Event Notification Report for October 15, 2026

EN Revision Imported Date: 10/14/2026

EN Revision Text: AGREEMENT STATE REPORT - EXTERNAL RADIATION EXCEEDS LIMITS

The following information was provided by the North Carolina Department of Health and Human Services Radioactive Materials Branch (RMB) via email:

"On October 6, 2026, Wilmington Field Services Center (WFSC) received a Dibble truck, USDOT # 465872, coupled with trailer HT004, carrying control rod drives from the Constellation Fitzpatrick facility. The shipment was being received under the State of North Carolina Radioactive Material License 065-317-3. Radiation surveys were performed in accordance with 10 CFR 20.1906. Survey results determined the radiation levels in the truck cab up to 2.2 mrem/hr exceeding the 2 mrem/hr limit specified in 10 CFR 71.47.

"The transportation carrier followed the exclusive use instructions contained in the shipping papers. The radiation levels at the outside of the package and conveyance met the exclusive use limits. There is no suspected excessive exposure to employees or members of the public. There is no suspected radioactive contamination of the shipment. The radiation safety officer and WFSC facility manager determined that this was reportable under the 10 CFR 20.1906 regulations. Notifications were made to Dibble, the carrier, as required.

"The NC RMB has assigned an inspector to this event, and we will follow up this report to complete the report."

AGREEMENT STATE REPORT - MEDICAL EVENT

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

On October 8, 2026, BRC received a report from the medical physicist at a hospital cancer center regarding an error that occurred during a stereotactic body radiation therapy treatment. The patient was scheduled to receive eight total fractions. It was later determined that the first three fractions, administered on September 26, September 29, and October 1, 2026, had been delivered to the wrong anatomical site.

According to the report, the physician had correctly identified the intended treatment location, but the site marking placed on the patient did not match the intended area. As a result, the treatment team delivered the initial three doses to the patient's left cheek rather than to the correct target location. The error was discovered on October 7 at approximately 1000 EDT during a review of the treatment setup.

Once the mistake was identified, the patient was informed of the event and provided with an updated treatment plan. The facility is preparing a detailed written report outlining the circumstances and contributing factors. Determination of the maximum dose received to the incorrect location is still pending.

The incident was referred to the BRC materials and licensing division for further review. An environmental consultant from BRC began the investigation on October 8. Additional documentation and analysis will continue as part of the follow up process.

Florida incident number: FL26-087

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 AND RECOVERED DENSITY GAUGE

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

"Bruin Geotechnical Services Inc. reported the loss of a Troxler moisture density gauge and transit case around 0600 PDT. The operator failed to close and secure the metal overpack box and close the tailgate of the truck prior to departure. The radiation safety officer (RSO) reports that the transit case was locked, but there was no source handle lock on the gauge.

"The gauge is a Troxler model 3411B (S/N 38996) and contains 8 mCi Cs-137 and 40 mCi Am-241/Be sources.

"Lancaster police and the California Highway Patrol were notified of the loss. Company staff began searching local roadways.

"Around 1100 PDT, Lancaster police notified the RSO that a member of the public had dropped off the gauge and case at their office.

"The gauge was recovered and returned to the licensee. Leak testing is being performed, and the gauge will not be used until negative results are confirmed by the vendor. RHB will continue to investigate this incident."

California 5010 number: 100826

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 SHUTTER

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

"On October 8, 2026, the licensee notified the Agency regarding a nuclear gauge whose source shutter mechanism had failed to function as intended. The gauge, an Industrial Dynamics model FT-100, contains a 300 mCi Am-241 sealed source. The licensee reported that the gauge was discovered with the source shutter stuck in the open position. Open is the normal operating position. The discovery was made on October 8, 2026, during routine maintenance. The licensee stated that there is no risk of additional radiation exposure to the public or workers due to this source shutter mechanism failure. The licensee has contacted Industrial Dynamics to have the gauge repaired."

"Additional Information will be made available in accordance with SA 300 reporting requirements"

Texas incident number: 10335
Texas NMED number: TX260043