ML24036A294
| ML24036A294 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 02/13/2024 |
| From: | Geoffrey Miller Plant Licensing Branch II |
| To: | Stoddard D South Carolina Electric & Gas Co |
| References | |
| Download: ML24036A294 (1) | |
Text
February 13, 2024 LICENSEE:
Dominion Energy South Carolina, Inc.
FACILITIES: Virgil. C. Summer Nuclear Station, Unit No. 1
SUBJECT:
SUMMARY
OF JANUARY 25, 2024, PUBLIC MEETING WITH DOMINION ENERGY SOUTH CAROLINA, INC., CONCERNING REVIEW OF NEW SEISMIC HAZARD INFORMATION FOR VIRGIL C. SUMMER NUCLEAR STATION On January 25, 2024, an observation public meeting1 was held between the U.S. Nuclear Regulatory Commission (NRC) and representatives of Dominion Energy South Carolina, Inc.
(Dominion). The purpose of the public meeting was to discuss the NRC staffs ongoing evaluation of new seismic hazard information as it applies to the Virgil C. Summer Nuclear Station (Summer) under the Process for Ongoing Assessment of Natural Hazard Information (POANHI). Specifically, the meeting was for the NRC staff to present2 the information and assumptions used to perform its initial seismic hazard and risk evaluation. Additionally, the NRC staff provided a table of ground-motion inputs used in its analysis.3 The NRC staff slides discussed how the seismic hazards were derived from the new information. The meeting slides discussed the NRC staffs approach for and inputs to the preliminary seismic risk assessment of the new hazard information. In its discussion, the NRC staff identified some areas where additional information from the licensee using its seismic probabilistic risk assessment model would help refine the analysis. During the exchange, Dominion staff also identified areas in the determination of the seismic hazard input that may benefit from additional refinement.
NRC and Dominion staff discussed opportunities for additional interaction on the evaluation. No decision was made, but possible formats included additional public meetings, audits, and workshops.
1 The meeting notice and agenda are available in the ADAMS under Accession No. ML24010A091.
2 The NRC staff presentation slides are available in ADAMS under Accession No. ML24008A211.
3 The NRC staff ground-motion inputs are available in ADAMS under Accession No ML24008A218.
No regulatory decisions were made during the meeting.
A list of attendees is provided as an enclosure. One member of the indicated that indicated the NRC staff peak seismic input at 13 Hertz seemed low. The NRC staff agreed that additional discussion on this point may be worthwhile. Another member of the public questioned whether credit is allowed for beyond-design-basis equipment for earthquakes above the safe shutdown earthquake (SSE) of the plant. The NRC staff stated that, from a probabilistic risk perspective, credit is allowed with the amount of credit adjusted for the reduced likelihood of availability of that equipment as the seismic acceleration increases above the SSE.
Please direct any inquiries regarding this meeting to Ed Miller at 301-415-2481 or 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:
List of Attendees cc: Listserv
Enclosure LIST OF ATTENDEES MEETING WITH VIRGINIA ELECTRIC AND POWER COMPANY JANUARY 25, 2024, VIRGIL C. SUMMER UNIT NO. 1 EVALUATION OF SEISMIC HAZARDS Name Organization Ed Miller Nuclear Regulatory Commission (NRC)
Zach Turner NRC Mike Markley NRC Shilp Vasavada NRC Cliff Munson NRC Scott Burnell NRC Steven Alferink NRC Qin Pan NRC Eric Bowman NRC Alysia Bone NRC Barbara Hayes NRC Sunwoo Park NRC Shakur Walker NRC David Dumbacher NRC Mac Read NRC KD Dials NRC Mike Franovich NRC Keith Tetter NRC Meena Khanna NRC Sarah Tabatabai NRC Craig Sly Dominion William Webster Dominion Ethan Treptow Dominion Daniel J. Vazquez Dominion Yan Gao Dominion Corey Wilson Dominion Daniel Madden Dominion Don Shue Dominion Brian Derreberry Dominion April Rice Dominion Jeremy Graham Dominion John Harrell Dominion Michael Vickery Dominion Creighton Adsit Dominion Penny Selman TVA Bob Post Enercon Matthew Degonish Ameren Name Organization Brett Titus NEI Andrew Mauer NEI Victoria Anderson NEI Frankie Pimentel NEI Fernando Ferrante EPRI Rob Choromokos EPRI John Richards EPRI Marco Ruvalcaba STP Deb Luchsinger PLSCorp Andrew Seifried LettiSci Gabriel Toro LettiSci Nicole Passmore Enercon Tim Sande Enercon Rachel Turney Enercon Jennifer Meek Enercon Trey Luebbert Ameren Justin Hiller Ameren Gregory Hardy SGH Mohamed Talaat SGH Timothy Graf SGH Andrea Maioli Westinghouse Ryan Walke AEP Vish Patel SNC Benny Ratnagaran SNC Philip Tarpinian CEG Fred Hazboun CEG Vince Andersen Jensen Hughes Larry Lee Jensen Hughes Edwin Lyman UCS Ram Srinivasan Unknown Affiliation Steven Satter Unknown Affiliation
Package: ML24036A308 Meeting Notice: ML24010A091 Meeting Summary: ML24036A294 OFFICE NRR/DORL/LPL2-1/PM NRR/DORL/LPL2-1/LA NRR/DEX/EXHB/BC NAME GEMiller KGoldstein BHayes DATE 2/9/2024 02/06/2024 2/9/2024 OFFICE NRR/DRA/APLC/BC NRR/DORL/LPL2-1/BC NAME SVasavada MMarkley DATE 2/10/2024 2/13/2024