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At 1728 EST on 11/15/2021, with Unit 1 in Mode 1 at 47 percent power, the reactor was manually tripped due to a main transformer fault. The trip was not complex, with all systems responding normally post-trip. Operations responded and stabilized the plant. Decay heat is being removed by the emergency feedwater system through the main condenser. Due to the Reactor Protection System actuation while critical, this event is being reported as a four-hour, non-emergency notification per 10 CFR 50.72(b)(2)(iv)(B). Additionally, due to the valid actuation of the emergency feedwater system, this event is being reported as a non-emergency notification per 10 CFR 50.72(b)(3)(iv)(A). There was no impact on the health and safety of the public or plant personnel. The NRC Senior Resident Inspector has been notified."

• * * UPDATE ON 11/16/21 AT 1649 EST FROM BRUCE BENNETT TO KERBY SCALES * * *

At approximately 0900 (EST) on 11/16/2021, it was identified that mineral oil from the faulted main transformer had surpassed the capability of the oil containment system and discharged into Lake Monticello. It is estimated that less than 50 gallons of mineral oil entered the Lake. The oil is contained with booms and cleanup is ongoing. The EPA National Response Center and the South Carolina Department of Health and Environmental Control have been notified. This is considered a news release or notification to other government agencies; therefore, this event is reportable under 10 CFR 50.72(b)(2)(xi). The NRC Senior Resident Inspector has been notified. Notified R2DO (Miller).

At 1337 (EDT) on 9/8/2021, V.C. Summer reported the overflow of the Nuclear Operations Building Lift Station (LS-3) to the South Carolina Department of Health and Environmental Control. The lift station overflow was due to a broken discharge pipe from Pump 1 to the common discharge header. The overflow was contained in the valve vault, basin gravel, and the nearby concrete surface. None of the overflow reached any storm drains or waters of the state. This release did not exceed any NRC regulations or reporting criteria. This notification is being made solely as a four-hour, non-emergency notification for a Notification of Other Government Agency. This event is reportable in accordance with 10 CFR 50.72(b)(2)(xi). There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified.

• * * RETRACTION ON 09/28/2021 AT 1405 EDT FROM JUSTIN BOUKNIGHT TO KERBY SCALES * * *

At 1712 EDT on 9/8/2021, V.C. Summer made Event Notification 55450 notifying the NRC of an environmental report to another government agency, in accordance with 10 CFR 50.72(b)(2)(xi). In the course of station response, it was determined that the lift station overflow did not exceed any federal, state or local reporting criteria or violate any permits. Following this investigation, the report to the South Carolina Department of Health and Environmental Control is considered a courtesy notification and the event does not meet reporting criteria under 10 CFR 50.72(b)(2)(xi). There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified. Notified R2DO (Miller)

At 2354 EST, on January 26, 2020, officials with the State Emergency Operations Center and Newberry County, SC were notified of an apparent inadvertent actuation of a single siren in the VC Summer Early Warning Siren System (EWSS). (VC Summer Nuclear Station) VCSNS received a report of siren actuation from a local resident at approximately 2340 EST. The EWSS indication at the Emergency Operations Facility showed siren #35 had actuated. A reset of the EWSS was performed. VCSNS is working to confirm actual siren activation and troubleshoot the issue. This event is still under investigation. This is a non-emergency notification of other government agency. This event is reportable in accordance with 10 CFR 50.72(b)(2)(xi). The NRC Resident Inspector has been notified. The Licensee notified state and local agencies.

• * * RETRACTION ON 1/29/2020 AT 1502 EST FROM HANK KIRKLAND TO ANDREW WAUGH * * *

The investigation of this event has concluded that EWSS siren #35 did not actuate. This conclusion was reached after interviewing residents who reside directly across the street from EWSS Siren #35, who confirmed that this siren did not actuate. Also, maintenance personnel investigations concluded that the local activation indication was erroneous, due to observed battery readings being normal. Had the siren actuated, its batteries would have been depleted or nearly depleted. The NRC Resident Inspector has been notified. Notified R2DO (Baptist).

This event is being reported in accordance with 10 CFR 50.72(b)(3)(iv)(A) as an event that resulted in a valid actuation of the Emergency Diesel Generator.

On January 18, 2018 at 1202 EST, V.C. Summer Nuclear Station (VCSNS) lost one of its two redundant offsite power supplies. The loss of the 115kV power supply created an undervoltage condition on the normal incoming Engineered Safety Features power supply to safety related bus 1DA. The 'A' Emergency Diesel Generator started and loads sequenced as designed. The 'A' Residual Heat Removal pump started but did not inject any water into the Reactor Coolant System. The 'A' Emergency Feedwater Pump started and ran for approximately 2 minutes. Other plant equipment and systems also responded as expected.

