Event Notification Report for August 14, 2026

EN Revision Imported Date: 8/14/2026

EN Revision Text: PART 21 REPORT - NON-COMPLIANT INSULATED CONDUCTOR

* * * This is not a new Part 21 condition. This EN will document all updates for this Part 21 condition, originally documented in EN 57243 and described below, that are made after November 2025. Refer to EN 57243 for updates made after the initial notification through November 2025. * * *

The following is a synopsis of information received via fax:

A reel of insulated conductor was found non-compliant due to failure of insulation tensile and elongation at break test following air oven aging. Wire from the non-compliant reel was delivered to nine plants.
Affected plants: Wolf Creek, Dresden, LaSalle, Limerick, Peach Bottom, Arkansas Nuclear One, Waterford, Susquehanna, and Davis Besse.

Reporting company point of contact:
RSCC Wire and Cable LLC
dba Marmon Industrial Energy and Infrastructure
20 Bradley Park Road
East Granby, CT 06026

Phillip Sargenski - Quality Assurance Manager
Phone: 860-653-8376
Fax: 860-653-8301
Phillip.sargenski@marmoniei.com

* * * UPDATE ON 12/04/2025 AT 1602 EST FROM CAROL GROSSO TO KERBY SCALES * * *

The vendor provided an update on their ongoing evaluation. The vendor continues to receive product from their customers to perform testing and evaluations. Test results for completed testing have been forwarded to customers. The process is still ongoing.

Notified R1DO (Schussler), R3DO (Hills), R4DO (Deese), and Part 21 group via email.

* * * UPDATE ON 01/12/2026 AT 1351 EST FROM CAROL GROSSO TO BRIAN P. SMITH * * *

The vendor provided an update on their ongoing evaluation. The vendor continues to receive product from their customers to perform testing and evaluations. Test results for completed testing have been forwarded to customers. The process is still ongoing.

Notified R1DO (Schussler), R3DO (Feliz-Adorno), R4DO (Dixon), and Part 21 group via email.

* * * UPDATE ON 02/05/2026 AT 1313 EST FROM CAROL GROSSO TO ERNEST WEST * * *

The following information was provided by the licensee via email:

"RSCC is awaiting samples from customers to complete our evaluation. As such, the evaluation is ongoing. To date, there has been no issues with the product we've received and tested. Test results have been forwarded to customers who have provided samples. We will continue this evaluation until all samples have been provided and we complete our testing."

Notified R1DO (Bickett), R3DO (Nguyen), R4DO (O'Keefe), and Part 21 group via email.

* * * UPDATE ON 03/06/2026 AT 1239 EST FROM CAROL GROSSO TO JOSUE RAMIREZ * * *

The following information was provided by the licensee via email:

"RSCC is still awaiting samples from customers required to complete RSCC's verification testing. Therefore, the evaluation is ongoing. To date, there has been no issues with the product that have been received and tested. Test results have been forwarded to customers who have provided samples. RSCC will continue this evaluation until all samples have been provided and testing has been completed."

Notified R1DO (Eve), R3DO (Edwards), R4DO (Dixon), and Part 21 group via email.

* * * UPDATE ON 04/07/2026 AT 1310 EDT FROM CAROL GROSSO TO TENISHA MEADOWS * * *

The following information was provided by the licensee via email:

"RSCC is still awaiting samples from customers required to complete our verification testing. Therefore, the evaluation is ongoing. To date, there has been no issues with the product that have been received and tested. Test results have been forwarded to customers who have provided samples. RSCC will continue this evaluation until all samples have been sent to the facility for testing and the results will be forwarded to each customer."

Notified R1DO (Dentel), R3DO (Stoedter), R4DO (Bloodgood), and Part 21 group via email.

* * * UPDATE ON 05/07/2026 AT 0930 FROM CAROL GROSSO TO KAREN COTTON * * *

The following information was provided by the licensee via email:

"The evaluation and verification testing is still ongoing. The company is awaiting samples from the remaining customers to conclude this activity. To date, there have been no issues with the products that have been received and tested. Test results have been forwarded to customers who have provided samples. The company will continue this evaluation until all samples have been sent to the company's facility for testing and the results forwarded to each customer."

Notified R1DO (Lilliendahl), R3DO (Stoedter), R4DO (Agrawal), and Part 21 group via email.

* * * UPDATE ON 06/05/2026 AT 1318 EDT FROM CAROL GROSSO TO BETHANY CECERE * * *

The following information was provided by the licensee via email:

"The evaluation and verification testing is still ongoing. To date, there has been no issues with the product we've received and tested. Test results have been forwarded to customers. We will continue this evaluation until everything is resolved."

