19 mars 2015
Suite à la perte récente des voies d’alimentation normale et secours, le réacteur ne fonctionnait que sur une voie. Le niveau d’eau au-dessus des barres combustible était de 3,4 m. La pression du réacteur était maintenue par les vannes de contournement de turbine et le condenseur.
Type : Fukushima I (BWR Mark 1) - Puissance : 3 430 MWth - Première divergence : 06/1985
Availble in english only.
Event Number : 50903
Facility : FERMI - State : MI -
Unit : [2] - RX Type : [2] GE-4
Event Date : 03/19/2015 - Event Time : 07:02
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL Initial PWR 70 % - Current PWR : 0 %
Event Text
AUTOMATIC REACTOR SCRAM DUE TO AN OSCILLATION POWER RANGE MONITOR UPSCALE ACTUATION
"At 0702 EDT on March 19, 2015, Fermi 2 received an automatic scram due to actuation of the Reactor Protection System (RPS) function of Oscillation Power Range Monitor (OPRM) Upscale. The plant had recently transitioned to Single Loop Operation after securing the ’A’ Reactor Recirculation Pump due to loss of normal and emergency cooling water supply. The lowest reactor water level was 134 inches above top of active fuel. Reactor water level is being maintained in the normal band by the Feedwater and Control Rod Drive Systems. No Safety Relief Valves (SRV) actuated. Reactor pressure is being maintained via the Main Turbine Bypass Valves and Main Condenser. Reactor Pressure Vessel Level 3 isolation occurred. No additional safety system actuations occurred. All off-site power sources were available throughout the event. The plant is currently in Mode 3 and in a stable condition. Investigation into the cause of the event is ongoing.
"This event is being reported under the four hour Non-Emergency reporting criteria of 10CFR50.72(b)(2)(iv)(B). The NRC Resident Inspector has been notified."
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2015/20150320en.html
La boutique
Informez vous