Event Notification Report for September 17, 2026

EN Revision Imported Date: 9/17/2026

EN Revision Text: PART 21 - BREAKERS NOT CLOSING

The following is a summary of information provided by Westinghouse Electric Company, LLC, via email:

Westinghouse has identified motor cutoff switches that were manufactured with an incorrect coating applied to the internal springs. The springs were specified to be colored with dye for identification during manufacturing. Contrary to this requirement, some springs were colored using acrylic paint which has the potential to generate foreign material inside the switch. Accumulation of the acrylic paint particles between moving and stationary contacts could increase contact resistance and prevent the switch from making electrical contact. The identified deviation does not adversely affect the ability of the breakers to open on demand.

This issue is associated with commercially dedicated motor cutoff switches manufactured by Homewood Products Corp. and supplied by Westinghouse as part number 3D51113G02Y as part of the following:

-- spare switch assemblies (4A48863G01Y)
-- new and refurbished DS breakers supplied by Westinghouse
-- refurbished DHP breakers supplied by Westinghouse
-- DS breaker refurbishment kits (4A48813G11Y)

Westinghouse recommends replacement of any switch with a safety function at the earliest allowable opportunity. For applications where the breaker's safety function is to open, Westinghouse recommends verification of the breaker closing circuit resistance.

Westinghouse has entered the deviation into their corrective action program with an overall due date for resolution in the first quarter of 2027. It includes actions to review and update the associated commercial dedication process to prevent recurrence. Westinghouse will also interface with its suppliers to address the use of dye instead of paint and request that corrective actions be implemented to prevent recurrence of this issue.

Potentially affected plants: Braidwood, Byron, Callaway, Catawba, Clinton, Columbia, Comanche Peak, Palo Verde, Seabrook, Sequoya, South Texas, Vogtle, and Wolf Creek

Contact information:
Andrew Bowman
Manager - Global Nuclear Regulatory Affairs
Westinghouse Electric Company LLC
1000 Westinghouse Drive
Cranberry Township, Pennsylvania 16066
Office: 412-374-2363


* * * UPDATE ON 09/16/2026 AT 1351 EDT FROM ANDREW BOWMAN TO KAREN COTTON * * *

The following information was provided by Westinghouse Electric Company, LLC, via phone:

The Westinghouse part number was corrected to 3D51112G02Y from 3D51113G02Y.

NOTIFIED Part 21/50.55 Reactors, R1_Reactor Events, R2_Reactor Events, R3_Reactor Events, R4_Reactor Events

AGREEMENT STATE REPORT - STOLEN EXIT SIGN

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

"On September 8, 2026, a Wiedenbach Brown Lighting project manager, notified RHB via email that a tritium exit sign was stolen from an AMC theatre in Brentwood, CA on August 14, 2026. The details such as make, model, serial number and tritium content are still being sought out from the losing entity but since the sign certainly had at least 1 Ci of H-3, RHB is reporting it now. The incident has also been reported to the Brentwood Police Department under report number 260020181. RHB is investigating this matter further."

California 5010 Event Number: 090826


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

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

"At 1011 EDT, on September 15, 2026, it was determined that a licensed operator failed a test specified by the fitness-for-duty testing program. The individual's authorization for site access has been terminated.

"The NRC Resident Inspector has been notified."

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 9, 2026, the radiation safety officer (RSO) for a Dignity Community Care d.b.a. Northridge Hospital Medical Center, notified RHB of a potential reportable event that had occurred approximately 27 hours earlier.

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

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 (SN 36634), containing 8 mCi of Cs-137 (SN 751-559) and 40 mCi of Am-241 (SN 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

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 prescribed the 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

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 in Midland 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