2 mai 2017
Cet arrêt s’est produit suite à l’impossibilité d’enclencher le disjoncteur de la pompe de refroidissement du réacteur pendant la phase de démarrage. Devant ce problème, le système de refroidissent auxiliaire s’est enclenché et les systèmes de protection ont réagi correctement.
Type : PWR - Puissance : 3 459 MWth - Première divergence : 01 / 01 / 1996 -
Available in english only
Event Number : 52725
Facility : WATTS BAR
State : TN
Unit : [1] - RX Type : [1] W-4-LP -
Event Date : 05/02/2017 - Event Time : 19:45 [EDT]
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 : 26 % - Current PWR : 0 %
Event Text
MANUAL REACTOR TRIP DUE TO FAILED REACTOR COOLANT PUMP POWER TRANSFER
"On May 2nd, 2017, at 1945 EDT, Watts Bar Nuclear [WBN] Plant Unit 1 reactor was manually tripped due to a failure of the #3 Reactor Coolant Pump normal feeder breaker to close during the planned power transfer to unit power following startup. Concurrent with the reactor trip, the Auxiliary Feedwater system actuated as designed.
"All control and shutdown rods fully inserted. All safety systems responded as designed. The unit is currently stable in Mode 3, with decay heat removal via auxiliary feedwater and main steam dump systems. Unit 1 is in a normal shutdown electrical alignment.
"This reactor trip and system actuation is being reported under 10CFR 50.72(b)(3)(iv)(A) and 10CFR 50.72 (b)(2)(iv)(B).
"There was no effect on WBN Unit 2.
"The NRC Senior Resident [Inspector] has been notified."
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2017/20170503en.html
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