Event Notification Report for May 28, 2025

AGREEMENT STATE REPORT - DAMAGED PORTABLE GAUGE

The following information was provided by the South Carolina Department of Environmental Services (Department) via phone and email:

"The licensee informed the Department via phone on May 19, 2025, at approximately 1546 EDT, that one of their authorized users backed over a Humboldt Model 5001 EZ portable gauging device (Serial No. 5732), containing 11 millicuries of Cs-137 and 44 millicuries of Am-241:Be. The licensee reported that no immediate health and safety concerns had been identified.

"The on-call duty officer was dispatched to the construction site to investigate the event. The Humboldt Model 5001 EZ portable gauging device was crushed on one side of the device and the securing rod (depth rod) was transversely broken off. The source rod was intact, remained in the shielded position, and did not appear to be visibly damaged. Dose rate surveys at the surface of the gauge and at 1 meter indicated no elevated exposure. The Department performed swipe tests of the affected areas in addition to ambient dose rate surveys. All results were background. The licensee packaged the gauge within its transport case and a survey was performed to ensure compliance with Department of Transportation requirements (Transportation Index) prior to transporting it back to the licensee's facilities to await disposal.

"This event is still under investigation by the Department."

LOST TRITIUM EXIT SIGNS

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

Two tritium exit signs were reported lost or missing during a recent safety emergency lighting audit conducted on April 24, 2025. Despite a thorough internal review and inspection of storage, disposal, and installation records, the devices were unable to be located or disposition verified.

The licensee is in the process of updating all emergency exit signage and lighting. Additionally, they are removing the remaining six (6) self-luminous exit signs from their facility and will return them to lsolite for proper disposal in accordance with regulatory guidelines. To prevent any recurrence, the facility will no longer purchase or utilize self-luminous signage in the future.

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

There is no information of previous inventory records since the initial delivery around April 2016. Information about this event was previously reported to the NRC Region III office on May 12, 2025.

Maker: Isolite
Model Number: SLX-60
Serial Numbers: H56081 and H56088
Estimated Activity: 0.281 TBq tritium (H-3) or 7.59 Ci/ sign (TOTAL: 0.562 TBq or 15.18 Ci)
Date of Manufacture: March 2016

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 GAUGE

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

"The Department received notification from the licensee that an Instrotek 3500 Xplorer nuclear moisture/density gauge was run over by a water truck on a construction site. The source rod was bent but the source was still in the shielded position. The gauge contains 10 millicuries of Cs-137 and 40 millicuries of Am-241:Be. The Department has requested additional information and continues to investigate the event.

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

AGREEMENT STATE REPORT - MEDICAL EVENT

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

The radiation safety officer (RSO) called the BRC to report a medical event involving Y-90 microspheres. The RSO stated that on 5/16/2025 it was planned for the patient to receive two administrations of 22 mCi microspheres. It was discovered on 5/20/2025 at 1730 EDT that the patient received only an administration of 3.54 mCi for the first treatment and 3.35 mCi for the second treatment. The attending physician and patient have both been notified. A report from the RSO will follow.

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 SOURCE

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

"The radiation safety officer (RSO) called the BRC to report a lost Ge-68 pin source from their PET scanner. It was discovered missing about a week ago. The RSO said the source had a reference date of April 1, 2021, with an initial activity of 1.49 mCi. Apparently, the previous consultant tried to send it back to Eckert and Zeigler in 2021, but it was returned twice from the common carrier due to not being packaged properly. Eckert and Zeigler apparently never received the source. The RSO has copies of the paperwork from the common carrier, but the dates do not line up. The BRC Miami inspection office will follow up with an investigation."

Florida Incident Number: FL25-049.

INVALID CONTAINMENT ISOLATION

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

"This 60-day telephone notification is being made per the reporting requirements specified by 10 CFR 50.73(a)(2)(iv)(A) and 10 CFR 50.73(a)(1) to describe an invalid actuation of a general containment isolation signal affecting more than one system [for Browns Ferry Unit 2].

"On March 28, 2025, operations personnel were performing post-maintenance testing of 2-HS-64-33 [hand switch], which operates 2-FSV-64-33, the suppression chamber exhaust outboard isolation valve. When the hand switch was taken to 'open' multiple annunciators were received, including 9-5B window 34, 'Fuse Failure'. Light indications above the hand switch were not lit. This condition resulted in a 'B'-side partial group 6 isolation. All systems responded as expected.

"Plant conditions which initiate primary containment isolation system (PCIS) group 6 actuations are reactor vessel low water level (level 3), high drywell pressure, or reactor building ventilation exhaust high radiation (reactor zone or refuel zone).

"At the time of the event, these conditions did not exist; therefore, the actuation of the PCIS was invalid and there were no safety consequences or impact to the health and safety of the public as a result of this event.

"Upon investigation a fuse was found to be cleared, which was the cause of the isolation. The fuse was replaced, the condition was cleared, and all systems were realigned as necessary.

"This event was entered into the corrective action program as condition report 2002404.

"The NRC Resident Inspector has been notified of this event."

The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:
Units 1 and 3 were not affected.