27 juillet 2015
Le réacteur, en cours de démarrage, était à 17 % de sa puissance lorsqu’un générateur de vapeur a connu un niveau d’eau trop bas. C’est un défaut d’ouverture d’un vanne qui a entrainé ce déficit d’eau. Tous les systèmes ont fonctionné correctement et le réacteur a été stabilisé à 16 % de sa puissance.
Type : PWR - Puissance : 2 568 MWth - Première divergence : 11/1973
Available in english only.
Event Number : 51268
Facility : OCONEE - State : SC -
Unit : [2] - RX Type : [2] B&W-L-LP
Event Date : 07/27/2015 - Event Time : 09:56
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
Initial PWR : 17 % - Current PWR : 16 %
Event Text
VALID ACTUATION OF UNIT 2 EMERGENCY FEEDWATER SYSTEM DURING STARTUP
"At approximately 0956 EDT on July 27, 2015, Oconee Nuclear Station Unit 2 experienced a valid actuation of the Emergency Feedwater System [EFW]. At the time of the event, Unit 2 was in Mode 1 at approximately 17% power and increasing with preparations in progress for placing the main turbine on line during a unit startup. The [EFW] actuation was due to a low level on the 2B steam generator, which resulted from failure of 2B Main Feedwater Block Valve 2FDW-40 to automatically open upon demand. All systems operated as expected with no problems observed. Unit 2 is currently stable at approximately 16% power while troubleshooting valve 2FDW-40 [and the 2B Steam Generator level stable at the normal operating level]. Units 1 and 3 were unaffected and remain on line and stable at 100% power. Public health and safety were not impacted by this event.
"This event is being reported as an 8 hour non-emergency in accordance with 10 CPR 50.72(b)(3)(iv) for a valid actuation of the Emergency Feedwater System.
"The NRC Resident Inspector has been notified.
"Corrective Action : Troubleshooting of valve 2FDW-40 is on-going."
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2015/20150728en.html#en51268
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