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On August 21, 2020 at 0908 CDT, River Bend … On August 21, 2020 at 0908 CDT, River Bend Station was operating at 100% reactor power when reactor recirculation pump 'B' tripped. At 0918 CDT, a manual reactor scram was inserted at 67% reactor power after receiving indications of thermal hydraulic instability as indicated by flux oscillations on the period based detection system (PBDS) and average power range monitors (APRMs). All control rods fully inserted and there were no complications. All systems responded as designed. Currently River Bend Station Unit 1 is stable and pressure is being maintained using turbine bypass valves.</br>This event is being reported under 10 CFR 50.72(b)(2)(iv)(B), as any event or condition that results in actuation of the reactor protection system (RPS) when the reactor is critical and 10 CFR 50.72 (b)(3)(iv)(A) Specified System Actuation as result of Group 3 isolations.</br>NRC Resident Inspector has been briefed on this event.</br>No radiological releases have occurred due to this event from the unit. occurred due to this event from the unit. +
14:18:00, 21 August 2020 +
54,849 +
12:53:00, 21 August 2020 +
14:18:00, 21 August 2020 +
On August 21, 2020 at 0908 CDT, River Bend … On August 21, 2020 at 0908 CDT, River Bend Station was operating at 100% reactor power when reactor recirculation pump 'B' tripped. At 0918 CDT, a manual reactor scram was inserted at 67% reactor power after receiving indications of thermal hydraulic instability as indicated by flux oscillations on the period based detection system (PBDS) and average power range monitors (APRMs). All control rods fully inserted and there were no complications. All systems responded as designed. Currently River Bend Station Unit 1 is stable and pressure is being maintained using turbine bypass valves.</br>This event is being reported under 10 CFR 50.72(b)(2)(iv)(B), as any event or condition that results in actuation of the reactor protection system (RPS) when the reactor is critical and 10 CFR 50.72 (b)(3)(iv)(A) Specified System Actuation as result of Group 3 isolations.</br>NRC Resident Inspector has been briefed on this event.</br>No radiological releases have occurred due to this event from the unit. occurred due to this event from the unit. +
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00:00:00, 21 August 2020 +
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16:25:37, 15 January 2021 +
12:53:00, 21 August 2020 +
-0.0592 d (-1.42 hours, -0.00845 weeks, -0.00195 months) +
14:18:00, 21 August 2020 +
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