Event Notification Report for August 03, 2023

AGREEMENT STATE REPORT - LOST GAUGE

The following information was provided by the Colorado Department of Health (the Department) via email:

"On July 19, 2023, Geotech Environmental Equipment, Inc. informed the Department that they rented a generally licensed Viken PB200i XRF device (SN: 1015) containing a 5 millicurie, cobalt-57 sealed source to Hi-Tech Environmental located in Brooklyn, New York on July 7, 2021. Geotech Environmental Equipment, Inc. stated that as of October 25, 2022, Hi-Tech Environmental stopped replying to emails, stopped paying their rental balance, and was not providing information for returning the device. Geotech Environmental Equipment also stated that as of June 26, 2023, they made the decision to report the XRF device as a transferred device on their 2023 general radioactive material license registration inventory.

"Based on the description of the event, the device was not transferred and as of July 19, 2023 the Department has determined that Geotech Environmental Equipment, Inc. lost the generally licensed Viken PB200i XRF device (SN: 1015)."

Colorado Event Report ID Number: CO230022

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

PREPLANNED OUTAGE OF A REQUIRED SAFETY MONITORING SYSTEM

The following information was provided by the licensee via email:

"The American Centrifuge Plant (ACP) criticality accident and alarm system (CAAS) is designed to detect a nuclear criticality accident and provide audible and visual alarms that alert personnel to evacuate the immediate area, as required by 10 CFR 70.24, criticality accident requirements.

"The CAAS will be temporarily disabled (declared inoperable in accordance with approved plant procedures) to perform periodic CAAS testing activities. The planned CAAS outage is expected to last for approximately 48 hours, commencing at approximately 0800 EDT, on Wednesday, August 2, 2023. The planned maintenance activities will affect the CAAS in X-3001 North.

"Essential personnel will be present inside the controlled access area during the maintenance activities. Compensatory measures will be implemented in accordance with section 5.4.4 of the license application for the ACP. These measures include the following: evacuation of non-essential personnel from the area of concern and the immediate evacuation zone (IEZ) before removing CAAS equipment from service; limiting access into the area; restricting fissile material movement; and the use of personal alarming dosimeters for personnel that must access the area during the CAAS outage. These measures will be implemented until CAAS coverage is verified to be operational, and the CAAS is declared operable in accordance with approved plant procedures.

"American Centrifuge Operating, LLC will notify the NRC when CAAS coverage is returned to normal operation.

"The licensee has notified the NRC Project Manager."

FAILED FITNESS FOR DUTY TEST

The following information was provided by the licensee via email:

"At 1506 EDT on July 31, 2023, it was determined that a contractor supervisor failed a test specified by the fitness for duty testing program. The individual's authorization for site access has been terminated.

"The NRC Resident Inspector has been notified."

ACTIVE SEISMIC MONITORING SYSTEM INOPERABLE

The following information was provided by the licensee via email:

"On 08/01/2023 at 0955 EDT, the Fermi 2 active seismic monitoring system provided indication of a potential seismic activity event. Plant abnormal procedures were entered, and compensatory measure were met and remain in place. Neither the [United States Geological Survey] (USGS) nor the next closest nuclear power plant could confirm or validate the readings obtained at Fermi. The seismic monitoring system was declared nonfunctional to validate the calibration of the system. Femi 2 has two active seismic monitors: one on the reactor pressure vessel pedestal and one in the high-pressure core injection (HPCI) room. Only the HPCI room accelerometer was declared inoperable. The HPCI accelerometer is the sole 'trigger' for the seismic recording system, which outputs peak accelerations experienced during a seismic event. This is used in assessment of the magnitude of an earthquake for EAL HU 2.1.

"The loss of the active seismic monitoring system is reportable to the NRC within 8 hours of discovery in accordance with 10 CFR 50.72(b)(3)(xiii).

"No seismic activity has been felt onsite and the USGS recorded no seismic activity in the area.

"The NRC Resident Inspector has been notified."