28 août 2014
La voie « B » du chauffage, de la ventilation et de l’air conditionné (HVAC) était en cours de dépannage suite à une fuite d’huile. La voie « A » était également inutilisable suite à un problème d’électrovanne. La déclaration est effectuée suite à la perte d’un système qui vise à atténuer les conséquences d’un accident.
Type : BWR Mark 2 - Puissance : 3 546 MWth - Première divergence n° 1 : 06/1982 ; n° 2 : 03/1984
Available in english only.
Event Number : 50413
Facility : LASALLE - State : IL -
Unit : [1] [2] - RX Type : [1] GE-5,[2] GE-5 -
Event Date : 08/28/2014 - Event Time : 12:27
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(3)(v)(D) - ACCIDENT MITIGATION Person (Organization) : ANN MARIE STONE (R3DO)
Initial PWR Current PWR
1 N Y 100 % Power Operation 100 % Power Operation 2 N Y 100 % Power Operation 100 % Power Operation
Event Text
AUXILIARY ELECTRIC EQUIPMENT ROOM HVAC INOPERABLE
"This report is being made pursuant to 10CFR50.72(b)(3)(v)(D), Event or Condition that could have prevented fulfillment of a Safety Function needed to Mitigate the Consequences of an Accident. While the ’B’ train of Auxiliary Electric Equipment Room HVAC was inoperable and out of service for emergent repairs due to an oil leak, the ’A’ train of Auxiliary Electric Equipment Room HVAC became inoperable due to a failure of the liquid line solenoid valve. The Main Control Room Envelope consists of the Main Control Room and the Auxiliary Electric Equipment Room. Both the Control Room HVAC and the Auxiliary Electric Equipment Room HVAC systems are required to be operable in the current mode.
"This is a loss of safety function for a system that is intended to mitigate the consequences of an accident and is discussed in chapter 6 of the UFSAR and is Tech Spec required and is safety related. Also, the system, structure, or component (SSC) is inoperable in a required mode in the Tech Spec applicability and there is no redundant equipment in the same system that is operable.
"The required actions of Tech Spec 3.7.5 were entered for this event. Online Risk remains Green. The station is currently pursuing repairs to both trains."
The licensee notified the NRC Resident Inspector.
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2014/20140829en.html#en50413