Event Notification Report for October 17, 2025

EN Revision Imported Date: 10/17/2025

EN Revision Text: AGREEMENT STATE REPORT - LOST EXIT SIGN

The following information was provided by the New York State Department of Health (NYSDOH) via email:

"NYSDOH received a phone call from the general manager of AMC Theatres 8, to report a missing tritium exit sign. The device was no longer functioning and was removed for replacement on or about December 4, 2024. The sign was set aside for pick up by the contractor. On February 10, 2025, at approximately 1100 EST, the general manager discovered the sign was missing. The make/model/serial number of the sign is unknown. However, the theater is attempting to gather additional information.

"No further information on the device, source, or incident is available at this time.

"It is suspected that the tritium exit sign may have been disposed of in the regular trash, but AMC Theatres is investigating the potential whereabouts and causes for this lost device. It is not believed that the tritium exit sign is damaged and/or leaking and it is not believed that this event led to any exposure or dose to members of the public.

"Given the normal activity of these devices and the 12.3-year half-life, it is suspected that the quantity of H3 exceeds the reportability threshold required by 10 CFR 20.2201(a)(1)(i).

"NYSDOH is monitoring this event and has assigned NYSDOH Incident No. 1515 to internally track this event."

Event Report ID No.: NY-25-02

* * * UPDATE ON 10/16/2025 AT 1018 EDT FROM NATHAN KISHBAUGH TO ERNEST WEST * * *

"NYSDOH was monitoring this event and assigned NYSDOH Incident number 1515 to internally track the event. Following the original notification of this event, a report was requested and received from the general manager. The theater staff searched for the missing exit sign, but exit sign was not found. As a corrective action, should the situation arise in the future, where any exit signs are removed and stored on site, the general manager will secure the items in his personal office. The general manager was notified in writing that should the exit sign be located; our office must be notified. Subsequently, Incident number 1515 has been closed. Should this device be located/found, the licensee has been instructed to notify NYSDOH and this incident will be reopened and updated. The licensee has been made aware of the notification requirements in 10 CFR 20.2201(d)."

Notified R1DO (Young), NMSS Events Notification (Email), ILTAB (Email), and CNSC (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

AGREEMENT STATE REPORT - GAUGE SHUTTER FAILURE

The following information was provided by the Texas Department of State Health Services (the Agency) via phone and email:

"On October 10, 2025, the Agency received a notification from the licensee regarding a failure of the shutter mechanism on a level measurement gauge. The gauge is a Vega Americas SHRM-B model, containing a 300 millicurie cesium-137 sealed source. The licensee stated that the roll pin, which attaches the shutter handle to the shutter shaft, had detached, resulting in the separation of the handle from the shaft. The shutter shaft connects the handle to the shutter allowing it to be opened or closed. The shutter is currently stuck in the open position, which is the normal operating position. The licensee stated that there is no risk of additional radiation exposure to members of the public or radiation workers due to this mechanism failure. The licensee has notified a licensed service provider to repair the unit. Additional information will be provided in accordance with SA-300 reporting requirements."

Texas Incident #: 10237
Texas NMED #: TX250054

AGREEMENT STATE REPORT - GAUGE SHUTTER FAILURE

The following information was provided by the Minnesota Department of Health (MDH) via email:

"The radiation safety officer (RSO) was attempting to lock-out an Ohmart, Cs-137 fixed gauge when they found that the shutter was stuck open. The RSO stated that while trying to close the shutter, they chipped it. At that point, they removed the gauge and attempted to close the shutter in their workshop and were still unsuccessful. The RSO stated that, during continued attempts to close the shutter, they further damaged the shutter. At this point, the RSO fixed a 6-inch steel plate over the beam and put the device in storage. The RSO took surveys and determined the source was adequately shielded. The device will remain in storage, and the gauge manufacturer will be consulted for next steps.

"The RSO reported the event to MDH at approximately 1200 CDT on October 9, 2025."

Manufacturer: Ohmart
Model: unknown at this time
Source: Cs-137
Activity: approximately 80 millicuries

Minnesota Event ID: MN250007

AGREEMENT STATE REPORT - STUCK OPEN GAUGE SHUTTER

The following information was provided by the Texas Department of State Health Services (the Agency) via email:

"On October 10, 2025, the Agency received a notification from the licensee regarding a failure of the shutter mechanism on a fixed nuclear gauge. The gauge, a Ronan model SA1, contains a 10 millicurie cesium-137 sealed source. The licensee made the discovery on October 9, 2025. The shutter is stuck in the open position, which is the normal operating position. The licensee stated that there is no risk of additional radiation exposure to members of the public or radiation workers due to this mechanism failure. The licensee has notified a licensed service provider to repair the unit.

