ML101390505
| ML101390505 | |
| Person / Time | |
|---|---|
| Site: | Robinson  |
| Issue date: | 05/12/2010 |
| From: | Carolina Power & Light Co |
| To: | NRC/RGN-II |
| Shared Package | |
| ML101390483 | List: |
| References | |
| Download: ML101390505 (1) | |
Text
Event Times and Operator Actions 3/28/2010 6:30 PM 3/28/2010 8:26 PM Unit Trip - Loss of E-2, B EDG Start and Load Loss of A Charging Pump due to loss of DS Bus, Loss of C Charging Pump due to lose of E-2 Loss of C CCW, B CCW starts on loss of Instrument Bus 4 C CCW starts on sequencer FCV-626 closes due loss of power event 18:58 Pressurizer Empty 19:12 VCT at lowest indicated level Charging Flow At 17.3 gpm 19:25 MSIVs automatically shut on loss of Instrument Bus 3 19:00 19:49 Secured B Charging Pump 20:12 VCT level back on scale SI Termination to ERO Deactivation May 10 - Draft Rev 11b 18:52 Crew Enters PATH-1 18:52 18:53 B and C Charging Pumps Started (PATH-1 Step)
Auto SI on Low Pressurizer Press C Charging Pump Trips on SI LT-115 12.22 in.
LT-112 12.07 in.
Auto Swap to RWST should have occurred B Charging Pump remains running at 18.1 gpm Transition to back to PATH-1 Entry Point A 18:56 Transition to EPP-4. BOP Performing AOP-041 for fire response 19:03 SI Injection begins to the RCS 19:13 SI no longer injecting to the RCS 19:19 Indicated Charging flow increases to 25 gpm based on CS-310A 19:31 PZR level comes back on scale 19:31 FCV-626 Opened based on PATH-1 Step 19:24 B RCP Bearing Hi Temp Alarm 19:30 A RCP Bearing Hi Temp Alarm 19:33 B RCP #1 Seal Leak-off Hi Temp Alarm 19:33 C RCP Bearing Hi Temp Alarm 19:37 Indicated Charging flow is lost based on VCT Outlet Temp and Charging Pump Header Pressure 19:36 A RCP Bearing Hi Temp Alarm Clears 19:42 C RCP Bearing Hi Temp Alarm Clears 19:44 B RCP Bearing Hi Temp Alarm Clears 19:45 PZR Level
>14%
19:46 Crew identifies failure of RWST Auto Swap and loss of Charging flow 19:51 Realigned Charging Pump Suction to RWST 19:53 Started C Charging Pump 20:05 B RCP
- 1 Seal Leak-off Hi Temp Alarm Clears 20:20 VCT level
>12.4 in.
19:34 AOP-18 Entered for RCP Conditions 18:40 Before Trip:
C Component Cooling Water, A & C Charging Pumps Operating 3/28/2010 8:26 PM 3/29/2010 2:00 AM 20:44 Safety Injection Pumps Secured 21:25 Transition from EPP-7 to GP-004 20:24 Transition to EPP-7 for SI Termination 20:49 Letdown placed back in service 21:32 Phone call to Control Room from Transmission Reporting Unit Aux Transformer Fault and Oil leak 22:34 Reset of Main Generator Lockout Relay (86P)
Initiation of the second fire event 22:40 Positive indication Grounds on both A And B DC Buses Reported to Control Room 23:00 ALERT Declared 23:12 Notifications made to State and Counties 23:29 ERO Activated 00:00 OSC Activated 00:15 EOF and TSC Activated 00:54 JIC Activated 01:34 Event Terminated 01:46 ERO Facilities Deactivated 18:55 SM and STA come to Main Control Room.
Report Fire in 4 KV Bus 5 18:54 PZR Level At 14%, Letdown Isolates