23 juin 2015
Suite à des conditions météorologiques difficiles, l’opérateur Exelon Generation Compagny a identifié la perte du système de notification d’urgence, du réseau terrestre physique de téléphonie, ainsi que les systèmes de sauvegarde. Ce problème est à déclarer suite à la perte majeure de capacité d’un système de protection civile. L’opérateur a contacté la NRC afin de lui fournir un numéro de secours jusqu’à ce que les systèmes défaillants aient été restaurés. Les systèmes de communication ont été restaurés 4h01 après leur disparition.
Type : Fukushima I (BWR Mark I) - Puissance : 2 597 MWth - Première divergence : n° 1 : 01/1970 ; n° 2 : 01/1971
Available in english only.
Event Number : 51173
Facility : DRESDEN - Region : 3 State : IL
▸ Unit : [2] [3] - RX Type : [2] GE-3,[3] GE-3
Event Date : 06/23/2015 - Event Time : 03:42
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
Initial PWR Current PWR
2 N Y 100 % Power Operation 100 % Power Operation 3 N Y 100 % Power Operation 100 % Power Operation
Event Text
LOSS OF EMERGENCY PREPAREDNESS CAPABILITY DUE TO PHONE SYSTEM FAILURES
"At 0342 [CDT], as a result of severe weather conditions in the area, Exelon Generation Company, LLC (EGC) identified that the Emergency Notification System (ENS), Health Physics Network (HPN) phone systems, and their associated back-up system, the commercial phone system, had failed at Dresden Nuclear Power Station (DNPS). A loss of the primary phone system concurrent with the loss of the associated back-up system is a reportable condition in accordance with 10 CFR 50.72 (b)(3)(xiii) - Major Loss of Emergency Preparedness Capabilities.
"As a result of the failed communication systems, DNPS contacted the NRC to notify them of the issue and provided an alternate phone number for the Shift Manager for use until the systems were restored.
"As of 0743 [CDT], ENS, HPN, and the commercial phone systems were restored and verified to be working properly."
The licensee notified the NRC Resident Inspector.