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Preliminary Notification (PN) Reports for 2009

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December
PNO-III-09-015 12/23/2009 Indiana Michigan Power Company: D.C. Cook Unit 1 - 100 Percent Power
PNO-I-09-007 12/21/2009 Dominion Nuclear Connecticut: Millstone Unit 3 Reactor Trip and Shutdown Greater Than 72 Hours
PNO-III-09-014 12/18/2009 Indiana Michigan Power Company: D.C. Cook Unit 1 Restart

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November
PNO-I-09-006 11/24/2009 Exelon Generation Company, LLC: Three Mile Island Unit 1 - Contamination Event (Update)
PNO-II-09-006 11/24/2009 South Carolina Electric & Gas Company: Fire Within the Protected Area of V. C. Summer Nuclear Station
PNO-III-09-013 11/23/2009 Donald C. Cook Nuclear Plant: D. C. Cook Unit 1 Mode Change Following 14 Months Forced Outage
PNO-III-09-009A 11/12/2009 Detroit Edison Company: Fermi 2 Unplanned Shutdown for Greater Than 72 Hours to Repair Hydrogen In-Leakage - Update
PNO-III-09-012A 11/03/2009 FirstEnergy Nuclear Operating Co.: Manual Reactor Scram During Planned Shutdown (Update)

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October
PNO-III-09-011A 10/26/2009 Exelon Generation Company: Clinton Power Station Unplanned Shutdown Greater than 72 Hours - Update
PNO-III-09-012 10/19/2009 FirstEnergy Nuclear Operating Co.: Manual Reactor Scram During Planned Shutdown
PNO-III-09-011 10/16/2009 Exelon Generation Company: Clinton Power Station Unplanned Shutdown Greater Than 72 Hours
PNO-IV-09-005 10/14/2009 Basin Electric Power Cooperative: Potential Overexposures to Members of the Public
PNO-III-09-010 10/15/2009 Exelon Generation Co.: Lasalle Unit 2 Unplanned Shutdown Greater than 72 hours
PNO-III-09-009 10/01/2009 Detroit Edison Company: Fermi 2 Unplanned Shutdown for Greater Than 72 Hours to Repair Hydrogen In-Leakage

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September
There were no Preliminary Notifications Reports for September in 2009.

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August
PNO-IV-09-004A 08/31/2009 Energy Northwest: Columbia Generating Station Startup Following an Automatic Reactor Scram Due to a Turbine Trip and Declaration of an Unusual Event Due to Possible Toxic Gas (Update)
PNO-III-09-008A 08/20/2009 Exelon Generation Co.: Lasalle Unit 2 Unplanned Shutdown Greater than 72 hours (Update)
PNO-III-09-008 08/18/2009 Exelon Generation Co.: Lasalle Unit 2 Unplanned Shutdown Greater than 72 hours
PNO-III-09-006A 08/10/2009 Donald C. Cook Nuclear Plant: D.C. Cook Unit 2 Forced Shutdown for Greater than 72 hours to Repair Reactor Coolant Pump Seal (Update)
PNO-IV-09-004 08/05/2009 Energy Northwest: Columbia Generating Station Unusual Event and Automatic Reactor Scram Due to Fire Resulting in Possible Toxic Gas
PNO-III-09-007A 08/05/2009 Braidwood Nuclear Station: Unusual Event at Braidwood Unit 2 Due to Loss of Offsite Power; Unit will Remain Shut Down for More Than 72 Hours (Update)
PNO-II-09-004 08/03/2009 Honeywell International, Inc.: Vehicle Accident Involving Uranium Hexafluoride Shipment

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July
PNO-III-09-007 07/31/2009 Braidwood Nuclear Station: Unusual Event at Braidwood Unit 2 Due to Loss of Offsite Power; Unit will Remain Shut Down for More Than 72 Hours
PNO-III-09-006 07/28/2009 Donald C. Cook Nuclear Plant: D.C. Cook Unit 2 Forced Shutdown for Greater Than 72 Hours to Repair Reactor Coolant Pump Seal
PNO-I-09-004A 07/27/2009 Dominion Nuclear Connecticut: Updated - Millstone Unit 2 Reactor Trip and Shutdown Greater Than 72 Hours
PNO-I-09-005A 07/17/2009 Exelon Generation Company, LLC: Updated - Oyster Creek Reactor Trip and Unusual Event Due to a Loss of Offsite Power and Shutdown Greater than 72 Hours
PNO-II-09-003 07/17/2009 USEC - Portsmouth Gaseous Diffusion Plant: Alert Declared Based on Fire Lasting Longer than 15 Minutes
PNO-II-09-002 07/16/2009 B&W Nuclear Operations Group: Alert Declared Based on Loss of Controlled Parameters for Criticality Safety
PNO-I-09-005 07/15/2009 Exelon Generation Company, LLC: Oyster Creek Reactor Trip and Unusual Event Due to a Loss of Offsite Power and Shutdown Greater than 72 Hours
PNO-I-09-004 07/03/2009 Dominion Nuclear Connecticut: Millstone Unit 2 Reactor Trip and Shutdown Greater Than 72 Hours

