ENS 52295

v t e ENS Event
18:38 Oct 12, 2016
Title	Manual Reactor Trip Due to Spurious Feedwater Isolation
Event Description	At 1338 CDT, a spurious electrical fault on a unit substation motor control center caused a spurious feedwater isolation and required a manual reactor trip on Unit 2 Byron Station due to lowering steam generator level. Auxiliary feedwater automatically actuated to supply feedwater flow and is maintaining steam generator level within procedurally required levels. The motor control center fault resulted in feedwater isolations on two of four steam generators. All rods inserted during the trip. Decay heat is being removed via the steam dumps to condenser. Plant response to the trip was uncomplicated. Unit 2 is in a normal shutdown electrical lineup with power available from offsite. The grid is stable. Byron Station Unit 1 is at 95% power and stable and was unaffected by the transient on Unit 2. The cause of the motor control center fault is under investigation. The licensee has notified the NRC Resident Inspector and will be issuing a press release concerning the manual reactor trip.

ENS 52295 +/-
Where
Byron Illinois (NRC Region 3)
Reporting

10 CFR 50.72(b)(2)(iv)(B), RPS Actuation 10 CFR 50.72(b)(3)(iv)(A), System Actuation
LER:	05000455/LER-2016-001
Time - Person (Reporting Time:+-3.35 h-0.14 days <br />-0.0199 weeks <br />-0.00459 months <br />)
Opened:	Jim Lynde 15:17 Oct 12, 2016
NRC Officer:	Howie Crouch
Last Updated:	Oct 12, 2016
52295 - NRC Website
v • d • e

v t e Emergency Notification System
Byron with 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
WEEKMONTHYEAR2019-04-22T18:24:00 [Table view]
[ENS list for Byron]

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