Waterford was shutdown mysteriously around Oct 25...
Power Reactor Event Number: 52321 Facility: WATERFORD
Region: 4 State: LA
Unit:  [ ] [ ]
RX Type:  CE
NRC Notified By: RYAN TREGRE
HQ OPS Officer: JEFF HERRERA
Notification Date: 10/27/2016
Notification Time: 08:26 [ET]
Event Date: 10/27/2016
Event Time: 00:21 [CDT]
Last Update Date: 10/27/2016
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(v)(A) - POT UNABLE TO SAFE SD
50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
THOMAS FARNHOLTZ (R4DO)
Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode 3 N N 0 Hot Standby 0 Hot Standby
LOSS OF CHARGING AND LETDOWN SYSTEMS FROM THE REACTOR COOLANT SYSTEM
"At 0021 [CDT] on 10/27/16, Waterford 3 (WF3) experienced a loss of the charging and letdown systems from the Reactor Coolant System (RCS). Technical Specification (TS) 3.0.3 was entered due to the loss of all three charging pumps. Charging Pump AB was restored and aligned to replace Charging Pump A and WF3 exited TS 3.0.3 at 0055 on 10/27/16.
"The cause of the loss of charging pumps was due to Refueling Water Storage Pool to Charging Pumps Suction Isolation, CVC-507, not opening as expected following a loss of Static Uninterruptible Power Supply (SUPS) 014AB during electrical troubleshooting. The cause of CVC-507 not opening is being investigated. Power was restored to SUPS 014AB at 0022.
"WF3 is currently stable in Mode 3 with decay heat being removed by the Steam Bypass Control System. Pressurizer Level was maintained throughout the event. WF3 was previously shut down for reasons unrelated to this event.
"The NRC Resident Inspector has been notified."
Valve CVC-183 closed when the power supply was lost. CVC-183 is the Volume Control Tank outlet isolation valve. Waterford 3 will remain in mode 3 until the issue has been corrected.