While testing fire detection systems, a radio was keyed in the vicinity of the Auxiliary Shutdown Panel. Control Room alarms that occurred at the same time led to a review of plant data. This review revealed two momentary events (approximately 8 and 19 seconds) over an approximate two minute period that caused momentary reductions in the control signals to the
Auxiliary Feedwater Pump and Motor-Driven
Feedwater Pump discharge control valves. These momentary signal reductions resulted in all trains of Emergency
Feedwater being
inoperable for approximately two minutes, pending further evaluation.
With all trains of Emergency Feedwater inoperable, this event is being reported in accordance with 10 CFR 50.72(b)(3)(v) as a momentary loss of safety function for equipment needed to (A) shut down the reactor and maintain it in a safe shutdown condition and to (B) remove residual heat.
Fire detection testing has been completed, and a sign placed on the Auxiliary Shutdown Panel Room door stating that no radio usage is permitted inside the room.
All trains of Emergency Feedwater are now operable.
The licensee has notified the NRC Resident Inspector.