ML20034F066
| ML20034F066 | |
| Person / Time | |
|---|---|
| Issue date: | 02/07/2020 |
| From: | Stewart Magruder NRC/NRR/DANU/UARL |
| To: | Benjamin Beasley NRC/NRR/DANU/UARL |
| Stewart Magruder, NRR/DANU, 301-348-5766 | |
| References | |
| KP-TR-006 | |
| Download: ML20034F066 (4) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 February 7, 2020 MEMORANDUM TO:
Benjamin G. Beasley, Chief Advanced Reactor Licensing Branch Division of Advanced Reactors and Non-Power /RA/
Production and Utilization Facilities Office of Nuclear Reactor Regulation FROM:
Stewart L. Magruder, Senior Project Manager Advanced Reactor Licensing Branch Division of Advanced Reactors and Non-Power Production and Utilization Facilities Office of Nuclear Reactor Regulation
SUBJECT:
REPORT FOR THE REGULATORY AUDIT OF KAIROS POWER LLC TOPICAL REPORT KP-TR-006, SCALING METHODOLOGY FOR THE KAIROS POWER TESTING PROGRAM Kairos Power LLC (Kairos) began pre-application discussions with the NRC staff on their Kairos Power Fluoride-Salt-Cooled, High-Temperature Reactor (KP-FHR) in October 2018. Since then, Kairos has submitted several topical and technical reports and has met with the NRC staff on numerous occasions. This audit allowed the NRC staff to review documents supporting the review of the subject topical report.
The audit was conducted between the months of December 2019 and January 2020, at U.S.
Nuclear Regulatory Commission (NRC) Headquarters via Kairos Power, LLC electronic reading room.
Enclosure:
Audit Report CONTACT: Stewart Magruder, NRR/DANU/UARL 301-348-5766
- via email OFFICE NRR/DANU/UARL NRR/DANU/UARL NRR/DANU/UART NAME SMagruder BBeasley MHayes DATE 02/3/20 02/07/2020 02/07/2020 ENCLOSURE KAIROS POWER, LLC
SUMMARY
REPORT FOR THE REGULATORY AUDIT OF KAIROS POWER LLC TOPICAL REPORT KP-TR-006, SCALING METHODOLOGY FOR THE KAIROS POWER TESTING PROGRAM, REVISION 0 and REVISION 1 December 2019 - January 2020
1.0 BACKGROUND
AND PURPOSE By letter dated March 6, 2019 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML19066A047), Kairos Power, LLC (Kairos), requested U.S. Nuclear Regulatory Commission (NRC) review and approval of Topical Report (TR) KP-TR-006, Scaling Methodology for the Kairos Power Testing Program and Revision 1 of the TR by letter dated January 16, 2020 (ADAMS Accession No. ML20016A486). This TR describes the Kairos methodology to perform scaling analyses with surrogate fluids for Flibe (2LiF:BeF2) as part of the Evaluation Model Development and Assessment Process described in Regulatory Guide 1.203, Transient and Accident Analysis Methods, (ADAMS Accession No. ML053500170).
Additionally, the technical content of the TR was discussed in a public meeting on November 15, 2019 (ADAMS Accession No. ML19308A077 and ADAMS Accession No. ML19290E570).
During this meeting, several items for follow-up clarification were identified. This audit allowed the NRC staff to address those follow-up clarification items identified in the public meeting of November 15, 2019.
2.0 AUDIT REGULATORY BASES This regulatory audit is based on KP-TR-006, Scaling Methodology for the Kairos Power Testing Program, (ADAMS Accession No. ML19066A047) and Revision 1 of the TR (ADAMS Accession No. ML20016A486).
3.0 AUDIT OBJECTIVES The audit team reviewed supporting calculations and met with subject matter expert(s) to discuss details of the calculations supporting KP-TR-006.
4.0 SCOPE OF THE AUDIT AND AUDIT ACTIVITIES The audit was conducted during the months of December 2019 and January 2020, at U.S.
Nuclear Regulatory Commission (NRC) Headquarters via the Kairos electronic reading room (ERR). The NRC staff conducted the audit in accordance with the Office of Nuclear Reactor Regulation (NRR) Office Instruction NRR-LIC-111, Revision 1 Regulatory Audits.
Members of the audit team, listed below, were selected based on their detailed knowledge of the subject. Audit team members included:
- 1. Antonio Barrett, NRR (Technical Reviewer)
- 2. Timothy Drzewiecki, NRR (Technical Reviewer)
- 3. Steve Bajorek, RES (Technical Reviewer)
- 4. Stu Magruder, NRR (Senior Project Manager)
- 5. Luissette Candelario, NRR (Project Manager)
The NRC staff reviewed the following documents:
KP-CALC-000007, Revision 0, Scaling Calculation Example for Kairos Power Integral Effects Tests, 12/18/2019.
List of Heat Transfer References 5.0
SUMMARY
OF OBSERVATIONS The NRC staffs summary of observations listed below is based on the notes taken by the staff during the audit. The NRC staff did not acquire any documents during the audit. The NRC staff examined engineering calculation KP-CALC-000007, Revision 0, Scaling Calculation Example for Kairos Power Integral Effects Tests. During this examination NRC staff noted the purpose of the document, identified key inputs and their sources, and noted the key results. In particular, NRC staff noted:
The purpose of the document is to provide an illustration of the scaling methodology applied to integral effects tests.
The document repeats the principal equations used in the scaling methodology report (KP-TR-006).
The inputs provided in the document are the same as provided in the scaling methodology report (KP-TR-006).
The thermophysical properties provided in the document are the same as provided in the scaling methodology report (KP-TR-006).
The results provided in the document tables match the values provided in the scaling methodology report (KP-TR-006).
The NRC staff examined the document List of Heat Transfer References and noted that it provided twisted tube heat exchanger heat transfer and friction factor references and packed bed heat transfer references.
6.0 EXIT BRIEFING The NRC staff conducted an audit closeout meeting on January 31, 2020. At the exit briefing the NRC staff reiterated the purpose of the audit and discussed their activities. Additionally, the NRC staff stated that they did not identify areas where additional information would be necessary to support the review.
7.0 EXIT REQUESTS FOR ADDITIONAL INFORMATION RESULTING FROM AUDIT No RAIs were generated as a result of this audit.
8.0 OPEN ITEMS AND PROPOSED CLOSURE PATHS Not applicable. There were no deviations from the audit plan.