ML22101A152

Regulatory Audit Report Regarding Request to Review Appendix E to Fleet Topical Report DOM-NAF-2

ML22101A152
Person / Time
Site:	Millstone, Surry, North Anna
Issue date:	04/14/2022
From:	Geoffrey Miller Plant Licensing Branch II
To:	Stoddard D Dominion Nuclear
Miller G
References
EPID L-2021-LLT-0000
Download: ML22101A152 (6)

Text

April 14, 2022

Mr. Daniel G. Stoddard Senior Vice President and Chief Nuclear Officer Innsbrook Technical Center 5000 Dominion Blvd.

Glen Allen, VA 23060-6711

SUBJECT:

NORTH ANNA POWER STATION, UNITS 1 AND 2, SURRY POWER STATION, UNITS 1 AND 2, AND MILLSTONE POWER STATION, UNITS 2 AND 3 -

REGULATORY AUDIT REPORT REGARDING REQUEST TO REVIEW APPENDIX E TO FLEET TOPICAL REPORT DOM-NAF-2 (EPID L-2021-LLT-0000)

Dear Mr. Stoddard:

By letter dated February 11, 2021 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML21042B321), as supplemented by letters dated May 13, 2021 (ADAMS Accession No ML21133A285), September 15, 2021 (ADAMS Accession No. ML21259A079), and February 17, 2022 (ADAMS Accession No. ML22052A064),Dominion Energy requested approval of Appendix E of fleet report DOM-NAF-2, Qualification of the Framatome BWU-I CHF Correlation in the Dominion Energy VIPRE-D Computer Code.

On November 30, 2021 (ADAMS Accession No. ML21334A192), the U.S. Nuclear Regulatory Commission (NRC) staff issued an audit plan that conveyed intent to conduct a regulatory audit to support its review of the subject license amendment. On January 26, February 1, and April 1, 2022, NRC staff conducted a regulatory audit in a virtual environment.

The purpose of the audit was to gain understanding, to verify information, and to identify information that will require docketing to support the proposed licensing action. Based on the audit, the NRC staff intends to modify its one of two proposed limitations and conditions associated with its review of the topical report. The enclosure to this letter provides a report of the NRC staffs audit.

D. Stoddard

If you have any questions, please contact me by telephone at (301) 415-2481 or by e-mail at Ed.Miller@nrc.gov.

Sincerely,

/RA/

G. Edward Miller, Project Manager Special Projects and Process Branch Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation

Docket Nos. 50-280, 50-281, 50-338, 50-339, 50-336, and 50-423

Enclosure:

Audit Report

cc: Listserv

REGULATORY AUDIT REPORT

DOMINION ENERGY (DOMINION)

NORTH ANNA POWER STATION

SURRY POWER STAION

MILLSTONE POWER STATION

APPENDIX E TO TOPICAL REPORT

DOM-NAF-2-A

REACTOR CORE THERMAL-HYDRAULICS USING THE VIPRE-D COMPUTER CODE

DOCKET NOS. 50-280, 50-281, 50-338, 50-339, 50-336, AND, 50-423

1.0 BACKGROUND

By letter dated February 11, 2021 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML21042B321), as supplemented by letters dated May 13, 2021 (ADAMS Accession No ML21133A285), September 15, 2021 (ADAMS Accession No. ML21259A079), and February 17, 2022 (ADAMS Accession No. ML22052A064),Dominion Energy requested approval of Appendix E of fleet report DOM-NAF-2, Qualification of the Framatome BWU-I CHF Correlation in the Dominion Energy VIPRE-D Computer Code.

On November 30, 2021 (ADAMS Accession No. ML21334A192), the U.S. Nuclear Regulatory Commission (NRC) staff issued an audit plan that conveyed intent to conduct a regulatory audit to support its review of the subject license amendment. On January 26, February 1, and April 1, 2022, the NRC staff conducted a regulatory audit in a virtual environment.

The purpose of the audit was to gain understanding, to verify information, and to identify information that will require docketing to support the proposed licensing action. Based on the audit, the NRC staff intends to modify its one of two proposed limitations and conditions associated with its review of the topical report.

The NRC staff conducted the regulatory audit in accordance with the Office of Nuclear Reactor Regulation (NRR) Office Instruction LIC-111, Revi sion 1, Regulatory Audits (ADAMS Accession No. ML19226A274).

Enclosure

2.0 SCOPE AND PURPOSE

The audit was held on January 26, February 1, and April 1, 2022. The purpose of the audit was to help the NRC staff better understand the documentation and analysis results through interaction with the licensees technical experts and to help focus the staffs potential limitations and conditions.

3.0 AUDIT TEAM

The following NRC staff members participated in the audit:

Ed Miller - Project Manager Joshua Kaizer - Technical Reviewer

4.0 AUDIT REPORT

The purpose of this regulatory audit was to enhance the staffs technical understanding of the LAR, interact with the licensee technical staff supporting the LAR, and identify what information would need to be docketed to support completion of the review. The audit focus areas were to better understand the licensees proposed methodology and intended application of the analysis.

Table 1 identifies audit participants.

By the conclusion of the audit, the NRC staff indicated that it appeared that there was sufficient understanding of the applications and regions in which the code would be utilized. Further, the NRC staff has sufficient understanding to modify its one of two proposed limitations and conditions associated with its review of the t opical report. The modification of the limitation and condition will continue to sufficiently proscribe usage of the topical report to address NRC staff concerns while not inappropriately limiting its usage otherwise.

5.0 DOCUMENTS REVIEWED

The following documents were reviewed during the audit:

SM-1780, Addendum B Correction of Modeling Error in the WES162 Test Section SM-1785, Addendum B, Behavior of the BWU-I CHF Correlation at Extremely Attachment A Subcooled Qualities SM-1785, Addendum B, Modeling of the Single Rod Tests by Campanile et. al.

Attachment B (1996)

6.0 CONCLUSION

The purpose of the audit was to gain understanding, to verify information, and to identify information that will require docketing to support the proposed licensing action. As a result of the audit, the NRC staff intends to modify its one of two proposed limitations and conditions associated with its review of the topical report.

Date: April 14, 2022

Table 1 NRC Audit - Attendees January 26, February 1, and April 1, 2022

Attendee Name Affiliation Ed Miller NRC - NRR Joshua Kaizer NRC - NRR Gary Miller Dominion - Nuclear Regulatory Affairs Jonathan Ford Dominion - Nuclear Engineering and Fuels John Harrell Dominion - Nuclear Engineering and Fuels Matthew Lepcio Dominion - Nuclear Engineering and Fuels Brian Mount Dominion - Nuclear Engineering and Fuels Nawal Valliani Dominion - Nuclear Engineering and Fuels

ML22101A152 OFFICE NRR/DORL/LPL2-1/PM NRR/DORL/LPL2-1/LA NRR/DSS/SFNB/BC NAME GEMiller KGoldstein RLukes DATE 4/14/2022 04/11/2022 4/14/2022 OFFICE NRR/DORL/LPL2-1/BC NAME MMarkley (JLamb for)

DATE 4/14/2022