21 février 2013
Arrêt automatique du réacteur n° 1 suite à la perte d’alimentation de la turbine, elle-même due à la perte de deux pompes principales. L’arrêt du réacteur s’est effectué normalement avec les barres de commande complètement insérées.
Première divergence : août 1981 - Puissance 1 100 : Type : PWR -
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Facility : MCGUIRE - Region : 2 State : NC Unit : [1] - RX Type : [1] W-4-LP Event Date : 02/21/2013 - Event Time : 09:57
Emergency Class : NON EMERGENCY 50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL 50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
Initial PWR 100 % Current PWR 0 % Hot Standby
Event Text
AUTOMATIC REACTOR TRIP DUE TO TURBINE TRIP ON LOSS OF BOTH MAIN FEED PUMPS
At 0957 EST on 02/21/13, Unit 1 Reactor automatically tripped from 100% power, due to a turbine trip. The turbine trip was caused by a loss of both main feedwater (MFW) pumps. The 1A motor driven auxiliary feedwater (AFW) pump auto started to feed the "A" and "B" Steam Generators (S/G). The 1B motor driven AFW pump was unavailable due to planned maintenance, so the turbine driven AFW pump was manually started to feed the "C" and "D" S/Gs.
The reactor trip was uncomplicated. All control rods fully inserted. Decay heat removal is to the main condenser via the turbine bypass valves. There was no primary to secondary leakage. Electrical buses are being supplied via offsite power. Steam generator levels are being returned to normal and MFW has been reset and is available. All other plant systems functioned as designed during and after the reactor trip. There is no impact on Unit 2. There is no impact on the health and safety of the public. The loss of the MFW pumps is still under investigation.
The licensee has informed the NRC Resident Inspector.
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2013/20130222en.html
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