ENS Event | |
|---|---|
05:24 Oct 20, 2012 | |
| Title | 60-Day Optional Telephonic Notification of Invalid Specified System Actuation |
| Event Description | In accordance with 10CFR50.73(a)(2)(iv)(A), this telephone notification reports an invalid actuation of the Unit 2 train B (2B) Emergency Diesel Generator (DG) undervoltage auxiliary relay on October 19, 2012 at 2324 hours0.0269 days <br />0.646 hours <br />0.00384 weeks <br />8.84282e-4 months <br />. At the time of he event, Unit 2 was in Mode 6, Refueling. The 2B DG was undergoing the completion of a monthly surveillance and was operating in parallel with the offsite power, when the 2B DG changed from the test mode to the emergency mode. The offsite feed to the bus (ACB 2422) tripped, and the 2B DG load increased to carry the bus. Proper operation of the 2B DG was verified, and expected train equipment loaded and functioned successfully. The potential cause is attributed to a spurious actuation of the undervoltage auxiliary relay. This condition was entered into the corrective action program.
The licensee notified the NRC Resident Inspector and the Illinois Emergency Management Agency Resident Inspector. |
| Where | |
|---|---|
Braidwood  Illinois (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+1253.77 h52.24 days <br />7.463 weeks <br />1.717 months <br />) | |
| Opened: | Zachary Montpetit 12:10 Dec 11, 2012 |
| NRC Officer: | Charles Teal |
| Last Updated: | Dec 11, 2012 |
| 48579 - NRC Website
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WEEKMONTHYEARENS 485792012-10-20T05:24:00020 October 2012 05:24:00
[Table view]10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification of Invalid Specified System Actuation ENS 430412006-10-30T11:37:00030 October 2006 11:37:00 10 CFR 50.73(a)(1), Submit an LER Inadvertent Opening of Two Isolation Valves 2012-10-20T05:24:00 | |