22 octobre 2013
Mise à l’arrêt manuel du réacteur n° 2 suite à une baisse du niveau de vide dans le condenseur prinicipal. Un circuit de sûreté prévu pour rétablir le niveau de vide n’aurait pas été opérationnel car il était en cours de maintenance. Le cœur étant critique, les systèmes de protection du réacteur se sont enclenchés. L’arrêt se serait effectué correctement.
Type : PWR - Première divergence : mars 1989 - Puissance : 3625 MWTh
Available in english only.
Facility : VOGTLE - 2 State : GA - Unit : [2] - RX Type : W-4-LP
Event Date : 10/22/2013 - Event Time : 11:44 [EDT]
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL 50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
Initial PWR : 27 % Current power : 0 %
Event Text
MANUAL REACTOR TRIP DUE TO DECREASING CONDENSER VACUUM
"At 1144 EDT, Vogtle Unit Two was manually tripped in response to lowering Main Condenser vacuum. The Unit 2 Bravo Main Feed Pump was tagged out for scheduled maintenance and the casing was being removed when condenser vacuum started lower due to isolation valve not holding pressure. Main Condenser vacuum lowered to less than procedural limits for continued plant operation.
"All systems operated correctly in response to the reactor trip. All control rods fully inserted. AFW was placed in service to control Steam Generator levels. System response allowed for an uncomplicated reactor trip response. Plant is stable in Mode 3 while performing a cause investigation.
"The NRC Senior Resident Inspector was notified and at plant site."
The plant is in a normal post-trip electrical line-up. Decay heat is being removed via the steam dumps to the Main Condenser.
Event Number : 49461
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2013/20131023en.html#en49461
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