The loss of the 115kV power supply occurred due to an issue with a component in a switchyard, external to VCSNS. The cause of the event is still under investigation.

All loads have been transferred back to the offsite 115kV power supply at 1318 EST. The diesel generator was secured at 1321 EST, reset and is ready to auto-start.

The NRC Resident Inspector has been notified.

Off-site Notification to South Carolina Department of Health and Environmental Control (SCDHEC).

At approximately 1400 (EST) on 12/4/15, site personnel discovered a sanitary lift station overflowing in the owner controlled area. The overflow entered a nearby storm drain that discharges into Outfall 13. The estimated release volume is between 10-15 gallons. The release has been stopped. At 1448, an initial notification was made to SCDHEC. The overflow appears to be the result of securing electrical power to the general area, including the lift station, to support construction activities. Power has been restored and clean-up is in progress.

The NRC Senior Resident has been notified.

An individual approached the protected area and grabbed the fence. Local law enforcement assistance has been requested. The Security Team leader does not consider this to be hostile. An emergency declaration was made based on HU4.1, for a security condition that does not involve a hostile action. The licensee notified state and local agencies and informed the NRC Resident Inspector. Notified DHS SWO, FEMA Ops Center, NICC Watch Officer, and FEMA NWC and NuclearSSA via email.

• * * UPDATE STEVE WILSON TO DAN LIVERMORE AT 0649 ON 06/07/2015 * * *

The individual was taken into custody without incident. Notified R2DO (Rose), NRR EO (Morris), and IRD (GOTT). Notified DHS SWO, FEMA OPS Center, DHS NICC Watch Officer, and Nuclear SSA via email.

• * * UPDATE AT 1616 EDT ON 6/8/2015 FROM MICHAEL MOORE TO MARK ABRAMOVITZ * * *

Update to correct description of where the individual was apprehended.

An individual approached the outside of the administrative fence near the circulating water intake structure. Local law enforcement assistance was requested. The Security Team Leader does not consider this to be hostile.

This declaration was made based on HU 4.1, a security condition that does not involve Hostile Action.

The NRC Resident Inspector has been notified. Notified the R2DO (Rose).

At approximately 0848 (EST) on February 7, 2015, a contract employee was found unresponsive at a VC Summer Unit 1 facility outside the Owner Controlled Area. The VC Summer Medical Emergency Response Team responded to the scene and provided assistance until offsite medical personnel arrived. Emergency Medical Services arrived on the scene and transported the individual to a local area hospital. VC Summer has reported this to OSHA and is reporting this to the NRC in accordance with 10 CFR 50.72 (b)(2)(xi). The NRC Resident Inspector has been notified.

• * * UPDATE AT 1300 EST ON 02/16/15 FROM MICHAEL MOORE TO S. SANDIN * * *

At 0935 EST, on February 16, 2015 SCE&G notified OSHA that the contract employee had passed away. This update also corrects the second sentence of the initial notification that station personnel versus the Medical Emergency Response Team responded to the scene. The NRC Resident Inspector has been notified. Notified R2DO (Nease).

On April 18, 2014, V.C. Summer Nuclear Station (VCSNS) Unit 1 identified 3 reactor vessel head penetrations (9, 43 and 51) that did not meet the requirements of 10 CFR 50.55a(g)(6)(ii)(D) and ASME Code Case N-729-1. The station is in a refueling outage (RF21) and the plant is currently shutdown and defueled. The reactor vessel head contains a total of 66 penetrations and the volumetric inspection efforts are complete. The indications are not through wall as indicated by volumetric and bare metal visual inspections. The penetrations will be repaired to meet the requirements of 10 CFR 50.55a prior to returning the vessel head to service. The inspection results are reportable pursuant to 10 CFR 50.72(b)(3)(ii)(A). The NRC Resident Inspector has been notified. The licensee will notify the State of South Carolina and local counties.

• * * UPDATE FROM BETH DALICK TO JOHN SHOEMAKER AT 1302 EDT ON 4/26/14 * * *

On April 26, 2014, V. C. Summer Station (VCSNS) Unit 1 finalized the inspections of the reactor vessel head penetrations. Confirmatory dye penetrant inspections determined that penetrations 15 and 22 also did not meet the requirements of 10CFR50.55a(g)(6)(ii)(D) and ASME Code Case N-729-1. The station is in a refueling outage (RF21) and the plant is currently shutdown and defueled. The indications are not through wall as indicated by volumetric and bare metal visual inspections. The penetrations will be repaired to meet the requirements of 10CFR50.55a prior to returning the vessel head to service. The inspection results are reportable pursuant to 10CFR50.72(b)(3)(ii)(A). The NRC Resident Inspector has been notified. The licensee will notify the State of South Carolina and local counties. Notified R2DO (McCoy).