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The following information was provided by … The following information was provided by the licensee via phone and email:</br>On February 15, 2025 at 2240 CST, Grand Gulf Nuclear Station (GGNS) was operating in mode 1 at 84 percent reactor power when a (manual) reactor protection system (RPS) actuation (scram) occurred due to degrading condenser vacuum. All control rods inserted, there were no complications, and all plant systems responded as designed. Immediately after the scram, an expected reactor water level 3 isolation signal was received.</br>Reactor pressure is being maintained via the main turbine bypass valves. Reactor level is being maintained via condensate and main feedwater. GGNS is currently in mode 3. No radiological releases have occurred due to this event.</br>This event is being reported under 10 CFR 50.72(b)(2)(iv)(B) and 10 CFR 50.72(b)(3)(iv)(A), as an event or condition that results in actuation of the RPS when the reactor is critical and as a specified system actuation due to the expected reactor water level 3 isolation signal immediately following the reactor scram.</br>The NRC Senior Resident Inspector has been notified.</br>The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:</br>The loss of condenser vacuum was due to loss of power to the seal steam controller.oss of power to the seal steam controller. +
04:40:00, 16 February 2025 +
57,551 +
03:09:00, 16 February 2025 +
04:40:00, 16 February 2025 +
The following information was provided by … The following information was provided by the licensee via phone and email:</br>On February 15, 2025 at 2240 CST, Grand Gulf Nuclear Station (GGNS) was operating in mode 1 at 84 percent reactor power when a (manual) reactor protection system (RPS) actuation (scram) occurred due to degrading condenser vacuum. All control rods inserted, there were no complications, and all plant systems responded as designed. Immediately after the scram, an expected reactor water level 3 isolation signal was received.</br>Reactor pressure is being maintained via the main turbine bypass valves. Reactor level is being maintained via condensate and main feedwater. GGNS is currently in mode 3. No radiological releases have occurred due to this event.</br>This event is being reported under 10 CFR 50.72(b)(2)(iv)(B) and 10 CFR 50.72(b)(3)(iv)(A), as an event or condition that results in actuation of the RPS when the reactor is critical and as a specified system actuation due to the expected reactor water level 3 isolation signal immediately following the reactor scram.</br>The NRC Senior Resident Inspector has been notified.</br>The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:</br>The loss of condenser vacuum was due to loss of power to the seal steam controller.oss of power to the seal steam controller. +
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