Event Notification Report for November 19, 2018

EMERGENCY DIESEL GENERATOR ACTUATION DUE TO LOW VOLTAGE SIGNAL

"On 11/19/2018, at 1916 EST, with unit 2 in Mode 5 at 0 percent power, an actuation of the 'B' [Emergency Diesel Generator] EDG occurred during troubleshooting activities with the opposite train protected. The reason for the 'B' EDG auto-start was low voltage on the E-2 bus due to its supply breaker opening. The 'B' EDG automatically started as designed when the low voltage signal was received. Following the EDG start, required loads sequenced on as designed including the 'B' [Motor Driven Auxiliary Feedwater Pump] MDAFW Pump.

"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 Emergency AC Electrical Power System (Emergency Diesel Generator) and Auxiliary Feedwater System (Motor Driven Auxiliary Feedwater Pump).

"There was no impact on the health and safety of the public or plant personnel.

"The NRC Resident Inspector has been notified."

CONTAMINATED WORKER REQUIRING MEDICAL TREATMENT

"On November 19, 2018, at approximately 1130 [EST], a conversion area worker was cleaning up a spill of liquid uranyl fluoride (UO2F2) that can contain hydrofluoric acid (HF). During the cleanup effort, some amount of this solution was able to come in contact with the worker's clothing potentially impacting their skin on the legs above the ankle. Appropriate treatment for exposure to HF was provided by onsite medical response staff. When the operator attempted to exit the chemical side of the plant, radioactive material contamination was detected on both hands. The contamination on both hands was above free release criteria and was unable to be removed by normal decontamination methods. The worker was transported to an offsite medical facility accompanied by plant health physics personnel. The worker was sent to the hospital for observation due to the potential chemical exposure.

"The Columbia plant is a licensed Part 70 facility subject to 10 CFR 70 Subpart H. Spills within the conversion area of the plant are evaluated in the Integrated Safety Analysis and Summary. This issue does not challenge the performance requirements of 10 CFR 70.61.

"Operations staff finished cleaning up the spill. At the time of this notification, the employee reported to management that they are awaiting discharge from the hospital. This issue has been entered into the facility's corrective action program.

"24-Hour Event Notification based on 10 CFR 70.50(b)(3), 'An event that requires unplanned medical treatment at a medical facility of an individual with spreadable radioactive contamination on the individual's clothing or body.' Also applicable to this issue is a 24-Hour Event Notification based on 10 CFR 70 Appendix A(c), 'Any event or situation, related to the health and safety of the public or onsite personnel, or protection of the environment, for which a news release is planned or notification to other government agencies has been or will be made, shall be reported to the NRC Operations Center concurrent to the news release or other notification.' This issue requires notification to the South Carolina (SC) Department of labor, Division of Occupational Safety and Health."

The licensee has notified NRC Region 2.