Event Notification Report for March 13, 2025

AGREEMENT STATE REPORT - LOST TRITIUM EXIT SIGN

The following information was provided by the California Department of Public Health via email:

"On Monday, March 17, 2025, the California State University - Long Beach alternate radiation safety officer reported the loss of one tritium exit sign from their campus' Carpenter Performing Art Center. This exit sign was an Isolite tritium exit sign, made on April 5th, 2015, Model 2000, S/N H50630, with an initial tritium activity of 0.281 TBq (7.6 Ci). The exit sign was officially declared lost on March 14, 2025, after a thorough search by campus environmental health and safety personnel could not locate the exit sign. A contamination survey of the exit sign's designated location did not show the presence of tritium contamination. The licensee will continue to look for the exit sign and provide additional information when available. Corrective actions included refresher training, increased physical inventories of all campus tritium exit signs, and review of methods of securing of exit signs to mounting surfaces."

California 5010 number: 031725

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 - MEDICAL EVENT

The following information was provided by the New Mexico Environment Department, Radiation Control Bureau via email:

"The New Mexico Environment Department, Radiation Control Bureau was informed of a medical event at approximately 1605 MDT on Friday, March 14, 2025.

"Incident date: March 4, 2025. Discovery date: March 14, 2025.

"Lovelace Medical Center, license number (MI210)
"Prescribed Activity: 0.5 GBq
"Delivered Activity: 0.4 GBq
"Percent Delivered: -20 percent
"Possible cause: low dose prescribed and/or possible issues with the catheter.

"The facility stated they are working on the 15-day report."

A Medical Event may indicate potential problems in a medical facility's use of radioactive materials. It does not necessarily result in harm to the patient.

AGREEMENT STATE REPORT - CRIMPED SOURCE GUIDE TUBE

The following information was provided by the California Department of Public Health, Radiologic Health Branch via email:

"A reciprocity licensee, Stronghold Inspection (TX license number L06918), was conducting industrial radiography at a laydown yard located on the Martinez Refining Company site (RML #3590). At about 0200 PDT, a pipe that was being radiographed rolled onto the guide tube of the exposure device (QSA Global 880 Delta, s/n D17238), crimping the guide tube and preventing the 2.73 TBq Ir-192 sealed source (QSA Model 8424-9, s/n 12805P) from retracting into its shielded position. The licensee reports that a perimeter spanning about 200 feet in radius was established. The exposure rate at the perimeter is less than 2 mR/hr and is under constant surveillance. The source is currently located in the collimator at the end of the guide tube. The licensee has requested the assistance of QSA's source retrieval team. Source retrieval is scheduled to begin upon arrival at approximately 1800 PDT. RHB inspectors arrived onsite at about 1000 PDT and will observe the operations until the source has been secured."

California 5010 number: 031425

60-DAY OPTIONAL TELEPHONIC NOTIFICATION FOR AN INVALID CONTAINMENT ISOLATION

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

"On March 14, 2025, at 1523 EST, while Unit 1 was operating at 99.5 percent power in mode 1, the unit experienced a loss of the 24/48V DC bus (division 2) due to a failed battery charger. The 24/48V DC bus was restored by installing a temporary charger.

"This event is reportable per 10 CFR 50.73(a)(2)(iv)(A) because it was not part of a pre-planned sequence and resulted in the invalid, partial actuation of containment isolation valves (CIVs) in both the primary containment and secondary containment systems, with all systems responding normally.

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

AGREEMENT STATE REPORT - UNABLE TO RETRACT SOURCE

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

"On March 13, 2025, during a radiography exposure, the radiography crew noted that too much drive cable extended into the guide tube. The radiographer cranked in to investigate and was unable to return the source to the exposure device. The radiation safety officer (RSO) was notified, and the crew began expanding their boundaries. The RSO initiated source retrieval operations. After shielding the source with lead shot, and performing some tests, it was determined that the source had not disconnected and that the guide tube was not attached to the camera. The RSO then `jiggled the drive cable' and was able to crank the source back into the shielded position. The RSO estimates that the source was exposed for less than 1 hour.

