ML25274A124
| ML25274A124 | |
| Person / Time | |
|---|---|
| Site: | Kemmerer File:TerraPower icon.png |
| Issue date: | 10/01/2025 |
| From: | George Wilson TerraPower |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| Shared Package | |
| ML25274A123 | List: |
| References | |
| TP-LIC-LET-0459 | |
| Download: ML25274A124 (1) | |
Text
15800 Northup Way, Bellevue, WA 98008 www.TerraPower.com P. +1 (425) 324-2888 F. +1 (425) 324-2889 TP-LIC-LET-0459 Docket Number 50-613 October 1, 2025 U.S. Nuclear Regulatory Commission Washington, DC 20555-0001 ATTN: Document Control Desk
Subject:
Research and Development Supplemental Information
Reference:
- 1. TerraPower, LLC, Submittal of the Construction Permit Application for the Natrium Reactor Plant, Kemmerer Power Station Unit 1, March 28, 2024 (ML24088A059).
Pursuant to Title 10 of the Code of Federal Regulations, Part 50 (10 CFR 50), Domestic Licensing of Production and Utilization Facilities, TerraPower, LLC (TerraPower) submitted, on behalf of US SFR Owner, LLC (USO), a wholly owned subsidiary of TerraPower, a construction permit application (CPA) to construct a Natrium Reactor Plant1, Kemmerer Power Station Unit 1 (Reference 1). The Preliminary Safety Analysis Report (PSAR), which is Enclosure 2 of the CPA, provides information related to research and development activities pursuant to 10 CFR 50.34(a)(8). to this letter provides supplemental information pertaining to the research and development activities described in the PSAR related to Reactor Air Cooling System heat transfer performance and Intermediate Heat Transport System sodium-salt heat exchanger interaction. This enclosure contains proprietary information and as such, it is requested that be withheld from public disclosure in accordance with 10 CFR 2.390, Public inspections, exemptions, requests for withholding. An affidavit certifying the basis for the request to withhold Enclosure 2 from public disclosure is included as Enclosure 1. Enclosure 2 also contains ECI which can be disclosed to Foreign Nationals only in accordance with the requirements of 15 CFR 730 and 10 CFR 810, as applicable. Proprietary and ECI materials have been redacted from the report provided in Enclosure 2; redacted information is identified using (( ))(a)(4), (( ))ECI, or (( ))(a)(4), ECI.
1 a TerraPower & GE Vernova Hitachi Nuclear Energy Technology
October 1, 2025 Page 2 of 2 provides the public version of Enclosure 2.
This letter makes no new or revised regulatory commitments.
If you have any questions regarding this submittal, please contact Ian Gifford at igifford@terrapower.com.
I declare under penalty of perjury that the foregoing is true and accurate.
Executed on October 1, 2025 Sincerely, George Wilson Senior Vice President, Regulatory Affairs TerraPower, LLC
Enclosures:
- 1.
TerraPower, LLC Affidavit and Request for Withholding from Public Disclosure (10 CFR 2.390(a)(4)) - Public 2.
TerraPower Supplemental R&D Information (Non-Public) 3.
TerraPower Supplemental R&D Information (Public) cc:
Mallecia Sutton, NRC Josh Borromeo, NRC Nathan Howard, DOE
ENCLOSURE 1 TerraPower, LLC Affidavit and Request for Withholding from Public Disclosure (10 CFR 2.390(a)(4))
TerraPower, LLC Affidavit and Request for Withholding from Public Disclosure (10 CFR 2.390(a)(4))
I, George Wilson, hereby state:
- 1. I am the Senior Vice President, Regulatory Affairs and I have been authorized by TerraPower, LLC (TerraPower) to review information sought to be withheld from public disclosure in connection with the development, testing, licensing, and deployment of the Natrium reactor and its associated fuel, structures, systems, and components, and to apply for its withholding from public disclosure on behalf of TerraPower.
- 2. The information sought to be withheld, in its entirety, is contained in Enclosure 2, which accompanies this Affidavit.
- 3. I am making this request for withholding, and executing this Affidavit as required by 10 CFR 2.390(b)(1).
- 4. I have personal knowledge of the criteria and procedures utilized by TerraPower in designating information as a trade secret, privileged, or as confidential commercial or financial information that would be protected from public disclosure under 10 CFR 2.390(a)(4).
- 5. The information contained in Enclosure 2 accompanying this Affidavit contains non-public details of the TerraPower regulatory and developmental strategies intended to support NRC staff review.
- 6. Pursuant to 10 CFR 2.390(b)(4), the following is furnished for consideration by the Commission in determining whether the information in Enclosure 2 should be withheld:
- a. The information has been held in confidence by TerraPower.
- b. The information is of a type customarily held in confidence by TerraPower and not customarily disclosed to the public. TerraPower has a rational basis for determining the types of information that it customarily holds in confidence and, in that connection, utilizes a system to determine when and whether to hold certain types of information in confidence.
The application and substance of that system constitute TerraPower policy and provide the rational basis required.
- c. The information is being transmitted to the Commission in confidence and, under the provisions of 10 CFR 2.390, it is received in confidence by the Commission.
- d. This information is not available in public sources.
- e. TerraPower asserts that public disclosure of this non-public information is likely to cause substantial harm to the competitive position of TerraPower, because it would enhance the ability of competitors to provide similar products and services by reducing their expenditure of resources using similar project methods, equipment, testing approach, contractors, or licensing approaches.
I declare under penalty of perjury that the foregoing is true and correct.
Executed on: October 1, 2025 George Wilson Senior Vice President, Regulatory Affairs TerraPower, LLC