Data / Federal rules / 2026-13260
List of Approved Spent Fuel Storage Casks: NAC International, Inc., MAGNASTOR® Storage System, Certificate of Compliance No. 1031, Amendment Nos. 16 and 17 and Revisions to Amendment Nos. 0 Through 16
The Nuclear Regulatory Commission published this final rule in the Federal Register on July 1, 2026. It took effect on September 14, 2026. Comments closed on July 31, 2026.
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What the agency says
The U.S. Nuclear Regulatory Commission (NRC) is amending its spent fuel storage regulations by revising the NAC International, Inc. (NAC) MAGNASTOR[supreg] System listing within the "List of approved spent fuel storage casks" to include Amendment Nos. 16 and 17 and revisions to Amendment Nos. 0 through 16 to Certificate of Compliance (CoC) No. 1031. Amendment No. 16 revises the CoC to permit alternate methods for determining the free volume inside a loaded canister and for measuring helium to ensure that Technical Specification limits are met. It also clarifies that mixed loadings of different assembly types or subtypes within a single Transportable Storage Canister (TSC) are acceptable. Amendment No. 17 and revisions to Amendment Nos. 0 through 16 revise the CoC to incorporate changes to the design basis for the MAGNASTOR[supreg] storage system to correct an error with M5 fuel cladding material yield strength that was introduced in CoC No. 1031, Amendment No. 14 and the associated revisions to Amendment Nos. 0 through 13.
Key facts
- Document number
- 2026-13260
- Type
- Final rule
- Action
- Direct final rule
- Agency
- Nuclear Regulatory Commission
- Published
- July 1, 2026
- Takes effect
- September 14, 2026
- Comments due
- July 31, 2026
- Dates
- This direct final rule is effective September 14, 2026, unless significant adverse comments are received by July 31, 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 If this direct final rule is withdrawn as a result of such comments, timely notice of the withdrawal will be published in the Federal Register.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 t
- Docket
- NRC-2026-2047
- Regulation ID (RIN)
- 3150-AL68
- Code of Federal Regulations
- 10 CFR 72
- Topics
- Administrative practice and procedure; Hazardous waste; Indians; Intergovernmental relations; Nuclear energy; Penalties; Radiation protection; Reporting and recordkeeping requirements; Security measures; Whistleblowing
- Pages
- 8
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