"After investigation, the RSO determined that the guide tube was never properly secured to the quick connect at the end of the exposure device. Cranking the source out to the end of the guide tube disconnected the guide tube from the exposure device. When retracting the source, the source pigtail caught on the quick connect port on the end of the exposure device due to the weight of the guide tube on the drive cable. To determine if the source was still connected, the RSO pulled on the controls and thus the drive cable and pig tail were pulled out of the guide tube. With the weight of the guide tube now off of the drive cable, the RSO was able to jiggle the controls and dislodge the pigtail from the quick connect at the end of the exposure device and retract the source completely.

"MDH was notified of the event on March 18, 2025, at approximately 1350 [CDT]. MDH is considering enforcement action due to the late notification of the event. An on-site investigation is planned for March 20, 2025.

"The device is a Source Production and Equipment Company (SPEC) model 150 radiography camera."

Minnesota Event Report ID: MN250002

AUTOMATIC ACTUATION OF '4B' EMERGENCY DIESEL GENERATOR

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

"At 1847 EDT on 3/13/25, with Unit 4 in mode 6 and defueled, an actuation of the 4B emergency diesel generator (EDG) occurred when the Unit 4 startup transformer '4B' 4kV Bus Supply Breaker '4AB05' tripped open. The '4B' EDG automatically started and energized the '4B' 4kV Bus as designed when the undervoltage condition caused the '4B' sequencer loss of offsite power signal to be received.

"This event is being reported pursuant to 10 CFR 50.72(b)(3)(iv)(A).

"The NRC Resident Inspector has been notified."

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

All systems responded as expected for the loss of voltage. There was no impact to the health and safety of the public or plant personnel. The cause of the breaker opening is under investigation. Power remains available to the '4B' 4kV Bus via both the '4B' EDG and the station blackout tie bus.

FITNESS FOR DUTY

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

A licensed employee had a confirmed positive test for alcohol during a test specified by the FFD testing program. The employee's access to the site has been terminated.

The NRC Resident Inspector has been notified.

FITNESS FOR DUTY

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

A licensed employee violated the FFD policy. The employee's access to the plant has been terminated.

The NRC Resident Inspector has been notified.

EN Revision Imported Date: 3/17/2025

EN Revision Text: UNUSUAL EVENT - LOSS OF OFFSITE POWER

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

"At 1902 EDT on 3/13/2025 Turkey Point Nuclear Plant Unit 4 declared an Unusual Event due to a loss of offsite power [to the '4B' 4KV bus]. The '4B' 4KV bus was re-energized from the '4B' emergency diesel generator (EDG). The '4A' 4KV bus is de-energized as part of the pre-planned outage scope. The cause of the loss of Unit 4 startup transformer is not known at this time. All plant parameters are stable."

State and local agencies were notified. The NRC resident inspector has been notified.

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

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

The licensee is evaluating the startup transformer before transferring the '4B' 4KV bus back to offsite power. Spent fuel pool cooling remained in-service as it was powered from Unit 3. Unit 3 was unaffected and remains at 100 percent power.

* * * UPDATE ON 03/13/2025 AT 2318 EDT FROM DANIEL BITTNER TO KERBY SCALES * * *

"At 2056 EDT on 3/13/2025, Turkey Point Nuclear Station Unit 4 terminated the Unusual Event due to a loss of offsite power. The event was terminated due to more than one emergency power source being available; `4B' emergency diesel generator and `4D' bus station blackout tie."

Notified R2DO (Pearson), DHS SWO, FEMA Operations Center, CISA Central Watch Officer, FEMA NWC, DHS Nuclear SSA (email), CWMD Watch Desk (email).

* * * RETRACTION ON 03/14/2025 AT 0518 EDT FROM DANIEL BITTNER TO JORDAN WINGATE * * *

"Turkey Point Nuclear Station Unit 4 is retracting this notification based on additional information not immediately identified at the time of notification. Following the loss of the '4B' 4kV bus event on 3/13/25, the emergency action level (EAL) technical bases document for CU2.1 was reviewed and identified that more than one emergency power source was still available at the time of the event and could have been credited. Specifically, the '4B' EDG and the '4D' bus station blackout cross tie (powered by Unit 3) emergency power sources were still available. The initial report was based on the available information at the time pursuant to emergency declaration and reporting notification requirements.

"The NRC Resident has been notified."

Notified R2DO (Pearson), Region 2 RA (Miller), NRR (Bowman). IR MOC (Crouch), Region 2 PAO (Gasperson), NRR EO (Felts), and NSIR (Erlanger)