# 2026-16398: Nuclear Cask System Gets Its Sixteenth and Seventeenth Amendments

2026-16398, 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, is a Federal Register rule from Nuclear Regulatory Commission published 2026-08-12, effective 2026-09-14 (as of 2026-10-28).

- Canonical: https://policyrisk.com/federal-register/2026-16398
- As of: 2026-10-28
- Plain-text twin of the page above; the HTML and this file carry the same facts.

## Facts
- Document number: 2026-16398
- Title: 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
- Type: Rule
- Agencies: Nuclear Regulatory Commission
- Citation: 91 FR 51999
- Published: 2026-08-12
- Effective: 2026-09-14
- Comments close: not stated
- Significant: no
- Touches household money: no
- Regulation identifier numbers: 3150-AL68
- Last updated: 2026-10-28

## In one line

Nuclear Cask System Gets Its Sixteenth and Seventeenth Amendments

## Summary

The Nuclear Regulatory Commission is officially approving updates to the NAC MAGNASTOR spent fuel storage system, including Amendments 16 and 17 plus tweaks to earlier versions. This means the system stays safe and up-to-date for storing used nuclear fuel. The changes take effect on September 14, 2026, ensuring smooth operations without extra costs for users.

## Abstract

The U.S. Nuclear Regulatory Commission (NRC) is confirming the effective date of September 14, 2026, for the direct final rule that was published in the Federal Register on July 1, 2026. This direct final rule amended the NAC MAGNASTOR 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 No. 1031.

## Effects PRIA read

No economic effects identified for this document.

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## Sources
- [2026-16398 on federalregister.gov](https://www.federalregister.gov/documents/2026/08/12/2026-16398/list-of-approved-spent-fuel-storage-casks-nac-international-inc-magnastor-storage-system-certificate)
- [2026-16398 as published (PDF)](https://www.govinfo.gov/content/pkg/FR-2026-08-12/pdf/2026-16398.pdf)

## Related
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- [All Federal Register documents](https://policyrisk.com/federal-register)

Source: PRIA, https://policyrisk.com/federal-register/2026-16398 (as of 2026-10-28).