29 octobre 2014
Arrêt manuel d’urgence du réacteur en cours de démarrage à 1 % de sa puissance et avec le cœur critique. Le niveau d’eau du réacteur commençait à baisser. Les barres de contrôle se sont correctement insérées dans le cœur et tous les systèmes ont réagi comme prévu. Le problème est déclaré suite à l’activation des systèmes de protection du cœur du réacteur et la cause de sa survenue en cours de recherche.
Type : Fukushima I (BWR Mark I) - Puissance MWth : 1 930 MWth - Première divergence : 05/1969 (soit 45 ans)
Available in english only.
Event Number : 50524
Facility : OYSTER CREEK - 1 State : NJ
Unit : [1] - RX Type : [1] GE-2
Event Date : 10/12/2014 - Event Time : 02:51 Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL Person (Organization) : FRED BOWER (R1DO) Initial PWR : 1 % Current PWR : 0 %
Event Text
AUTOMATIC REACTOR SCRAM DUE TO DECREASING REACTOR WATER LEVEL
"Today at approximately 0250 (EDT) [on 10/12/14], during a planned reactor power ascension with reactor power at approximately 1% of rated thermal power, reactor water level began lowering. Operators inserted a manual SCRAM at 0251 (EDT) in accordance with station procedures. The cause of the lowering reactor level is currently under investigation. "All rods inserted into the core and all systems functioned as expected during the scram. No electromatic (EMRVs) or safety relief valves lifted during the transient. The plant is currently shutdown and plant parameters are stable. "This event is reportable per 10CFR50.72(b)(2)(iv)(B) - ’any event or condition that results in actuation of the reactor protection system (RPS) when the reactor is critical except when the actuation results from and is part of a pre-planned sequence during testing or reactor operation.’" Decay heat is being released to the main condenser and normal offsite power is being maintained. The licensee has notified the NRC Resident Inspector. * * * UPDATE PROVIDED BY JOSH MCGUIRE TO JEFF ROTTON AT 1520 EDT ON 10/17/2014 * * * "An automatic SCRAM occurred at 0251 EDT, moments before operators inserted a manual SCRAM in accordance with station procedures." The licensee notified the NRC Resident Inspector. Notified R1DO (Cook).
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2014/20141020en.html