18 juillet 2012
Le réacteur 1 à 100 % de puissance a perdu des alimentations suite à une explosion dans un local électrique. Cette coupure a entrainé la perte de deux pompes de recirculation. Le réacteur a été mis à l’arrêt manuellement. La situation d’urgence a été décrétée.
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Region : 1 State : PA - Unit : [1] [ ] [ ] -
Event Date : 07/18/2012 - Event Time : 08:15
Emergency Class : UNUSUAL EVENT
50.72(a) (1) (i) - EMERGENCY DECLARED 50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL
UNUSUAL EVENT DECLARED DUE TO FLASHOVER IN THE LOAD CENTER TRANSFORMER CABINET
"An electrical transformer fault occurred resulting in a loss of both Recirc Pumps. The reactor was manually scrammed from 100% power as required by Plant Procedure OT-112.
"The electrical transformer was walked down by Operations supervisor. Licensee’s assessment was that a flashover occurred, and was confined to the load center transformer cabinet. Based on observed damage, EAL declaration of HU3 was made."
HU3 is identified as an explosion within the Protected Area.
The licensee has notified the NRC Resident Inspector. Licensee also notified state, local and other government agencies.
Notified other agencies (DHS SWO, FEMA, DHS NICC)
* * * UPDATE FROM BRIAN DEVINE TO JOHN KNOKE AT 1022 EDT ON 07/18/12 * * *
"Limerick, Unit 1 is terminating from their Unusual Event (HU3) due to the initiating event and conditions no longer being present. The 124A Fault was isolated by the trip of the designed protection features (feeder breaker trip). A walkdown of the area/equipment was completed with no adverse conditions noted. Normal plant shutdown activities are in progress. The area/equipment is quarantined for investigation."
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2012/20120719en.html
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