21 juillet 2015
C’est un déclenchement turbine qui est à l’origine de l’arrêt du réacteur n° 2 qui était en cours de redémarrage. L’unité a été placée en arrêt à chaud, la chaleur du cœur étant retirée via le condenseur. C’est au moment de tests réalisés sur la protection du circuit que le problème s’est produit et dont l’origine est en cours de recherche.
Type : PWR - Puissance : 2 857 MWth - Première divergence : 07/1972
Available in english only.
Event Number : 51244
Facility : SURRY - State : VA
Unit : [2] - RX Type : [2] W-3-LP
Event Date : 07/21/2015 - Event Time : 05:04
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL
Initial PWR : 5 % - Current PWR 0%
Event Text
SURRY UNIT 2 TRIP DURING REACTOR STARTUP
"Unit 2 Reactor automatically tripped during Unit start up following a maintenance outage. The first indication of the reactor trip was the annunciator Reactor Trip by Turbine Trip. There were no complications following the trip and Unit 2 is stable at Hot Shut Down. Decay Heat Removal is being maintained by dumping steam to the Main Condenser. Steam Generator water level is being maintained by the Main Feedwater system.
"At the time of the Reactor Trip, Overspeed Protection Circuitry (OPC) Test was being performed on the Unit 2 Main Turbine. The SOV Turbine Trip annunciator was received. The cause of the reactor trip is under investigation.
"This notification is being made pursuant to 10 CFR 50.72(b)(2)(iv)(B) for 4-hour notification of Reactor Protection System activation. The Plant responded as expected for the trip. The NRC resident has been notified of the event.
"There was no radiation release due to this event, nor were there any personnel injuries or contamination events."
The licensee has notified the NRC Resident Inspector.
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2015/20150722en.html#en51244
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