29 octobre 2012
Le système de protection du réacteur n° 3 s’est enclenché automatiquement alors que le réacteur était à sa puissance nominale. L’arrêt s’est effectué normalement avec une insertion des barres de contrôle. Comme le réseau électrique est resté disponible, les diesels de secours ne se sont pas enclenchés. Le réacteur 2, pour sa part, est resté en fonctionnement à sa puissance nominale.
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INDIAN POINT : Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL Facility : INDIAN POINT - State : NY - Unit : [3]
Event Date : 10/29/2012 - Event Time : 22:41
Emergency Class : NON EMERGENCY - 50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL
Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode 3 A/R Y 100 Power Operation 0
Event Text
AUTOMATIC RPS ACTUATION ON GENERATOR TRIP
"On October 29, 2012, at 2241EDT, the Reactor Protection System automatically actuated at 100% reactor power due to a direct electrical trip to the Unit 3 Main Turbine Generator. The generator trip resulted in a turbine/reactor trip. All control rods fully inserted on the reactor trip. All plant equipment responded normally to the unit trip. This is reportable under 10 CFR 50.72(b)(2)(iv)(B). The plant is stable in Mode 3 at this time.
"The Auxiliary Feedwater System actuated following the automatic trip as expected. This is reportable under 10 CFR 50.72(b)(3)(iv)(A). The Emergency Diesel Generators did not start as offsite power remained available and stable. The unit remains on offsite power and all electrical loads are stable. No primary or secondary relief valves lifted. The plant is in Hot Standby at normal operating temperature and pressure with decay heat removal using auxiliary feedwater to the steam generators and normal heat removal through the condenser via condenser steam dumps. There was no radiation released.
"Indian Point Unit 2 was not affected by this event and remains at 100% power.
"A post trip investigation is in progress."
The licensee notified the NRC Resident Inspector. Notified R1DO (Caruso).
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2012/20121030en.html