Event Notification Report for December 16, 2022

AGREEMENT STATE REPORT - UNABLE TO RETRACT SOURCE

The following information was provided by the Texas Department of State Health Services (the Department) via email:

"On December 16, 2022, the Department received calls from a licensee reporting an equipment failure with a moisture density gauge. The licensee has been unable to retract the rod with cesium-137 back to the fully shielded position and the source is sticking out about 4 inches. This is for a Humboldt 5001 gauge with 40 millicuries (mCi) of americium [-241] and 10 mCi of cesium-137. The rod is presently in the ground to maintain shielding and will be transported back to the storage site with the rod in a bucket of sand. The licensee plans to transport the gauge the same way to a repair facility tomorrow morning. The dose to personnel has not been above normal working conditions but there may be some dose during transportation. The licensee was reminded to minimize dose as much as possible. Further information will be provided per SA-300."

Texas Incident Number: 9974

ALERT - SEISMIC EVENT FELT ONSITE

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

"An Alert has been declared at Urenco USA. An Alert is the official designation for an emergency which is contained on the URENCO USA site. No public protective actions are recommended at this time. A seismic event was detected near the facility. A release of hazardous material has not occurred."

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

On 12/16/2022 at 1645 MST, Urenco USA declared an Alert due to seismic event felt onsite. The Headquarters Operations Officer was notified of the Alert at 1916 EST (1716 MST). No radioactive release has occurred. A 5.4 magnitude earthquake occurred in western Texas with an epicenter 20 km north-northwest of Midland, Texas. Plant personnel are conducting walkdowns of the site.

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 12/17/2022 AT 1400 MST FROM DANEIL MOLINAR TO BRIAN LIN* * *

On 12/17/2022 at 1400 MST, Urenco USA terminated the Alert due to a seismic event felt onsite. Urenco USA met conditions for event termination. No damages were found upon completion of site walkdowns. The licensee has 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), R2DO (Miller), IR (Ulses), NMSS (Helton)

MANUAL REACTOR SCRAM

The following information was provided by the licensee via email:

"On December 16, 2022 at 2351 CST, with the Unit in Mode 1 at 13 percent power, a manual scram was inserted due to lowering Reactor Pressure Vessel (RPV) pressure, which occurred following an unexpected opening of Main Turbine Bypass Valve 1. All control rods fully inserted. Following actuation of the manual scram, RPV pressure lowered, resulting in an automatic Primary Containment lsolation (PCIS) Group 1 isolation (expected response). The main steam isolation valves and steam line drain valves all closed. The Group 1 [isolation] has been reset allowing RPV pressure control with steam line drains to the main condenser.

"All systems responded as designed. The plant is stable in Mode 3. Investigation of the bypass valve opening is ongoing.

"This event is reportable under 10 CFR 50.72(b)(2)(iv)(B) RPS Actuation and 50.72(b)(3)(iv)(A) Specified System Actuation.

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

AGREEMENT STATE REPORT - LOST SOURCE

The following information was received from the Minnesota Department [the Department] of Health via email:

"The Department was notified on January 13, 2023, of a lost 1.59 GBq (43 mCi) W-181 [tungsten-181] source in a Check-Cap C-scan colorectal cancer screening device. The Check-Cap C-scan was administered to a patient with the expectation the patient would recover the device at home when it exited the body. The device was not recovered and instead flushed down the toilet at the patient's residence."

Minnesota Event Number: MN230001

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