23 février 2019
Les systèmes de protection du réacteur, qui était à pleine puissance, ont été activés. Les barres de contrôles sont insérées dans le cœur et la pression est contrôlée par les vannes de bypass de la turbine vers le condenseur principal. L’origine de l’activation intempestive de la vanne est en cours de recherche.
Type : BWR Mark3 - Puissance : 3 898 MWth - Première divergence : 08 / 1982 -
Available in english only
Event Number : 53894
Facility : GRAND GULF - State : MS Unit : [1] - RX Type : [1] GE-6
Event Date : 02/23/2019 - Event Time : 14:58 [CST]
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 : 100 % Current PWR : 0 %
Event Text
AUTOMATIC REACTOR SCRAM AFTER TURBINE CONTROL VALVE FAST CLOSURE
"Actuation of RPS [Reactor Protection System] with the reactor critical. Reactor scram occurred at 1458 [CST] on 2/23/2019 from 100% power. The cause of the scram was due to Turbine Control Valve Fast Closure.
"All control rods are fully inserted. Currently reactor water level is being maintained by the Condensate Feedwater System in normal band and reactor pressure is being controlled via Main Turbine Bypass valves to the main condenser. No ECCS [Emergency Core Cooling System] initiation signals were reached and no ECCS or Diesel Generator initiation occurred.
"The Low-Low Set function of the Safety Relief Valves actuated upon turbine trip. This was reset when pressure was established on main turbine bypass valves.
"The cause of the turbine trip is still under investigation.
"There were no complications with scram response."
The licensee notified the NRC Resident Inspector.
There was no maintenance occurring on the main turbine at the time of the scram.
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2019/20190225en.html
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