Kemmerer Power Station Unit 1 (Natrium) construction permit

Kemmerer Power Station Unit 1 (Natrium) construction permit: NRC construction permit review for US SFR Owner, LLC (wholly owned subsidiary of TerraPower, LLC) — issued, 21.6 months from docketing to decision. Sourced dates and schedule.

Background: NRC reactor licensing process, explained · The ADVANCE Act, explained: what changed and where the NRC stands

Current state

Review time is measured in average months from the date the NRC docketed the application to the decision. The NRC's own reported durations may measure to the final safety evaluation instead.

Notes

Docketed before the ADVANCE Act (2024-07-09), decided after; review accelerated in 2025 citing Executive Order 14300. NRC measures the 18 executed months to the FSE (docketing 2024-05-21 to FSE 2025-12-01). No operating license application found as of 2026-10-16. Final safety evaluation: ML25329A252. Efficiency page: 'The review was completed in 18 months – 9 months ahead of schedule and 11 percent under budget.'

Timeline

• 2024-03-28 — Application received: “The application for the construction permit was received on March 28, 2024, and a supplement to the application was submitted on May 2, 2024.” (source)
• 2024-05-21 — Accepted for review (docketed): “The application was docketed on May 21, 2024.” (source)
• 2025-12-01 — Final safety evaluation issued. (source)
• 2026-03-04 — Commission mandatory hearing. (source)
• 2026-03-09 — Issued: “The Construction Permit No. CPAR-1 was issued on March 9, 2026.” (source)

The timeline is append-only: corrections are added as new entries. See the NNN Data License Terms for reuse of the event history.

Also tracked

• natrium-kemmerer-1 in the Reactor Project Tracker

NNN coverage

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Sources

1. https://www.nrc.gov/facilities-safety/new-reactors/advanced-reactors/who-were-working-with/past-licensing-activities/kemmerer-power-station-unit-1
2. https://www.nrc.gov/facilities-safety/new-reactors/advanced-reactors/who-were-working-with/past-licensing-activities/kemmerer-power-station-unit-1/application-documents
3. https://www.federalregister.gov/d/2024-10474
4. https://www.federalregister.gov/d/2024-12154
5. https://www.nrc.gov/docs/ML2518/ML25181A764.pdf
6. https://www.nrc.gov/docs/ML2532/ML25329A252.pdf
7. https://www.federalregister.gov/d/2025-23678
8. https://www.federalregister.gov/d/2026-05067
9. https://www.nrc.gov/regulations-legislation/effectiveness-efficiency-and-timeliness-initiatives-that-support-unleashing-american-energy/licensing-efficiencies