30 avril 2015
Un câble transportant du 4 180 volts a brûlé et la boite de connexion métallique, en haut du moteur de la pompe de gavage de condensat, a fondu. L’urgence a été déclarée. La pompe de secours a pris le relais. Suite à la perte de cette pompe, la puissance du réacteur est tombée de 1,4 % et a été maintenue à ce niveau. Sans flamme ni feu visible. L’intervention des pompiers n’a pas été nécessaire.
Type : PWR - Puissance : 2 568 MWth- Première divergence : 04/1973
Available in english only.
Event Number : 51026
Facility : OCONEE - State : SC
Unit : [1] - RX Type : [1] B&W-L-LP
Event Date : 04/30/2015 - Event Time : 18:40
Emergency Class : UNUSUAL EVENT 10 CFR Section : 50.72(a) (1) (i) - EMERGENCY DECLARED
Initial PWR : 100 % Current PWR : 99 %
Event Text
UNUSUAL EVENT DECLARED DUE TO ELECTRICAL FAULT
"Unusual Event (4.6.U.1) was declared by the Shift Manager at Oconee Nuclear Station at 1840 EDT on 4/30/15 due to scorched 4160V cable and a hole created in metal connector coming into the top of 1C condensate booster pump motor electrical junction box. Unit 1 experienced a decrease in power to approximately 98.6% power due to the perturbation in condensate flow from the loss of 1C condensate booster pump. Unit 1 is currently stable at 98.6%. 1A condensate booster pump auto-started as expected. Smoke was observed and quickly dissipated. No visible fire or flame was observed. No Fire Brigade response required."
The Unusual Event was terminated at 1945 EDT on 4/30/15.
The licensee informed state/local agencies and the NRC Resident Inspector and does not plan to issue a press release.
Notified other Federal Agencies (DHS SWO, FEMA Ops, FEMA NWC, NICC Watch Officer and NuclearSSA).
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