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The following information was provided by … The following information was provided by the licensee via phone and email:</br>At 1045 CDT on May 19, 2025, with Unit 1 at 100 percent power, the reactor was manually tripped on lowering reactor water level caused by a loss of electrical power to the condensate and feedwater pumps. The trip was not complex with all systems responding as expected post-trip. 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) and an eight-hour, non-emergency notification per 10 CFR 50.72(b)(3)(iv)(A) for the group II isolation, group III isolation, and Unit I emergency diesel generator (EDG) automatic start.</br>Operations responded using emergency operating procedures and stabilized the plant in hot shutdown. Decay heat is being removed through the automatic depressurization system and the residual heat removal system. </br>Coincident with the transient on Unit 1, Unit 2 experienced a trip of a reactor feed pump resulting in a runback of the reactor recirculation pumps. Unit 2 is currently stable at 80 percent power.</br>There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector and the Illinois Emergency Management Agency were notified.</br>The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:</br>On Unit 1, all control rods fully inserted on the scram and outboard main steam isolation valves closed on a loss of power.</br>The initial bus trip was caused by control power perturbations due to a ground on the associated battery system.</br>* * * UPDATE ON 5/20/2025 AT 1200 EDT FROM MATTHEW FRITCH TO SAMUEL COLVARD * * *</br>Based on additional investigation, it has not been confirmed that the initial bus trip was caused by a ground on the associated battery system. The cause remains under investigation.</br>Notified R3DO (Szwarc)</br>* * * UPDATE ON 5/22/2025 AT 1532 EDT FROM CONNER BEALER TO TENISHA MEADOWS * * *</br>The scram was initially reported as manual; however, further investigation determined that it was automatically initiated.</br>Notified R3DO (Szwarc)atically initiated.
Notified R3DO (Szwarc)
15:45:00, 19 May 2025 +
15:09:00, 19 May 2025 +
15:45:00, 19 May 2025 +
The following information was provided by … The following information was provided by the licensee via phone and email:</br>At 1045 CDT on May 19, 2025, with Unit 1 at 100 percent power, the reactor was manually tripped on lowering reactor water level caused by a loss of electrical power to the condensate and feedwater pumps. The trip was not complex with all systems responding as expected post-trip. 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) and an eight-hour, non-emergency notification per 10 CFR 50.72(b)(3)(iv)(A) for the group II isolation, group III isolation, and Unit I emergency diesel generator (EDG) automatic start.</br>Operations responded using emergency operating procedures and stabilized the plant in hot shutdown. Decay heat is being removed through the automatic depressurization system and the residual heat removal system. </br>Coincident with the transient on Unit 1, Unit 2 experienced a trip of a reactor feed pump resulting in a runback of the reactor recirculation pumps. Unit 2 is currently stable at 80 percent power.</br>There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector and the Illinois Emergency Management Agency were notified.</br>The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:</br>On Unit 1, all control rods fully inserted on the scram and outboard main steam isolation valves closed on a loss of power.</br>The initial bus trip was caused by control power perturbations due to a ground on the associated battery system.</br>* * * UPDATE ON 5/20/2025 AT 1200 EDT FROM MATTHEW FRITCH TO SAMUEL COLVARD * * *</br>Based on additional investigation, it has not been confirmed that the initial bus trip was caused by a ground on the associated battery system. The cause remains under investigation.</br>Notified R3DO (Szwarc)</br>* * * UPDATE ON 5/22/2025 AT 1532 EDT FROM CONNER BEALER TO TENISHA MEADOWS * * *</br>The scram was initially reported as manual; however, further investigation determined that it was automatically initiated.</br>Notified R3DO (Szwarc)atically initiated.
Notified R3DO (Szwarc)
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