# 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

**Action Urgency Score:** 30/100

| Field | Value |
|---|---|
| Agency | Nuclear Regulatory Commission |
| Type | Final rule |
| Action | Direct final rule; confirmation of effective date. |
| Published | 2026-08-12 |
| Effective | 2026-09-14 |
| Significant | No |
| CFR parts | 10 CFR 72 |
| Summary | 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. |
| Document number | 2026-16398 |

## Why this score
- Final rule.

Source: Federal Register API (Office of the Federal Register) (https://www.federalregister.gov/documents/2026/08/12/2026-16398/list-of-approved-spent-fuel-storage-casks-nac-international-inc-magnastor-storage-system-certificate). Last refreshed: 2026-11-04T09:17:43.641Z.
Data from the Federal Register API; the published Federal Register document is authoritative. Informational only, not legal advice.