Event Notification Report for December 16, 2025

EN Revision Imported Date: 12/16/2025<br><br>EN Revision Text: AGREEMENT STATE REPORT - LOST GAS CHROMATOGRAPHY DEVICES

The following information was provided by the Illinois Emergency Management Agency (the Agency) via email:

"As a result of an ongoing investigation into unresponsive general licensees, the Agency became aware that five generally licensed Perkin-Elmer model n610-0063 gas chromatography devices, each containing 15 millicuries of Ni-63, are missing.

"Reportedly, in late 2024, the licensee went through a transition of layoffs and is currently being bought by another company. Due to the change in employees, the location of these devices is unknown.

"The licensee failed to properly transfer or dispose of the devices (serial numbers 4377, 6055, 6273, 6202, and 7067). The facility manager is currently trying to reach out to past employees for information. The Agency has reached out to the distributor to try and locate the devices.

"The quantity of radioactive material involved, while unlikely to be dangerous to the public, is reportable within 30 days to the Agency and the U.S. NRC. Investigation is ongoing, and any updates will be reported."

Illinois Event Number: IL250040

* * * UPDATE ON 12/15/2025 AT 1309 EST FROM KIMBERLY STICE TO ERNEST WEST * * *

The following is a summary of information provided by the Illinois Emergency Management Agency via email:

The facility manager was able to locate two of the devices (serial numbers 6055 and 7067) on 10/31/2025. On 12/01/2025, an additional two devices were located (serial numbers 4377 and 6273). There is still one device that is lost, but to date no further information has become available.

Notified R3DO (Orlikowski), NMSS Events Notification (email), and ILTAB (email).

THIS MATERIAL EVENT CONTAINS A 'Less than Cat 3' LEVEL OF RADIOACTIVE MATERIAL

Sources that are "Less than IAEA Category 3 sources," are either sources that are very unlikely to cause permanent injury to individuals or contain a very small amount of radioactive material that would not cause any permanent injury. Some of these sources, such as moisture density gauges or thickness gauges that are Category 4, the amount of unshielded radioactive material, if not safely managed or securely protected, could possibly - although it is unlikely - temporarily injure someone who handled it or were otherwise in contact with it, or who were close to it for a period of many weeks. For additional information go to http://www-pub.iaea.org/MTCD/publications/PDF/Pub1227_web.pdf

EN Revision Imported Date: 12/16/2025<br><br>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 is a summary of information provided by Paragon via 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.

*** UPDATE ON 12/15/2025 AT 1128 EST FROM RICHARD KNOTT TO ERNEST WEST ***

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

The evaluation of the defect is complete, and the following corrective actions are being taken:

1. Paragon will establish improved controls to ensure assembly of the post seal is per the design. Estimated completion date is 12/31/2025.

2. Paragon will issue a revised instruction and operations manual recommending enhanced monthly and annual visual inspection criteria. The estimated completion date is 02/16/2026.

Notified R1DO (Carfang), R2DO (Nielsen), R3DO (Orlikowski), R4DO (Agrawal), Part 21/50.55 Reactors (email).

AGREEMENT STATE REPORT - RECOVERED GAUGE

The following is a summary of information provided by the Florida Bureau of Radiation Control (BRC) via phone and email:

On December 5, 2025, at 2100 EST, an individual was involved in a minor traffic accident in Haines City, Florida, and was subsequently arrested for driving under the influence, possession of firearms, possession of tetrahydrocannabinol (THC) and marijuana, and terroristic threats. The individual's vehicle contained a moisture density gauge, which was seized by the police. The BRC is investigating to determine if the individual was lawfully in possession of the gauge. The moisture density gauge was secured and undamaged.

The gauge is licensed in Alabama with reciprocity in Florida.

