15 novembre 2014
Pendant le démarrage du réacteur, lors du contrôle du retrait des barres de contrôle, l’indication était de 50 pas pour une réalité de 90 pas suite à un problème de mesure de position. Les opérateurs ont donc lancé la procédure de mauvais fonctionnement des barres et ont ouvert les disjoncteurs de ces barres. Toutes les barres se sont insérées correctement.
Type : PWR - Puissance : 2 775 MWth - Première divergence : 05/1981
Available in english only.
Event Number : 50618
Facility : FARLEY - State : AL -
Unit : [2] - RX Type : [2] W-3-LP
Event Date : 11/15/2014 - Event Time : 03:53
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode 2 N N 0 Startup 0 Hot Standby
Event Text
VALID ACTUATION OF THE REACTOR PROTECTION SYSTEM FOR ABNORMAL ROD POSITION INDICATION
"This notification is being made as required by 10CFR 50.72(b)(3)(iv)(A) due to control room operators opening the Farley Nuclear Plant Unit 2 reactor trip breakers via the main control board hand switch during reactor startup procedures. This is a valid actuation of the reactor protection system. The reactor was not critical at the time the reactor trip breakers were opened.
"While withdrawing control rods for reactor startup and low power physics testing with control bank C at approximately 50 steps, Digital Rod Position indication for one of the control rods (M12) changed to 90 steps. The control room operators stopped withdrawing rods and entered FNP-2-AOP-19 (Malfunction of the Rod Control System). The reactor trip breakers were opened at 0353 CST. All rods inserted as expected. All other systems functioned normally. The plant is stable at normal operating pressure and temperature.
"The NRC Resident Inspector has been notified."
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2014/20141117en.html#en50618
La boutique
Informez vous