ENS 50720

v t e ENS Event
04:55 Nov 16, 2014
Title	Invalid Actuation of 1A Emergency Diesel Generator (Edg)
Event Description	This 60-day telephone notification is being made under the reporting requirements specified by 10 CFR 50.73(a)(2)(iv)(A) and 10 CFR 50.73(a)(1) to describe an invalid actuation of the 1A EDG. The 1A EDG start resulted from a degraded component during the testing of the 1A Emergency Load Sequencer. At 2355 [EST] on November 15, 2014, the 1A EDG auto started during performance of the monthly 1A Emergency Load Sequencer test. The test was terminated by personnel prior to a full actuation of the Emergency Load Sequencer due to the unexpected response of the sequencer. The 1A EDG started and functioned normally. Troubleshooting identified a degraded relay downstream of the under voltage sensing circuit which made up the invalid 2/3 logic necessary to start the EDG. There were NO actual plant conditions or parameters (i.e. under voltage, degraded voltage, safety injection or manual initiation) involved in this actuation. The degraded relay would NOT have prevented the 1A Emergency Load Sequencer or the EDG from performing their safety related functions. Following troubleshooting, replacement of the relay and an evaluation for extent of condition, the 1A Emergency Load Sequencer and EDG were returned to service. The health and safety of the public was not affected by this issue. The NRC Resident Inspector has been notified.

ENS 50720 +/-
Where
Mcguire North Carolina (NRC Region 2)
Reporting

10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation
Time - Person (Reporting Time:+1255.53 h52.314 days <br />7.473 weeks <br />1.72 months <br />)
Opened:	Scott Slieter 12:27 Jan 7, 2015
NRC Officer:	Daniel Mills
Last Updated:	Jan 7, 2015
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v • d • e

v t e Emergency Notification System
McGuire with 10 CFR 50.73(a)(1), Submit an LER
WEEKMONTHYEAR2023-01-01T11:04:00 [Table view]
[ENS list for McGuire]

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