Event Notification Report for April 01, 2026

AGREEMENT STATE REPORT - LOST SOURCE

The following information was provided by the Iowa Department of Health and Human Services (the Department) via phone and email:

"On March 25, 2026, the licensee informed the Department of a possible reportable event. It is reportable as per 10 CFR 20.2201(a)(1)(i) (greater than 1,000 times the quantity specified in Part 20 Appendix C; Co-60 = 1 microcurie).

"The service provider (Berthold) came on site to retrieve the third Co-60 source from inside the dip tube that had come detached from the rod and cable. Upon surveying the tube, no source was detected. Upon sending a camera into the tube, no source was detected.

"At the time of the notification to the Department, the investigation is still ongoing.

"The Department will be discussing next steps on Thursday, March 26.

"Source: Co-60
"Serial number: 80115
"Calculated activity based off activity at installation: 27.6 mCi (27600 microcuries)"

Iowa event report ID number: IA260002

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

LOSS OF SEISMIC MONITORING

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

"At 0750 EDT on March 31, 2026, the Vogtle 1 and 2 seismic monitoring panel was discovered [to be] nonfunctional while performing operator rounds in the control room. Compensatory measures for seismic event classification have been implemented in accordance with Vogtle procedures.

"This is an eight-hour, non-emergency notification for a loss of emergency assessment capability. This event is reportable in accordance with 10 CFR 50.72(b)(3)(xiii) because the seismic monitoring panel is the method for evaluating that an operational basis earthquake (OBE) threshold has been exceeded following a seismic event. This is in accordance with initiating condition `seismic event greater than OBE levels' and emergency action level HU2.

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