10 juin 2014
Cette indisponibilité a duré 4 minutes, le temps de rétablir le fonctionnement des ventilateurs de la double enceinte.
Type : BWR Mark 2 - Puissance : 3 988 MWTh - Première divergence : 05/1987
Available in english only.
Event Number : 50187
Facility : NINE MILE POINT - 1 State : NY - Unit : [2] - Type : GE-5
Event Date : 06/10/2014 - Event Time : 20:32
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(3)(v)(C) - POT UNCNTRL RAD REL
Initial PWR : 100 % Current PWR : 100 %
Event Text
SECONDARY CONTAINMENT DECLARED INOPERABLE
"Nine Mile Point Unit 2 Secondary Containment was declared inoperable on 6/10/14 from 2032 EDT until 2036 EDT during the restoration of Reactor Building Ventilation System to a normal lineup.
"While performing actions to restore ventilation fans the Above Refuel Floor Exhaust Fan, 2HVR-FN5A, tripped when started resulting in building differential pressure becoming less negative than -0.25 inches. Tech Spec 3.6.4.1 Secondary Containment, Action A.1 to restore within 4 hours was entered at 2032 EDT on 6/10/14.
"The standby Above Refuel Floor Exhaust Fan, 2HVR-FN5B, was started per procedure and building differential pressure was restored. Secondary Containment was declared operable at 2036 EDT on 6/10/14 and Tech Spec 3.6.4.1 action was exited.
"Secondary containment being inoperable is a 8-hour report for 10 CFR 50.72(b)(3)(v)(c), Any event or condition that at the time of discovery could have prevented the fulfillment of the safety function of structures or systems that are needed to control the release of radioactive material."
The licensee has notified the NRC Resident Inspector and will notify the State of New York.
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2014/20140612en.html
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