7 novembre 2017
Les barres de contrôle se sont insérées correctement dans le cœur. L’origine du problème est en cours de recherche. Lors d’une mise à jour du lendemain, la NRC précise que la vanne d’isolement du générateur de vapeur "B" n’est pas apparu comme fermée automatiquement et l’affichage de son état sur le tableau de contrôle principal fût long à obtenir.
Type : PWR - Puissance : 2 900 MWth - Première divergence : 10 / 1982 -
Available in english only
Event Number : 53060
Facility : SUMMER - 2 State : SC Unit : [1] - RX Type : [1] W-3-LP,
Event Date : 11/07/2017 - Event Time : 19:57 [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 AUTOMATIC REACTOR TRIP ON TURBINE TRIP
"On 11/7/2017 at 1957 [EST], VC Summer Nuclear Station automatically tripped due to a turbine trip. The cause of the turbine trip is under investigation at this time.
"All systems responded as expected. All Control Rods fully inserted and all Emergency Feedwater pumps started as required. The plant is stable in Mode 3.
"This event is reportable per 10 CFR 50.72(b)(2)(iv)(B) and 10 CFR 50.72(b)(3)(iv)(A).
"The unit is currently stable in Mode 3 with decay heat removal via the Main Steam to the Main Condenser.
"The NRC Resident Inspector has been notified."
The licensee will notify the South Carolina State Emergency Management Division, the Fairfield, Richland, Lexington and Newberry Counties
* * * UPDATE FROM BETH DALICK TO VINCE KLCO ON 11/8/17 AT 1409 EST * * *
"All systems responded as expected, with the exception of ’B’ Steam Generator Feedwater Isolation Valve XVG1611 B-FW. This valve did not appear to automatically close and was slow to indicate closed from the Main Control Board. All Control Rods fully inserted and all Emergency Feedwater pumps started as required. The plant is stable in Mode 3."
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2017/20171108en.html