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Home NRC Library Document Collections Events, Reports Associated with Event Notification Reports 2021

Event Notification Report for January 22, 2021

U.S. Nuclear Regulatory Commission
Operations Center

EVENT REPORTS FOR
01/21/2021 - 01/22/2021

EVENT NUMBERS
55079
Power Reactor
Event Number: 55079
Facility: Robinson
Region: 2     State: SC
Unit: [2] [] []
RX Type: [2] W-3-LP
NRC Notified By: Arence Gower
HQ OPS Officer: Donald Norwood
Notification Date: 01/21/2021
Notification Time: 17:10 [ET]
Event Date: 12/01/2020
Event Time: 09:46 [EST]
Last Update Date: 01/21/2021
Emergency Class: Non Emergency
10 CFR Section:
50.73(a)(1) - Invalid Specif System Actuation
Person (Organization):
MILLER, MARK (R2)
Power Reactor Unit Info
Unit SCRAM Code RX Crit Initial PWR Initial RX Mode Current PWR Current RX Mode
2 N N 0 Power Operation 0 Power Operation
Event Text
60-DAY OPTIONAL TELEPHONIC NOTIFICATION OF AN INVALID SPECIFIED SYSTEM ACTUATION

"This 60-day optional telephone notification is being made in lieu of an LER submittal, as allowed by 10 CFR 50.73(a)(1). This notification is made pursuant to the reporting requirements specified in 10 CFR 50.73(a)(2)(iv)(A) for an invalid actuation of one of the systems listed in 10 CFR 50.73(a)(2)(iv)(B).

"At 0946 hrs on December 1, 2020, with unit 2 in Mode 5 at 0% power, an invalid actuation of the Emergency Diesel Generators (EDG) 'A' and 'B', 'A' Residual Heat Removal (RHR) Pump, 'A' Service Water Booster Pump (SWBP), and Auxiliary Feed Water (AFW) Pumps 'A' and 'B' occurred. The actuation was caused by a Safety Injection (SI) signal while installing simulations to support Reactor Safeguards testing. The SI signal occurred when two out of three logic was met for Low Pressurizer Pressure, which was caused by a high resistance connection to a test point from a loose test lead.

"All aligned equipment, 'A' and 'B' EDGs, 'A' RHR Pump, 'A' SWBP and 'A' and 'B' AFW Pumps, responded properly to the auto-start signal and the actuation was complete. The actuation was not initiated in response to actual plant conditions, it was not an intentional manual initiation, and there were no parameters satisfying the requirements for initiation of the system. Therefore, this event has been determined to be an invalid actuation.

"There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector was notified."