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Preliminary Notification (PN) Reports for 2007

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December
PNO-III-07-016 12/26/2007 Nuclear Management Company: Prairie Island - Unplanned Unit 1 Shutdown Greater Than 72 Hours
PNO-II-07-009C 12/19/2007 Joseph M. Farley, Unit 1: Farley Augmented Inspection Team (AIT) (Update)
PNO-III-07-015A 12/06/2007 FirstEnergy Nuclear Operating Company/Perry Nuclear Power Station: Perry scram and feedwater loss (Update)

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November
PNO-III-07-015 11/28/2007 FirstEnergy Nuclear Operating Company/Perry Nuclear Power Station: Perry scram and feedwater loss
PNO-III-07-014 11/27/2007 Exelon Generation Co., Byron, IL; Byron Unit 1: Nitrogen Leak During Maintenance
PNO-IV-07-011 11/26/2007 Palo Verde Nuclear Generating Station (PVNGS): Unit 1 Technical Specification Required Shutdown
PNO-I-07-010 11/14/2007 Amergen Energy Company, LLC: Notification of Unusual Event Due to Indication of Unexpected Inventory Loss while in a Drain Down Condition
PNO-II-07-012A 11/07/2007 Catawba Nuclear Stations: Onsite Ground Water Tritium Contamination at the Catawba Nuclear Station Site (Update)
PNO-IV-07-010 11/02/2007 Palo Verde Nuclear Generating Station: Palo Verde Nuclear Generating Station (PVNGS) Notification of Unusual Event

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October
PNO-III-07-012A 10/31/2007 Exelon Generation Company, LLC: Both Units at Byron Shut Down Due to Leak in Pipe (Update)
PNO-III-07-013 10/30/2007 Karmanos Cancer Center: Medical Event
PNO-IV-07-008D 10/26/2007 Southern California Edison Company San Onofre Units 2 & 3: Southern California Brush Fires and San Onofre Nuclear Generating Station Status (Update)
PNO-IV-07-008C 10/25/2007 Southern California Edison Company San Onofre Units 2 & 3: Southern California Brush Fires and San Onofre Nuclear Generating Station (SONGS) Status (Update)
PNO-IV-07-008B 10/25/2007 Southern California Edison Company San Onofre Units 2 & 3: Southern California Brush Fires and San Onofre Nuclear Generating Station Status (Update)
PNO-II-07-013 10/24/2007 Browns Ferry 1, 2 and 3: Browns Ferry Refueling Floor Crane Cable Deformation
PNO-IV-07-009 10/24/2007 Entergy Operations, Inc. (Arkansas Nuclear One): Alert at Arkansas Nuclear One Unit 2
PNO-IV-07-008A 10/23/2007 Southern California Edison Company San Onofre Units 2 & 3: Southern California Brush Fires and San Onofre Nuclear Generating Station Status (Update)
PNO-IV-07-008 10/23/2007 Southern California Edison Company San Onofre Units 2 & 3: Southern California Brush Fires and San Onofre Nuclear Generating Station Status
PNO-III-07-012 10/23/2007 Exelon Generation Company, LLC: Both Units at Byron Shut Down Due to Leak in Pipe
PNO-II-07-009B 10/22/2007 Farley Unit 1: Extended Farley Augmented Inspection Team (AIT) (Update)
PNO-IV-07-007 10/22/2007 Arizona Public Service Company: Palo Verde Nuclear Generating Station, Unit 1 Technical Specification Required Reactor Shutdown
PNO-III-08-011 10/16/2007 Exelon Nuclear Generating Company: Tritium Leakage
PNO-III-07-010A 10/15/2007 Fermi: Unusual Event Terminated at Fermi & Special Inspection Team Dispatched (Update)
PNO-III-07-010 10/12/2007 Fermi: Unusual Event Declared at Fermi Due at Unexpected Piping Hole and Indentations
PNO-II-07-012 10/11/2007 Catawba Nuclear Station Units 1 & 2: Onsite Ground Water Tritium Contamination
PNO-II-07-011A 10/01/2007 Browns Ferry Unit 3: Pressure Boundary Leakage Discovered During Drywell Inspection (Update)

