ML25055A019

Terrapower, LLC, Kemmerer Power Station, Unit 1, Construction Permit Application Review Status (Epids: L-2024-CPS-0000 and L-2024-LNE-0002)

ML25055A019
Person / Time
Site:	Kemmerer File:TerraPower icon.png
Issue date:	02/26/2025
From:	Mallecia Sutton Office of Nuclear Reactor Regulation
To:	George Wilson TerraPower
References
EPID L-2024-LNE-0002, EPID L-2024-CPS-0000
Download: ML25055A019 (3)

Text

February 26, 2025 Mr. George Wilson Vice President, Regulatory Affairs TerraPower, LLC 15800 Northup Way Bellevue, WA 98008

SUBJECT:

US SFR OWNER, LLC - KEMMERER POWER STATION UNIT 1 CONSTRUCTION PERMIT APPLICATION REVIEW STATUS (EPIDS: L-2024-CPS-0000 AND L-2024-LNE-0002)

Dear Mr. Wilson:

The purpose of this letter is to inform US SFR Owner, LLC (USO), a wholly owned subsidiary of TerraPower, LLC (TerraPower), that the U.S. Nuclear Regulatory Commission (NRC) staff has completed its draft safety evaluation (SE) with open items for the Kemmerer Power Station Unit 1 (Kemmerer 1) construction permit (CP) application. Productive interactions between USO and the NRC staff facilitated completion of this milestone ahead of the scheduled March 2025 date.

With continued focus by both parties, the NRC staff is targeting completion of the final SE by June 2026, ahead of the August 2026 date communicated in our June 12, 2024, schedule letter (Agencywide Documents Access and Management System (ADAMS) Accession No. ML24162A063). The environmental review is scheduled for completion in May 2026; and the overall resource estimate remains on track, as described in the staffs November 25, 2024, letter (ML24304A977).

The NRC staff have identified additional information needs to support completion of its safety review. These include materials qualification for environmental compatibility, appropriate special treatment for design and construction of safety-significant structures, systems and components; treatment of preventative functions and features within the probabilistic risk assessment (PRA);

documentation supporting the PRAs use in the Licensing Modernization Project and other licensing programs; and the safety basis for non-safety-related with special treatment seismic/structural design approaches. The NRC staff is relying on USOs continued commitment to address these information needs to support the NRC staffs ability to make the necessary regulatory findings on the revised schedule. The schedule may be adjusted, if necessary, to accommodate any delays in the NRC staffs receipt of necessary information. The NRC staff intends to continue engagement with USO to resolve open items and address any emerging technical and regulatory issues.

If you have any questions regarding this matter, please contact me at (301) 415-0673 or via email at Mallecia.Sutton@nrc.gov.

Sincerely, R/A Mallecia Sutton, Senior Project Manager Advanced Reactor Licensing Branch 1 Division of Advanced Reactors and Non-Power Production and Utilization Facilities Office of Nuclear Reactor Regulation Docket No.: 50-0613 cc: TerraPower Natrium via Gov Delivery

ML25055A019 NRR-106 OFFICE NRR/DANU/UAL1:PM NRR/DANU/UAL1:LA NRR/DANU/UAL1:BC NAME MSutton DGreene JBorromeo DATE 2/21/22 2/24/2025 2/ 25 /2025 OFFICE NRR/DANU/UTB2:BC NRR/DANU/D NRR/DANU/UAL1:PM NAME CDeMessieres JBowen MSutton DATE 2/25/2025 2/25/2025 2/26/2025