ENS 53623

v t e ENS Event
05:00 Sep 26, 2018
Title	Undervoltage Condition Initiates an Automatic Start of the Diesel Generator
Event Description	At 0946 CDT on 9/26/2018, a disruption in power to the offsite 138 kV line and the subsequent trip of the Emergency Reserve Auxiliary Transformer (ERAT) Static VAR Compensator (SVC) resulted in a degraded voltage signal on the Division 1- 4.16 kV safety bus. The degraded voltage signal resulted in a trip of the ERAT feed to the bus, blocking closure of the 345 kV Reserve Auxiliary Transformer (RAT) feed to the bus and auto start of the Division 1 Emergency Diesel Generator (EDG). The Division 1 EDG successfully started and re-energized the Division 1- 4.16 kV bus as designed. The unit is stable with the Division 1 EDG carrying the Division 1- 4.16 kV bus. The Ameren Transmission System Operator in St. Louis, MO informed the station that they had received a report that a 138 kV to 13.8 kV transformer at Clinton Route 54 substation was on fire and the South feed to the Tabor substation cycled as a result of this fault. The NRC Resident Inspector and Illinois Emergency Management Agency Resident Inspector have been notified.

ENS 53623 +/-
Where
Clinton Illinois (NRC Region 3)
Reporting

10 CFR 50.72(b)(3)(iv)(A), System Actuation
Time - Person (Reporting Time:+10.17 h0.424 days <br />0.0605 weeks <br />0.0139 months <br />)
Opened:	Patrick Selzer 15:10 Sep 26, 2018
NRC Officer:	Vince Klco
Last Updated:	Sep 26, 2018
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v • d • e

v t e Emergency Notification System
Clinton with 10 CFR 50.72(b)(3)(iv)(A), System Actuation
WEEKMONTHYEAR2019-08-03T07:26:00 [Table view]
[ENS list for Clinton]

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