ML22060A272

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

ML22060A272
Person / Time
Site:	Hermes File:Kairos Power icon.png
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 3 1, 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)

PreliminarySafetyAnalysisReport AccidentAnalysis

Table13.21:SiteSpecific/QValues

(s/m3)

Distance(m) 02hrs 28hrs 8hrs-1day 1-4days 4-30days

250 1.51x104 N/A N/A N/A N/A

800 3.61x105 3.51x105 1.44x1051.53x1051.44x105 1.45x105 1.54x105 1.49x105

KairosPowerHermesReactor 1324 Revision0 PreliminarySafetyAnalysisReport AccidentAnalysis

Table13.22:MaximumHypotheticalAccidentDoseConsequences

WholeBodyDose(rem) ThyroidDose(rem)

LocationandDuration 10CFR100 MHA 10CFR100 MHA Limit Result Limit Result

ExclusionAreaBoundary (First2hrsat250m) 25 0.2010.227 300 0.1610.235

LowPopulationZone (30daysat800m) 25 0.0560.059 300 0.0830.081

KairosPowerHermesReactor 1325 Revision0 Enclosure 2

Change Pages for ER (Non-Proprietary)

EnvironmentalReport Chapter4-Impacts

Table4.111:DoseConsequencefromtheMHA LocationandDuration WholeBodyDose(rem) ThyroidDose(rem) 10CFR100Limit MHAResult 10CFR100Limit MHAResult ExclusionAreaBoundary (First2hoursat250m) 25 0.2010.227 300 0.1610.235 LowPopulationZone (30daysat800m) 25 0.0560.059 300 0.0830.081

KairosPowerHermesReactor 4111 Revision0