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At 1132 hours (EST) on November 12, 2015, … At 1132 hours (EST) on November 12, 2015, Susquehanna Steam Electric Station Unit 1 reactor automatically scrammed due to one Main Steam Isolation Valve (MSIV) unanticipated closure causing a High Pressure RPS (Reactor Protection System) trip. </br>All control rods inserted and both reactor recirculation pumps tripped due to reactor water level 2. Reactor water level lowered to -37 inches causing Level 3 (+13 inches) and level 2 (-38 inches) (Division 2 only) isolations. RCIC (Reactor Core Isolation Cooling) automatically initiated and was overridden by control room operators after RPV (Reactor Pressure Vessel) water level was restored to the normal band with feedwater. All isolations and initiations occurred as expected. No main steam relief valves opened. Pressure was controlled via main turbine bypass valve operation. All safety systems operated as expected. </br>The Unit 1 reactor is currently stable in Mode 3. Investigation into the cause of the MSIV closure is underway.</br>Unit 2 was unaffected and continues power operation. </br>The NRC Resident Inspector has been notified. A voluntary notification to PEMA (Pennsylvania Emergency Management Agency) and press release will occur.</br>The plant is in its normal shutdown electrical lineup. in its normal shutdown electrical lineup. +
16:32:00, 12 November 2015 +
51,532 +
15:15:00, 12 November 2015 +
16:32:00, 12 November 2015 +
At 1132 hours (EST) on November 12, 2015, … At 1132 hours (EST) on November 12, 2015, Susquehanna Steam Electric Station Unit 1 reactor automatically scrammed due to one Main Steam Isolation Valve (MSIV) unanticipated closure causing a High Pressure RPS (Reactor Protection System) trip. </br>All control rods inserted and both reactor recirculation pumps tripped due to reactor water level 2. Reactor water level lowered to -37 inches causing Level 3 (+13 inches) and level 2 (-38 inches) (Division 2 only) isolations. RCIC (Reactor Core Isolation Cooling) automatically initiated and was overridden by control room operators after RPV (Reactor Pressure Vessel) water level was restored to the normal band with feedwater. All isolations and initiations occurred as expected. No main steam relief valves opened. Pressure was controlled via main turbine bypass valve operation. All safety systems operated as expected. </br>The Unit 1 reactor is currently stable in Mode 3. Investigation into the cause of the MSIV closure is underway.</br>Unit 2 was unaffected and continues power operation. </br>The NRC Resident Inspector has been notified. A voluntary notification to PEMA (Pennsylvania Emergency Management Agency) and press release will occur.</br>The plant is in its normal shutdown electrical lineup. in its normal shutdown electrical lineup. +
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