ML21194A439

Draft Kairos Flibe Thermophisical Properties Audit Plan 6 30 21

ML21194A439
Person / Time
Site:	99902069
Issue date:	08/20/2021
From:	Cuadrado S, William Kennedy NRC/NRR/DANU/UARL
To:	Kairos Power
Cuadrado S
References
CAC 000431, EPID L-2021-LRM-0085
Download: ML21194A439 (4)

Text

KAIROS POWER, LLC - FLIBE THERMOPHYSICAL PROPERTIES AUDIT PLAN (CAC/EPID NO. 000431/99902069/L-2021-LRM-0085)

APPLICANT INFORMATION Applicant:

Kairos Power LLC Applicant Address:

707 W. Tower Ave, Alameda, CA 94501 Plant Name(s) and Unit(s):

Kairos - Hermes Test Reactor Project No(s).:

99902069

Background:

Kairos Power LLC (Kairos) began pre-application discussions with the U.S. Nuclear Regulatory Commission (NRC) staff on their Kairos Power Fluoride-Salt-Cooled, High-Temperature Reactor (KP-FHR) in October 2018. In December of 2020, Kairos announced that the Hermes test reactor would be used to support future development of the KP-FHR. Over the past several years, Kairos has submitted several topical and technical reports that apply to both the Hermes test reactor, as well as the full-scale KP-FHR reactor. As discussed in meetings held on January 27 and March 3, 2021, Kairos plans to submit an application for a construction permit (CP), including a preliminary safety analysis report (PSAR), for the Hermes test reactor in accordance with Title 10 of the Code of Federal Regulations (10 CFR) Part 50, Domestic licensing of production and utilization facilities. A key reference in the preliminary safety evaluation will be the Reactor Coolant topical report which provides key thermophysical properties for use in safety analyses. This topical report was reviewed and approved by the NRC staff subject to Limitations and Conditions. One such condition is for Kairos to perform confirmation analyses to ensure referenced data from the Oak Ridge National Laboratory (ORNL) Molten Salt Reactor Experiment (MSRE) is quality data and applicable to Kairos reactor designs. As per the Kairos presentation to the NRC staff dated January 27, 2021, it is expected that Kairos will reference this topical report in the PSAR for the Hermes test reactor. A copy of the January 27, 2021, presentation is available electronically in the NRC's document system (Agencywide Documents Access and Management System (ADAMS)), under Accession No. ML21021A364.

Purpose:

The purpose of this audit is for the NRC staff to gain a better understanding of Kaiross process to determine that referenced historical data is appropriate to use in safety analyses for the Hermes and KP-FHR reactor designs. Therefore, the staff is requesting access to internal documents associated with confirmation of thermophysical property data and correlations and their associated uncertainties as part of the Reactor Coolant topical report. In addition, the staff

2 is requesting any documents referenced in the evaluation of the thermophysical property data that are not already available to the NRC staff. The NRC staff will summarize its observations in an audit report to be provided to Kairos, as discussed below.

Regulatory Audit Basis:

The bases for the audit are the regulations in 10 CFR Part 50, Sections 50.34(a), Preliminary Safety Analysis Report, and 50.35, Issuance of construction permits.

Regulatory Audit Scope This audit will focus on information provided by Kairos on the online reference portal.

Information and Other Material Necessary for the Regulatory Audit Documents associated with confirmation of thermophysical property data and correlations that will be used to satisfy Limitations and Conditions from the NRC staff safety evaluation for the Kairos Power Reactor Coolant topical report. The staff request that the following documents be available on Kairos online reference portal for the audit:

Review of Flibe Thermophysical Property Legacy Data: Density, Revision 0

Review of Flibe Thermophysical Property Legacy Data: Thermal Conductivity, Revision 0

Review of Flibe Thermophysical Property Legacy Data: Heat Capacity, Revision 0

Review of Flibe Thermophysical Property Legacy Data: Viscosity, Revision 0 Team Assignments Alexander Chereskin Materials Engineer, Audit Lead responsible for audit summary report preparation Jeffrey Schmidt Sr. Reactor Systems Engineer Boyce Travis Reactor Systems Engineer Zee St. Hilaire Student Intern Nicholas Savwoir Reactor Operations Engineer (Quality Assurance)

Samuel Cuadrado Project Manager responsible for audit logistics Richard Rivera Project Manager Stewart Magruder Sr. Project Manager Additional audit team members may be added as needed.

Logistics Entrance Meeting August 16, 2021 Exit Meeting September 30, 2021 Audit meetings take place in a virtual format, using Microsoft Teams, or via other, similar platform. Audit meetings will be scheduled on an as needed basis after the entrance meeting and once the NRC staff has had the opportunity to review any documents placed in the online reference portal. The audit duration is anticipated to be approximately 7 weeks with activities occurring intermittently during that period. The NRC staff estimates that the level of effort for the audit is approximately 115 hours0.00133 days <br />0.0319 hours <br />1.901455e-4 weeks <br />4.37575e-5 months <br />.

3 Special Requests The NRC staff requests that Kairos Power ensure that their technical staff are available to answer questions during the audit. The NRC staff also requests that Kairos Power provide access to supporting documents via the Kairos online reference portal.

Deliverables At the completion of the audit, the audit team will issue an audit summary within 90 days after the exit meeting. The audit summary will be declared and entered as an official agency record in NRCs ADAMS and be made available for public viewing through the publicly available records component of ADAMS.

References Title 10 of the Code of Federal Regulations.

Please contact Samuel Cuadrado de Jesus (NRC) at 301-415-2946 or by email at samuel.cuadradodejesus@nrc.gov about any issues related to the conduct of the audit.

Date: August 20, 2021 Samuel Cuadrado, Project Manager for William B. Kennedy, Acting Chief Advanced Reactors Licensing Branch Division of Advanced Reactors and Non-Power Production and Utilization Facilities Office of Nuclear Reactor Regulation Cuadrado de Jesus, Samuel signing on behalf of Kennedy, William on 08/19/21

ML21194A439 OFFICE NRR/DANU/UART/LEAD NRR/DANU/UARL/PM NRR/DANU/UARL/LA NAME AChereskin SCuadrado SLent DATE 08/10/2021 08/10/2021 08/11/2021 OFFICE NRR/DANU/UART/BC NRR/DANU/UARL/BC NRR/DANU/UARL/PM NAME MOrenak WKennedy SCuadrado DATE 08/17/2021 08/17/2021 08/20 /2021