Event Notification Report for August 17, 2022

EN Revision Imported Date: 8/17/2022

EN Revision Text: AUXILIARY FEEDWATER ACTUATION SIGNAL RECEIVED DUE TO HUMAN PERFORMANCE ERROR

The following information was provided by the licensee via email:

"At 1949 CDT, while operating in Mode 1 at 46 percent power, an Auxiliary Feedwater actuation signal resulted from a human performance error while performing SYS AE-121 to place a second main feedwater pump in service. All systems responded correctly and were restored to standby condition. The Unit remained in Mode 1, at 47 percent power following the actuation. 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 the Auxiliary Feedwater System.

"The Senior NRC Resident Inspector has been informed."

* * * RETRACTION ON 8/16/22 AT 1406 EDT FROM JASON KNUST TO BRIAN P. SMITH * * *

"Wolf Creek is retracting the original notification (EN# 56013) of a valid actuation and has recategorized this as a 60-day optional (see EN #56047)."

Notified R4DO (Werner)

AGREEMENT STATE REPORT - FIRE EXPOSURE TO RADIATION SOURCE


The following information was provided by the Oklahoma Department of Environmental Quality (DEQ) via email:

"Western Farmers Electric Cooperative (WFEC) currently holds a radiation license (OK-19428-01) for multiple gauges utilized at [the WFEC] Hugo Power Plant. This is a steam plant that operates with coal to generate electricity. A fire was reported at the plant exposing one gauge to high temperatures but did not expose the gauge to direct flames. Based on [the licensee's] phone conversation [with the DEQ] on August 8, 2022, at 1136 [CDT]. The licensee provided this description of the events.

"On August 5, 2022, at 2240 [CDT] smoke was reported in coal bunker D. Staff immediately began procedures to extinguish the fire. Coal bunker D is located directly below coal feeder D and this caused thermal heat around the piping which feeds coal feeder D. A plug detector, which is a RA-226 source, is mounted around this pipe. By 0600 [CDT] on August 6, 2022, the Coal Bunker D was down to 120 degrees [Fahrenheit]. The plant staff notified the WFEC Radiation Safety Officer (RSO), at 0640 [CDT] to check the nuclear gauging device (D FDR Top, serial #SE2562, source amount is 2 mCi).

"Upon arriving at the plant, the RSO surveyed the area around the gauge and determined the area was safe. The gauge had received radiant heat from the fire causing the paint to be removed from the gauge. The survey meter read 0.7mR/hr to 1.0mR/hr around the gauge which is normal. The RSO also conducted an in house leak test checking with the survey meter. The background was 0.1mR/hr and sample was 0.2mR/hr. WFEC is contacting the manufacturer to determine if further inspection is needed."

The licensee believes that no radiation exposure or leaks have occurred. Additional information will be provided by the DEQ as it becomes available.

AGREEMENT STATE REPORT - UNABLE TO RETRACT SOURCE IN INDUSTRIAL GAUGE
The following information was obtained from the Commonwealth of Virginia via email:

"On August 10, 2022, at 12:59 p.m. [EDT], the [Virginia] Office of Radiological Health Radioactive Materials Program (RMP) received an incident notification from the licensee. The source, 5 millicuries of Cs-137, could not be retracted behind the shutter during routine operations. The incident occurred on August 10, 2022 at about 12:00 p.m. (noon). The Radiation Safety Officer (RSO) stated that the insertion source detached from the retrieval cable during routine operations (due to high vibrations). The source was stuck in the dip tube (inside the insulation vat). They performed radiation surveys showing that no elevated levels were occurring outside of the insulation vat. Based on the notification, there was no personnel or public exposure due to this incident. The RSO contacted Berthold Technologies to come and perform the source retrieval. They are planning on arriving on August 11, 2022. This notification will be updated when additional information is obtained."

Virginia Event Report ID No.: VA220002

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."

FITNESS FOR DUTY REPORT
A licensed employee had a confirmed positive for alcohol during a random fitness-for-duty test. The employee's access to the plant has been terminated.

INVALID ACTUATION OF AUXILIARY FEEDWATER

The following information was provided by the licensee via email:

"This 60-day telephone notification is being made under the reporting requirements specified by 10 CFR 50.73(a)(2)(iv)(A) and 10 CFR 50.73(a)(1) to describe an invalid actuation of the auxiliary feedwater system. At 1949 Central Daylight Time (CDT), on 7/22/22, an invalid actuation of the auxiliary feedwater system occurred due to human error. At the time of the event, Wolf Creek Generating Station was coming out of a forced outage. Plant conditions were 47 percent power with operators increasing power approximately 10 percent per hour. At this power level there was one main feedwater pump in service and Operations was performing the procedure to place the second main feedwater pump into service. A control room operator was verifying that the control oil switches were not tripped for the main feedwater pumps by verifying the bulbs for both the 'A' and 'B' trains were not lit. To verify the unlit bulbs were not burnt out, the operator was pushing the lamp test buttons. The operator successfully verified the 'A' train, but on the 'B' train the operator mistakenly pushed the bi-stable which is located directly above the bulb rather than the lamp test button. This bi-stable is the low oil pressure switch for the 'A' main feedwater pump. Because the second feedwater pump was not running yet, this caused a 'two out of two' signal for low oil pressure and caused an auxiliary feedwater system actuation.

"The auxiliary feedwater system responded correctly and was returned to standby condition.

"The Senior Resident Inspector has been notified."