Event Notification Report for February 19, 2025

AGREEMENT STATE REPORT - LOST STATIC ELIMINATOR

The following report was received via phone and email from the Texas Department of State Health Services (the Department):

"On February 11, 2025, the Department received a notification from the licensee of a lost general licensed device. The device, a P-2021-5432 static eliminator containing a 10 mCi (original activity from May 2023) Po-210 (Polonium) source, was used in a controlled cleanroom environment as an ion gun for removing micro-particles from semiconductor machine components. The licensee stated the device was erroneously disposed of by a facilities technician during a preventative maintenance exercise on cleanroom air guns conducted on December 2, 2024. The licensee stated that to prevent a future recurrence of this incident, all facilities technicians have been trained on the proper identification, restrictions, and regulatory disposal requirements of these devices.

"Additional Information will be provided in accordance with SA 300 Requirements"

Texas Incident Number: 10167
Texas NMED Number: TX250009

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 - STUCK OPEN SHUTTER

The following information was received from the Minnesota Department of Health, Radioactive Materials Unit via email:

"During the licensee's semi-annual wipe and shutter check for their fixed gauges, the licensee identified a radiation source with a shutter that is stuck in the [open] position. The device is a Vega/Omart SHF1-45 containing 2 mCi of Cs-137. The gauge is not readily accessible."

Minnesota Event Report ID number: MN250001

TECHNICAL SPECIFICATION DEVIATION

The following is a summary of information obtained from the licensee by phone:

On February 13, 2025, at 1009 EST, the licensee violated Technical Specification 3.2.3 when conducting a $2.00 reactor pulse while one of the required reactor power measurement channels was in bypass, therefore, the pulse power was not recorded. The pulse was completed per procedure, and the reactor was shutdown and secured. The incident was reported to supervision, and the pulse data was reviewed. The peak observed temperature during the pulse aligned with the expected peak temperature for the conducted pulse, but the peak power was not captured by the system. After review of the data, continued operation was authorized. There is no assessed safety impact due to this event.

Training will be conducted to clarify the Technical Specification requirements to prevent this issue in the future.

NRC Project Managers have been notified.

LOSS OF COMMUNICATION CAPABILITY

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

"At approximately 2320 EST on 02/17/2025, it was discovered that external network access was unavailable, to include access to DEENS (Dominion Energy Emergency Notification System) rendering the system non-functional. Subsequently, the backup method for activating the station ERO (Emergency Response Organization) was attempted and was unable to be verified. Therefore, neither the primary nor backup methods for activating the site ERO were available. Corporate IT has been notified and is investigating. [Control room staff] contacted the North Anna Power Station and verified similar issues with DEENS availability and backup ERO activation.

"On 02/18/2025, at 0403, an additional backup ERO activation phone number was provided [and documented in a standing order] in the event that the backup number listed in attachment 7 of EP-AA-CSD-201 (Notifications and Communications) is not available.

"This event is reportable in accordance with 10CFR50.72(b)(3)(xiii), any event that results in a major loss of offsite communications capability.

"The external network access and DEENS were restored on 02/18/2025 at 0725.

"The NRC Resident Inspector has been notified."

LOSS OF COMMUNICATION CAPABILITY

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

"At 0005 EST on February 18, 2025, the operations staff identified network issues. At 0014, Surry operations staff contacted the North Anna Power Station (NAPS) Shift Technical Advisor (STA) to inform NAPS that they had lost Dominion Energy
Emergency Notification System (DEENS) capability and could not utilize the backup Emergency Response Organization (ERO) activation phone number. NAPS operations staff then confirmed that they had also lost DEENS and the ability to activate the ERO with the backup phone number. At 0400, NAPS was provided an additional phone number that can be utilized to have an Everbridge operator activate the ERO remotely. Corporate IT has been notified and is investigating.

"The loss of ERO activation capability is reportable per 10 CFR 50.72 (b)(3)(xiii), any event that results in a major loss of offsite communications capability.

"The external network access and DEENS were restored at 0720 on February 18, 2025.

"The NRC Resident Inspector has been notified."

LOSS OF COMMUNICATION CAPABILITY

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

"At 0234 EST on February 18, 2025, VC Summer (VCS) was notified by Dominion Energy IT that VCS had lost Dominion Energy Emergency Notification System (DEENS) capability. VCS confirmed that they had lost DEENS and the ability to activate the ERO (Emergency Response Organization) with the backup phone number. At approximately 0705, DEENS communication functionality was restored and is currently available for use.

"The loss of ERO activation capability is reportable per 10 CFR 50.72(b)(3)(xiii), any event that results in a major loss of offsite communications capability.

"The NRC Senior Resident Inspector has been notified."

LOSS OF COMMUNICATION CAPABILITY

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

"At approximately 0230 EST on 2/18/2025, it was determined that the primary and backup methods of activating the site Emergency Response Organization (ERO) were not available. External network access was unavailable, to include access to the Dominion Energy Emergency Notification System (DEENS) rendering the system non-functional. Subsequently, the backup method for activating the station ERO was attempted and was unable to be verified.

"On 2/18/2025, at approximately 0400, an additional backup ERO activation phone number was provided and verified to be functional. At approximately 0740 on 2/18/2025, external network access was restored and DEENS was restored to functional.

"This condition is being reported pursuant to 10 CFR 50.72(b)(3)(xiii).

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