17 février 2018
Ce bus alimente les auxiliaires d’un groupe électrogène, parmi lesquels le disjoncteur du chargeur de batterie. Le défaut de ce chargeur compromet l’injection de liquide à haute presion dans le coeur qui est un système unique au bon fonctionnement indispensable. La déclaration est faite suite à la survenue d’un évènement susceptible d’empêcher l’accomplissement d’une fonction de sécurité visant à limiter les conséquences d’un accident.
Type : BWR Mark 2 - Puissance : 3 456 MWth - Première divergence : 06/1982
Available in english only.
Event Number : 53219
Facility : LASALLE - State : IL
Unit : [1] - RX Type : [1] GE-5
Event Date : 02/17/2018 - Event Time : 02:00 [CST]
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
Initial PWR : 94 % Current PWR : 94 %
Event Text
DAMAGED BUS BAR IDENTIFIED POTENTIALLY AFFECTING HIGH PRESSURE CORE SPRAY
"This report is being made in accordance with 10 CFR 50.72(b)(3)(v)(D) for an event or condition that could have prevented fulfillment of a safety function needed to mitigate the consequences of an accident.“ While troubleshooting an issue with the Unit 1B Diesel Generator Oil Circulating pump, damage of a bus bar was identified at the breaker that supplies the Unit 1B Diesel Generato”r Auxiliaries. One of the loads fed from this breaker is the Division 3 DC Battery Charger. It has been determined that the degradation of the bus bar may have prevented the Division 3 DC Battery Charger from performing its function which could have prevented the High Pressure Core Spray System (HPCS) from performing its design safety function. Since HPCS is a single train safety system, it has been determined that this failure could potentially affect the safety function of this system, and is reportable as an 8 hour notification."
The NRC Resident Inspector has been notified.
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2018/20180220en.html