ML21053A393

Report of 10 CFR 50.46 Emergency Core Cooling System Model Changes

ML21053A393
Person / Time
Site:	05200017
Issue date:	02/22/2021
From:	Mark D. Sartain Virginia Electric & Power Co (VEPCO)
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NA3-21-001
Download: ML21053A393 (6)

Text

VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 February 22, 2021 U.S. Nuclear Regulatory Commission Serial No.: NA3-21-001 Attention: Document Control Desk NRA/SS RO Washington, D. C. 20555 Docket No.: 52-017 License No.:NPF-103 VIRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA UNIT 3 REPORT OF 10 CFR 50.46 EMERGENCY CORE COOLING SYSTEM

{ECCS) MODEL CHANGES General Electric Hitachi Nuclear Energy (GEH) reported no changes to the ECCS model for the Certified Economic Simplified Boiling Water Reactor (ESBWR) Design in letter M200131 from Michelle P. Catts (GEH) to U. S. Nuclear Regulatory Commission, "ESBWR Design Certification Annual 10 CFR 50.46 Report for 2020," dated September 25, 2020.

The ECCS evaluation model change conclusion provided by GEH is applicable to the North Anna Unit 3 (NA3) Combined Operating License. Therefore, in accordance with 10 CFR 50.46 (a)(3)(ii), this report is being submitted on the NA3 docket.

Attachment 1 provides the Report of Changes in the GEH ECCS Evaluation Model.

Attachment 2 provides the 2020 Annual Reporting of 10 CFR 50.46 Margin Utilization for North Anna Unit 3.

If you have any questions regarding this submittal, please contact Mr. Shayan Sinha at (804) 273-4687.

Very truly yours, Mark D. Sartain

Vice President - Nuclear Engineering and Fleet Support Commitments made in this letter: None Attachments:

1. Report of Changes in GEH ECCS Evaluation Model

2. 2020 Annual Reporting of 10 CFR 50.46 Margin Utilization - North Anna Unit 3

Serial No. NA3-21-001 Docket No.52-017 Page 2 of 2 cc: {electronic distribution, except where noted)

U.S. Nuclear Regulatory Commission Region II Marquis One Tower 245 Peachtree Center Avenue, NE Suite 1200 Atlanta, GA 30303-1257 J. J. Shea, Jr., NRG D. Paylor, VDEQ M. Nichol, NEI M. K. Brandon, DTE R. Westmoreland, DTE

Serial No. NA3-21-001 Docket No.52-017 Attachment 1 2020 ANNUAL REPORT OF EMERGENCY CORE COOLING SYSTEM (ECCS)

MODEL CHANGES PURSUANT TO THE REQUIREMENTS OF 10 CFR 50.46 REPORT OF CHANGES IN GEH ECCS EVALUATION MODEL VIRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA UNIT 3

Serial No. NA3-21-001 Docket No.52-017 Attachment 1, Page 1 of 1 REPORT OF CHANGES IN GEH ECCS EVALUATION MODEL North Anna Unit 3 General Electric Hitachi Nuclear Energy (GEH) identified no changes or errors applicable to the ECCS Loss of Coolant Accident (LOCA) TRACG Evaluation Model for North Anna Unit 3 during 2020.

Serial No. NA3-21-001 Docket No.52-017 Attachment 2 2020 ANNUAL REPORT OF EMERGENCY CORE COOLING SYSTEM (ECCS)

MODEL CHANGES PURSUANT TO THE REQUIREMENTS OF 10 CFR 50.46 2020 ANNUAL REPORTING OF 10 CFR 50.46 MARGIN UTILIZATION VIRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA UNIT 3

Serial No. NA3-21-001 Docket No.52-017 Attachment 2, Page 1 of 1 Report of Changes in GEH ECCS Evaluation Model Plant Name I North Anna Unit 3 (Docket 52-017)

Utility Name I Virginia Electric and Power Company Reportinq Year: 2020 Evaluation Model: TRACG Vendor: GE Hitachi LBPCT Net PCT Absolute Effect PCT Effect Analysis of Record Licensing Basis PCT 600°F (LBPCT), with prior updates I. Prior 10 CFR 50.46 Changes or Error Corrections 2019 TRACG Channel Inlet £.\PCT= + 0°F + 0°F Subcooling Calculation 2019 TRACG Radiation Heat £.\PCT= + O"F + 0°F Transfer Calculation 2017 Fuel Rod Plenum £.\PCT= + 0°F + 0°F Temperature Update

11. 10 CFR 50.46 Changes or Error Corrections for 2020 None £.\PCT= + 0°F + 0°F Sum of 10 CFR 50.46 Changes £.\PCT= + 0°F + 0°F Projected LBPCT based on these 600°F changes