ENS 47773

v t e ENS Event
02:00 Feb 2, 2012
Title	60-Day Optional Report - Invalid 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) on February 1, 2012, at 2100 hours0.0243 days <br />0.583 hours <br />0.00347 weeks <br />7.9905e-4 months <br />. At the time of the event, Unit 2 was in Mode 5, Cold Shutdown. The 2B DG was being prepared for an operability surveillance following a planned work window. As part of this surveillance, a chart recorder is installed to monitor key DG parameters to include the DG start signal. When the second lead was connected across the starting relay contact test point, a DC ground alarm was received and the 2B DG started. The engine functioned successfully and as expected, the 2B DG did not automatically connect to its safety bus, since no bus under-voltage signal was present. The cause is attributed to a faulty chart recorder in that an inadvertent ground resulted in the actuation of the starting relay. This condition was entered into the corrective action program. The licensee notified the NRC Resident Inspector.

ENS 47773 +/-
Where
Byron Illinois (NRC Region 3)
Reporting

10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation
Time - Person (Reporting Time:+1289.32 h53.722 days <br />7.675 weeks <br />1.766 months <br />)
Opened:	James Mcbreen 18:19 Mar 26, 2012
NRC Officer:	Donald Norwood
Last Updated:	Mar 26, 2012
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v • d • e

v t e Emergency Notification System
Byron with 10 CFR 50.73(a)(1), Submit an LER
WEEKMONTHYEAR2012-02-02T02:00:00 [Table view]
[ENS list for Byron]

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