Event Notification Report for November 09, 2026

AGREEMENT STATE REPORT - MEDICAL EVENT

The following is a summary of information provided by the Minnesota Department of Health via email:

On November 2, 2026, the licensee reported that a patient had an underdose during a Y-90 TheraSphere treatment. No dose was delivered to patient and all activity remained in the vial and tubing. The activity in the vial and tubing pretreatment and posttreatment was 1.78 GBq and 1.74 GBq, respectively. The patient was surveyed after the procedure with no radiation detected. The patient also had a post treatment SPECT which showed no activity. The licensee's procedures were followed. The licensee is working with the manufacturer to determine what might have happened.

Minnesota Event Report ID Number: MN260001

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.

IRRADIATOR SOURCE UNLOCKED WITH PERSONNEL IN EXPOSURE ROOM

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

On June 9, 2026, at approximately 1500 EDT, an operator unlocked the position interlock on the facility's 20,000 Ci Co-60 gamma source, which would have allowed the source to be removed from the safe position, with people present in the gamma exposure room. The facility-wide alarm sounded as designed. The operator immediately re-locked the position interlock, and personnel evacuated the gamma exposure room. The source never moved from the safe position.

This event is required to be reported per facility technical specification 6.6.2.1(g) due to inadequate procedure controls resulting in unsafe operation of the gamma irradiator.

The NRC project manager and a non-power reactor inspector have been notified.

UNUSUAL EVENT - RCP FIRE

The following information was provided by the licensee via phone:

On November 7, 2026, at 1500 EST, Robinson declared an Unusual Event due to a fire not extinguished within 15 minutes (EAL HU4.1). Fire alarms were received at 1448 EST. The pump was secured, and the plant fire brigade responded and extinguished the fire using a fire extinguisher at 1515 EST. The fire was on insulation for RCP `B'. Primary containment was set but pressure and temperature did not noticeably change. A reflash watch was posted.

State and local authorities were notified.

* * * UPDATE ON 11/07/2026 AT 1623 EST FROM STEVEN NORMAND TO ROBERT THOMPSON * * *

The following information was provided by the licensee via phone:

The Unusual Event was terminated at 1547 EST.

State and local authorities and the NRC Resident Inspector were notified.

Notified DHS SWO, FEMA Ops Center, FEMA NWC, CISA Central, CWMD Watch Desk, DHS Nuclear SSA (email), DHS NRCC THD Desk (email).