25 février 2019
L’arrêt de 74 % de puissance à zéro se serait effectué sans problème. Le refroidissement du cœur est assuré par le condenseur via les vannes de contournement de la turbine. La cause de la tombée de la turbine est en cours de recherche mais il semble que des perturbations sur le réseau électrique soient à l’origine du problème.
Type : BWR Mark III - Puissance : 3 758 MWth - Première divergence : 06/1986
Available in english only.
Event Number : 53896
Facility : PERRY - State : OH
Unit : [1] - RX Type : [1] GE-6
Event Date : 02/25/2019 - Event Time : 00:24 [EST]
Initial PWR : 74 % Current PWR : 0 %
Event Text
AUTOMATIC REACTOR SCRAM DUE TO GENERATOR TRIP
"At 0024 EST on 2/25/19, with Unit 1 in Mode 1 at 74 percent power, the reactor automatically tripped due to a generator trip. The trip was not complex, with all systems responding normally post-trip.
"Operations responded and stabilized the plant. Reactor water level is being maintained via the feed system. Decay heat is being removed by discharging steam to the main condenser using the turbine bypass valves.
"Due to the Reactor Protection System actuation while critical, this event is being reported as a four-hour, non-emergency notification per 10 CFR 50.72(b)(2)(iv)(B).
"There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified."
The generator trip is under investigation, but is believed to be due to grid perturbations.
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2019/20190226en.html
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