ML22060A272

Kairos Power, LLC, Transmittal of Changes to Maximum Hypothetical Accident Dose Results in Hermes Construction Permit Application

ML22060A272
Person / Time
Site:	Hermes
Issue date:	03/01/2022
From:	Hastings P Kairos Power
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
KP-NRC-2203-001
Download: ML22060A272 (7)

Text

KP-NRC-2203-001 March 1, 2022 Docket No. 50-7513 US Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001

Subject:

Kairos Power LLC Transmittal of Changes to Maximum Hypothetical Accident Dose Results in Hermes Construction Permit Application

References:

1. Letter, Kairos Power LLC to Document Control Desk, Submittal of the Preliminary Safety Analysis Report for the Kairos Power Fluoride Salt-Cooled, High Temperature Non-Power Reactor (Hermes), September 29, 2021 (ML21272A376)

2. Letter, Kairos Power LLC to Document Control Desk, Submittal of the Environmental Report for the Kairos Power Fluoride Salt-Cooled, High Temperature Non-Power Reactor (Hermes), October 31, 2021 (ML21306A131)

In September and October 2021, Kairos Power submitted a Construction Permit Application (CPA) for the Hermes non-power reactor, including a Preliminary Safety Analysis Report (PSAR) (Reference 1) and an Environmental Report (ER) (Reference 2). Subsequent to the initial submittal of these documents, minor errors in the Maximum Hypothetical Accident calculation were identified and corrected via the Kairos Power corrective action program. These changes have a negligible impact on the conclusions in the CPA but has a minor effect on content in Chapter 13 of the PSAR and Chapter 4 of the ER. The changes to PSAR and ER content are reflected in the enclosures to this letter. Kairos Power requests NRC review of these changes as part of continued review of the Hermes CPA.

Changes to the pages of the PSAR affected by this decision are provided in Enclosure 1. Changes to the pages of the ER affected by this decision are provided in Enclosure 2.

If you have any questions or need any additional information, please contact Drew Peebles at peebles@kairospower.com or at (704) 275-5388 or Darrell Gardner at gardner@kairospower.com or (704) 769-1226.

I declare under penalty of perjury that the foregoing is true and correct.

Executed on March 1, 2022.

Peter Hastings, PE Vice President, Regulatory Affairs and Quality Kairos Power LLC www.kairospower.com 707 W Tower Ave, Suite A 5201 Hawking Dr SE, Unit A 2115 Rexford Rd, Suite 325 Alameda, CA 94501 Albuquerque, NM 87106 Charlotte, NC 28211

KP-NRC-2203-001 Page 2

Enclosures:

1) Change Pages for PSAR

2) Change Pages for ER xc (w/enclosure):

William Kennedy, Acting Chief, NRR Advanced Reactor Licensing Branch Benjamin Beasley, Project Manager, NRR Advanced Reactor and Licensing Branch Edward Helvenston, Project Manager, NRR Advanced Reactor Licensing Branch Samuel de Jesus Cuadrado, Project Manager, NRR Advanced Reactor Licensing Branch Tamsen Dozier, Environmental Project Manager, NMSS, Environmental Review Branch Peyton Doub, Environmental Project Manager, NMSS, Environmental Review Branch

Enclosure 1 Change Pages for PSAR (Non-Proprietary)

Preliminary Safety Analysis Report Accident Analysis Table 13.21: SiteSpecific /Q Values (s/m3)

Distance (m) 02 hrs 28 hrs 8 hrs - 1 day 1 - 4 days 4 - 30 days 250 1.51x104 N/A N/A N/A N/A 800 3.61x105 3.51 x105 1.44 x105 1.53 x105 1.44 x105 1.45 x105 1.54 x105 1.49 x105 Kairos Power Hermes Reactor 1324 Revision 0

Preliminary Safety Analysis Report Accident Analysis Table 13.22: Maximum Hypothetical Accident Dose Consequences Whole Body Dose (rem) Thyroid Dose (rem)

Location and Duration 10 CFR 100 MHA 10 CFR 100 MHA Limit Result Limit Result Exclusion Area Boundary 0.201 0.161 (First 2 hrs at 250m) 25 300 0.227 0.235 Low Population Zone 0.056 0.083 (30 days at 800m) 25 300 0.059 0.081 Kairos Power Hermes Reactor 1325 Revision 0

Enclosure 2 Change Pages for ER (Non-Proprietary)

Environmental Report Chapter 4 - Impacts Table 4.111: Dose Consequence from the MHA Whole Body Dose (rem) Thyroid Dose (rem)

Location and Duration 10 CFR 100 Limit MHA Result 10 CFR 100 Limit MHA Result Exclusion Area Boundary 0.201 0.161 25 300 (First 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> at 250m) 0.227 0.235 Low Population Zone 0.056 0.083 25 300 (30 days at 800m) 0.059 0.081 Kairos Power Hermes Reactor 4111 Revision 0