Event Notification Report for October 24, 2025

EN Revision Imported Date: 10/24/2025

EN Revision Text: AGREEMENT STATE REPORT - STUCK OPEN GAUGE SHUTTER

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

"At 1725 CDT on 4/1/2025, Suzano Packaging notified the Department by email that the rotor pin for the shutter in one of their process gauges on digester #8 was sheared. The discovery was made while attempting to lock out the gauge for process maintenance.

"The affected gauge is as follows:

"OHMART-03240310036 SR2, SN-4731C0, Cs-137, 1000 microcuries.

"Licensee actions are as follows:

"A technical representative from BBP Sales [LLC, a dealer and servicer of OHMART Vega Corporation Scientific Instruments] determined on 4/1/2025 that the gauge cannot be repaired in place and steps have been implemented to acquire a replacement gauge.

"The process continues to run safely, with no additional exposure to workers, but with confined space entry being prohibited.

"Digester #8 remains in service with the affected gauge performing measurements as required.

"Upon receipt of the replacement gauge, maintenance will be scheduled with BBP Sales technical support to safely remove the affected process gauge from service and replace it with the new unit.

"The investigation is ongoing, and reporting will proceed in accordance with SA-300."

Arkansas Event Number: AR-2025-001

* * * UPDATE ON 10/23/2025 AT 1140 EDT FROM DAVID EICHENBERGER TO IAN HOWARD * * *

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

"The root cause of the event appears to be scaffolding that was erected too close to the gauge preventing proper operation and damaging the shutter mechanism.

"The gauge was replaced on July 29, 2025, and the old gauge was shipped for disposal on August 18, 2025."

Notified R4DO (Vossmar), NMSS Events Notifications Group (email).

AGREEMENT STATE REPORT - LEAKING SOURCE

The following information was provided by the Georgia Radioactive Material Program (the Department) via email:

"On October 8, 2025, a leaking source was discovered while performing a routine leak test. The leak test revealed more than 0.005 mCi of removable contamination of Cs-137. The definitive cause of the leakage was not determined; however, cracks in the source were noticed through visible inspection. The leaking source was placed in a lead pig. The pig and cleanup waste were placed in a double bagged plastic bag and stored behind lead bricks. Removable contamination surveys were performed at the site of the leaking source and on the hands of the physicists. All areas and personnel were found to be free of removable contamination. The licensee will contact a company for waste disposal and will notify the department when the disposal is completed. The incident was reported to our office on October 10, 2025."

GA Incident Number: 109

AGREEMENT STATE REPORT - STOLEN GAUGE

The following information was provided by the Nevada Radiation Control Program via phone and email:

"The radiation safety officer for Universal Engineering Services, [license number] 00-11-14033-01, reported to the Nevada Radiation Control Program that a portable gauge had been stolen from the back of a pick-up truck (all chains were cut) at a hotel where an employee was staying in Reno, this morning at 0815 PDT. The gauge in question is a Troxler, model 3430, serial number 37385, with americium-241/beryllium neutron sealed source with an activity of 40 mCi, and a cesium-137 sealed source with an activity of 8 mCi. The licensee is filing a report to the Reno Police Department for the stolen gauge and has been reaching out to local pawn shops.

"Notification is made under 10 CFR 20.2201(a)(1)(i)."

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 - UNPLANNED CONTAMINATION

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

"The Agency was contacted on 10/15/25 by the radiation safety officer for Elmhurst Hospital (IL-01612-01) to advise of a contamination incident. Reportedly, a vial containing 200 millicuries of Lu-177 was dropped in the facility's hot lab and contaminated a technician. Decontamination efforts are ongoing. Inspectors are headed to the facility to gather additional details and determine the likelihood of exposures exceeding regulatory limits.

"Based on the information currently available. this matter is a reportable unplanned contamination event under 32 Illinois Administrative Code 340.1220(c)(1). It is reportable within 24 hours, which the licensee met.

"Additional updates will be provided as they become available."

Illinois Reference Number: IL250044

OFFSITE NOTIFICATION

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

"On October 22, 2025, at 0452 EDT, chemistry determined that a report to the State of Michigan, Department of Environment, Great Lakes, and Energy, would be required based on exceeding the National Pollutant Discharge Elimination System permit limit for hydrazine. This exceedance did not exceed any NRC regulations or reporting criteria. This notification is being made solely as a four-hour, non-emergency notification for a notification to another government agency. This event is a 4-hour non-emergency report in accordance with 10 CFR 50.72(b)(2)(xi). There was no impact on the health and safety of the public or plant personnel.

"The NRC Resident Inspector will be notified."

MANUAL REACTOR SCRAM

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

"At 1535 CDT on 10/22/2025, with Unit 1 in mode 1 at 86 percent power, the reactor was manually tripped due to low turbine electro-hydraulic control (EHC) oil system reservoir level, caused by a leak developing in the heater bay. 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 the emergency operating procedure for reactor pressure vessel control and stabilized the plant in mode 3. Decay heat is being removed by discharging steam to the main condenser using the turbine bypass valves, which have a separate EHC oil system.

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