ML22052A064
| ML22052A064 | |
| Person / Time | |
|---|---|
| Site: | Millstone, Surry, North Anna  |
| Issue date: | 02/17/2022 |
| From: | Lawrence D Dominion Energy Nuclear Connecticut, Dominion Energy Services, Virginia Electric & Power Co (VEPCO) |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 21-042D, DOM-NAF-2-A | |
| Download: ML22052A064 (2) | |
Text
Dominion Energy Services, Inc.
5000 Dominion Boulevard, Glen Allen, VA 23060 DominionEnergy.com February 17, 2022 U.S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D. C. 20555
~
Dominion
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Serial No.
21-042D NRA/GDM RO Docket Nos.
50-336/423 50-338/339 50-280/281 License Nos.
DPR-65/NPF-49 NPF-4/7 DPR-32/37 DOMINION ENERGY NUCLEAR CONNECTICUT, INC. (DENC)
MILLSTONE POWER STATION UNITS 2 AND 3 VIRGINIA ELECTRIC AND POWER COMPANY (DOMINION ENERGY VIRGINIA)
NORTH ANNA AND SURRY POWER STATIONS UNITS 1 AND 2 REQUEST FOR APPROVAL OF APPENDIX E OF FLEET REPORT DOM-NAF-2-A MODELING ERROR CORRECTION By letter dated February 11, 2021 [Serial No.21-042 (ADAMS Accession No. ML21042B321)], DENC and Dominion Energy Virginia (collectively, Dominion Energy) submitted Appendix E, "Qualification of the Framatome BWU-I CHF Correlation in the Dominion Energy VIPRE-D Computer Code," to Fleet Report DOM-NAF-2-A for NRC review and approval. Subsequent to that submittal, an error was identified in the VIPRE-D model for the WES162 test section that supports the BWU-I Experimental Database. The error results in VIPRE-D ignoring mixing vane grids in the top half of the fuel assembly within guide tube cells.
The modeling error has been corrected, and the VIPRE-D/BWU-I code/correlation limit has been recalculated with the corrected local conditions resulting in a 95/95 DNBR limit of 1.22. The recalculated limit is less than the 95/95 DNBR limit of 1.23 that was provided in our original submittal; consequently, the 1.23 limit remains conservative and bounding following correction of the modeling error. As a result, Dominion Energy's request for NRC approval of the 95/95 DNBR limit of 1.23 is unchanged.
If you have questions or require additional information, please contact Mr. Gary D. Miller at (804) 273-2771.
Douglas
. Lawrence Vice President - Nuclear Engineering and Fleet Support Dominion Energy Nuclear Connecticut, Inc.
Virginia Electric and Power Company
Commitments made in this letter: None Serial Number 21-042D Docket Nos. 50-336/423/338/339/280/281 /395 DOM-NAF-2, Appendix E - Model Correction Page 2 of 2 cc:
U.S. Nuclear Regulatory Commission - Region I 2100 Renaissance Blvd, Suite 100 King of Prussia, PA 19406-2713 U.S. Nuclear Regulatory Commission - Region II Marquis One Tower 245 Peachtree Center Avenue, NE Suite 1200 Atlanta, GA 30303-1257 R. V. Guzman Senior Project Manager U.S. Nuclear Regulatory Commission One White Flint North, Mail Stop 08 C-2 11555 Rockville Pike Rockville, MD 20852-2738 Mr. G. Edward Miller NRC Senior Project Manager - North Anna U.S. Nuclear Regulatory Commission One White Flint North, Mail Stop 09 E-3 11555 Rockville Pike Rockville, MD 20852-2738 Mr. L. John Klos NRC Project Manager - Surry U.S. Nuclear Regulatory Commission One White Flint North, Mail Stop 09 E-3 11555 Rockville Pike Rockville, MD 20852-2738 NRC Senior Resident Inspector Millstone Power Station NRC Senior Resident Inspector North Anna Power Station NRC Senior Resident Inspector Surry Power Station