ML19183A172
| ML19183A172 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 06/26/2019 |
| From: | Mark D. Sartain Virginia Electric & Power Co (VEPCO) |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 19-304 | |
| Download: ML19183A172 (3) | |
Text
VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 June 26, 2019 10 CFR 50.46 U.S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555 Serial No.19-304 VIRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA POWER STATION UNITS 1 AND 2 NRA/DEA RO Docket Nos.
50-338/339 License Nos.
NPF-4/7 EMERGENCY CORE COOLING SYSTEM (ECCS) MODEL CHANGE PURSUANT TO THE REQUIREMENTS OF 10 CFR 50.46 SUBMITTAL SCHEDULE COMMITMENT CHANGE
. By letter dated May 16, 2012 (Reference 1), Virginia Electric and Power Company (Dominion) 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 North Anna Power Station (NAPS) 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 December 15, 2016 was indicated. By letter
. dated May 6, 2016 (Reference 2), Dominion changed the commitment date for submittal of the LBLOCA analysis for North Anna Units 1 and 2 from December 15, 2016 to June 30, 2019 due to delays in obtaining NRC approved methodologies that included the effects of fuel pellet TCD. These methodologies which explicitly account for TCD, were subsequently approved by the NRC.
The LBLOCA analysis commitment for NAPS 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
- performance code. An error associated with the Westinghouse FSLOCA' EM application has delayed completion of the engineering and licensing documentation to support submittal of the NAPS FSLOCATM analysis by June 30, 2019.
This letter revises the commitment date for submittal of the LBLOCA analysis for NAPS Units 1 and 2 from June 30, 2019 to October 31, 2019. The schedule takes into account the upcoming NAPS Unit 1 fall refueling outage and considers the overall plan for completing the NAPS FSLOCA ' analysis, which is in progress.*
Serial No.19-304 Docket Nos. 50-338/339 Page 2 of 3 If you have any further questions regarding this submittal, please contact Ms. Diane E.
Aitken at (804) 273-2694.
Respectfully, Mark D. Sartain Vice President - Nuclear Engineering and Fleet Support Commitments made in this letter:
By October 31, 2019, Dominion will submit to the NRC for review and approval a LBLOCA analysis that applies an NRG-approved ECCS Evaluation Model that includes the effects of fuel pellet thermal conductivity degradation.
References:
- 1. Letter from J. Alan Price (Dominion) to USNRC, "Virginia Electric and Power Company (Dominion), North Anna 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," Dominion Serial No.12-330, May 16, 2012.
- 2. Letter from Mark D. Sartain (Dominion) to USNRC, "30-Day Report of Emergency Core Cooling System (ECCS) Model Changes Pursuant to the Requirements of 10 CFR 50.46," Dominion Serial No.16-174, May 6, 2016.
cc:
U.S. Nuclear Regulatory Commission, Region II Regional Administrator Marquis One Tower 245 Peachtree Center Ave., NE Suite 1200 Atlanta, Georgia 30303-1257 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 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 NRC Senior Resident Inspector North Anna Power Station Mr. Marcus Harris Old Dominion Electric Cooperative Innsbrook Corporate Center Suite 300 4201 Dominion Blvd.
Glen Allen, VA 23060 Serial No.19-304 Docket Nos. 50-338/339 Page 3 of 3