ENS 45511
ENS Event | |
|---|---|
22:48 Sep 27, 2009 | |
| Title | Optional 60-Day Telephonic Notification for Invalid Specified System Actuation |
| Event Description | [This is a] telephone notification made under 10 CFR 50.73(a)(2)(iv)(A) in lieu of submitting written Licensee Event Report.
On September 27, 2009, following reactor shutdown and cooldown for a planned refueling outage, 4160 VAC Safeguard Bus 5 was being restored to normal electrical lineup. Emergency Diesel Generator (EDG) A was powering Bus 5 following successful completion of planned testing to satisfy Technical Specification requirements for testing of EDG automatic start, load shedding, and restoration, initiated by a simulated loss of all normal AC power. At 1648, while restoring Bus 5 to normal electrical lineup, breaker 1-503, Tertiary Auxiliary Transformer (TAT) supply to Bus 5, reopened after being closed. EDG A continued to supply Bus 5 without interruption. The following equipment tripped when breaker 1-503 opened: Residual Heat Removal (RHR) Pump A, Containment Fan Coil Units (CFCUs) A & B, Shield Building Ventilation (SBV) Fan A, and Service Water (SW) Pump A1. Auxiliary Feedwater (AFW) Pump A, Component Cooling (CC) Pump A, and SW Pump A2 were tripped and restarted by the blackout sequencer. All actuations were completed as designed and the components started and functioned successfully. AFW Train A had been properly removed from service for the EDG test and operated on minimum recirculation following AFW Pump A start. The equipment actuations resulted from an invalid signal caused by an electrical jumper for the blackout signal remaining installed during Bus 5 restoration. The jumper continued to inject a simulated loss of voltage (blackout) signal, causing the TAT supply breaker opening and load shedding and sequencer operation as designed. Inspection of breaker 1-503 was completed with no abnormalities noted. The jumper was removed and Bus 5 was restored to normal lineup. Corrective actions were initiated to revise the test procedure to more appropriately control bus restoration. Although the actuating signal that caused this event was invalid and the electrical bus had been appropriately aligned for the EDG test, this event is being reported because of the multiple and diverse components that were inadvertently actuated. The licensee has notified the NRC Resident Inspector. |
| Where | |
|---|---|
Kewaunee  Wisconsin (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+1264.95 h52.706 days <br />7.529 weeks <br />1.733 months <br />) | |
| Opened: | Jack Gadzala 16:45 Nov 19, 2009 |
| NRC Officer: | Howie Crouch |
| Last Updated: | Nov 19, 2009 |
| 45511 - NRC Website
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WEEKMONTHYEARENS 475722011-11-07T15:44:0007 November 2011 15:44:00
[Table view]10 CFR 50.73(a)(1), Submit an LER 60-Day Report Involving an Invalid Edg Actuation Due to Technician Error ENS 455112009-09-27T22:48:00027 September 2009 22:48:00 10 CFR 50.73(a)(1), Submit an LER Optional 60-Day Telephonic Notification for Invalid Specified System Actuation ENS 411522004-09-15T14:11:00015 September 2004 14:11:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Containment Isolation Valves 2011-11-07T15:44:00 | |