Event Notification Report for October 31, 2025

AGREEMENT STATE REPORT - DAMAGED MOISTURE DENSITY GAUGE

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

"BRC received notification that a Troxler gauge, model 3430 (8 mCi Cs-137, 40 mCi Am-241-Be), was impacted by a bobcat construction vehicle. The yellow case of the gauge is significantly damaged, but the licensee states the source rod was successfully retracted. The area has been roped off with a 20 foot radius. An inspector has been assigned for immediate response."

Florida incident number: FL25-103

AGREEMENT STATE REPORT - MEDICAL EVENT

The following is a summary of information received from the New York City Department of Health via email:

Memorial Sloan Kettering Cancer Center reported a Y-90 TheraSphere treatment to one site in the liver out of four resulting in 20.7 percent less dose than intended. The planned dose to the treatment site was 235 Gy; only 187 Gy was delivered.

The treatment involved four vials to be used. Two of the vials were mistakenly switched during the treatment, resulting in the incorrect dose to one location. The patient was informed.

New York item number: NY250006

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.

FITNESS FOR DUTY EVENT - PROGRAMMATIC FAILURE

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

"At 0815 CDT, on October 29, 2025, fitness-for-duty (FFD) program administrators identified that a contract employee, who was required to be part of the FFD program random testing pool, had been inadvertently removed from the pool on October 20, 2025. The employee's protected area access has been placed on hold in accordance with the station process. The issue has been placed into the site corrective action program for further review and evaluation to determine the cause. This event notification is being made in accordance with 10 CFR 26.719(b)(4).

"The NRC Resident Inspector has been notified."

EN Revision Imported Date: 11/3/2025

EN Revision Text: PART 21 - POSITIVE BATTERY POST SEPARATION

The following is a summary of information provided by Paragon Energy Solutions via email:

In May 2025, Quad Cities experienced positive battery post separation from three cells in a safety related battery string at the post seal nut region. Paragon dispatched engineering resources to provide technical assistance to the station during battery string replacement and to perform an initial assessment of the condition. The current postulated cause of the post separation is due to a corrosion mechanism that is still under investigation. In September 2025, Calvert Cliffs reported separation of a positive post from a cell upon initiation of a service test discharge resulting in electrical arcing at the cell post area.

Paragon has not yet identified a defect in the cell post design or manufacturing process which, if corrected, would prevent or mitigate this condition. The affected battery cells have been in service for 14 years and 11 years, respectively. This phenomenon only affects the positive posts on the battery, and the area of the post where corrosion occurs is not visible during routine inspection. Paragon is not stipulating that high cell voltage is the primary indication of the corrosive effect in the positive post, but this indication may allow sites to ensure cells are adequately evaluated for post integrity. Paragon recommends licensees continue normal battery maintenance procedures contained in station instructions.

Affected Plants
Region 1 - Beaver Valley, Calvert Cliffs, Fitzpatrick, Ginna, Millstone, Nine Mile Point, Seabrook
Region 2 - Brunswick, Catawba, McGuire, Robinson, Shearon Harris, Turkey Point
Region 3 - Davis Besse, Dresden, LaSalle, Quad Cities
Region 4 - Callaway, Comanche Peak, Palo Verde, River Bend, South Texas Project

Paragon Contact Information:
Richard Knott
Vice President, Quality Assurance
(518) 450-9706 (C)

*** UPDATE ON 10/31/2025 AT 0711 EDT FROM RICHARD KNOTT TO SAMUEL COLVARD ***

The following information summary was provided by email:

Further analysis is needed and expected to be completed by 12/15/2025. Oconee was added to the list of affected nuclear power plants. Interim advice to licensees was given.

Notified R1DO (Young), R2DO (Mckown), R3DO (Ziolkowski), R4DO (Vossmar), and the Part 21/50.55 Reactors group.

AGREEMENT STATE REPORT - WORKER POTENTIALLY EXCEEDED OCCUPATIONAL DOSE LIMIT

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

"On October 27, 2025, Acuren Inspection, Inc. notified the Department that an industrial radiography trainee dosimetry badge had been reported as an overexposure of 8 rem from Landauer. While talking with the radiation safety officer (RSO), the Department was informed that the radiographer trainee had only worked as a trainee in Louisiana for approximately seven weeks before being transferred to Orange, Texas. The RSO indicated that the trainee worked with at least three different crews at different job sites around their Kenner satellite office over the time period of mid-May to early July 2025."

Louisiana report ID number: LA20230011

AUTOMATIC REACTOR SCRAM

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

"At 1346 CST with Unit 1 in mode 1 at 100 percent power, the reactor automatically tripped on turbine control valve fast closure due to a generator lockout. The trip was not complex with all systems responding normally post-trip. Due to the reactor protection system actuation while critical, this event is being reported as a four-hour, non-emergency notification per 10 CFR 50.72(b)(2)(iv)(B).

"Operations responded using emergency operating procedures and stabilized the plant in mode 3. Decay heat is being removed by discharging steam to the main condenser using the turbine bypass valves. Unit 2 is not affected.

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