28 août 2017
La turbine est elle même tombée suite à celle du générateur principal qui lui-même s’est arrêté sur un défaut sur le parafoudre du transformateur principal. La commutation de l’alimentation électrique alternative se serait passée sans problème et les barres de contrôle se sont insérées correctement dans le cœur. Le personnel recherche la cause du défaut sur le parafoudre.
Type : PWR - Puissance : 2 900 MWth - Première divergence : 10 / 1982 -
Available in english only
Event Number : 52932
Facility : SUMMER
State : SC
Unit : [1] - RX Type : [1] W-3-LP
Event Date : 08/28/2017 - Event Time : 08:37 [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 : 100 % Current PWR : 0 %
Event Text AUTOMATIC REACTOR TRIP ON TURBINE TRIP
"On 8/28/2017 at 0837 [EDT], VC Summer Nuclear Station automatically tripped due to a turbine trip. The turbine trip was caused by the Main Generator Differential Lockout due to a fault on the center phase lightning arrester on the Main Transformer (XTF-001).
"There were no complications with the trip. All control rods fully inserted. Balance of Plant (BOP) buses automatically transferred to their alternate power source XTF 31/32. All Emergency Feedwater pumps started as required. All systems responded as required. The plant is stable in Mode 3. Station personnel are investigating the cause of the fault on the main transformer lightning arrester.
"This event is reportable per 10 CFR 50. 72(b)(2)(iv)(B) and 10 CFR 50. 72(b)(3)(iv)(A).
"The NRC Resident Inspector has been notified."
The unit is currently stable in Mode 3 with decay heat removal via the Main Steam to the Main Condenser.
The licensee will inform both State and local authorities.
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2017/20170829en.html
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