ML23214A202

Staff Assessment of Updated Seismic Hazards Following the NRC Process for the Ongoing Assessment of Natural Hazards Information

ML23214A202
Person / Time
Site:	North Anna
Issue date:	09/05/2023
From:	Geoffrey Miller NRC/NRR/DORL/LPL2-2
To:	Carr E Virginia Electric & Power Co (VEPCO)
References
Download: ML23214A202 (1)

Text

September 5, 2023 Mr. Eric S. Carr Senior Vice President and Chief Nuclear Officer Innsbrook Technical Center 5000 Dominion Blvd Glen Allen, VA 23060-6711

SUBJECT:

NORTH ANNA POWER STATION, UNITS 1 AND 2 - STAFF ASSESSMENT OF UPDATED SEISMIC HAZARDS FOLLOWING THE NRC PROCESS FOR THE ONGOING ASSESSMENT OF NATURAL HAZARDS INFORMATION

Dear Mr. Carr:

The purpose of this letter is to document the U.S. Nuclear Regulatory Commission (NRC) staffs assessment of seismic hazards at the North Anna Power Station, Units 1, 2, and 3 (North Anna) following the process for the ongoing assessment of natural hazards information.

The enclosed seismic hazard reports provide the NRC staffs updated seismic hazard curves and response spectra for North Anna that are based on the implementation of (1) a new seismic ground motion model for the central and eastern North America and (2) recent advances in site response analysis. The NRC staffs updated hazard curves and site amplification factors are included in the enclosed seismic hazard reports. The NRC staff conducted a screening evaluation that compared the updated seismic hazard curves contained in the attached report with previous seismic hazard curves developed by Virginia Electric and Power Company (VEPCO) for North Anna. Based on its comparison and evaluation of the updated seismic hazard curves in combination with an estimate of the North Anna seismic capacity and available information on the consideration of seismic events in North Annas approved risk-informed programs, the NRC staff has determined that no further regulatory evaluation of, or action to modify, the North Anna plant seismic risk licensing basis is warranted.

Although the NRC staff is taking no further action at this time, the control point seismic hazard curves developed by the NRC staff for these reports may be considered in the context of potential future evaluations of the North Anna sites by the NRC staff (e.g., future license amendment requests) consistent with agency policy procedures (e.g., NRC Management Directive 8.4, Management of Backfitting, Forward Fitting, Issue Finality, and Information Requests).

E. Carr The NRC staff plans to make the enclosed Seismic Hazard Reports publicly available five working days from the date of this letter. If you have any questions, please contact me at (301) 415-2481 or via email at ed.miller@nrc.gov.

Sincerely,

/RA/

G. Edward Miller, Project Manager Plant Licensing Branch II-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-338 and 50-339

Enclosure:

North Anna Power Station Seismic Hazard Report

ENCLOSURE NORTH ANNA POWER STATION SEISMIC HAZARDS REPORT

Package: ML23214A177 Report: ML23214A194 Letter: ML23214A202 NRR-106 OFFICE NRR/DORL/LPL2-1/PM NRR/DORL/LPL2-1/LA NRR/DEX/EXHB/BC NRR/DEX/D NAME GEMiller KGoldstein BHayes EBenner DATE 8/3/2023 8/2/2023 8/5/2023 8/7/2023 OFFICE NRR/DRA/APLC/BC OGC-NLO NRR/DORL/LPL2-1/BC NRR/DORL/LPLII-2/PM NAME SVasavada DRoth MMarkley GEMiller DATE 8/4/2023 8/21/2023 9/5/2023 9/5/2023