Event Notification Report for January 29, 2026

EN Revision Imported Date: 1/29/2026

EN Revision Text: AGREEMENT STATE REPORT - SOURCES FAILED TO RETRACT

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

"On September 16, 2024, at 1415 EDT, the Department was notified by Alpek Polyester (the licensee) that while performing semi-annual shutter checks the licensee discovered that two gauges (model: Berthold LB 300 IRL) had cables that were malfunctioning, and that the sources were unable to be retracted to the shielded and locked position. One gauge contains a 6 mCi (original activity) cobalt-60 source and the other contains a 2.5 mCi (original activity) cobalt-60 source. Currently the cobalt sources are 1.07 mCi and 0.044 mCi, respectively. These sources were placed into service on September 17, 2011. On September 17, 2024, the department on-call duty officer met the licensee's radiation safety officer at 0900 EDT to perform a visual inspection and radiation survey of the gauge. The highest radiation measured was 0.5 microR/hr. The licensee has contacted a licensed vendor to schedule the repair of the drive cables."

* * * UPDATE ON 01/28/2026 AT 0903 EST FROM ANDREW ROXBURGH TO ERNEST WEST * * *

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

"The radiation safety officer (RSO) notified the Department on January 26, 2026, that it has scheduled the replacement of the gauge with serial number 1819-10-11 for the week of March 9, 2026. The licensee still foresees having possible issues with [the gauge with serial number SN 1818-10-11] as they were not able to fully retract the source in March of 2025. Plans are to replace the source, source holder, and detector as well. The licensee stated that if they are unable to retract the source, they will have another shutdown in September [of 2026] to have the source extracted by a licensed vendor."

Notified R1DO (Bickett) and NMSS Event Notification (Email) via email

AGREEMENT STATE REPORT - MEDICAL EVENT

The following information was provided by the California Radiation Control Program, Radiologic Health Branch (RHB), via email:

"On January 20, 2026, at approximately 1841 PST, the radiation safety officer and Associate Director of Environmental Health & Safety at Cedars Sinai Medical Center contacted RHB to report a medical event that occurred earlier that same day. The event involved an underdose to a patient during a radioembolization treatment for liver cancer using yttrium-90 (Y-90) TheraSphere microspheres. The prescribed activity was 3.01 GBq. Approximately 88.5 percent of the activity remained as residual activity [in the administration kit] due to a kink in the microcatheter used for delivery of the Y-90 microspheres.

"Cedars Sinai Medical Center will investigate to gain a better understanding of the details of the event. RHB will also investigate the medical event, to include the licensee's investigation results."

California 5010 number: 012026

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.

PART 21 - DEFECT WITH ELECTRIC ACTUATORS

The following is a summary of information provided by Paragon Energy Solutions, LLC via email:

Tennessee Valley Authority (TVA) experienced binding in several actuators (Schneider Electric part number MA-418-0-0-4) used to operate dampers associated with emergency diesel generator room ventilation. Paragon identified that precipitate particles from the lubricating oil can collect in the space between the small motor rotor and the stator thus preventing rotation of the shaft connected to the damper actuating linkage. This condition, if left uncorrected, could contribute to a safety hazard.
Paragon is working with TVA to define the extent of the condition and recommends Watts Bar segregate any spare actuators from the lots and monitor in service MA-418 actuator motors from different lots supplied for similar issues.

Paragon contact: Richard Knott, Vice President Quality Assurance, Paragon Energy Solutions, LLC, 7410 Pebble Drive, Fort Worth, TX 76118, 817-284-0077, rknott@paragones.com.

Affected plant: Watts Bar