# 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. |
| Published | 2026-07-01 |
| Effective | 2026-09-14 |
| Comments close | 2026-07-31 |
| Significant | No |
| CFR parts | 10 CFR 72 |
| Summary | 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 |
| Document number | 2026-13260 |

## Why this score
- Final rule.

Source: Federal Register API (Office of the Federal Register) (https://www.federalregister.gov/documents/2026/07/01/2026-13260/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.