Event Notification Report for June 15, 2026

MANUAL REACTOR TRIP

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

"At 0339 EDT on June 11, 2026, control element assembly '14' dropped to the bottom of the core.
"To stabilize plant conditions, the reactor was manually tripped at 0341. This resulted in the actuation of the reactor protection system (RPS) when the reactor was critical and is being reported as a four-hour non-emergency notification per 10 CFR 50.72(b)(2)(iv)(B).
"There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified.
"There has been no impact to Unit 3 which remains at 100 percent power."

FITNESS FOR DUTY

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

"At 0909 EDT, on June 11, 2026, it was determined that a non-licensed contract supervisor failed a test specified by the fitness-for-duty (FFD) testing program. The individual's authorization for site access has been removed.

"The NRC Resident Inspector has been notified."

AGREEMENT STATE REPORT - STUCK OPEN GAUGE

The following information was provided by the Utah Division of Radiation Control via email:

"The Division of Waste Management and Radiation Control (DWMRC) was initially notified of a potential incident on June 11, 2026, at approximately 1530 MDT.

"On May 29, 2026, at approximately 1330 MDT, the licensee was verbally informed by a third-party service technician that two of their fixed gauges were stuck open.

"The licensee received the written report from a third-party service provider on June 11, 2026, at 1512 MDT. These gauges were in an HF [hydrofluoric] acid area.

"The gauges are an Ohmart SH-F1 Acid settler Interface 7LT502A and an Ohmart SHRM-P-84 containing 5 sources totaling 175 mCi.

"The licensee contacted the gauge manufacturer. The affected devices are scheduled to be replaced."

Utah Event Report ID No.: UT260005

AGREEMENT STATE REPORT - MEDICAL EVENT

The following information was provided by the Louisiana Department of Environmental Quality (LDEQ) via email:

"On June 6, 2026, LDEQ was notified of a medical event involving a Gamma Knife facility at the Thomas J. Moran Imaging Center in Baton Rouge, Louisiana. The patient was being treated for trigeminal neuralgia (facial nerve pain on the left side), not cancer. Gamma Knife was selected as the treatment, to deliver a high dose to a small target volume (80 gray).

"The oncologist and neurosurgeon contours down to the small size of the nerve for treatment. For this incident, the physician prescribed, planned, consented, and contoured to a nerve on the patient's right side.

"Treatment began as prescribed. Approximately one-third of the way through, after delivery of 23.8 gray, staff noticed a discrepancy and stopped the procedure. It was then discovered that the treatment had been directed to the wrong side of the patient's face.

"The prescription and plan were corrected, and the patient subsequently received the intended 80 gray dose to the correct nerve on the left side."

LA Event Report ID: LA 20260009

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.