12 décembre 2017
Ce transformateur qui a été perdu alimentait un bus de sécurité. En plus du démarrage du diesel, il y a eu le confinement des bâtiments primaires et secondaires ainsi que l’isolement intempestif du système de refroidissement du cœur du réacteur [RCIC].
Type : BWR Mark 3 - Puissance : 4 408 MWth - Première divergence : 8 / 1982 -
Available in english only
Event Number : 53115
Facility : GRAND GULF - State : MS
Unit : [1] - RX Type : [1] GE-6
Event Date : 12/12/2017 - Event Time : 09:18 [CST]
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
Initial PWR : 16 % Current PWR : 16 %
Event Text
AUTOMATIC START OF EDG DUE TO LOSS OF ESF TRANSFORMER
"At approximately 0918 CST on Tuesday, December 12, 2017, the Grand Gulf Nuclear Station experienced a loss of the Engineered Safety Features (ESF) Transformer 11 which was powering the Division 1 ESF bus. Subsequently, the station experienced an automatic start of the Division 1 Emergency Diesel Generator [EDG], partial isolation of the primary and secondary containment buildings and the isolation of the Reactor Core Isolation Cooling System [RCIC].
"It is not currently understood why the RCIC system isolated during this event. A team is investigating this issue separately from the loss of the ESF 11 transformer.
"The cause of the event is under investigation at this time.
"No other issues or unexpected events occurred.
"The NRC Resident Inspector has been notified of the event."
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2017/20171213en.html
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