Spotlight
TerraPower, LLC -- Kemmerer Power Station Unit 1 Application
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Project Overview
The staff of the U.S. Nuclear Regulatory Commission (NRC) is currently engaged in review activities for the construction permit application from TerraPower, LLC (TerraPower), on behalf of US SFR Owner, LLC (USO), a wholly owned subsidiary of TerraPower, for Kemmerer Power Station Unit 1 (Kemmerer Unit 1) to be located in Lincoln County, Wyoming. The Kemmerer Unit 1 project is supported by the U.S. Department of Energy’s Advanced Reactor Demonstration program and would be used to demonstrate the TerraPower and General Electric-Hitachi Natrium sodium fast reactor technology.
Plant Characteristics | Description |
|---|---|
Reactor Type | Pool-type sodium fast reactor |
Containment Type | Functional containment (see SECY-18-0096 for a description of functional containment) |
Power Level | 840 megawatts thermal |
Fuel | Metallic uranium-zirconium (U-10Zr) HALEU fuel column with a sodium bond to HT9 cladding |
Balance of Plant | The balance-of-plant (BOP) systems proposed for Kemmerer Unit 1 are like those used in the current fleet of light-water reactors (LWRs), with the exception of the molten salt tanks which can be used as an energy storage feature. The Kemmerer Unit 1 design includes a condensate and feed system, a steam generating system, heat rejection system, circulation water, mechanical draft cooling tower, and a steam turbine. As noted above, the primary difference between a traditional LWR BOP and the Kemmerer Unit 1 BOP is that heat for steam and electric power generation is provided by the molten salt storage tank system and is largely independent of the reactor. |
Key Milestones
Milestones | Completion Date |
|---|---|
Application Tendered | 03/28/2024 |
Acceptance Review | |
Acceptance Review Start | 04/10/2024 – A |
Docketing Decision Letter | 05/21/2024 – A |
Review Schedule Established/Schedule Letter Issued to Applicant | 06/12/2024 – A |
Safety Review | |
Draft Safety Evaluation — Safety Evaluation sections drafted, and information gaps identified | 02/2025 – A |
Advanced Safety Evaluation — Begin NRC management, legal, and Advisory Committee on Reactor Safeguards review of SE sections. | 08/2025 – A |
Final Safety Evaluation — Final Safety Evaluation updated and issued. | 12/2025 – T |
Environmental Review | |
Environmental Scoping — Scoping activities completed, and Scoping Summary Report issued. | 11/2024 - A |
Complete DEIS Sections — Initial drafts of Draft EIS sections completed; Audit Plan and Info Needs issued and Draft EIS sections updated. Early legal review of DEIS sections completed. Appendices completed and consolidated Draft EIS prepared. | 03/2025 - A |
Finalize DEIS and Related Activities — Extended audit completed; post audit applicant submittals complete. NRC management and final legal review of the consolidated DEIS and associated correspondence completed. Publication and issuance activities completed. | 06/2025 - A |
Comment Responses and FEIS — Comment period on the DEIS; staff responses to public comments completed and the Final Environmental Impact Statement (FEIS) prepared. | 10/2025 - T |
Finalize FEIS and Related Activities — NRC management and attorney review of FEIS and associated correspondence completed. Publication and issuance activities completed. | 12/2025 - T |
Hearing | TBD |
Construction Permit Decision | TBD |
* The review team will begin interacting with the ACRS subcommittee as soon as portions of the safety evaluation can be made available to the public. When the advanced safety evaluation is approved by NRC staff managers, it is promptly provided to the ACRS for subcommittee and full committee review and ACRS may write a letter to the staff commenting on the evaluation.
Public Involvement
Date | Description |
|---|---|
Scoping Meeting To Discuss The Draft Environmental Impact Statement For The potential construction for Kemmerer Unit One |
Contacts
Contacts for Kemmerer Power Station Unit 1 | |
|---|---|
Safety Project Managers | Mallecia Sutton |
Environmental Project Managers | Patricia Vokoun |
Public Affairs Officer | Scott Burnell |
Page Last Reviewed/Updated Monday, September 29, 2025
Page Last Reviewed/Updated Monday, September 29, 2025