7 novembre 2017
Devant l’impossibilité de manoeuvrer manuellement le bouton poussoir de commande à distance d’arrêt de la turbine, l’injection de liquide de refroidissement haute pression (HPCI) de la ligne de vapeur a été isolé manuellement. Ce système n’étant pas doublé par un secours, en cas de problème de refroidissement du coeur, la limitation des conséquences d’un accident aurait été affectée.
Type : Fukushima 1 (BWR Mark 1) - Puissance : 2 957 MWth - Première divergence : 10 /1971 -
Available in english only
Event Number : 53059
Facility : QUAD CITIES - State : IL
Unit : [1] - RX Type : [1] GE-3 -
Event Date : 11/07/2017 - Event Time : 18:10 [CST]
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
Initial PWR : 100 % Current PWR : 100 %
Event Text UNIT 1 HIGH PRESSURE COOLANT INJECTION INOPERABLE
"On November 7, 2017 at 1810 [CST], Unit 1 High Pressure Coolant Injection (HPCI), was manually isolated following failure of the remote turbine trip pushbutton to function. Unit 1 HPCI Operability Testing was in progress to the point of securing the HPCI turbine with the remote manual pushbutton. The pushbutton failed to trip the turbine resulting in operator action to lower the flow controller setpoint and isolating the HPCI steam line. HPCI remains isolated and is Inoperable pending resolution of the Turbine Trip circuitry.
"This event is being reported as a condition that could have prevented fulfillment of a safety function in accordance with 10CFR50.72(b)(3)(v)(D). The HPCI system is a single train system and the loss of HPCI could impact the plant ability to mitigate the consequences of an accident. The Reactor Core Isolation Cooling (RCIC) system was confirmed operable.
"The NRC Senior Resident Inspector has been notified."
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2017/20171108en.html
La boutique
Informez vous