5 mai 2015
Alors que les pompes d’alimentation en eau des générateurs de vapeur étaient déclenchées, la seconde voie d’alimentation en eau a également été déclenchée pendant le dépannage. L’accumulation de ces deux déclenchements a entrainé le démarrage automatique des pompes d’alimentation auxiliaire en eau. Les deux pompes d’alimentation des générateurs de vapeur étaient déjà en service quand l’activation s’est produite. Durant ces manœuvres, la chaleur du cœur a été retirée par le condenseur.
Type : PWR - Puissance : 2 775 MWTh - Première divergence : 08/1977
Available in english only.
Event Number : 51043
Facility : FARLEY - 2 State : AL -
Unit : [1] - RX Type : [1] W-3-LP
Event Date : 05/05/2015 - Event Time : 04:22
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
Initial PWR : 1% Current PWR : 1%
Event Text
AUXILIARY FEEDWATER PUMP AUTO START SIGNAL INITIATED DURING STARTUP
"At 0422 CDT on 5/5/2015, with Farley Nuclear Plant Unit 1 in Mode 2, and the 1A Steam Generator Feedwater Pump (SGFP) in the tripped condition, the 1B SGFP was manually tripped during troubleshooting. The trip of the second SGFP initiated the auto start signal for the MDAFWPs [motor driven aux feedwater pumps] due to the auto start signal not being defeated. Both MDAFW pumps were in service supplying AFW to the steam generators (SG) when the actuation signal was received. The effects of the auto start signal were to fully open the AFW Flow Control Valves and isolate SG blowdown and SG blowdown sample valves. These actions occurred successfully and the auto start signal was reset. There was no adverse impact to the plant and decay heat continued to be removed through the condenser throughout the event.
"The NRC Resident Inspector has been notified."
La boutique
Informez vous