9 juin 2012
Deux sources d’énergie électrique extérieure au site ont été inutilisables. Cette indisponibilité a duré 36 minutes. Les groupes diesels de secours ont fonctionné durant ce problème.
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Facility : BEAVER VALLEY - Region : 1 State : PA - Unit : [1]
Event Date : 09/06/2012 - Event Time : 14:16
Emergency Class : NON EMERGENCY ACCIDENT MITIGATION
1 N Y 100 Power Operation 100 Power Operation
Event Text
BOTH OFFSITE POWER SOURCES INOPERABLE
"At 1416 EDT, after consultation with the Unit 1 control room, the #1 138 KV bus in the Beaver Valley switchyard was deenergized by the grid system operator in response to a degraded switchyard breaker. The bus loss caused the Unit 1 A train offsite power supply to be inoperable. The Unit 1 B train offsite power supply was previously inoperable due to planned maintenance on its transformer cooling fan control circuit. The Unit 1 B train offsite power supply remained energized and available during this event. Both Emergency Diesel Generators remained operable and both emergency buses remained energized from the onsite source and operable during this event.
"At 1425 EDT the #1 138 KV bus was re-energized. The planned maintenance was completed on the B train offsite power supply transformer. Following testing, at 1452 EDT both offsite power supplies were declared operable.
"This notification is provided in accordance with 10CFR50.72(b)(3)(v)(D) since both offsite power supplies were inoperable from 1416 EDT to 1452 EDT on 9/6/12."
The licensee notified the NRC Resident Inspector.
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