Event Notification Report for August 16, 2022

AGREEMENT STATE REPORT- LOST STATIC ELIMINATOR

The following summary was received from the Colorado Department of Public Health and Environment via email:

The Colorado Department of Public Health and Environment reported one NRD, LLC static eliminator, model number P-2021, containing 0.01 Ci of Po-210 was lost by the licensee [Service King #340]. The incident occurred July 11, 2022.

CO Event Report ID no.: CO220027

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- LOST STATIC ELIMINATOR

The following summary was received from the Colorado Department of Public Health and Environment via email:

The Colorado Department of Public Health and Environment reported one NRD, LLC static eliminator, model number P-2021, containing 0.01 Ci of Po-210 was lost by the licensee [Service King #344]. The incident occurred July 11, 2022.

CO Event Report ID no.: CO220028

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

VALID ACTUATIONS OF UNIT 1 AND UNIT 3 EMERGENCY DIESEL GENERATORS AND UNIT 1 AUXILIARY FEEDWATER PUMP

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

"At 1702 MST on August 14, 2022, a start-up transformer de-energized, resulting in a loss of power to the Unit 1 Train B 4.16 kV Class 1E Bus and the Unit 3 Train A 4.16 kV Class 1E Bus. The Unit 1 Train B Emergency Diesel Generator (EDG) and Unit 3 Train A EDG automatically started and energized their respective 4.16 kV Class 1E Buses. As a result of the loss of power on the Unit 1 Train B 4.16 kV Class 1E Bus, the B Auxiliary Feedwater Pump automatically started, as expected. The B Auxiliary Feedwater Pump was not needed for steam generator level control and no auxiliary feedwater valves repositioned. The B Auxiliary Feedwater Pump did not supply feedwater to the steam generators.

"This event is being reported in accordance with 10 CFR 50.72(b)(3)(iv)(A) as an event that results in a valid actuation of emergency AC electrical power systems and an auxiliary feedwater system.

"All systems operated as expected. Per the Emergency Plan, no classification was required due to the event. The 4.16 kV Class 1E Buses in Unit 2 were not affected by the de-energization of the start-up transformer since it was not aligned as normal power for Unit 2. Units 1, 2 and 3 remain in Mode 1 at 100% power.

"The cause of the start-up transformer being de-energized is under investigation. No plant transient occurred as a result of this failure.

"The NRC Resident Inspectors have been informed."