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Preliminary Notification (PN) Reports for 2012

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December
PNO-III-12-018A 12/12/2012 NextEra Energy Duane Arnold, LLC: Unplanned Shutdown Expected to Last Greater Than 72 Hours Due to Electrical Ground Detected on the Main Generator Field – (Update)
PNO-IV-2012-005A 12/04/2012 Uranium One USA, Inc.: Uranium Concentrate (Yellowcake) Released Upon Handling of Product Drum Shipped by Uranium One USA to a Fuel Services Refinery in Ontario, Canada, Resulting in Exposure to Workers – (Update)
PNO-III-12-018 12/03/2012 NextEra Energy Duane Arnold, LLC: Unplanned Shutdown Expected to Last Greater Than 72 Hours Due to Electrical Ground Detected on the Main Generator Field

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November
PNO-III-12-017 11/29/2012 FirstEnergy Nuclear Operating Company, Perry Nuclear Power Plant: Unusual Event Declared after Carbon Monoxide Detectors Alarmed in the Radwaste Building Control Room
PNO-I-12-008A 11/28/2012 Entergy Nuclear Operations, Inc.: James A. Fitzpatrick Nuclear Power Plant Notification of Unusual Event Due to Fire in Main Transformer – (Update)
PNO-IV-12-007A 11/21/2012 Entergy Operations, Inc.: Grand Gulf Nuclear Station Security Officer Lockout – (Update)
PNO-I-12-007A 11/14/2012 Exelon Generation Company, LLC; PSEG; Constellation Energy Nuclear Group, LLC; and Entergy Nuclear Operations, Inc.: Hurricane Sandy Causes Oyster Creek Alert and Shutdowns of Reactors at Nine Mile Point Unit 1, Indian Point Unit 3, and Salem Unit 1 – (Update)
PNO-lll-12-016 11/13/2012 Detroit Edison Company, Fermi Nuclear Power Plant, Unit 2: Unplanned Shutdown Greater than 72 Hours Due to Hydrogen In-Leakage to the Stator Water Cooling System
PNO-I-12-008 11/13/2012 Entergy Nuclear Operations, Inc.: James A. Fitzpatrick Nuclear Power Plant Notification of Unusual Event Due to Fire in Main Transformer and Bus Ducting
PNO-III-12-015A 11/09/2012 Entergy Nuclear Operations, Inc.: Palisades Shutdown Due to Leakage from the Main Steam System – (Update)
PNO-III-12-015 11/05/2012 Entergy Nuclear Operations, Inc.: Palisades Shutdown Due to Leakage from the Main Steam System
PNO-III-12-014 11/01/2012 Northern States Power Company: Notification of Unusual Event at Prairie Island

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October
PNO-I-12-007 10/31/2012 Exelon Generating Company, LLC, PSEG, Constellation Energy Nuclear Group, LLC and Entergy Nuclear Operations, Inc.: Hurricane Sandy Causes Oyster Creek Alert and Shutdowns of Reactors at Nine Mile Point Unit 1, Indian Point Unit 3, and Salem Unit 1
PNO-III-12-013 10/23/2012 Dominion Energy Kewaunee, Inc./Kewaunee Power Station: Planned Shutdown and Decommissioning of Kewaunee Power Station
PNO-II-12-004A 10/22/2012 Virginia Electric Power Company (VEPCO): Shutdown Greater Than 72 Hours Due to Decreased Unit 2 "A" Reactor Coolant Pump (RCP) #1 Seal Leakoff Flow – (Update)
PNO-II-12-004 10/09/2012 Virginia Electric Power Company (VEPCO): Shutdown Greater Than 72 Hours Due to Decreased Unit 2 "A" Reactor Coolant Pump (RCP) #1 Seal Leakoff Flow
PNO-IV-12-007 10/01/2012 Entergy Operations, Inc.: Grand Gulf Nuclear Station Security Officer Lockout

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September
PNO-II-12-003A 09/27/2012 Duke Energy/Brunswick Steam Electric Plant, Unit 1: Unplanned Shutdown Greater Than 72 Hours Due to Potential 1B Recirculation Pump Seal Failure – (Update)
PNO-III-12-012 09/25/2012 Entergy Nuclear Operations, Inc.: Palisades Leakage from the Service Water System
PNO-III-12-011A 09/20/2012 Detroit Edison Company/Fermi Power Plant, Unit 2: Unplanned Shutdown Greater Than 72 Hours Due To Loss Of The 120 Kilovolt Switchyard – (Update)
PNO-III-12-011 09/18/2012 Detroit Edison Company/Fermi Power Plant, Unit 2: Unplanned Shutdown Greater Than 72 Hours Due To Loss Of The 120 Kilovolt Switchyard
PNO-II-12-003 09/18/2012 Duke Energy/Brunswick Steam Electric Plant, Unit 1: Unplanned Shutdown Greater Than 72 Hours Due to Potential 1B Recirculation Pump Seal Failure
PNO-III-12-010A 09/07/2012 Exelon Generating Company, LLC / Dresden, Unit 2: Unplanned Shutdown Greater Than 72 Hours on August 30, 2012, Due to Circulating Water System Vacuum Vent Line Failure – (Update)
PNO-I-12-006A 09/05/2012 Exelon Generation Company, LLC/Three Mile Island Unit 1: Shutdown due to Reactor Coolant System Leak – (Update)
PNO-IV-2012-006B 09/05/2012 Waterford 3, River Bend Station and Grand Gulf: Region IV Response to Hurricane/Severe Weather on Gulf Coast – (Update)
PNO-III-12-010 09/04/2012 Exelon Generating Company, LLC / Dresden, Unit 2: Unplanned Shutdown Greater Than 72 Hours on August 30, 2012, Due to Circulating Water System Vacuum Vent Line Failure

