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The following information was provided by … The following information was provided by the licensee via phone and email:</br>At 0748 CST, on November 12, 2025, Callaway Plant experienced an automatic actuation of the auxiliary feedwater (AFW) system in response to auxiliary feedwater actuation signals (AFAS). A low suction pressure signal was also received which aligned the AFW pumps to essential service water (ESW). An unknown amount of water from the ultimate heat sink (UHS) entered the steam generators, necessitating a plant shutdown due to exceeding secondary water chemistry program action levels. During the shutdown, with the plant at approximately 28 percent power, high vibration was received on the main turbine, requiring a manual turbine trip. The cause of the AFAS is not yet known. The plant is currently stable in mode 3.</br>This condition is being reported as an eight-hour, non-emergency notification per 10 CFR 50.72(b)(3)(iv)(A). </br>There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified.</br>The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:</br>Decay heat is being removed via steam dump valves to the main condenser.</br>* * * RETRACTION ON NOVEMBER 20, 2025, AT 1409 EST FROM ZACH MILLIGAN TO JORDAN WINGATE * * *</br>The following is a summary of the retraction provided by the licensee via phone and email.</br>Event Notification 58035, made on November 12, 2025, pursuant to 10 CFR 50.72(b)(3)(iv)(A), is being retracted following a review of the cause of the auxiliary feedwater system's automatic actuation. The AFW system actuation was traced to a power supply malfunction, which also caused the auxiliary feedwater pumps to align with essential service water. Because the actuation resulted from a spurious power supply failure, rather than signals triggered by plant conditions or parameters meeting system initiation criteria, it is considered invalid and not reportable under 10 CFR 50.72(b)(3)(iv)(A).</br>The NRC Resident Inspector has been informed.</br>Notified R4DO (Drake)r has been informed.
Notified R4DO (Drake)
13:48:00, 12 November 2025 +
16:02:00, 12 November 2025 +
13:48:00, 12 November 2025 +
The following information was provided by … The following information was provided by the licensee via phone and email:</br>At 0748 CST, on November 12, 2025, Callaway Plant experienced an automatic actuation of the auxiliary feedwater (AFW) system in response to auxiliary feedwater actuation signals (AFAS). A low suction pressure signal was also received which aligned the AFW pumps to essential service water (ESW). An unknown amount of water from the ultimate heat sink (UHS) entered the steam generators, necessitating a plant shutdown due to exceeding secondary water chemistry program action levels. During the shutdown, with the plant at approximately 28 percent power, high vibration was received on the main turbine, requiring a manual turbine trip. The cause of the AFAS is not yet known. The plant is currently stable in mode 3.</br>This condition is being reported as an eight-hour, non-emergency notification per 10 CFR 50.72(b)(3)(iv)(A). </br>There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified.</br>The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:</br>Decay heat is being removed via steam dump valves to the main condenser.</br>* * * RETRACTION ON NOVEMBER 20, 2025, AT 1409 EST FROM ZACH MILLIGAN TO JORDAN WINGATE * * *</br>The following is a summary of the retraction provided by the licensee via phone and email.</br>Event Notification 58035, made on November 12, 2025, pursuant to 10 CFR 50.72(b)(3)(iv)(A), is being retracted following a review of the cause of the auxiliary feedwater system's automatic actuation. The AFW system actuation was traced to a power supply malfunction, which also caused the auxiliary feedwater pumps to align with essential service water. Because the actuation resulted from a spurious power supply failure, rather than signals triggered by plant conditions or parameters meeting system initiation criteria, it is considered invalid and not reportable under 10 CFR 50.72(b)(3)(iv)(A).</br>The NRC Resident Inspector has been informed.</br>Notified R4DO (Drake)r has been informed.
Notified R4DO (Drake)
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