ML24221A060
| ML24221A060 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 11/25/2024 |
| From: | Geoffrey Miller Plant Licensing Branch II |
| To: | Carr E Dominion Energy South Carolina |
| Miller, GE | |
| Shared Package | |
| ML24221A062 | List: |
| References | |
| EPID L-2019-PMP-0061 | |
| Download: ML24221A060 (1) | |
Text
November 25, 2024 Eric S. Carr Senior Vice President and Chief Nuclear Officer Innsbrook Technical Center 5000 Dominion Blvd.
Glen Allen, VA 23060-6711
SUBJECT:
VIRGIL C. SUMMER NUCLEAR STATION, UNIT 1 - STAFF ASSESSMENT OF UPDATED SEISMIC HAZARDS FOLLOWING THE NRC PROCESS FOR THE ONGOING ASSESSMENT OF NATURAL HAZARDS INFORMATION
Dear Eric Carr:
The purpose of this letter is to document the U.S. Nuclear Regulatory Commission (NRC) staffs assessment of seismic hazards at the Virgil C. Summer Nuclear Station, Unit 1 (VCSNS),
following the process for the ongoing assessment of natural hazards information.
The enclosed seismic hazard report provides the NRC staffs updated seismic hazard curves and response spectra for VCSNS 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 are included in the enclosed seismic hazard report. 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 South Carolina Electric & Gas Company (SCE&G)1 for VCSNS. Based on its comparison and evaluation of the updated seismic hazard curves, in combination with an estimate of the VCSNS seismic capacity and available information2 on the consideration of seismic events in VCSNSs approved risk-informed programs, the NRC staff has determined that no further regulatory evaluation of, or action to modify, the VCSNS 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 VCSNS 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).
1 On April 29, 2019, SCE&G changed its name to Dominion Energy South Carolina, Inc. (Dominion).
2 On January 25, 2024, the NRC staff met with Dominion to discuss preliminary results of this review (Agencywide Documents Access and Management System (ADAMS Accession No. ML24036A294)).
The NRC staff plans to make the enclosed staff assessment 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 ed.miller@nrc.gov.
Sincerely,
/RA/
G. Edward Miller, Project Manager Plant Licensing Branch II-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-395
Enclosure:
Seismic Hazard Report cc: Listserv
ENCLOSURE VIRGIL C. SUMMER NUCLEAR STATION SEISMIC HAZARDS REPORT
Package: ML24221A062 Letter: ML24221A060 Report: ML24221A061 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 8/8/2024 8/8/2024 10/22/2024 10/22/2024 OFFICE NRR/DRA/APLC/BC(A)
NRR/DORL/LPL2-1/BC NRR/DORL/LPL2-1/PM NAME ANeuhausen MWright MMarkley (ARivera-Varona for)
GEMiller DATE 10/21/2024 11/21/2024 11/25/2024 11/25/2024