05000395/LER-2025-002, (Vcsns), Automatic Actuation of an Emergency Diesel Generator
| ML25268A017 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 09/24/2025 |
| From: | Jenkins B Dominion Energy South Carolina |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| 25-212 LER 2025-002-00 | |
| Download: ML25268A017 (1) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(iv)(A), System Actuation |
| 3952025002R00 - NRC Website | |
text
Dominion Energy South Carolina, Inc. hereby submits VCSNS Licensee Event Report (LER) 2025-002-00. This report documents an automatic actuation of an Emergency Diesel Generator due to an offsite grid perturbation on August 11, 2025. The perturbation was momentary, lasting less than two seconds, and the diesel generator was not required to power the bus.
This event is being reported under 10 CFR 50.73(a)(2)(iv)(A), due to the actuation of an emergency ac electrical power system.
Should you have any questions, please call Mr. Justin Bouknight at (803) 941-9828.
Sincerely, Beth Jenkins Site Vice President V.C. Summer Nuclear Station Enclosure Commitments contained in this letter: None cc:
G. J. Lindamood - Santee Cooper J. Lara - NRC Region II G. Miller - NRC Project Mgr.
NRC Resident Inspector Marsh USA, Inc.
Dominion Energy South Carolina, Inc Virgil C. Summer Nuclear Station Bradham Boulevard & Highway 215, Jenkinsville, SC 29065 Mailing Address:
P.O. Box 88, Jenkinsville, SC 29065 DominionEnergy.com Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555 Serial No.: 25-212 VCS-LIC/JB R0 Docket No. 50-395 License No. NPF-12 DOMINION ENERGY SOUTH CAROLINA, INC.
VIRGIL C. SUMMER NUCLEAR STATION UNIT 1 (VCSNS)
LICENSEE EVENT REPORT 2025-002-00 AUTOMATIC ACTUATION OF AN EMERGENCY DIESEL GENERATOR
Abstract
On August 11, 2025, at 0212 ET, the 'A' Emergency Diesel Generator (EOG) automatically actuated, but was not required to power its associated bus. The 'A' EOG actuated upon detection of an undervoltage condition on Bus 1 DA during a grid perturbation. However, the perturbation was momentary and the bus continued to be powered by its normal offsite power source. All plant systems responded as expected to the grid perturbation and the 'A' EOG was secured and realigned for auto-start.
This event is being reported in accordance with 10 CFR 50.73(a)(2)(iv)(A).