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August
PNO-III-12-007A 08/30/2012 Entergy Nuclear Operations, Inc./Palisades Nuclear Plant: Shutdown Due to Increase in Unidentified Reactor Coolant System Leakage - (Update)
PNO-IV-12-006A 08/30/2012 Waterford 3, River Bend Station and Grand Gulf: Region IV Response to Hurricane/Severe Weather on Gulf Coast - (Update)
PNO-IV-12-006 08/29/2012 Waterford 3, River Bend Station and Grand Gulf: Region IV Response to Hurricane/Severe Weather on Gulf Coast
PNO-I-12-006 08/23/2012 Exelon Generation Company, LLC/Three Mile Island: Shutdown due to Reactor Coolant System Leak
PNO-III-12-009A 08/20/2012 Northern States Power Co./ Monticello: Shutdown Due to Drywell Unidentified Leakage Above Technical Specification Limits - (Update)
PNO-III-12-009 08/16/2012 Northern States Power Co./ Monticello: Shutdown Due to Drywell Unidentified Leakage Above Technical Specification Limits
PNO-III-12-008 08/16/2012 Northern States Power Company, Minnesota/Prairie Island Unit 1: Unplanned Shutdown Due to Both Emergency Diesel Generators Being Declared Inoperable
PNO-III-12-007 08/14/2012 Entergy Nuclear Operations, Inc./Palisades Nuclear Plant: Shutdown Due to Increase in Unidentified Reactor Coolant System Leakage

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July
PNO-I-12-005 07/31/2012 Exelon Generating Company, LLC/Oyster Creek: Reactor Shutdown and Unusual Event Due to a Loss of Offsite Power and Shutdown Greater Than 72 Hours
PNO-III-12-006A 07/30/2012 Detroit Edison Company/Fermi Power Plant, Unit 2: Unplanned Scram on June 25, 2012, Due To Loss of Reactor Feed Pump - (Update)
PNO-I-12-004A 07/26/2012 Exelon Generating Company, LLC/Limerick Unit 1: Notification of Unusual Event Declared Due to an Electrical Fault in a Non-Safety Related Transformer; Item of Potential Media Interest - (Update)
PNO-I-12-004 07/19/2012 Exelon Generating Company, LLC/Limerick Unit 1: Notification of Unusual Event Declared Due to an Electrical Fault in a Non-Safety Related Transformer
PNO-III-12-004A 07/11/2012 Entergy Nuclear Operations, Inc./Palisades Nuclear Plant: Shutdown Due to Safety Injection Refueling Water Storage Tank Leakage - (Update)
PNO-I-12-002G 07/09/2012 Entergy Nuclear Operations, Inc./Pilgrim Nuclear Power Station: Current NRC Actions and Status of Union Contract Negotiations - (Update)
PNO-IV-12-005 07/05/2012 Uranium One USA, Inc.: Uranium Concentrate (Yellowcake) Released Upon Handling of Product Drum Shipped by Uranium One USA to a Fuel Services Refinery in Ontario, Canada, Resulting in Exposure to Workers
PNO-I-12-003A 07/05/2012 PPL Susquehanna, LLC/Susquehanna Unit 1: Shutdown Expected to be Greater Than 72 hrs to Repair Leak from Chemical Decontamination Pipe on '1A' Reactor Recirculation Loop - (Update)
PNO-I-12-002F 07/03/2012 Entergy Nuclear Operations, Inc./Pilgrim Nuclear Power Station: Current NRC Actions and Status of Union Contract Negotiations – (Update)
PNO-III-12-007 07/02/2012 NextEra Energy Point Beach/Point Beach, Unit 2: Manual Reactor Trip and Unplanned Shutdown Greater Than 72 Hours

