ENS 51604

v t e ENS Event
05:29 Oct 21, 2015
Title	Diesel Generator Start Due to Invalid Signal
Event Description	This report is being made per paragraphs 50.73(a)(1) and 50.73(a)(2)(iv)(A) to address an actuation of Emergency Diesel Generator 'A' on October 21, 2015, during the performance of a Diesel Generator Load and Safeguard Sequence Test. The Emergency AC Electrical Power system, including Diesel Generators is a system named in 50.73(a)(2)(iv)(B). During the performance of the Diesel Generator Load and Safeguard Sequence Test restoration steps a human performance error, while taking resistance readings on a relay, resulted in the unintentional start of the 'A' Emergency Diesel Generator. The testing was aborted and the affected Diesel Generator was restored to standby service in accordance with plant procedures. This is defined as an 'invalid signal' in that the 'A' Diesel Generator did not start as the result of an actual initiating condition. The start signal is considered an INVALID signal with respect to 50.73(a)(2)(iv)(A), however the system was not fully removed from service. The 'B' train was not affected by this event. The actuation signal was considered complete since all necessary components responded as would have been expected if there had been a valid signal. The NRC Resident Inspector was notified. The licensee has determined that shorter test probe tips, when taking resistance readings, are necessary to prevent reoccurrence of this event.

ENS 51604 +/-
Where
Ginna New York (NRC Region 1)
Reporting

10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation
Time - Person (Reporting Time:+1304.05 h54.335 days <br />7.762 weeks <br />1.786 months <br />)
Opened:	Thomas Joachimczyk 14:32 Dec 14, 2015
NRC Officer:	John Shoemaker
Last Updated:	Dec 14, 2015
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v • d • e

v t e Emergency Notification System
Ginna with 10 CFR 50.73(a)(1), Submit an LER
WEEKMONTHYEAR2021-10-17T18:58:00 [Table view]
[ENS list for Ginna]

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