Event Notification Report for October 06, 2025

AGREEMENT STATE REPORT - STOLEN MOISTURE DENSITY GAUGE

The following information was provided by the Texas Department of State Health Services (the Department) via email:

"On October 6, 2025, at approximately 0900 CDT, the Department received a call from the radiation safety officer (RSO) to report a moisture density gauge was stolen from a company vehicle parked in a gated parking lot at a hotel in Houston. The RSO stated the gauge was chained and locked inside the cab of the vehicle. The RSO stated the handles were pulled from the transport case. The unit is a Troxler model 3440 (S/N 30621) containing a Cs-137 source of 8 mCi and an Am-241/Be source of 40 mCi.

"Additional information will be provided in accordance with SA-300 Reporting requirements."

Texas incident number: 10232

THIS MATERIAL EVENT CONTAINS A 'Less than Cat 3' LEVEL OF RADIOACTIVE MATERIAL

Sources that are "Less than IAEA Category 3 sources," are either sources that are very unlikely to cause permanent injury to individuals or contain a very small amount of radioactive material that would not cause any permanent injury. Some of these sources, such as moisture density gauges or thickness gauges that are Category 4, the amount of unshielded radioactive material, if not safely managed or securely protected, could possibly - although it is unlikely - temporarily injure someone who handled it or were otherwise in contact with it, or who were close to it for a period of many weeks. For additional information go to http://www-pub.iaea.org/MTCD/publications/PDF/Pub1227_web.pdf

AGREEMENT STATE REPORT - DAMAGED MOISTURE DENSITY GAUGE

The following information was provided by the Texas Department of State Health Services (the Department) via phone and email:

"On October 6, 2025, at 1324 CDT, the Department was notified by the licensee's radiation safety officer (RSO) that while performing a measurement with a Troxler model 3440 moisture/density gauge, the technician was struck and killed by a piece of equipment. The gauge contains a 40 millicurie americium-241 source and a 9 millicurie cesium-137 source. The gauge appeared to have some minor damage. The RSO stated the gauge was picked up by a member of the HAZMAT team and placed on the tailgate of the licensee's truck. It was noted that the cesium source was sticking out of the bottom of the gauge about 2 inches. The HAZMAT team reported to the RSO the dose rate at 5 feet from the gauge was reading 5 rem per hour. (Calculation of the gamma dose from the cesium source at 5 feet would be 1.24 millirem/hr.). The RSO stated he had personnel and equipment at the site to measure the dose rate, but the emergency response personnel would not let them enter the area. The RSO stated they had evacuated all personnel out to 100 feet.

"At 1422 CDT, the RSO reported the police allowed them to enter the area and perform a radiation survey. The RSO reported their survey showed less than 1 millirem per hour at 5 feet from the gauge. The RSO stated they placed the gauge into the transport case and then into the steel security box in the truck bed to transport the gauge back to their office. The gauge will be sent to the manufacturer for inspection.

"Additional information will be provided as it is received in accordance with SA-300."

Texas incident number: 10233

AUTOMATIC REACTOR SCRAM

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

"At 0321 CDT on 10/6/2025, with Unit 1 in mode 1 at 23 percent power, the reactor automatically tripped due to reactor water level rising to the reactor protection system auto-scram setpoint, prior to the manual scram being completed. The trip was not complex with all systems responding normally post-trip. The trip occurred as the station was transitioning level control from the motor driven reactor feed pump to the `A' turbine driven reactor feed pump as part of plant startup. 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).

"Operations responded using emergency operating procedure 1 (reactor pressure vessel control) and stabilized the plant in mode 3. Decay heat is removed by discharging steam to the main condenser using the turbine bypass valves.

"The digital feedwater level control system response is still under investigation.

"There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified."

EN Revision Imported Date: 10/7/2025

EN Revision Text: OFFSITE NOTIFICATION DUE TO ONSITE FATALITY

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

"On October 6, 2025, at 0627 EDT, a notification to the Occupational Safety and Health Administration (OSHA) was initiated due to a Dominion employee experiencing a non-work-related medical event that resulted in the employee passing. When the issue was identified, the station first aid team responded to administer first aid. Upon arrival, the employee was nonresponsive with no pulse. The employee was pronounced deceased on site at 0627 EDT. A report to OSHA will be made in accordance with federal requirements. This event is reportable to the NRC per 10 CFR 50.72(b)(2)(xi) since another government agency will be notified of this fatality.

"The employee was in the plant protected area and was not contaminated.

"The NRC Resident Inspector has been notified."

FITNESS FOR DUTY EVENT

The following information was provided by the licensee via phone:

A licensee non-licensed supervisor failed a random fitness-for-duty test. The individual was not on-site at the time of the determination. The individual's access has been revoked.

The NRC Resident Inspector has been notified.