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Due to a lapse in appropriations, the NRC has ceased normal operations. However, excepted and exempted activities necessary to maintain critical health and safety functions—as well as essential progress on designated critical activities, including those specified in Executive Order 14300—will continue, consistent with the OMB-Approved NRC Lapse Plan.

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Preliminary Notification (PN) Reports for 2012

| January | February | March | Apil | May | June | July | August | September | October | November | December |

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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 09, 2021

Page Last Reviewed/Updated Tuesday, March 09, 2021