Event Notification Report for October 06, 2025

AGREEMENT STATE REPORT - LOST EXIT SIGNS

The following is a summary of information provided by the Colorado Department of Public Health and Environment (the Department) via email:

The Department received notification from the licensee that 10 exit signs containing 9.5 Ci of tritium each were lost in Boulder, Colorado.

Manufacturer: Isolite Corporation
Model number: 880-12-6
Isotope: H-3
Activity: 95 Ci

Colorado event report ID number: CO250030

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 - VEHICLE CARRYING NUCLEAR GAUGE INVOLVED IN AN ACCIDENT

The following information was received via email from the Virginia Radiation Materials Program (VRMP):

"At approximately 1020 EDT on September 26, 2025, VRMP was notified of an automobile accident involving a vehicle carrying a portable nuclear gauge. At approximately 0820 EDT on September 26, 2025, a Troxler model 3430 portable nuclear density/moisture gauge (S/N 36802), containing 9 mCi of Cs-137 and 44 mCi of Am-241, was in a vehicle that was struck from behind in Chesterfield, VA. While a relatively minor accident, once it was noted that the radioactive material was present, the Chesterfield Hazardous Material team responded.

"The vehicle was isolated (300-meter perimeter), and the highway was shut down for approximately 2 hours. The authorized user notified his supervisor (assistant radiation safety officer (RSO), who then notified the RSO. The [assistant RSO] went to the site to evaluate the gauge. She notified VRMP. Per the assistant RSO, the gauge was appropriately blocked, braced, and secured in the trunk of the car when it was rear-ended. The car sustained damage but there was no apparent damage to the case or gauge.

"The licensee and the hazmat team surveyed the case/gauge and readings were within acceptable ranges indicating no source exposure. The case/gauge was moved to another of the licensee's vehicles and returned to the licensee's storage facility for further evaluation. There were no injuries as a result of the accident and no radiation exposures.

"VRMP will follow up with an investigation."

Virginia event report number: VA250004

AGREEMENT STATE REPORT - LOST SOURCE

The following information was provided by the Florida Bureau of Radiation Control (BRC) via email:

"The radiation safety officer (RSO) with Citrus Cardiology Consultants in Crystal River, Florida, called the BRC this afternoon regarding a lost 94.6 microcurie Ge-68 source, S/N 2509-89. The RSO said the source is used in a BQC Styrofoam pillow for tuning a positron emission tomography (PET) camera. The RSO said an installer for their new PET camera, out of Houston, Texas, used the Ge-68 source with a Styrofoam pillow to tune the new PET and left the source and pillow in their hot lab. The pillow is approximately two feet long and crescent shaped.

"The RSO said nobody associated with the hot lab saw the BQC pillow, the source, or the box it supposedly came in. The installer has reciprocity with Florida. The company is Catalyst MedTech in Houston, Texas."

FL incident number: FL25-095

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 - LOST EXIT SIGNS

The following is a summary of information provided by the Colorado Department of Public Health and Environment (the Department) via email:

The Department received a notification from the licensee that three exit signs containing 17.5 Ci of tritium each were lost in Pueblo, Colorado.

Manufacturer: SRB Technologies
Model number: BR-20-BK
Isotope: H-3
Activity: 52.5 Ci

Event report ID number: CO250031

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

EN Revision Imported Date: 10/6/2025

EN Revision Text: TWO TRAINS OF ECCS INOPERABLE

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

"On October 2, 2025, at 1651 CDT, essential cooling water pump '1C' tripped. Essential chiller '1C' and cascading equipment, including emergency core cooling system (ECCS) train '1C,' was declared inoperable.

"Essential chiller '12A' and cascading equipment, including ECCS train '1A,' was concurrently inoperable for ongoing maintenance.

"This condition resulted in an inoperable condition on 2 out of 3 safety trains for the accident mitigating functions, including the train 'A' and train 'C' high head safety injection (SI), low head SI, containment spray, electrical auxiliary building heating ventilation and air conditioning (HVAC), and essential chilled water. All 'B' train safety related equipment remains operable. There was no impact on the health and safety of the public or plant personnel.

"The repair timeline is unknown. We have already entered the configuration risk management program to mitigate additional maintenance induced risk with a risk informed completion time of October 19, 2025, at 1140 CDT. We are limited by TS 3.7.7.C to restore 1 train of control room HVAC by October 5, 2025, at 1651 CDT.

"This condition is being reported as an eight-hour, non-emergency notification per 10 CFR 50.72(b)(3)(v)(D).

"The NRC Resident Inspector has been notified."

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

The 'C' emergency diesel generator is unavailable due to the loss of cooling water. Maintenance on the ECCS train '1A' is partially complete and operators are working to restore the train to an operable status prior to the technical specification deadline. The essential cooling water pump trip was due to a hot spot causing the pump to overheat. The cause of the hot spot is still under investigation.

AGREEMENT STATE REPORT - MEDICAL EVENT

The following is a summary of the information provided by the Kansas Departments of Health and Environment (Department) via email:

On September 29, 2025, the University of Kansas Hospital Authority reported that a patient had received a seed for localized treatment of a tumor in their breast tissue. The seed was inserted on July 30, 2025. The patient returned the following day, very ill, was evaluated, and found to have an infection. The physician determined that surgery for removal of the seed would need to be delayed, and the seed could not be removed before October 2, 2025. The dose calculation shows that 5 rem total effective dose equivalent will be reached on October 2, 2025. This report is open and more details are expected following a reactive inspection by the Department.

Device: IsoAid Advantage I124A
Source: 200 uCi I-125

KS Report Number: KS2500011

A Medical Event may indicate potential problems in a medical facility's use of radioactive materials. It does not necessarily result in harm to the patient.

AGREEMENT STATE REPORT - LOST RADIATION SHIELD

The following information was provided by the Florida Bureau of Radiation Control (BRC) via email:

"BRC received notification from Orlando Health on September 30, 2025, that a depleted uranium shield was disposed of alongside its Nuclear Medicine Adac Camera model MCD/AC. It was last accounted for in 2014. The shield was likely disposed of [during] the decommission and removal of the camera. No records of the [shield] removal are available."

FL Incident #: FL25-097

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

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.