Event Notification Report for September 18, 2026

EN Revision Imported Date: 9/18/2026

EN Revision Text: AGREEMENT STATE REPORT - EQUIPMENT MALFUNCTION

The following is a summary of information provided by the California Department of Public Health, Radiologic Health Branch (RHB) via email:

On September 8, 2026, at approximately 1220 PDT, during high-dose-rate (HDR) brachytherapy treatment for a facial tumor, the HDR unit failed to retract the Ir-192 source after the intended exposure. Facility staff immediately recognized the unit's position alarm, entered the procedure room, evacuated the patient, and placed the source into the emergency lead container. The patient was in close proximity to the source for approximately 84 seconds before removal, resulting in an unintended additional dose.

The RSO is conducting dose assessments for both the patient and the staff who responded during the event.

A site visit is scheduled for September 10, 2026.

5010 Number: 090926

EN Revision Imported Date: 9/18/2026

EN Revision Text: AGREEMENT STATE REPORT - DAMAGED GAUGE

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

"At approximately 1100 EDT on September 9, 2026, VRMP was notified of an incident involving damage to a portable nuclear gauge. At approximately 0845, a Troxler model 3430 portable nuclear density/moisture gauge (S/N 36634), containing 8 mCi of Cs-137 (S/N 751-559) and 40 mCi of Am-241 (S/N 78-1392), was struck by a dirt loader in Reston, VA. The authorized user notified the radiation safety officer (RSO), who went to the site to evaluate the gauge's condition and then notified the VRMP.

"Per the RSO, the gauge was run over by the tire of the dirt loader while backing up and then again when it pulled forward. The gauge was completely shattered. The source rod was out and in the ground, taking a reading when it was struck. The end of the cesium source rod could not be completely returned to the shielded position, and the americium source block was intact. The area was cordoned off at roughly 15 ft around the damaged gauge. Surveys made by the RSO indicated readings of background to 0.06 mR/h at the perimeter. The agency provided guidance to the RSO to package the sources into a 5-gallon bucket with dirt and return them to the licensee's storage facility to be leak tested, and to consult with Troxler for disposition.

"[VRMP] will conduct an investigation."

Event report ID: VA260004

EN Revision Imported Date: 9/18/2026

EN Revision Text: AGREEMENT STATE REPORT - MEDICAL EVENT

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

"On September 10, 2026, at 1230 EDT, BRC received a report of a medical event involving a patient being treated with Y-90 Theraspheres. Only 40 percent of the prescribed 53.8 mCi dose was delivered to the patient. The treating physician notified the patient of the underdelivered dose. The incident was referred to the [BRC] materials section for further investigation."

Florida incident number: FL26-076

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 - MISSING SOURCE

The following information was provided by the Illinois Emergency Management Agency (the Agency) via phone and email:

"On September 3, 2026, Bard Brachytherapy (IL-02062-01) called to report a discrepancy in an order of Pd-103 brachytherapy seeds received from Theragenics Corporation in Georgia on September 3, 2026. The amount requested was 90 Pd-103 seeds; the amount received was 89 Pd-103 seeds.

"The licensee reported that the sources contained in the shipment (90 Pd-103 seeds, 3.06 mCi per seed) were counted twice with a counting machine, and once by hand. All three counts confirmed 89 seeds. Per the licensee, the package from Theragenics appeared in good condition, both the exterior, as well as the order contents and packaging. All the other Theragenics orders received this same date were recounted to confirm accuracy with no other seed discrepancies identified. A Theragenics associate radiation safety officer was contacted by the licensee on September 3, 2026, and informed of the discrepancy. The standing order was filled with the 89 seeds, and was shipped form Bard to the customer in Arizona.

"The missing source was reported to the Agency as required by 340.1210 and is 30-day reportable to the NRC. The event was reported to the NRC as required on September 10, 2026.

"No reactive inspection was conducted or deemed necessary. No corrective action needed to be taken by the licensee.

"This matter may be considered closed."

