Event Notification Report for April 17, 2026

EN Revision Imported Date: 4/17/2026

EN Revision Text: POTENTIAL MEDICAL EVENT

The following information was provided by the licensee via phone:

On April 1, 2026, the radiation safety officer (RSO) at BAMF Health Clinic received notification from their clinical trial sponsor, Heart Bio, that they identified unexpected trace amounts of thorium-228 in their ARTISAN AB001-101 trial medication that is currently being tested and administered via intravenous injection. The sponsor's preliminary dose analysis estimated that four different organs and tissues will receive over 50 rem to each organ from the thorium contaminate. The RSO is assisting Heart Bio in their investigation to identify the full scope of patients affected by the medication. The treating physician and the Food and Drug Administration (FDA) has been notified. The sponsor and an independent institutional review board are working with the RSO to notify the research patients.

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.

* * * RETRACTION ON 04/16/2026 AT 1252 EDT FROM COLTEN CONRAD TO THOMAS ECK * * *

The following information was provided by the licensee via phone:

Following consultation with Region III, it was determined that this event does not meet the medical event reporting criteria under 10 CFR 35.3045. The condition resulted from impurities introduced during the manufacturing process rather than from a misadministration of radioactive material, and therefore is not reportable under this provision.

Notified R3DO (Ruiz), NMSS (DiMarco), and NMSS Events Notification (email).

DEGRADED CONDITION

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

"On April 15, 2026, at 0920 EDT, while performing examinations of the 66 reactor vessel head penetrations, it was determined that two penetrations did not meet ASME Code Section XI [requirements]. Penetrations 54 and 59 will require repair prior to returning the vessel head to service. The indications were not through-wall and there was no evidence of leakage based on inspections performed on the top of the reactor vessel head. The examinations were being performed to meet the requirements of 10 CFR 50.55a(g)(6)(ii)(D) and ASME code case N-729-6 to find potential flaws/indications before they grow to a size that could potentially jeopardize the structural integrity of the reactor vessel head pressure boundary. This event is being reported as an eight-hour, non-emergency notification per 10 CFR 50.72(b)(3)(ii)(A).

"There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified."

AGREEMENT STATE REPORT - DAMAGED GAUGE

The following information was provided by the Alabama Office of Radiation Control via email:

"On April 7, 2026, at approximately 1230 CST, the Alabama Office of Radiation Control received a call from the radiation safety officer (RSO) for Building & Earth Sciences, LLC. The RSO reported that a Troxler 3440 portable moisture/density gauge with serial number 22948 containing 8 mCi of Cs-137 (serial number 75-4750) and 40 mCi of Am/Be-241 (serial number 47-18131) was struck by the edge of an excavator's track at a temporary jobsite located in Fultondale, Alabama. The RSO stated that after the incident, surveys were performed of the portable gauge in its transport container (did not exceed transportation index), the area where the incident occurred (no measurable readings), and the excavator tracks (no measurable readings). A leak test was also performed onsite prior to the gauge being transported back to Building & Earth Sciences, LLC's office for storage in their vault until it can be returned to Troxler for disposal. The RSO stated that the incident occurred because the technician turned his back for a moment while working near the excavator."

Alabama Incident Number: 26-04