ML23062A734

Transmittal Letter for Final Safety Evaluation of Graphite Material Qualification for the KP-FHR

ML23062A734
Person / Time
Site:	99902069, Hermes  File:Kairos Power icon.png
Issue date:	03/13/2023
From:	Jessup W NRC/NRR/DANU/UAL1
To:	Hastings P Kairos Power
References
EPID L-2021-TOP-0022, CAC 000431
Download: ML23062A734 (1)

Text

OFFICIAL USE ONLY - PROPRIETARY AND EXPORT CONTROLLED INFORMATION March 13, 2023 Mr. Peter Hastings Vice President, Regulatory Affairs and Quality Kairos Power LLC 707 W Tower Ave.

Alameda, CA 94501

SUBJECT:

KAIROS POWER LLC - FINAL SAFETY EVALUATION FOR TOPICAL REPORT GRAPHITE MATERIAL QUALIFICATION FOR THE KAIROS POWER FLUORIDE SALT-COOLED HIGH-TEMPERATURE REACTOR (REVISION 4)

(EPID NO. L-2021-TOP-0022/CAC NO. 000431)

Dear Mr. Hastings:

This letter provides the final safety evaluation (SE) for the Kairos Power LLC (Kairos) topical report (TR) Graphite Material Qualification for the Kairos Power Fluoride Salt-Cooled High-Temperature Reactor, Revision 4. By letter dated July 8, 2021, Kairos submitted Revision 1 of the TR for the U.S. Nuclear Regulatory Commission (NRC) staff review (Agencywide Documents Access and Management System (ADAMS) Accession No. ML21190A218). On November 2, 2021, the NRC staff provided its review questions to Kairos (ML23059A265).

The review questions were discussed during closed meetings held between the NRC staff and Kairos on December 15, 2021, February 10, 2022, February 15, 2022, February 22, 2022, March 1, 2022, March 8, 2022, and March 15, 2022. By letter dated May 11, 2022, Kairos submitted Revision 2 of the TR (ML22132A202) to address the NRC staff review questions.

By letter dated July 13, 2022, Kairos submitted Revision 3 of the TR (ML22194A943) to address questions discussed during a closed meeting held between the NRC staff and Kairos on June 14, 2022. By letter dated September 16, 2022, Kairos submitted Revision 4 of the TR (ML22259A142) to address a question from the NRC staff related to the Kairos Hermes reactor design.

The NRC staffs final SE for Graphite Material Qualification for the Kairos Power Fluoride Salt-Cooled High-Temperature Reactor, Revision 4, is enclosed. The NRC staff provided Kairos a draft of the SE for the purpose of identifying proprietary information on December 7, 2022 (ML22343A285). On December 19, 2022, Kairos confirmed that the proprietary information in the draft SE was appropriately marked (ML23058A226).

Enclosure 1 to this letter contains Proprietary and Export Controlled Information. When separated from Enclosure 1, this letter is DECONTROLLED.

OFFICIAL USE ONLY - PROPRIETARY AND EXPORT CONTROLLED INFORMATION

OFFICIAL USE ONLY - PROPRIETARY AND EXPORT CONTROLLED INFORMATION P. Hastings The Advisory Committee on Reactor Safeguards (ACRS) was briefed on this TR on January 12, 2023, and February 1, 2023. The ACRS provided its recommendations for the publication of this SE in a letter dated February 13, 2023 (ML23038A168). The enclosed SE is final, and a redacted version will be made publicly available.

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 theenclosed SE after the title page. The accepted version shall include an "-A" (designating accepted) following the TR identification number.

If you have any questions, please contact Richard Rivera at Richard.Rivera@nrc.gov.

Sincerely, Signed by Jessup, William on 03/13/23 William Jessup, 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 and Docket No.: 05007513

Enclosures:

1. Proprietary (Non-Public) Safety Evaluation

2. Redacted (Public) Safety Evaluation Cc w/ redacted encl: Distribution via Kairos Power FHR and Kairos Power Hermes OFFICIAL USE ONLY - PROPRIETARY AND EXPORT CONTROLLED INFORMATION

Pkg ML23062A732 Letter: ML23062A734 Safety Evaluation: ML23039A166 Redacted Safety Evaluation: ML23062A733 NRR-106 OFFICE NRR/DANU/UAL1:PM NRR/DANU/UAL1:LA OGC/NLO NAME RRivera DGreene MWright DATE 3/6/2023 3/10/2023 3/10/2023 OFFICE NRR/DANU/UAL1/BC NAME WJessup DATE 3/13/2023