11 août 2016
Les opérateurs ont arrêté d’urgence et manuellement le réacteur suite à la perte de deux des 4 pompes de circulation. Cette perte a engendré un vide dans le condenseur. La cause de la perte des pompes est inconnue mais les premières indications montrent qu’un coup de foudre aurait engendré des perturbations électriques.
Type : PWR - Puissance : 2 700 MWth - Première divergence : 10 / 1975 -
Available in english only
Event Number : 52169
Facility : MILLSTONE
State : CT - Unit : [2] - RX Type : [2] CE - Event Date : 08/11/2016 - Event Time : 09:59
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL
Initial PWR : 100 % Current PWR : 0 %
Event Text
MANUAL REACTOR TRIP DUE TO LOSS OF TWO CIRCULATING WATER PUMPS
Reactor operators manually tripped the reactor due to the loss of two out of four circulating water pumps which caused a drop in condenser vacuum. The trip was uncomplicated. The reactor is shutdown and stable with decay heat removal via steam dumps to the condenser. The cause of the circulating water pump trips is currently unknown, but initial indications are that the pumps tripped due to a lightning strike that caused an electrical perturbation. The reactor will remain shutdown while the licensee investigates the cause. Unit 3 was not affected.
The licensee notified the NRC Resident Inspector and the State and Local governments.
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2016/20160812en.html
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