Notified R1DO (Lilliendahl), R3DO (Zurawski), R4DO (Bloodgood), and Part 21 group via email.

* * * UPDATE ON 08/13/2026 AT 1422 EDT FROM CAROL GROSSO TO ERNEST WEST * * *

The following information was provided by the licensee via email:

"Our evaluation and verification testing is still ongoing. We are awaiting samples from one remaining customer. To date, there has been no issues with the product returned and tested. All results were sent to customers. We will continue this evaluation until all samples have been sent to our facility for testing and the results forwarded to each customer."

Notified R1 Reactor Events Notification (email), R3 Reactor Events Notification (email), R4 Reactor Events Notification (email), and Part 21 group via email.

EN Revision Imported Date: 8/13/2026

EN Revision Text: AGREEMENT STATE REPORT - MEDICAL EVENT

The following information was provided by the California Radiation Control Program via email:

"On July 8, 2026, at 1141 PDT, the certified nuclear medicine technologist (CNMT) and the assistant radiation safety officer (ARSO) at Los Angeles General Medical Center notified the principal radiation protection specialist at Los Angeles County Public Health Radiation Management of a misadministration involving Y-90 Theraspheres for a liver tumor. As of July 8, 2026, the prescribed activity was 4.28 mCi, corresponding to 450 Gray, and the delivered activity was 2.62 mCi, corresponding to 275 Gray. This meets the criteria for a reportable medical event because it exceeds both the 20 percent deviation from the prescribed activity and the 50 rem difference in intended dose.

"The CNMT reported that the incident was discovered on the afternoon of July 7, 2026. At this time, it appears the misadministration occurred on July 2, 2026, but was not reported to the radiation safety officer (RSO) or the ARSO. The CNMT and the RSO are continuing their investigation and gathering additional information."

California event number: 070826

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.

LOST AND FOUND SOURCE

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

On August 6, 2026, at 1255 EDT, the licensee's radiation safety officer was notified of a found source near Fort Wainwright, Alaska. On August 5, 2026, a member of the public found an M67 sight-unit at a local disposal/transfer site. The total activity for the source is 5.79 Ci of tritium. The source appeared to be intact and wipe samples were taken. There were no indications of personnel exposures. The source is currently with Fort Wainwright Police. It is unknown when the source went missing but the licensee will conduct an investigation.

AGREEMENT STATE REPORT - DAMAGED SOURCE HOLDER

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

"On August 6, 2026, the Agency received notification from the licensee regarding a source holder not operating as designed. The licensee reported that the source holder, a Vega model SHLG-3, contains an 8000 millicurie cesium-137 sealed source. On August 5, 2026, the licensee discovered that when the source shutter is in the open or operational position, radiation survey readings at the top of the shutter show normal exposure rates of around 2 milliroentgens per hour (mR/hr) at 1 foot. However, when the shutter is in the closed or shielded position, radiation readings at the top of the shutter are elevated and show exposure rates of around 375 mR/hr at 1 foot. The licensee reported that there is no risk of additional radiation exposure to members of the public or radiation workers when the on/off mechanism is in the open position. The licensee has contacted Vega to repair the unit."

Texas Incident Number: 10315

AGREEMENT STATE REPORT - STUCK SHUTTERS

The following information was provided by the Pennsylvania Bureau of Radiation Protection (the Department) via email:

"On July 1, 2026, at 1000 [EDT], the licensee's safety representative and a contracted technical specialist from Applied Health Physics, LLC notified the radiation safety officer (RSO) that the coating weight gauges' shutter mechanisms were malfunctioning. The gauges are Metso Automation Model 300 NDS gauges (serial numbers 9048LA, 9049LA, 9398LA, 9688LA) containing 2 Ci of Am-241 each. The shutters would not close when a user attempted to utilize the human-machine interface (HMI) and click `close shutter'. The maintenance department arrived approximately 30 minutes later. The air system was then placed in the closed position, ceasing air pressure to the devices. Upon the air being suspended, the shutters immediately closed on the devices. This indicated the issue was not with the shutter mechanisms. Both a solenoid and valve were replaced in a timely fashion; this returned proper functionality to the shutters. At no point were any individuals exposed to the primary beam of the devices.

"Before the July 1, 2026, incident, the shutters were last checked on June 2, 2026, and were functioning properly at that time.

"In addition, Global Gauge Corporation has been notified and is scheduled to service the devices and assess if there is a programming issue. The Department will perform a reactive inspection. More information will be provided as received."

