ENS 55549

v t e ENS Event
18:29 Oct 27, 2021
Title	Automatic Actuation of the 1B EDG Load Sequencer on Bus Undervoltage Condition
Event Description	At 1429 EDT on October 27, 2021 with Unit 1 in Mode 6 at 0 percent power, the 1B Emergency Diesel Generator (EDG) Load Sequencer was actuated by a valid undervoltage condition on the 1B 4160V Essential Bus that occurred during 1B Sequencer calibration activities. Valid signals were sent to both the 1B EDG and Unit 1 Auxiliary Feedwater (CA) systems. Neither system automatically started as they were both removed from service for maintenance activities at the time. This event is being reported in accordance with 10 CFR 50.72(b)(3)(iv)(A) as an event that results in a valid actuation of the 1B EDG and Unit 1 CA systems. There was no impact to the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified.

ENS 55549 +/-
Where
Catawba South Carolina (NRC Region 2)
Reporting

10 CFR 50.72(b)(3)(iv)(A), System Actuation
LER:	05000413/LER-2021-005 Automatic Actuation of the 1B Emergency Diesel Generator Load Sequencer on Bus Under-voltage Condition
Time - Person (Reporting Time:+2.17 h0.0904 days <br />0.0129 weeks <br />0.00297 months <br />)
Opened:	Michael James 20:39 Oct 27, 2021
NRC Officer:	Donald Norwood
Last Updated:	Oct 27, 2021
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v • d • e

v t e Emergency Notification System
Catawba with 10 CFR 50.72(b)(3)(iv)(A), System Actuation
WEEKMONTHYEAR2024-09-27T11:46:00 [Table view]
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