ML25317A472
| ML25317A472 | |
| Person / Time | |
|---|---|
| Site: | 99902069 |
| Issue date: | 01/05/2026 |
| From: | Joshua Borromeo NRC/NRR/DANU/UAL1 |
| To: | Gardner D Kairos Power |
| References | |
| EPID L-2024-TOP-0022 KP-TR-020-P | |
| Download: ML25317A472 (0) | |
Text
January 5, 2025 Darrell Gardner Sr. Director, Licensing Kairos Power LLC 707 W Tower Ave Alameda, CA 94501
SUBJECT:
KAIROS POWER LLC - FINAL SAFETY EVALUATION OF TOPICAL REPORT, SAFETY ANALYSIS METHODOLOGY FOR THE KAIROS POWER FLUORIDE SALT-COOLED HIGH-TEMPERATURE TEST REACTOR, REVISION 1 (EPID NO: L-2024-TOP-0022)
Dear Darrell Gardner:
This letter provides the final safety evaluation (SE) for the Kairos Power, LLC (Kairos) topical report (TR) Safety Analysis Methodology for the Kairos Power Fluoride Salt-Cooled High-Temperature Test Reactor, Revision 1. By letter dated June 4, 2024, Kairos submitted for U.S.
Nuclear Regulatory Commission (NRC) staff review KP-TR-020-P, Safety Analysis Methodology for the Kairos Power Fluoride Salt-Cooled High-Temperature Test Reactor, Revision 0 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML24156A162). On September 25, 2024, the NRC issued an audit plan for the purpose of gaining a better understanding of KP-TR-020-P (ML24269A202). By letter dated July 29, 2025, Kairos submitted Revision 1 of KP-TR-020-P (ML25210A576). The NRC staff issued the audit summary report in letter dated January 5, 2026 (ML25344A109).
The NRC staffs final SE for KP-TR-020-P, Safety Analysis Methodology for the Kairos Power Fluoride Salt-Cooled High-Temperature Test Reactor, Revision 1 is enclosed. The NRC staff provided Kairos a draft of the SE for the purpose of identifying proprietary export controlled information on September 11, 2025 (ML25258A013). Kairos provided comments regarding the proprietary export controlled information in the draft SE on October 20, 2025 (ML25317A661). The NRC staff incorporated those comments, as appropriate, into the final SE.
The NRC staff requests that Kairos publish an accepted version of this TR within 3 months of receipt of this letter. The accepted version shall incorporate this letter and the enclosed SE after the title page. The accepted version shall include an "-A" (designated accepted) following the TR identification number.
The Enclosure to this letter contains Proprietary Export Controlled Information. When separated from the Enclosure this letter is DECONTROLLED
If you have any questions, please contact Brian Bettes via email at Brian.Bettes@nrc.gov.
Sincerely, Josh Borromeo, Chief Advanced Reactor Licensing Branch 1 Division of Advanced Reactors and Non-Power Production and Utilization Facilities Office of Nuclear Reactor Regulation Project No.: 99902069
Enclosure:
Safety Evaluation JOSHUA BORROMEO Digitally signed by JOSHUA BORROMEO Date: 2026.01.05 14:53:46
-05'00'
Pkg: ML25317A335 Letter: ML25317A472 Safety Evaluation (Proprietary): ML25317A469 Safety Evaluation (Non Proprietary): ML25317A475 OFFICE NRR/DANU/UAL1:PM NRR/DANU/UAL1:LA OGC NAME BBettes DGreene Not Reviewed DATE 7/22/2025 7/29/2025 OFFICE NRR/DANU/UTB2:BC NRR/DANU/UAL1:BC NAME CdeMessieres JBorromeo DATE 9/11/2025 1/5/2026