19 juin 2014
L’opérateur avait deux mois pour déclarer "l’incident" survenu le 22 avril 2014 suite à l’activation intempestive d’un élément du système de protection du réacteur n° 2 alors que son cœur n’était pas critique. Au cours d’un test, alors que le réacteur était à l’arrêt, bien que le système de démarrage du groupe électrogène ait été bloqué, ce dernier a démarré jusqu’à 300 tours minutes.
Type : PWR - Puissance : 3 458 MWth - Première divergence : 03/1993
Available in english only.
Event Number : 50212
Facility : COMANCHE PEAK - State : TX
Unit : [2] RX Type : [2] W-4-LP
Event Date : 04/22/2014 - Event Time : 08:30
Emergency Class : NON EMERGENCY 10 CFR Section : 50.73(a)(1) - INVALID SPECIF SYSTEM ACTUATION Person (Organization) : MICHAEL HAY (R4DO)
Initial PWR : 0 % Current PWR : 0 %
Event Text
EMERGENCY DIESEL GENERATOR INVALID ACTUATION
"This report describes an invalid actuation of the Unit 2, Train A (2-01) Emergency Diesel Generator (EDG) that occurred on April 22, 2014. This report is being made in accordance with 10CFR50.73(a)(2)(iv)(A). 10CFR50.73(a)(1) states, in part, ’In the case of an invalid actuation reported under 10CFR50.73(a)(2)(iv), other than actuation of the Reactor Protection System (RPS) when the reactor is critical, the licensee may, at its option, provide a telephone notification to the NRC Operations Center within 60 days after discovery of the event instead of submitting a written LER.’
"On April 22, 2014, Comanche Peak Nuclear Power Plant Unit 2 was in Mode 5 during the 14th refueling outage. At approximately 0830 CDT, while performing a lockout test on EDG 2-01, the Reactor Operator made a place keeping error that resulted in EDG 2-01 starting and rolling up to approximately 300 RPM. The start signal should have been blocked as part of the test. However, a step was skipped due to a place keeping error and this resulted in an inadvertent start of EDG 2-01 during the performance of a subsequent step.
"The specific train and system that actuated was the Unit 2, Train A, Emergency Diesel Generator. During the inadvertent EDG start the system started and functioned correctly, and the EDG only reached 300 RPM before it was shut down.
"The licensee has notified the NRC Resident Inspector."
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2014/20140620en.html#en50212
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