Event Notification Report for July 26, 2024

EN Revision Imported Date: 7/29/2024

EN Revision Text: ALERT DECLARATION DUE TO SEISMIC ACTIVITY FELT ON SITE

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

"On July 26, 2024, at 0844 MDT, Urenco (Louisiana Energy Services) declared an Alert following a magnitude 5.0 earthquake in Snyder, Texas, which was felt onsite. No release on site was detected."

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

The earthquake was felt from within the Urenco control room. Three centrifuges were taken out of service due to the seismic event, however, there were no leaks found on the equipment. No public protective actions are recommended at this time.

The licensee notified State and local authorities.

Notified DHS SWO, FEMA Ops Center, USDA Ops Center, HHS Ops Center, DOE Ops Center, CISA Central Watch Officer, EPA EOC, FDA EOC (email), FEMA NWC (email), DHS Nuclear SSA (email), DHS NRCC (email), FEMA NRCC SASC (email), FERC (email)

* * * UPDATE ON 07/26/2024 AT 1430 MDT FROM TYLER ROBINSON TO IAN HOWARD * * *

On 7/26/2024, at 1430 MDT, Urenco USA terminated the Alert. Urenco USA met conditions for event termination. No damage was found upon completion of site walkdowns and seismic aftershock magnitude continues to decrease. The licensee will notify State and local authorities.

Notified DHS SWO, FEMA Ops Center, USDA Ops Center, HHS Ops Center, DOE Ops Center, CISA Central Watch Officer, EPA EOC, FDA EOC (email), FEMA NWC (email), DHS Nuclear SSA (email), DHS NRCC (email), FEMA NRCC SASC (email), FERC (email), R2DO (Coovert), IR MOC (Crouch), NMSS (Helton)

EN Revision Imported Date: 7/29/2024

EN Revision Text: NON-POWER REACTOR - UNPLANNED HIGH POWER TRIP

The following information was summarized from the licensee via phone and email:

At the time of the trip, the reactor was being operated by an authorized operator trainee under direct supervision of a reactor operator with a senior reactor operator present. The reactor was at a steady state power of 5 watts as planned by the supervisor. The reactor tripped unplanned as a result of high power trip signal. The trip was uncomplicated, the event was not an emergency, and involved no damage to the facility. The reactor is shut down and secured at this time.

The safety channels of the AGN-201M are set to operate near 120 percent of the licensed power limit of 6 watts. The high-power trip observed today was unplanned but does not appear to have occurred because of an actual exceedance of the trip setpoints on the redundant safety channels, or the licensed power limit. Both trip setpoints and safety channels were measured during monthly surveillances on 7/23/24, and were within the normal and expected range.

In the past, there have been protection system trips caused by static electrical discharge from the operator to the console however the cause of the trip is still under investigation.

Monthly surveillances relating to the safety channels are planned to be repeated to verify that they are operating in the normal range before resuming reactor operations.

The University of New Mexico is making this notification to the NRC in accordance with technical specification '6.9.2.a.7', which requires notification for unplanned events causing a reactor shutdown (i.e. high-power trip).

AGREEMENT STATE REPORT - LOST SOURCE

The following information was provided by the Virginia Radioactive Materials Program (the Department) via email:

"On July 26, 2024, at approximately 1440 EDT, the VDH [Virginia Department of Health] Office of Radiological Health was contacted by the radiation safety officer (by phone) from Molecular Imaging Services, Inc. to report a missing Co-57 reference source of 5.257 mCi. On July 25, the licensee discovered that a package that had contained the source was delivered on July 3, and was inadvertently disposed of in the trash. It was not known by the nuclear medicine staff until July 25, that the source had been delivered on July 3 and that their investigation determined that the unopened package was placed in the dumpster by the facility janitor. The licensee has confirmed that the dumpster was picked up on July 6 and has been disposed of in the Prince William County Sanitary Landfill.

"The Department will follow up with an investigation."

Virginia Event Report ID No.: VA240003

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 - DOSE TO UNINTENDED ORGAN

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

"University of California at Los Angeles (UCLA) reported a medical event had occurred on Friday, July 26, 2024, during a Y-90 Therasphere liver cancer treatment. Patient SPECT imaging performed on August 1, 2024, showed that all of the Y-90 activity was in the patient's stomach tissue rather than in the intended left lobe of the liver. The licensee reported that the dosage of Y-90 administered was in conformance with the written directive. UCLA is continuing to investigate to determine how the Y-90 Theraspheres ended up in the stomach tissue and will address the cause in their 15-day written report to the Radiologic Health Branch.

"Per the licensee's documentation, a dosage of 0.77 GBq was delivered to the patient, with 0.74 GBq expected to go to the treatment site to result in a dose of 178.9 Gy to the treatment site."

California event number: 5010-080124

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 - LOST ION MOBILITY SPECTROMETRY CELL

The following information was provided by the Colorado Department of Public Health and Environment via email:

"On August 16, 2024, the radiation safety officer at Particle Measuring Systems, Inc. notified the Colorado Department of Public Health and Environment via email that an ion mobility spectrometry cell containing a 10 mCi nickel-63 source was discovered to be missing during the licensee's six-month inventory. The inventory was conducted on July 26, 2024, but the actual date of loss is unknown. The licensee believes that a transactional error occurred in their inventory as opposed to an actual loss, but does not have data to prove that a source was not lost."

Colorado event report ID number: CO 240021

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