9 juin 2017
Ce problème empêche le maintient de radioéléments dans les bâtiments, ces derniers s’échappant, de fait, dans la nature.
Type : BWR Mark 2 - Puissance : 3 952 MWth - Première divergence : n° 1 : 1 / 09 / 1982 - n° 2 : 1 / 05 / 1984 -
Available in english only
Event Number : 52797
Facility : SUSQUEHANNA
State : PA - Unit :   - RX Type :  GE-4, GE-4
Event Date : 06/09/2017 - Event Time : 05:09 [EDT]
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(3)(v)(C) - POT UNCNTRL RAD REL
Initial PWR : 0 % Current PWR : 0 %
EXHAUST FAN BREAKER FAILURE CAUSING LOW SECONDARY CONTAINMENT DIFFERENTIAL PRESSURE
"On June 9, 2017 at 0509 [EDT], Secondary Containment Zone 3 (Unit 1 and 2 Reactor Building) differential pressure lowered to 0 [inches] WG [water gauge] during a routine restoration due to equipment failure. One of the two Unit 1 Zone 3 exhaust fan breakers experienced a failure that during procedural restoration caused Secondary Containment Zone 3 to experience a positive differential pressure. Required differential pressure per SR 22.214.171.124.1 could not be maintained.
"Zone 3 differential pressure was recovered to [greater than] 0.25 [inches] WG following restart of Unit 2 Zone 3 Secondary Containment fans. All other Zones of Secondary Containment were unaffected by this event.
"This event is being reported under 10 CFR 50.72(b)(3)(v)(C) and per the guidance of NUREG 1022 Rev 3 section 3.2.7 as a loss of a Safety Function. There is no redundant Susquehanna Secondary Containment System.
"The NRC Resident Inspector has been notified."