25 juin 2016
Lors de la montée en puissance du réacteur à 100 %, les vannes de régulation de la turbine se sont fermées intempestivement entrainant la mise en route du système de protection du réacteur. Cette mise en route a provoqué à son tour l’arrêt d’urgence du réacteur. Tous les systèmes de sécurité auraient correctement fonctionné. L’origine du problème est en cours de recherche.
Type : BWR Mark 3 - puissance : 4 408 MWth - Première divergence : 08 / 1982 -
Available in english only
Event Number : 52044
Facility : GRAND GULF - State : MS
Unit : [1] - RX Type : [1] GE-6
Event Date : 06/25/2016 Event Time : 14:07 [CDT]
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL
50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
Initial PWR : 99 % Current PWR : 0 %
Event Text
AUTOMATIC REACTOR SCRAM DUE TO TURBINE TRIP
"At 1407 [CDT], during power ascension to 100 percent, turbine control valves closed unexpectedly causing reactor protection trip signals that in turn caused a reactor scram. Reactor scram, turbine trip ONEPs [Off Normal Event Procedure], and EP2 [Emergency Procedure for Level Control] were entered. Reactor water level was stabilized at 36 inches narrow range on startup level and reactor pressure stabilized at 935 psig using bypass valves. No other safety system actuations occurred and all systems performed as designed."
All control rods inserted. Reactor level is maintained by feedwater. Normal electrical shutdown configuration is through offsite electrical power sources. The Safety Relief Valves lifted, then closed. The plant is stable at normal level and pressure and remains in Mode 3. The event is under licensee investigation.
The licensee notified the NRC Resident Inspector.
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2016/20160627en.html
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