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June
PNO-III-09-005A 06/29/2009 FirstEnergy Nuclear Operating Company, Davis-Besse: Transitory Alert Due to Electric Device Failure (Update)
PNO-III-09-005 06/26/2009 FirstEnergy Nuclear Operating Company, Davis-Besse: Transitory Alert Due to Electric Device Failure
PNO-III-09-004 06/10/2009 Exelon Generation Company, Dresden 2 and 3: Tritium Leak
PNO-I-09-003A 06/08/2009 Entergy Nuclear Operations, Inc.: Indian Point Unit 3 Shutdown Due to Feedpump Issues (Update)
PNO-I-09-003 06/01/2009 Entergy Nuclear Operations, Inc.: Indian Point Unit 3 Shutdown Due to Feedpump Issues

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May
PNO-III-09-003A 05/22/2009 Prairie Island Unit 1: Unplanned Unit 1 Shutdown (Update)
PNO-III-09-003 05/20/2009 Prairie Island Unit 1: Prairie Island Unplanned Unit 1 Shutdown
PNO-I-09-002A 05/04/2009 Exelon Generating Company, LLC, Oyster Creek Nuclear Generating Station: Shutdown Greater Than 72 Hours:  Manual Reactor Scram Following Loss of Cooling Tower to Main Transformer - Update

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April
PNO-I-09-002 04/27/2009 Exelon Generating Company, LLC, Oyster Creek Nuclear Generating Station: Shutdown Greater than 72 Hours: Manual Reactor Scram Following Loss of Cooling to Main Transformer
PNO-III-09-002 04/20/2009 Kewaunee Power Station, Dominion Energy Kewaunee, Inc.: Unplanned Shutdown Due to Main Steam Pressure Instruments Not Calibrated as Required

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March
PNO-IV-09-003 03/12/2009 Southern California Edison Company, San Onfore Nuclear Generating Station: Contract Fire Watch Employee Terminated for use of a Prohibited Substance in the Site Protected Area
PNO-IV-09-002A 03/02/2009 AmerenUE, Inc., Callaway Plant: Plant Shutdown and Subsequent Declaration of Unusual Event Associated with Main Generator Hydrogen Leakage (Update)

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February
PNO-III-09-001A 02/23/2009 Palisades Nuclear Plant, Entergy Nuclear Operations, Inc.: Palisades Forced Shutdown for Greater than 72 Hours to Replace Leaking Control Rod Drive Seals (Update)
PNO-IV-09-002 02/19/2009 AmerenUE, Inc., Callaway Plant: Plant Shutdown and Subsequent Declaration of Unusual Event Associated with Main Generator Hydrogen Leakage
PNO-III-09-001 02/18/2009 Palisades Nuclear Plant, Entergy Nuclear Operations, Inc.: Palisades Forced Shutdown for Greater than 72 Hours to Replace Leaking Control Rod Drive Seals
PNO-IV-09-001A 02/10/2009 Entergy Operating, Inc., Arkansas Nuclear One - Unit 1: Unit 1 trip and Fire Associated With Main Generator (Update)
PNO-IV-09-001 02/09/2009 Entergy Operating, Inc., Arkansas Nuclear One - Unit 1: Unit 1 trip and Fire Associated With Main Generator
PNO-I-09-001A 02/05/2009 Unusual Event and Automatic Reactor Scram due to a Fire in the M1A Main Transformer (Update)
PNO-I-09-001 02/01/2009 Unusual Event and Automatic Reactor Scram due to a Fire in the M1A Main Transformer

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January
There were no Preliminary Notifications Reports for January in 2009.

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Page Last Reviewed/Updated Wednesday, March 10, 2021