Event Notification Report for December 06, 2021

EN Revision Imported Date: 12/6/2021

EN Revision Text: VALID SPECIFIED SYSTEM ACTUATIONS OF UNIT 1 AND UNIT 3 EMERGENCY DIESEL GENERATORS

"At 1446 MST on October 20, 2021, 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.

"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.

"All systems operated as expected. Per the Emergency Plan, no classification was required due to the event. Units 1 and 3 both remain in Mode 1 at 100 percent power. Unit 2 is currently in a refueling outage and defueled. 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.

"The cause of the start-up transformer being de-energized is under investigation.

"The NRC Resident Inspectors have been informed."

* * * UPDATE ON 12/3/21 AT 1652 EST FROM MATT BRADFIELD TO KERBY SCALES * * *

"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 water level control and no auxiliary feedwater valves repositioned. The B Auxiliary Feedwater Pump did not supply feedwater to the steam generators."

The NRC Resident Inspector will be notified.

Notified R4DO (Taylor).

EN Revision Imported Date: 12/6/2021

EN Revision Text: AGREEMENT STATE REPORT - BRACHYTHERAPY SOURCE POSITION ERROR

The following was received from the Virginia Department of Health, Radioactive Materials Program (the agency) via email:

"On November 24, 2021, the agency was notified by the [radiation safety officer] at the University of Virginia, by email at 1347 EST and by phone at 1355 EST, that a medical event involving an HDR [high dose rate brachytherapy] had occurred that day. During a prostate HDR Iridium-192 case, the patient was treated without any issues through the first channel. At the start of the second channel run, an error was received indicating that the source position slipped while at the 0.0 cm mark. The procedure was paused with no treatment to the patient through the second channel. A dummy wire test was run with no errors indicated. A second attempt at treatment with the source through the second channel was made and the same position error was indicated. The treatment was cancelled at that point. Having only received the first channel treatment, the patient received less than 5 percent of the total prescribed dose. The HDR unit is a Varian VariSource iX, serial number V3509. The source is an Alpha Omega Iridium-192, serial number 02-01-3798-001-191421-11617-25 with a current activity of 5.98 Ci. The licensee contacted Varian and stated that they believe it is likely an issue with the afterloader itself. The source was verified to be in the unit and no additional exposure to the patient or staff was received from the event. The licensee is working with Varian to schedule a repair visit.

"This report will be updated when the licensee submits their final investigation report."

Virginia Event Report ID No.: VA-21-0007

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.

EN Revision Imported Date: 12/6/2021

EN Revision Text: AGREEMENT STATE REPORT - LOST NI-63 SOURCE

The following information was received from the state of New Jersey Department of Environmental Protection:

"The Radiation Safety Officer of Rutgers University informed the New Jersey Department of Environmental Protection that one sealed source device, with an installed source, cannot be found and is considered lost. The source in question is a Ni-63, electron capture detector source, serial number U1739, to be used in Agilent HP Gas Chromatograph, Model # HP6890, serial number US10204036 electron capture detection device. The source contained 15 mCi of activity. The device was present during the licensee's April, 2021 inventory. When the current inventory was being conducted, the device could not be found. The licensee stated that the lab where the device was located had a burst pipe in June, 2021. It is believed that the device was mistakenly discarded in July, 2021, as part of the clean-up. Rutgers will forward a written report within 30 days."

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

EN Revision Imported Date: 12/6/2021

EN Revision Text: UNIT 1 HPCI INOPERABLE

"At 1847 CST on December 1, 2021, it was discovered that the HPCI [high pressure coolant injection] system was inoperable. Due to this inoperability, the system was in a condition that could have prevented the fulfillment of a safety function; therefore, this condition is being reported as an eight-hour, non-emergency notification per 10 CFR 50.72(b)(3)(v)(D). The Unit 1 RCIC [reactor core isolation cooling] system was Operable during this time period. There was no impact on the health and safety of the public or plant personnel. The NRC Resident has been notified."

Unit 1 HPCI operability was restored at 2110 CST.

EN Revision Imported Date: 12/6/2021

EN Revision Text: PART 21 - 15V AND 48 V POWER SUPPLY DEFECT

"This is a non-emergency notification required by 10 CFR 21.21(d)(3)(i). A written notification in accordance with 10 CFR 21.21(d)(3)(ii) will be provided in 30 days.

"On November 10, 2021, Callaway Plant received written notification from Paragon Energy Solutions, LLC, pursuant to 10 CFR 21.21(b), which identified a deviation associated with the DC/DC converter in two power supplies, NLI-STM15-15M20 (15 VDC) and NLI-STM48-14M20 (48 VDC) that had been sent to Paragon for evaluation and failure analysis following failures of individual components within the power supplies at Callaway Plant. The notification identified the following failed components:

"For the NLI-STM15-15M20 [15 VDC] power supply, the failed components were the Vicor Module, P/N: V150A28C500BL, and the DC/DC Converter, Murata P/N: NKE1212SC, Date code: G1511

"For the NLI-STM48-14M20 [48 VDC] power supply, the failed component was the DC/DC Converter, Murata P/N: NKE1212SC, Date code: G1511

"Fourteen of these power supplies (in total) are used in three Balance of Plant Engineered Safety Feature Actuation System (BOP-ESFAS) cabinets and two Load Shed and Emergency Load Sequencer (LSELS) cabinets.

"Based upon the 10 CFR 21.21(b) transfer from Paragon Energy Solutions, Callaway Plant has determined that a Substantial Safety Hazard could be created by the failure of the power supplies. The responsible officer was notified on December 1, 2021.

"The NRC Resident Inspector at Callaway Plant has been notified."