PA event number: PA260014

AGREEMENT STATE REPORT - DOSE TO NURSING CHILD

The following information was provided by the Colorado Department of Public Health and Environment via email:

"A 33-year-old female patient, with an approximately 6-month-old nursing child, received a diagnostic nuclear medicine study. The patient was administered 300 microcuries of I-123 on the morning of August 3, 2026. The licensee neglected to confirm the patient's breastfeeding status or provide instructions on cessation of breastfeeding. The patient was released following the procedure, and no instructions regarding temporary or permanent cessation of breastfeeding were communicated. The licensee became aware of the error and was informed of the patient's breastfeeding status on the morning of August 6, 2026, because the patient called the radiation oncology and nuclear medicine department with questions. No immediate harm has been reported involving the patient or the nursing child. Initial dose estimates provided by the licensee indicate less than 5 rem total effective dose equivalent received by the nursing child, but the licensee is still determining if there is unintended permanent functional damage to an organ, as determined by a physician."

AGREEMENT STATE REPORT - FOUND SOURCE

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

"On July 25, 2026, the Agency conducted a radioactive source recovery operation and found an orphan source that was buried in the ground in Midland, Texas. The source is a 3M 6576 sealed source containing 100 millicurie (original activity date, April 1967) of cesium-137. The source was found in an unshielded condition and had no serial number. The Agency's investigations regarding the origin of the source could not determine the owner of the source. The discovery of the buried source was made on July 24, 2026, when a Texas Department of Public Safety nuclear detection unit officer on patrol along a county road detected elevated radiation levels with his vehicle on board radiation system while passing over a bridge. The officer stopped at the location and conducted a radiation survey which determined the presence of a cesium-137 source. The officer notified the Agency which then dispatched a health physicist to the site who confirmed these findings. It was determined that the radiation was localized at an area 8 feet below the road level and about 20 feet away from the bridge. The health physicist conducted contamination surveys at the location and found no removable contamination. The following morning, the source was recovered, placed in a shielded container, and transported to the Agency's sealed source storage facility. No individuals received a radiation dose in excess of the applicable dose limits during source recovery. Arrangements for the safe disposal of the source have been made by the Agency. This event was first reported by the Agency to the NRC Headquarters Operations Center on July 24, 2026, and updated on July 25 and August 7, 2026.

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

Texas incident number: I-10312
NMED report number: TX260027

MANUAL REACTOR TRIP

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

"At 0947 EDT on August 13, 2026, with Unit 1 in Mode 1 at 100 percent power, the reactor was manually tripped due to 3 control rods dropping into the core. The trip was uncomplicated with all systems responding normally post-trip. Operations stabilized the plant in Mode 3. Decay heat is being removed by discharging steam to the main condenser using the turbine bypass valves and main feedwater. Unit 2 is not affected.

"This event is being reported pursuant to 10 CFR 50.72(b)(2)(iv)(B).

"The NRC Resident Inspector has been notified."

PART 21 - NON COMPLIANT ELECTROMECHANICAL RELAYS

The following is a summary of information was provided by ABB Inc. via email:

On July 17, 2026, during calibration of a KF relay, ABB identified a deviation from the specified coil-assembly drying process. The affected coil assembly had completed the required air-drying stage, however, the subsequent force-drying (baking) stage had not been performed. The applicable process specifications required dipped transformers and coil assemblies to undergo a defined air-drying period followed by the specified force-drying (baking) cycle. After a review of production records, ABB identified 60 relays potentially manufactured under this condition and supplied to 12 customers. The affected population includes multiple class 1E electromechanical relay styles. Engineering testing of representative assemblies manufactured under the evaluated process conditions demonstrated compliance with the applicable 2.2 kV hi-pot acceptance criteria, and no immediate dielectric failure conditions were attributable to omission of the force-drying step that was identified under the tested dry condition. As of the date of this notification, ABB has not received any in-service failure reports from customers associated with the affected relays that are attributable to this deviation.

Affected Customers:
Catawba Nuclear Station
Oconee Nuclear Station
Georgia Power
Entergy Louisiana LLC
PSEG Nuclear LLC
Exelon Business Services
Westinghouse Electric
Duke Energy Carolinas
Dominion Energy Virginia
Constellation Energy Generation
Nextera Energy Resources

Responsible ABB Inc. Representative:
Percy Isaac
Plant Manager
ABB Inc.
2300 Mechanicsville RD
Florence, SC 29501
843-413-4700