"Additional information will be provided in accordance with SA-300 reporting requirements."

TX Incident Number: 10238
TX NMED Number: TX250055

AGREEMENT STATE REPORT - LOST CALIBRATION SOURCE

The following information is a summary provided by the Georgia Radioactive Materials Program via email:

On October 10, 2025, the licensee's radiation safety officer (RSO) noticed a missing calibration source from April 1, 2024, while reviewing sealed source inventory documents. The source had been marked absent, and the former RSO had initiated an investigation but did not leave any documents to address the whereabouts of the source. The RSO reported that they did have a disposal company to exchange and dispose of several sources during that time, however, there is no evidence the source in question was disposed of. Although the RSO is confident the source was disposed, they do not have the documents and do not believe they will be able to find them. The licensee was advised to reach out to the disposal company and inquire if they could account for the source. More information will be provided as it becomes available.

Missing source: 12 mCi, Cs-137, serial number 1104-30

Georgia Incident Number: 108
NMED Number: 2025-10-10

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: 10/17/2025

EN Revision Text: NOTIFICATION OF UNUSUAL EVENT

The following information was provided by the licensee via phone:

An Unusual Event was declared on October 13, 2025, at 1914 CDT under EAL HU1.1 due to notification of a credible security threat.

State and local agencies were notified. The NRC Resident Inspector was notified.

Notified DHS SWO, FEMA Operations Center, CISA Central Watch Officer, FEMA NWC, DHS Nuclear (email), CWMD Watch Desk (email)

* * * UPDATE ON 10/13/2025 AT 2315 EDT FROM VERONICA ROHAN TO ADAM KOZIOL * * *

The Unusual Event was terminated on October 13, 2025, at 2148 CDT.

Notified R4RA (Monninger), NRR (Bowman), NSIR (Williams), R4DO (Miller), NRR EO (Mckenna), IR MOC (Grant), PAO (Gasperson).

Notified DHS SWO, FEMA Operations Center, CISA Central Watch Officer, FEMA NWC, DHS Nuclear (email), CWMD Watch Desk (email)

PART 21 - POWER DRIVEN POTENTIOMETER WITH LOOSE RELAY SOCKETS

The following is a summary of information provided by Engine Systems Inc. (ESI) via email:

Relay sockets used to retain relays 'K1' and 'K2' on a power driven potentiometer (PDP), part number: ESI 50258, were found to have low retention force. Without both relays installed, the raise and lower function of the PDP is inoperable, thus preventing adjustment of the generator output voltage.

There is a scenario where if the PDP is adjusted to a value other than the normal voltage setpoint and if the K1 or K2 relays were to dislodge during a subsequent emergency event, the PDP would not return to its preposition setpoint and therefore the generator terminal voltage would not return to its desired voltage setpoint, in which case the ability of the emergency diesel generator to carry its safety-related loads could be impacted


Affected Plants
Region 3: Prairie Island

ESI contact information:

Dan Roberts
Quality Manager
Engine Systems Inc
175 Freight Rd 175
Rocky Mount, NC 27804

CONCURRENT REPORT

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

"A 24-hour report was made to New Mexico Environment Department in accordance with discharge permit condition 30 and New Mexico Administrative Code (NMAC) 20.6.2.1203 on 10/15/2025 for an unauthorized discharge. This is a concurrent report in accordance with 10 CFR 70 Appendix A(c). On 10/14/2025, work to empty laboratory rinse water into an approved discharge route commenced in accordance with procedure. This routes the rinse water to a lined retention pond, as approved in Urenco USA's discharge permit. During transfer of the rinse water, it was identified that the rinse water was not being put into the intended location. It was determined that it was being put into a cement vault for a domestic water flowmeter. The contents of the tote are approximately 330 gallons of rinse waster from non-radiological labware for reagent preparation from the chemistry laboratory, containing primarily deionized water with dilute acids, detergents, and neutralized with sodium bicarbonate. It was analyzed to be within allowable limits for uranium concentration and pH in accordance with the discharge permit and NMAC 20.6.2.3103, prior to removal from the laboratory. This event has been put into the corrective action program and corrective actions are ongoing."