7 novembre 2017
Les systèmes d’alimentation auxiliaires en eau ont été activés et sont maintenus en service. L’alimentation électrique extérieure est disponible et alimente les bus électriques normaux et de secours. Les deux systèmes de contrôle d’activité du coeur n’ont pas donné d’information sur la situation du coeur malgré divers essais et ont été déclarés hors service. Les mouvements de retrait des barres de contrôle ont alors été bloqués ainsi que toutes les voies de dilution.
Type : PWR - Puissance : 2 900 MWth - Première divergence : 2 / 1976 -
Avalaible in english only
Event Number : 53056
Facility : BEAVER VALLEY
State : PA - Unit : [1]
RX Type : [1] W-3-LP
Event Date : 11/07/2017 - Event Time : 05:04 [EST]
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
UNIT 1 AUTOMATIC REACTOR TRIP DUE TO MAIN UNIT GENERATOR OVER CURRENT
"On November 7, at 0504 [EST], BVPS [Beaver Valley Power Station] Unit 1 experienced an automatic reactor trip due to Main Unit Generator over current. The Auxiliary Feedwater system activated and remains in service. Offsite power supply is available. Normal and Emergency busses are being supplied by Offsite power. One Source Range channel failed to energize due to its corresponding Intermediate Range instrument being under compensated. It was manually energized and is not indicating as expected. The second Source Range instrument energized but is reading erratically. Both Source Range instruments have been declared inoperable and the appropriate Technical Specification has been complied with by making the Control Rods not capable of withdrawal and isolating all dilution flow paths. Plant trip response was as expected without complications, and all control rods fully inserted in the core. The plant is currently stable in Mode 3.
"This event is being reported as an actuation of the Reactor Protection system 10 CFR 50.72(b)(2)(iv)(B) and a Specified System Actuation (Auxiliary Feedwater System) 10 CFR 50.72(b)(3)(iv)(A).
"BVPS Unit 2 is unaffected by this event and remains at 100% power in Mode 1.
"The NRC Resident Inspector has been notified."
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2017/20171108en.html