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June
PNO-III-12-006 06/28/2012 Detroit Edison Company/Fermi Power Plant, Unit 2: Unplanned Scram on June 25, 2012, Due To Loss of Reactor Feed Pump
PNO-I-12-003 06/21/2012 PPL Susquehanna, LLC/Susquehanna Unit 1: Shutdown Expected to be Greater Than 72 hrs to Repair Leak from Chemical Decontamination Pipe on '1A' Reactor Recirculation Loop
PNO-I-12-002E 06/21/2012 Entergy Nuclear Operations, Inc./Pilgrim Nuclear Power Station: Status of Union Lockout at Pilgrim Nuclear Power Station – (Update)
PNO-III-12-005 06/19/2012 FirstEnergy Nuclear Operating Company/Perry Nuclear Power Plant: Unplanned Shutdown Greater than 72 Hours
PNO-III-12-004 06/14/2012 Entergy Nuclear Operations, Inc./Palisades Nuclear Plant: Shutdown Due to Safety Injection Refueling Water Storage Tank Leakage
PNO-IV-12-004B 06/13/2012 River Bend Station: Augmented Inspection Team onsite at River Bend Station (Update)
PNO-I-12-002D 06/06/2012 Entergy Nuclear Operations, Inc./Pilgrim Nuclear Power Station: Current NRC Actions During Pilgrim Nuclear Power Station Union Contract Negotiations – (Update)
PNO-IV-12-004A 06/05/2012 River Bend Station: Augmented Inspection Team onsite at River Bend Station (Update)

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May
PNO-I-12-002C 05/29/2012 Entergy Nuclear Operations, Inc./Pilgrim Nuclear Power Station: Current NRC Actions During Pilgrim Nuclear Power Station Union Contract Negotiations – (Update)
PNO-IV-12-004 05/29/2012 River Bend Station: Augmented Inspection Team onsite at River Bend Station
PNO-I-12-002B 05/25/2012 Entergy Nuclear Operations, Inc./Pilgrim Nuclear Power Station: Current NRC Actions During Pilgrim Nuclear Power Station Union Contract Negotiations – (Update)
PNO-I-12-002A 05/17/2012 Entergy Nuclear Operations, Inc./Pilgrim Nuclear Power Station: Current NRC Actions and Status of Pilgrim Nuclear Power Station Union Contract Negotiations – (Update)
PNO-I-12-002 05/16/2012 Entergy Nuclear Operations, Inc./Pilgrim Nuclear Power Station: Current NRC Actions During Pilgrim Nuclear Power Station Union Contract Negotiations
PNO-I-12-001A 05/09/2012 PSEG/Salem Generating Station: Salem Generating Station Unit 1 Inadvertent Safety Injection and Notification of Unusual Event due to Fire Alarm in Containment (Update)
PNO-I-12-001 05/03/2012 PSEG/Salem Generating Station: Salem Generating Station Unit 1 Inadvertent Safety Injection and Notification of Unusual Event due to Fire Alarm in Containment

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April
PNO-IV-11-009B 04/24/2012 South Texas Project Nuclear Operating Company/South Texas Project Unit 2: Reactor Trip and Extended Outage - (Update)
PNO-II-12-001 04/05/2012 Catawba Nuclear Station Units 1 and 2: Notification of Unusual Event due to Loss of Offsite Power

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March
PNO-IV-12-002B 03/27/2012 Wolf Creek Nuclear Operating Corp./Wolf Creek Generating Station: Plant Startup Following Reactor Trip and Loss of Offsite Power at Wolf Creek Generating Station - (Update)
PNO-IV-12-003A 03/16/2012 Southern California Edison Company/San Onofre Nuclear Generating Station: Augmented Inspection Team Onsite at San Onofre Unit 3 - (Update)
PNO-III-12-003 03/14/2012 Exelon Generation Company, LLC/Byron Unit 1: Unplanned Shutdown for Greater Than 72 Hours
PNO-III-12-002A 03/02/2012 Exelon Generation Company, LLC/Byron Unit 1: Loss of Offsite Power and Declaration of a Notice of Unusual Event - (Update)

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February
PNO-III-12-002 02/29/2012 Exelon Generation Company, LLC/Byron Unit 1: Loss of Offsite Power and Declaration of a Notice of Unusual Event
PNO-III-12-001 02/07/2012 Exelon Generation Company, LLC/Byron Unit 2: Restarts After a Loss of Offsite Power and Declaring a Notice of Unusual Event
PNO-IV-12-003 02/01/2012 Southern California Edison Company/San Onofre Unit 3: Steam Generator Tube Leak and Rapid Shutdown

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January
PNO-IV-12-002A 01/30/2012 Wolf Creek Nuclear Operating Corp./Wolf Creek Generating Station: Augmented Inspection Team Onsite - (Update)
PNO-IV-12-002 01/18/2012 Wolf Creek Nuclear Operating Corp./Wolf Creek Generating Station: Notification of Unusual Event
PNO-IV-11-009A 01/12/2012 South Texas Project Nuclear Operating Company/South Texas Project Unit 2: Reactor Trip - (Update)

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Page Last Reviewed/Updated Tuesday, March 9, 2021