since Jan. 1, 2025.

Before this

1 earlier Federal Register document under regulation identifier 3150-AL66 since Jan. 1, 2025.

• April 2, 2026 Proposed rule. List of Approved Spent Fuel Storage Casks: Holtec International HI-STORM UMAX Canister Storage System, Certificate of Compliance No. 1040, Amendment No. 5

Since then:

• June 1, 2026 Direct final rule; confirmation of effective date. List of Approved Spent Fuel Storage Casks: Holtec International HI-STORM UMAX Canister Storage System, Certificate of Compliance No. 1040, Amendment No. 5

What happens next and when

This direct final rule is effective June 16, 2026, unless significant adverse comments are received by May 4, 2026. If this direct final rule is withdrawn as a result of such comments, timely notice of the withdrawal will be published in the Federal Register. Comments received after this date will be considered if it is practical to do so, but the NRC is able to ensure consideration only for comments received on or before this date. Comments received on this direct final rule will also be considered to be comments on a companion proposed rule published in the Proposed Rules section of this issue of the Federal Register.

The agency's dates, word for word.

Check it yourself

• The document in the Federal Register
• Docket NRC-2026-0562 on Regulations.gov
• Title 10 on eCFR

The record as published

Source: the Federal Register (public domain). The document in the Federal Register