19 décembre 2013
Perte de la pression négative de l’enceinte de confinement suite à l’arrêt des ventilateurs chargés d’assurer cette dépressurisation. Le système a été restauré manuellement et la raison de son non démarrage automatique est en cours de recherche. La dépressurisation a pour but de limiter les rejets de radioéléments dans l’environnement.
Type : BWR type Mark 1 - Puissance : 3 840 MWTh - Première divergence : 06/1986
Available in english only.
Event Number : 49665
Facility : HOPE CREEK - State : NJ - Unit : [1] RX Type : [1] GE-4
Event Date : 12/19/2013 - Event Time : 15:11 -
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
LOSS OF REACTOR BUILDING VENTILATION
"At 1511 [EST] on December 19, 2013, bus 10A404 (D channel 4 kv 1E vital bus) deenergized while transferring infeed breakers after degraded voltage testing. Reactor building ventilation fans tripped resulting in a loss of secondary containment negative pressure. Filtration Recirculation and Ventilation System (FRVS) was manually started and secondary containment negative pressure was restored at 1525 [EST].
"Secondary containment pressure is stable with differential pressure negative.
"The technical specification requirement is to maintain secondary containment at a negative pressure for secondary containment integrity. Declaring secondary containment inoperable is reportable under 10CFR50.72(b)(3)(v)(C) as an event or condition that could have prevented the fulfillment of a safety function needed to control the release of radioactive material.
"The standby reactor building ventilation fans did not automatically start and [the reason for that] is being investigated."
The licensee notified the NRC Resident Inspector and will notify the Lower Alloways Creek township.
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2013/20131220en.html
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