ENS 56120

v t e ENS Event
07:38 Sep 26, 2022
Title	Manual Reactor Trip Due to Reported Fire on Isophase Bus Duct
Event Description	The following information was provided by the licensee via fax email: At 0238 CDT on 9/26/2022 with Unit 2 in Mode 1 at 100 percent power, the reactor manually tripped due to a reported fire on the isophase bus duct. The trip was uncomplicated with all systems responding normally post-trip with the exception of the 2A reactor protection system power supply, which tripped and power was transferred to the alternate source. The fire was reported extinguished at 0240 CDT on 9/26/2022. Due to the reactor protection system actuation while critical, this event is being reported as a four-hour, non-emergency notification per 10 CFR 50.72(b)(2)(iv)(B). Operations responded using the emergency operating procedure LGA-001 and stabilized the plant in Mode 3. Decay heat is removed by discharging steam to the main condenser using the turbine bypass valves. Unit 1 is not affected. There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified.

ENS 56120 +/-
Where
LaSalle Illinois (NRC Region 3)
Reporting

10 CFR 50.72(b)(2)(iv)(B), RPS Actuation
LER:	05000374/LER-2022-003 Manual Scram Due to Lsophase Bus Duct Fire and 2A RPS Normal Power Supply Trip 05000374/LER-2022-003-01 Manual Scram Due to Lsophase Bus Duct Fire Followed by 2A RPS Normal Power Supply Trip 05000374/LER-2022-003-02 Manual Scram Due to Lsophase Bus Duct Fire Followed by 2A RPS Normal Power Supply Trip
Time - Person (Reporting Time:+-0.98 h-0.0408 days <br />-0.00583 weeks <br />-0.00134 months <br />)
Opened:	Jeff Nugent 06:39 Sep 26, 2022
NRC Officer:	Bill Gott
Last Updated:	Sep 26, 2022
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v • d • e

v t e Emergency Notification System
LaSalle with 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation
WEEKMONTHYEAR2025-12-28T22:06:00 [Table view]
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