ML21225A502

Request for Additional Information for North Anna Power Station, Units 1 and 2, Surry Power Station, Units 1 and 2, and Millstone Power Station, Units 2 and 3, Appendix E of Fleet Report Com-Naf-2 (EPID:L02021-LLT-0000) Public Version

ML21225A502
Person / Time
Site:	Millstone, Surry, North Anna
Issue date:	08/13/2021
From:	Geoffrey Miller Plant Licensing Branch II
To:	Mark D. Sartain Virginia Electric & Power Co (VEPCO)
Miller G
References
EPID L02021-LLT-0000
Download: ML21225A502 (4)

Text

OFFICIAL USE ONLY PROPRIETARY INFORMATION August 13, 2021 Mr. Mark D. Sartain Vice President - Nuclear Engineering and Fleet Support Innsbrook Technical Center 5000 Dominion Blvd Glen Allen, VA 23060-6711

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION - FOR NORTH ANNA POWER STATION, UNITS 1 AND 2, SURRY POWER STATION, UNITS 1 AND 2, AND MILLSTONE POWER STATION, UNITS 2 AND 3, APPENDIX E OF FLEET REPORT COM-NAF-2 (EPID: L-2021-LLT-0000)

Dear Mr. Sartain:

By letter dated February 11, 2021 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML21042B321), as supplemented by letter dated May 13, 2021 (ADAMS Accession No ML21133A285), Dominion Energy requested approval of Appendix E of fleet report DOM-NAF-2, Qualification of the Framatome BWU-I CHF [Critical Heat Flux]

Correlation in the Dominion Energy VIPRE-D Computer Code.

The NRC staff is reviewing the information contained in the request and has identified, in the enclosure, areas where additional information is needed to complete the review. To maintain the original review schedule, a response is requested within 30 days of this letter Enclosure 1 to this letter contains Proprietary information. When separated from Enclosure 1, this document is DECONTROLLED OFFICIAL USE ONLY PROPRIETARY INFORMATION

OFFICIAL USE ONLY PROPRIETARY INFORMATION M. Sartain If you have any questions, please contact me at (301) 415-2481 or via e-mail at ed.miller@nrc.gov.

Sincerely,

/RA/

G. Edward Miller, Project Manager Plant Licensing Branch 2-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulations Docket Nos. 50-280, 50-281, 50-338, 50-339, 50-336, and 50-423

Enclosure:

As stated cc w/encl: Listserv OFFICIAL USE ONLY PROPRIETARY INFORMATION

OFFICIAL USE ONLY PROPRIETARY INFORMATION REQUEST FOR ADDITIONAL INFORMATION OFFICE OF NUCLEAR REACTOR REGULATION North Anna Power Station, Units 1 and 2 Surry Power Station, Units 1 and 2 Millstone Power Station, Units 2 and 3

1. Please confirm that Dominion will use a process to generate the predicted CHF value that is consistent with the process used when determining the predicted CHF value of the validation data.

2. Please identify which fuel types have been validated using the BWU-I CHF model. For application to previously unanalyzed fuel types, such as AFA fuel, please demonstrate that the number of data points used for validation of that fuel type is sufficient for ensuring the accuracy of the DNBR limit. Specifically, ((

))

3. How will the BWU-I CHF model be restricted to its application domain when used in VIPRE-D?

Enclosure 2 OFFICIAL USE ONLY PROPRIETARY INFORMATION

ML21214A021 (Non-Public) ML21225A502 (Public)

OFFICE DORL/LPL2-1/PM DORL/LPL2-1/LA DSS/SFNB/BC DORL/LPL2-1/BC NAME GEMiller KGoldstein RLukes MMarkley DATE 8/13/21 08/12/21 8/13/21 8/13/21