Event Notification Report for October 14, 2026

EN Revision Imported Date: 10/14/2026

EN Revision Text: LEAKING SEALED SOURCE

The following information was provided by the licensee via phone:

On September 17, 2026, at 1300 CDT, the DHA radiation safety officer (RSO) at Fort Sam Houston was notified of a leaking 13.6 mCi Ni-63 sealed source from a gas chromatograph.

Wipes and leak tests were conducted. The wipes tested positive and the RSO is awaiting the results of the leak test. There were no reported exposures. The notification is being made in accordance with 10 CFR 31.5(c)(5).

Gas chromatograph information:
Manufacturer Agilent Technologies
Model: 7890A
S/N: US 13371009

* * * UPDATE ON 10/13/2026 AT 1610 EDT FROM RICARDO REYES TO CHRISTOPHER PRESCOTT * * *

The following information was provided by the licensee via email:

"On September 16, 2026, the health physics technician at Brooke Army Medical Center (BAMC) performed the routine semi-annual leak test of three Ni-63 generally licensed device sources. In accordance with manufacturer's instructions, the technician took two swipe tests of each source. Two swipes, pertaining to a single source (S/N U23893), returned Ni-63 counts above the minimum detectable activity. One swipe measured 0.015 microcurie which exceeded the 0.005 microcurie limit. The health physics technician immediately informed the facility associate radiation safety officer (ARSO).

"The operator/owner of the device placed the machine out of service and contacted the vendor. The ARSO conducted a survey of the area and determined there was no contamination outside the device.

"The BAMC ARSO coordinated with the owner of the device to return the source [to the manufacturer] on October 13, 2026. Disposal took place with ARSO oversight."

Notified (email) NMSS R1 (Ford), R4 (Katanic), NMSS Events Notification.

EN Revision Imported Date: 10/14/2026

EN Revision Text: MEDICAL EVENT

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

"On October 5, 2026, a patient undergoing Y-90 Therasphere radioembolization of the right medial tissue of the liver was underdosed by approximately 50 percent.

"The physician authorized user completed the administration as normal with no unusual circumstances noted at 1114 EDT. At 1317, during post-treatment measurements, the health physicist determined that only 52.5 percent of the Y-90 microsphere had been administered.

"The prescribed activity was 10.4 mCi, while the administered activity was 5.4 mCi.

"This was the third Y-90 administration in a series of four administrations to four separate target liver tissues.

"The other three administrations were completed as normal and within 20 percent of the prescribed activity.

"It is believed that the unadministered activity remained trapped in the catheter.

"The patient received approximately 620 Gy to the target tissue, which is clinically adequate. The patient will not need to be retreated."

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 - SHUTTER MALFUNCTION

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

"On October 6, 2026, the Department was contacted by a representative of the licensee to report a radiation event that had been identified at 1305 CDT. The licensee was performing routine work utilizing a fixed gauge device when the device operator received an alert from the control panel that a shutter had unexpectedly opened when it should have remained closed. The radiation safety officer was immediately notified. The shutter was able to be closed from the user console and was cycled a few times to ensure functionality.

"The device is a Mahlo model 11-011988. It contains an Eckert and Ziegler Pm-147 KAC.D3 source, S/N AH-4867. It has an assay of 1000 mCi as of April 15, 2016. It currently contains approximately 62 mCi.

"No employees were exposed to any elevated radiation levels. The manufacturer was notified and is currently coordinating with the licensee to get a service engineer on site. The Department will continue to follow-up with the licensee."

Wisconsin event report identification number: WI260017

FITNESS FOR DUTY

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

"On October 12, 2026, at 0724 CDT, Waterford Steam Electric Station Unit 3 was notified an Entergy supervisor had a confirmed positive test for alcohol during a for-cause fitness-for-duty test. The individual's access has been terminated.

"The fitness-for-duty policy violation is being reported under 10 CFR 26.719(b)(2)(ii).

"The NRC Senior Resident Inspector has been notified."

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."