2 novembre 2012
A 1h42, le réacteur a été mis maunuellement à l’arrêt suite à la détection d’une température élevée sur une pompe de refroidissement superposée à une alarme indiquant un défaut de niveau d’huile.
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Le passage à l’arrêt s’est effectué normalement sans que soit nécessaire le démarrage des groupes électrogènes de secours.
Le réacteur est en arrêt à 292 °C alimenté par les lignes électriques extérieures au site.
Facility : COMANCHE PEAK - Region : 4 State : TX - Unit : [1] Event Date : 11/02/2012 - Event Time : 01:42 -
Emergency Class : NON EMERGENCY 50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL
Initial PWR Current PWR 100 Power Operation 0 Hot Standby
Event Text
MANUAL REACTOR TRIP DUE TO HIGH REACTOR COOLANT PUMP MOTOR BEARING TEMPERATURE
"At 0142 CDT, Comanche Peak Nuclear Power Plant Unit 1 was manually tripped due to high temperature indications on the 1-04 reactor coolant pump motor radial bearing concurrent with a high / low oil reservoir level alarm. The trip was uncomplicated ; all control rods and shutdown rods fully inserted ; neither emergency diesel generator started ; all safety systems functioned as designed. Both motor driven and the turbine driven auxiliary feed water pumps started as required to restore steam generator levels as a result of the trip. The turbine driven AFW pump was stopped per procedure and returned to auto-start status. Currently, Unit 1 is in Mode 3, no load Tave of 557 degrees F, with temperature being maintained with AFW and steam dumps to the main condenser. All electrical busses are powered from offsite and grid conditions are stable."
The licensee has notified the NRC Resident Inspector.
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2012/20121105en.html
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