Florida incident number: FL25-112

AGREEMENT STATE REPORT - LOST SOURCE

The following information was provided by the Illinois Emergency Management Agency (Agency) via phone and email:

"The Agency was contacted by GE Healthcare to report a CardioGen Rb-82 generator had been lost in transit. Tracking information shows the 65-pound Yellow-II package arrived at the [common carrier] hub in Memphis, TN on December 4, 2025, but shows no movement thereafter. The intended destination was Cardiology Partners in Lake Worth, FL. The carrier's hazardous goods team has been contacted and reports they are unable to locate the package. The Florida recipient has confirmed that the package did not arrive. There is no indication the generator was intentionally diverted or has been separated from its packaging. At the time of reporting, the generator is estimated to contain 89.43 mCi of Sr-82 and 76.55 mCi of Sr-85."

IL Event #: IL250049

* * * UPDATE ON 12/11/2025 AT 1503 EST FROM GARY FORSEE TO JORDAN WINGATE * * *

"The Agency was notified December 10, 2025, that the package was located and is being returned to the manufacturer. This matter is considered closed."

Notified R1DO (Warnek), NMSS Events Notifications (email), ILTAB (email), and R3DO (Nguyen)

THIS MATERIAL EVENT CONTAINS A 'Less than Cat 3' LEVEL OF RADIOACTIVE MATERIAL

Sources that are "Less than IAEA Category 3 sources," are either sources that are very unlikely to cause permanent injury to individuals or contain a very small amount of radioactive material that would not cause any permanent injury. Some of these sources, such as moisture density gauges or thickness gauges that are Category 4, the amount of unshielded radioactive material, if not safely managed or securely protected, could possibly - although it is unlikely - temporarily injure someone who handled it or were otherwise in contact with it, or who were close to it for a period of many weeks. For additional information go to http://www-pub.iaea.org/MTCD/publications/PDF/Pub1227_web.pdf

AGREEMENT STATE REPORT - FOUND ORPHAN SOURCE

The following information was provided by the Illinois Emergency Management Agency (the Agency) via phone and email:

"The Division of Radioactive Materials was notified on December 9, 2025, that an Alnor Instruments dew point measurement device, containing a radium-226 source, was located at a metal recycling facility in Bellwood, IL. The instrument was recovered by Agency staff. There was no indication of removable contamination. The device contains a 7 microcurie radium-226 foil that was manufactured and distributed under an Illinois-specific license that has since been terminated. An authorized service provider (DewPointer) was previously licensed and maintained the sealed source and device registry sheet but has since terminated operations. Labeling and serial numbers were damaged to the point that the prior owner will be unable to be determined. No public exposures in excess of regulatory limits are anticipated as a result of this incident. This device will be incorporated in the Agency's orphan source recovery program and properly disposed of as low level radioactive waste. This matter is considered closed."

Illinois item number: IL250050

* * * UPDATE ON 12/12/2025 AT 15:18 EST FROM GARY FORSEE TO KAREN COTTON * * *

The following information was provided by the Illinois Emergency Management Agency (the Agency) via email:

"Upon investigation, three additional Alnor dew point measurement devices were identified and surrendered to the Agency for disposal as low level radioactive waste. Device serial numbers will be researched to identify the owners and appropriate enforcement/cost recovery [actions will be] initiated where possible."

Notified (email) R3DO (Nguyen), NMSS Events Notification.

THIS MATERIAL EVENT CONTAINS A 'Less than Cat 3' LEVEL OF RADIOACTIVE MATERIAL

Sources that are "Less than IAEA Category 3 sources," are either sources that are very unlikely to cause permanent injury to individuals or contain a very small amount of radioactive material that would not cause any permanent injury. Some of these sources, such as moisture density gauges or thickness gauges that are Category 4, the amount of unshielded radioactive material, if not safely managed or securely protected, could possibly - although it is unlikely - temporarily injure someone who handled it or were otherwise in contact with it, or who were close to it for a period of many weeks. For additional information go to http://www-pub.iaea.org/MTCD/publications/PDF/Pub1227_web.pdf