29 septembre 2015
Sur l’unité n° 1, alors qu’une voie de traitement de gaz était en cours de maintenance, l’autre voie a été découverte en dehors des critères de fonctionnement. Une voie a été rétablie 1h45 après la découverte du problème.
Type : BWR Mark II - Première divergence : 09/1982
Available in english only.
Event Number : 51432
Facility : SUSQUEHANNA
State : PA Unit : [1]
RX Type : [1] GE-4,
Event Date : 09/29/2015 - Event Time : 10:30
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
BOTH TRAINS OF THE STANDBY GAS TREATMENT SYSTEM DECLARED INOPERABLE
"On 9/29/15 at 1020 EDT, the ’B’ train of Standby Gas Treatment System was declared inoperable for planned testing. On 9/29/15 at 1030 EDT, during performance of a surveillance on Unit 1 Reactor Pressure Vessel water level instrumentation, one channel was found to not meet acceptance criteria. The failed level channel is part of the initiation logic for the ’A’ train of Standby Gas Treatment. This resulted in a loss of safety function for the Standby Gas Treatment System. On 9/29/15 at 1145 EDT, the ’B’ train of Standby Gas Treatment was restored to operable by restoring from the planned testing.
"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."
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2015/20150930en.html#en51432
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