12 décembre 2017
Ce sont des problèmes de continuité des connections au niveau des batteries qui sont à l’origine de la perte d’injection haute pression. La limitation des conditions d’opération du coeur ( LCOs [Limiting condition of operation] ) a alors été déclarée. Des recherches de défauts sont menées au niveau des batteries.
type : BWR Mark 3 - Puissance :4 408 MWth - Première divergence : 8 / 1982 -
Available in english only
Event Number : 53117
Facility : GRAND GULF - Region : 4 State : MS Unit : [1] - RX Type : [1] GE-6
Event Date : 12/12/2017 Event Time : 13:30 [CST]
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(3)(v)(D) - ACCIDENT MITIGATION Person (Organization) : RICK DEESE (R4DO)
Initial PWR : 15 % Current PWR : 15 %
Event Text
HIGH PRESSURE CORE SPRAY DECLARED INOPERABLE
"At approximately 1330 CST on Tuesday, December 12, 2017, Grand Gulf Nuclear Station declared Division 3 ’C’ Battery inoperable due to questions concerning battery terminal connection continuity. Technical Specification 3.8.4, DC Sources - Operating, Condition E, Required Action E.1, requires the station to declare the High Pressure Core Spray System inoperable immediately. The Division 3 ’C’ Battery and High Pressure Core Spray System was declared operable and the LCOs [Limiting condition of operation] were declared met at 1731CST on Tuesday, December 12, 2017. Based on field measurements of terminal torque and resistance, the as-found and as-left terminal resistance micro-ohm readings indicated satisfactorily all times. Formal evaluation of the as-found condition of the battery is in progress.
"This report is to notify the NRC of a loss of safety function on the High Pressure Core Spray System."
The NRC Resident Inspector was notified.
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2017/20171213en.html
La boutique
Informez vous