ML19214A047

Emergency Core Cooling System Model Change Pursuant to the Requirements of 10 CFR 50.46 Submittal Schedule Commitment Change

ML19214A047
Person / Time
Site:	Surry
Issue date:	07/30/2019
From:	Mark D. Sartain Virginia Electric & Power Co (VEPCO)
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
19-305
Download: ML19214A047 (3)

Text

VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 July 30, 2019 10 CFR 50.46 U.S. Nuclear Regulatory Commission Serial No.: 19-305 Attention: Document Control Desk NRA/GDM: RO Washington, DC 20555 Docket Nos.: 50-280/281 License Nos.: DPR-32/37 VIRGINIA ELECTRIC AND POWER COMPANY SURRY POWER STATION UNITS 1 AND 2 EMERGENCY CORE COOLING SYSTEM (ECCS) MODEL CHANGE PURSUANT TO THE REQUIREMENTS OF 10 CFR 50.46 SUBMITTAL SCHEDULE COMMITMENT CHANGE

References:

1. Letter from J. Alan Price (Dominion Energy Virginia) to USNRC, "Virginia Electric and Power Company, Surry Power Station Units 1 and 2, 30-Day Report of Emergency Core Cooling System (ECCS) Model Changes Pursuant to the Requirements of 10 CFR 50.46, Serial No.12-420, July 10, 2012. [ADAMS Accession No. ML12199A061]

2. Letter from Mark D. Sartain (Dominion Energy Virginia) to USNRC, "Virginia Electric and Power Company, Surry Power Station Units 1 and 2, Emergency Core Cooling System (ECCS) Model Change Pursuant to the Requirements of 10 CFR 50.46, Submittal Schedule Commitment Change," Serial No.17-158, April 28, 2017. [ADAMS Accession No. ML17125A256]

By letter dated July 10, 2012 (Reference 1), Virginia Electric and Power Company (Dominion Energy Virginia) submitted a letter to the NRC with information related to an evaluation of fuel pellet thermal conductivity degradation (TCD) with fuel burnup in the Westinghouse Best Estimate Large Break Loss of Coolant Accident (LBLOCA) analysis methodology for Surry Power Station (SPS) Units 1 and 2 and its effect on peak cladding temperature (PCT). This letter contained a commitment to submit to the NRC for review and approval a LBLOCA analysis that applies NRG-approved methods that include the effects of fuel pellet TCD. A commitment due date of June 15, 2017 was indicated. By letter dated April 28, 2017 (Reference 2), Dominion Energy Virginia changed the commitment date for submittal of the LBLOCA analysis for Surry Units 1 and 2 from June 15, 2017 to August 30, 2019 due to delays in obtaining NRC approved methodologies that included the effects of fuel pellet TCD. These methodologies that explicitly account for TCD were subsequently approved by the NRC.

The LBLOCA analysis commitment for SPS Units 1 and 2 will utilize the Westinghouse FULL SPECTRUM' LOCA (FSLOCA') Evaluation Model with fuel rod inputs that explicitly account for fuel pellet TCD based on the Westinghouse PAD5 fuel

. .,. -~

Serial No.19-305 Docket Nos. 50-280/281 Page 2 of 3 performance code. However, an error associated with the Westinghouse FSLOCA' EM application has delayed completion of the engineering and licensing documentation to support submittal of the SPS FSLOCA' analysis by August 30, 2019. As a result, this letter revises the commitment date for submittal of the LBLOCA analysis for SPS Units 1 and 2 from August 30, 2019 to October 31, 2019.

If you have any questions or require additional information regarding this submittal, please contact Mr. Gary D. Miller at (804) 273-2771.

Respectfully, Mark D. Sartain Vice President - Nuclear Engineering and Fleet Support Commitment made in this letter:

By October 31, 2019, Dominion Energy Virginia will submit to the NRC for review and approval a LBLOCA analysis that applies an NRC-approved ECCS Evaluation Model that includes the effects of fuel pellet thermal conductivity degradation.

Serial No.19-305 Docket Nos. 50-280/281 Page 3 of 3 cc: U. S. Nuclear Regulatory Commission, Region II Regional Administrator Marquis One Tower 245 Peachtree Center Ave., NE Suite 1200 Atlanta, Georgia 30303-1257 Ms. Karen R. Cotton Gross NRC Project Manager Surry U.S. Nuclear Regulatory Commission One White Flint North Mail Stop 08 G-9A 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 NRC Senior Resident Inspector Surry Power Station