Event Notification Report for October 13, 2025

CONCURRENT REPORT

The following information was provided by the licensee via phone and email:

"A 24-hour report was made to New Mexico Environment Department in accordance with discharge permit condition 30 and New Mexico Administrative Code (NMAC) 20.6.2.1203 on 10/15/2025 for an unauthorized discharge. This is a concurrent report in accordance with 10 CFR 70 Appendix A(c). On 10/14/2025, work to empty laboratory rinse water into an approved discharge route commenced in accordance with procedure. This routes the rinse water to a lined retention pond, as approved in Urenco USA's discharge permit. During transfer of the rinse water, it was identified that the rinse water was not being put into the intended location. It was determined that it was being put into a cement vault for a domestic water flowmeter. The contents of the tote are approximately 330 gallons of rinse waster from non-radiological labware for reagent preparation from the chemistry laboratory, containing primarily deionized water with dilute acids, detergents, and neutralized with sodium bicarbonate. It was analyzed to be within allowable limits for uranium concentration and pH in accordance with the discharge permit and NMAC 20.6.2.3103, prior to removal from the laboratory. This event has been put into the corrective action program and corrective actions are ongoing."

OFFSITE NOTIFICATION

The following is a summary of information that was provided by the licensee via phone and email:

On October 13, 2025, at 2305 CDT, South Texas Project issued a press release on the threat of a potential security concern directed against the licensee's facility and the resultant declaration of an Unusual Event. This media release was reported to the NRC in accordance with 10 CFR 50.72(b)(2)(xi): Any event or situation, related to the health and safety of the public or onsite personnel, or protection of the environment, for which a news release is planned or notification to other government agencies has been or will be made.

EN Revision Imported Date: 10/27/2025

EN Revision Text: AUTOMATIC REACTOR TRIP

The following information was provided by the licensee via phone and email:

"At 1552 EDT on October 14, 2025, with Unit 1 in mode 1 at 100 percent power, the reactor automatically tripped due to a turbine trip. 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.

"Due to the reactor protection system actuation while critical, this event is being reported as a 4-hour, non-emergency notification per 10 CFR 50.72(b)(2)(iv)(B) and an 8-hour, non-emergency notification per 10 CFR 50.72(b)(3)(iv)(A) for valid actuation of the reactor protection and emergency feedwater systems. There was no impact on the health and safety of the public or plant personnel. The NRC resident inspector has been notified."

The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:

A generator field breaker lockout occurred. In addition, a small fire was observed in the generator field breaker and extinguished in less than 15 minutes by the onsite fire brigade. The unit is stable in hot standby with emergency feedwater and main condenser steam dumps in-service.

AGREEMENT STATE REPORT - LOSS OF CONTROL OF RADIOACTIVE MATERIAL

The following is a summary of information provided by the Georgia Radioactive Material Program via phone and email:

On October 13, 2025, Applied Technical Services, LLC (ATS) shipped a radiography camera containing a sealed source to QSA Global via common carrier overnight delivery. The shipment originated from Augusta, Georgia and was destined for Burlington, Massachusetts.

On October 21, 2025, ATS was notified by QSA Global that they had yet to receive the device. ATS followed up with the common carrier to attempt to locate the device and get further status. Using the package tracking number, it was determined that the package arrived at the common carrier's sorting facility in Memphis, Tennessee on October 13, 2025. After further investigation, the package was located at the common carrier facility and will be shipped to QSA Global.

Camera information:
Manufacturer: QSA Global
Model: 880 Delta
Serial Number: D11255

Source Information:
Model: A424-9
Isotope: Ir-192
Activity: 102.8 Ci (as of 10/21/2025)

GA Incident Number: 110

THIS MATERIAL EVENT CONTAINS A 'Category 2' LEVEL OF RADIOACTIVE MATERIAL

Category 2 sources, if not safely managed or securely protected, could cause permanent injury to a person who handled them, or were otherwise in contact with them, for a short time (minutes to hours). It could possibly be fatal to be close to this amount of unshielded radioactive material for a period of hours to days. These sources are typically used in practices such as industrial gamma radiography, high dose rate brachytherapy and medium dose rate brachytherapy. For additional information go to http://www-pub.iaea.org/MTCD/publications/PDF/Pub1227_web.pdf

CONFIRMED POSITIVE FITNESS FOR DUTY (FFD) TEST

The following information was provided by the licensee via phone and email:

"At 1311 EDT on October 13, 2025, it was determined that a non-licensed supervisor had a confirmed positive test as specified by the FFD testing program. The individual's authorization for site access has been terminated at all Duke Energy facilities.

"The NRC Resident Inspectors have been notified."

EN Revision Imported Date: 10/21/2025

EN Revision Text: NOTIFICATION OF UNUSUAL EVENT

The following information was provided by the licensee via phone:

An Unusual Event was declared on October 13, 2025, at 1914 CDT under EAL HU1.1 due to notification of a credible security threat.

State and local agencies were notified. The NRC Resident Inspector was notified.

Notified DHS SWO, FEMA Operations Center, CISA Central Watch Officer, FEMA NWC, DHS Nuclear (email), CWMD Watch Desk (email)

* * * UPDATE ON 10/13/2025 AT 2315 EDT FROM VERONICA ROHAN TO ADAM KOZIOL * * *

The Unusual Event was terminated on October 13, 2025, at 2148 CDT.

Notified R4RA (Monninger), NRR (Bowman), NSIR (Williams), R4DO (Miller), NRR EO (Mckenna), IR MOC (Grant), PAO (Gasperson).

Notified DHS SWO, FEMA Operations Center, CISA Central Watch Officer, FEMA NWC, DHS Nuclear (email), CWMD Watch Desk (email)