Illinois item number: IL260024

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: 9/18/2026

EN Revision Text: AGREEMENT STATE REPORT - STUCK RADIOGRAPHY SOURCE

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

"On September 10, 2026, the licensee notified the Agency of an industrial radiography source that failed to retract during exposure operations. The source is a 32-curie Iridium-192 sealed source contained in a QSA Delta 880 camera. The licensee reported that a radiography crew was performing an exposure at a fabrication shop at approximately 1315 CDT when the source failed to retract into the shielded safe position. The licensee stated that the crew was performing radiography work at an elevated location and was using a guide tube extension. When the crew removed the slack from the guide tube and extension, the guide tube became excessively angled, creating a restriction that prevented the source from being returned to the shielded position. The crew immediately secured the area and notified the licensee's radiation safety officer (RSO). The RSO responded to the site and successfully returned the source to its shielded position at approximately 1345 CDT. The licensee reported that no members of the public or workers received any significant radiation exposure from this event.

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

Texas incident number: I-10326

AGREEMENT STATE REPORT - FOUND ORPHAN GAUGES

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

On September 11, 2026, the Department received a notification from Vega Americas, Inc. regarding two radioactive gauges discovered on a fracking blender trailer acquired by J-Mac Completion, a Fort Worth-based company. The trailer, along with an attached truck, had been purchased at an equipment auction held on October 25, 2025.

Two devices were found attached to the trailer:
--Thermo Fisher gauge of unknown activity and model (no visible markings)
--Vega SHLD-1 gauge, S/N: 77970G, containing a 52 mCi Cs-137 source (as of January 1, 2020)

Vega reported that the SHLD-1 device was originally distributed as a generally licensed device to NRG Energy. It was later integrated into the trailer, which subsequently came into possession of Catalyst Energy Services. In October 2025, Catalyst consigned the blending trailer to Machinery Auctioneers for disposal.

J-Mac Completion is not licensed by Texas, the NRC, or any Agreement State. The company had not accessed the trailer until recently, when personnel noticed the gauges. The trailer has been stored in an isolated portion of J-Mac's facility, and based on current information, no exposures to individuals have occurred. An investigation is in progress.

Texas incident number: I-10327

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

PART 21 - CIRCUIT BREAKER DEFECT

The following is a summary of information provided by the licensee via fax and phone:

On July 9, 2026, ABB Florence was notified by NextEra Energy of a defect discovered during inspection prior to installation of a K-Line K-600 circuit breaker. A cotter pin was found missing from the breaker paddle. ABB's engineering evaluation confirmed that the missing cotter pin could compromise the breaker's ability to perform its intended safety function.

ABB has completed a thorough investigation to determine if this issue affects other circuit breakers or customers and found that this condition is isolated to nine breakers pertaining to a single order of 30 pieces supplied to Seabrook Station. No other orders or customers were affected.

To resolve this issue, and in accordance with customer instructions, ABB will provide replacement cotter pins with installation instructions. As a preventive action, ABB has added quality checkpoints during production and a final inspection to confirm the installation of the cotter pins.

Affected plant: Seabrook Station

Responsible ABB Inc. Representative:
Percy Isaac
Plant Manager
ABB Inc.
2300 Mechanicsville RD
Florence, SC 29501

PART 21 - BATTERY CELL VOLTAGE ISSUE

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

"On September 10th, 2026, Cook Nuclear Plant (CNP) completed a Part 21 evaluation concerning a voltage issue involving 1-BATT-CD plant battery, cell 50, in Unit 1. The affected [battery cell] is a C & D Technologies Inc. model LCR-33 NUC, manufactured in February 2016.

"During a quarterly surveillance test of the Unit 1 'CD' battery, cell 50 was found to have a voltage below the required technical specification (TS) limit. In accordance with CNP procedures, an attempt was made to restore the cell voltage to above the TS requirement. However, the cell did not hold its charge and the voltage degraded; it was replaced one week later.

"If this condition were present in multiple cells simultaneously, it could pose a substantial safety hazard due to the potential loss of required battery capacity or the failure of the battery to maintain its required mission time during a station blackout event. C&D Technologies Inc. reported that the low-voltage condition was caused by an internal short within the cell. The short prevented the cell from maintaining a stable current during charging. Failure analysis revealed a paste lump that had penetrated the separator and contacted the adjacent negative plate, causing the failure.

"This failure mode cannot be visually identified and is detectable only through the routine collection and evaluation of cell voltage data. The defect cannot be detected until the electrical short occurs. CNP is taking weekly battery terminal voltage [readings].

"A written notification will be provided within 30 days.

"Cook Nuclear Plant is the only facility known to be affected at the time of this report.

"The NRC Resident Inspector has been notified."