30 avril 2018
Ce déclenchement de turbine est survenu suite à la tombée de sa génératrice d’alimentation électrique. La cause de la perte de la génératrice est en cours de recherche. Après le déclenchement du réacteur, la pompe d’alimentation auxiliaire en eau a démarré pour fournir l’eau pour les 4 générateurs de vapeur. Quand la pompe d’alimentation en eau a démarré, celle d’alimentation auxiliaire a été arrêtée.
Le système de filtrage et de ventilation de la salle de commande est entré en service suite à une signal d’activation parasite.
Aucune soupape de décharge de vapeur secondaire n’a été activée suite à l’arrêt du réacteur qui est refroidi par le condenseur via les soupapes principales de décharge.
▸ Type : PWR- Puissance : 3 586 MWth - Première divergence : 05 / 1987-
Available in english only
Event Number : 53371
Facility : BRAIDWOOD - State : IL
Unit : [1] - RX Type : [1] W-4-LP
Event Date : 04/30/2018 - Event Time : 11:24 [CDT]
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 : 48 % Current PWR : 0 %
Event Text
AUTOMATIC REACTOR TRIP FOLLOWING TURBINE TRIP
"At 1124 CDT, Braidwood Unit 1 experienced an automatic Reactor Trip. The cause of the Reactor Trip was a Turbine Trip with reactor power greater than P-8. The turbine trip was actuated as a result of a Turbine Motoring Generator Trip. The cause of the generator trip is unknown at this time and is under investigation.
"After the Reactor Trip occurred, the 1A Auxiliary Feedwater pump was manually started to provide feedwater flow to all four steam generators. The 1A Auxiliary Feedwater pump was subsequently secured and placed in standby when the Startup Feedwater pump was placed in service.
"Train A Main Control Room Ventilation Filtration system shifted to Makeup Mode due to a spurious actuation signal.
"No secondary relief valves lifted and no secondary steam was released as a result of the Reactor Trip. The Main Steam dump valves are in service to the Main Condenser to provide heat sink cooling. The plant is being maintained at normal operating pressure and temperature. AC power is being provided by Offsite Power with the Diesel Generators in standby and all safety systems available. There is no impact to Unit 2.
"This report is being made per 10 CFR 50.72(b)(2)(iv)(B) for a RPS actuation, 4-hr notification, and per 10 CFR 50.72(b)(3)(iv)(A) for a manual actuation of the Auxiliary Feedwater system, 8-hr notification."
The licensee notified the NRC Resident Inspector and Illinois Emergency Management Agency.
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2018/20180501en.html#en53371
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