Event Notification Report for July 21, 2025

UNANALYZED CONDITION

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

"The facility is in a safe and stable configuration and no accident has occurred.

"Urenco USA stores '1S' bottles in storage cabinets that are verified as safe-by-design, and have been analyzed for storage in the storage area as sub-critical under all normal and credible abnormal conditions. '1S' bottles were removed from cabinets and placed onto carts awaiting transfer to new approved cabinets in the cylinder receipt and dispatch building (CRDB).

"An analysis exists for this configuration of '1S' bottles on carts in other areas of the plant but does not presently exist for '1S' bottles stored on carts in the CRDB. The collection of '1S' sample bottles on several mobile carts potentially falls outside of the normal operating conditions analyzed in nuclear criticality safety and integrated safety analysis (ISA) related documentation and results in the facility being in a state that was different than analyzed in the ISA.

"Corrective actions have begun."

The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:

Personnel access to the area has been restricted pending completion of the evaluation.

The licensee has notified NRC Region 2.

AGREEMENT STATE REPORT - STUCK SOURCE

The following information was provided by the Rhode Island Department of Radiological Health via email:

"At 0006 EDT, on July 14th, 2025, an Electric Boat employee was attempting to retract an Ir-192 source of 19.5 Ci. The employee was only able to retract the source halfway back to the exposure device when the source would not move any further. The employee then cranked the source back out into the collimator to provide shielding. The employee then contacted their supervisor to report the emergency notification and follow the emergency procedures as required. The boundaries were verified to be less than 0.5 mR/hr at all boundaries. There were no un-monitored personnel in the area. Additional personnel were provided to maintain control of the area. The radiation safety officer (RSO) was contacted at 0013 and notified of the hung source. The RSO arrived on site at approximately 0043 to assess the incident and determine a corrective action on how to move forward. The RSO and the radiographer returned the radioactive source to the exposure device at approximately 0300. The highest dose received by any individual of the recovery team was 1 mrem. The source in the exposure device was secured and returned to storage."

Rhode Island Event Report ID Number: Rhode Island-25-01

OFFSITE NOTIFICATION

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

"At 1100 EDT on 07/17/2025, North Anna Power Station reported elevated levels of tritium in a ground water monitoring well to the State of Virginia as a non-voluntary reporting of tritium. An investigation is currently ongoing to identify the cause of the elevated tritium levels. The tritium levels in this location do not exceed any NRC regulations or reporting criteria.

"This notification is being made solely as a four-hour, non-emergency notification for a notification of the other government agency. This event is reportable in accordance with 10 CFR 50.72(b)(2)(xi). There is no impact on the health and safety of the public or plant personnel.

"The NRC Resident Inspector has been notified."

AGREEMENT STATE REPORT - LOST SOURCE

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

"On July 15, 2025, the Agency became aware that a generally licensed gauge containing 100 millicuries of Am-241 could not be located. The gauge, a Peco Controls Corporation Gamma 101P, (SN G011619735), was one of (8) listed in use at Teasdale Foods in Hoopeston, IL. According to the (relatively new) registrant's management, records of the device could not be found and search efforts have been unproductive. An investigation is still underway to determine the root cause and the effectiveness of corrective actions."

Sealed source information:
Serial number: 5445LA

Illinois item number: IL250027

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

SECONDARY CONTAINMENT DOOR UNSECURED

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

"On July 21, 2025, at 1548 CDT, River Bend Station (RBS) was operating at 100 percent reactor power when the central alarm station received a door alarm indicating that PW123-01 was not fully secured. A security officer was dispatched and found the door closed with the dogs (latches) not engaged. The security officer fully engaged the dogs at 1551 CDT.

"PW123-01 is a secondary containment door. With the dogs not being engaged, secondary containment was inoperable for 3 minutes.

"This event is being reported under 10 CFR 50.72(b)(3)(v) as an event or condition that could have prevented fulfillment of a safety function due to the inoperability of secondary containment.

"The NRC Resident Inspector has been notified."

The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:

The licensee entered technical specification LCO 3.6.4.1 while the door was unsecured.