16 juillet 2014
Alors qu’ils démarraient le réacteur - qui était à 55 % de sa puissance nominale - les opérateurs ont lancé sa mise à l’arrêt d’urgence suite à la perte de vide au condenseur. La cause de cette perte est en cours de recherche.
Type : Fukushima 1 (BWR Mark 1) - Puissance : 1 930 MWth - Première divergence : 05/1969
Available in english only.
Event Number : 50270
Facility : OYSTER CREEK - State : NJ - Unit : [1] - RX Type : [1] GE-2
Event Date : 07/11/2014 - Event Time : 03:14
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL
Initial PWR : 55 % - Current PWR : 0 %
Event Text
MANUAL SCRAM DUE TO LOSS OF MAIN CONDENSER VACUUM
"Today at approximately 0312 [EDT on 7/11/14], during a planned reactor power ascension with reactor power at approximately 55 percent of rated thermal power, main condenser vacuum began to lower. In accordance with the abnormal operating procedure for degrading vacuum, Operators inserted a manual scram of the reactor at 0314 [EDT]. The cause of the degraded vacuum is currently under investigation.
"All rods inserted into the core and all systems functioned as expected during the scram. No electromatic (EMRVs) or safety relief valves lifted during the transient.
"This event is reportable within 4 hours per 10CFR50.72(b)(2)(iv)(B) - any event or condition that results in actuation of the reactor protection system (RPS) when the reactor is critical except when the actuation results from and is part of a pre-planned sequence during testing or reactor operation."
The scram was uncomplicated, normal offsite power is available, and plant is being cooled down to cold shutdown. The cause of the degraded condenser vacuum is suspected condenser boot degradation.
The licensee has informed the NRC Resident Inspector.
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