ML22055A592
| ML22055A592 | |
| Person / Time | |
|---|---|
| Site: | 05200017 |
| Issue date: | 02/24/2022 |
| From: | Lawrence D Virginia Electric & Power Co (VEPCO) |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| NA3-22-001 | |
| Download: ML22055A592 (6) | |
Text
V IRGI N IA E LECTRIC AND P OWER C O M PANY RICHMOND, VIRGINIA 2 3 2 61
February 24, 2022
U.S. Nucle a r Regulatory Commission Serial No.: NA3 001 Attention: Document Control Desk NRA/SS RO Washington, D. C. 20555 Docket No.: 52 - 017 Lice ns e No.:NPF - 103
VI RG INIA ELEC T R IC AND POWER COMPAN Y NOR TH ANNA U NIT 3 R EPO R T O F 10 CF R 50.46 EMERGENC Y C ORE COO LI NG SY ST EM (ECC S) MODEL CH ANGES
General Electric Hitachi Nuclear Energy (GEH) submitted one error notification to the ECCS model for the Certified Economic Simplified Boiling Water Reactor (ESBWR)
Design in letter M210098 from Michelle P. Catts (GEH) to U. S. Nuclear R egulatory Commission, "ESBWR Design Certification Annual 10 CFR 50.46 Report for 2021," dated September 1, 2021. The evaluation model error was corrected, but because the notification was a zero-degree effect on the PCT calculation, there was no change to any reported-analysis results.
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. provides the Report of Changes in the GEH ECCS Evaluation Model. provides the 2021 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 y urs,
Douglas C. L rence Vice President - Nuclear Engineering and Fleet Support
Commitments made in this letter: None
Attachments:
- 2. 2021 Annual Reporting of 10 CFR 50.46 Margin Utilization - North Anna Unit 3 Serial No. NA3 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. NA3-22-001 Docket No.52-017
Attachment 1
2021 ANNUAL REPORT OF EM E RGENCY CORE COOLING SYSTEM (ECC S )
MODEL CHANGES PURSUANT TO THE REQUIREM E NTS OF 10 CFR 50.46
REPORT OF CHANGES IN GEH ECCS EVAL UATION MODEL
VIRGINIA ELECTR IC AND POWER COMPANY NORTH ANNA UNIT 3 Serial No. NA3 001 Docket No.52-017 Attachment 1, Page 1 of 1
REPOR T OF CHANGES I N GEH ECCS EVA LUA TION MODEL North Anna Unit 3
- 1. General Electric Hitachi Nuclear Energy (G E H) ide ntified the following change a nd error applicable to the ECCS Loss of Coolant Accident (LOCA) TRACG Evaluation Model for North Anna Unit 3 during 2021:
- 2021-04 : NON-CONDENSABLE GAS ERR OR I N ZERO CELL SIDE BRANCH.
A coding error was identified in TRACG04P which, under certain circumstanc es, miscalculates the amount of noncondens ab le gas flowing through a side branch of a component resulting in a m ass error a ccumulation over time in the analysis.
An error impact evaluation showed negligible effect on calculated PCT.
Therefore, the 50.46 impact estimate is 0°F.
Serial No. NA3-22-001 Docket No.52-017
Attachment 2
2021 ANNUAL REPORT OF EMERGENCY CORE COOLING SYSTEM ( ECCS )
MODEL CHANGES PURSUANT TO THE REQU I REMENTS OF 10 CFR 50.46
2021 ANNUAL REPORT ING OF 10 CFR 50.46 MARG IN UTILIZATION
VIRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA UNIT 3 Serial No. NA3 001 Docket No.52-017 Attac hm e nt 2, Page 1 of 1
Report of Changes in GEH ECCS Evaluation Mode l
Plant Name I North Ann a Unit 3 (Docket 52-017)
Utility Name I Virqinia Electric and Power Comp a ny
ReportinQ Year: 2021
Ev a luation Model: TRACG Vendor: GE Hitachi LBPCT Net PCT Absolute Effect PCT Effect Analysis of Record Licensing Basis PCT 600°F (LBPCT), with prior upd a tes I. Prior 10 CFR 50.46 Changes or Error Corrections 2019 TRACG Channel Inlet l\\PCT= + 0°F + 0°F Subcooling Calculation 2019 TRACG Radiation Heat l\\PCT = + 0°F + 0°F Transfer Calculation 2017 Fuel Rod Plenum l\\PCT = + 0°F + 0°F Temperature Update
- 11. 10 CFR 50.46 Changes or Error Corrections for 2021 2021 Non-condensable Gas l\\PCT = + 0°F + 0°F Error in Zero Cell Side Branch
Sum of 10 CFR 50.46 Changes l\\PCT = + 0°F + 0°F Projected LBPCT based on these 600°F changes