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September
PNO-II-07-009A 09/28/2007 Joseph M. Farley Nuclear Plant Unit 1: Component Cooling Water Pump Breaker Failures (Update)
PNO-II-07-011 09/24/2007 Browns Ferry Unit 3: Pressure Boundary Leakage Discovered During Drywell Inspection
PNO-I-07-009 09/20/2007 Nine Mile Point Unit 2: Inadvert Discharge of Carbon Dioxide
PNO-I-07-008 09/14/2007 Vermont Yankee: Restoration of West Cooling Towers
PNO-II-07-010 09/10/2007 McGuire Nuclear Station: Special Inspection To Review Charging Pump Oil Coolers
PNO-II-07-009 09/10/2007 Joseph M. Farley Nuclear Plant Unit 1: Component Cooling Water Pump Breaker Failures

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August
PNO-II-07-008A 08/31/2007 St. Lucie Unit 2: Shutdown to Repair Reactor Coolant Pump Seal Injection Line Leak (Update)
PNO-II-07-008 08/20/2007 St. Lucie Unit 2: Shutdown to Repair Reactor Coolant Pump Seal Injection Line Leak
PNO-I-07-007 08/08/2007 Peach Bottom Nuclear Generating Station: Alert Declared due to Carbon Dioxide Leak from a Portable Fire Extinguisher in the Diesel Generator Building
PNO-II-07-007 08/02/2007 Brunswick Steam and Electric Plant (Unit 1): Unit 1, ‘B’ Residual Heat Removal Service Water Motor Operated Supply Valve Failure

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July
PNO-III-07-009A 07/24/2007 First Energy Nuclear Operating Company: Unexpected Reactor Shut Down Exceeding 72 Hours Due to Problem with Reactor Recirculation Pump Motor (Update)
PNO-I-07-006A 07/24/2007 Oyster Creek: Reactor Scram on Low Reactor Vessel Water Level Due to a Trip of the 'C' Reactor Feed Pump (Update)
PNO-I-07-006 07/19/2007 Oyster Creek: Reactor Scram on Low Reactor Vessel Water Level Due to a Trip of the 'C' Reactor Feed Pump
PNO-III-07-009 07/05/2007 First Energy Nuclear Operating Company: Unexpected Reactor Shut Down Exceeding 72 Hours Due to Problem with Reactor Recirculation Pump Motor
PNO-II-07-006 07/02/2007 North Anna Power Station (Unit 2): Unit 2 Spurious Safety Injection Partial Actuation and Reactor Trip

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June
PNO-IV-07-006A 06/27/2007 San Onofre Nuclear Generating Station Unit 2: Unit 2 Reactor Shutdown (Update)
PNO-III-07-008A 06/26/2007 Point Beach Unit 1: Unit 1 Reactor Shutdown (Update)
PNO-IV-07-006 06/22/2007 San Onofre Nuclear Generating Station Unit 2: Unit 2 Reactor Shutdown
PNO-III-07-008 06/18/2007 Point Beach Unit 1: Unit 1 Reactor Shutdown
PNO-II-07-005 06/14/2007 Brunswick Steam Electric Plant: Onsite Surface Water and Ground Water Tritium Contamination
PNO-III-07-007A 06/11/2007 Point Beach Unit 1: Manual Reactor Trip (Update)
PNO-III-07-007 06/08/2007 Point Beach Unit 1: Manual Reactor Trip
PNO-IV-07-005A 06/04/2007 River Bend Station: Reactor Shutdown Due to Unexpected Change in Recircuation Flow (Update)

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May
PNO-IV-07-005 05/23/2007 River Bend Station: Reactor Shutdown Due to Unexpected Change in Recirculation Flow
PNO-III-07-006A 05/14/2007 Entergy Nuclear Operations, Inc.: Palisades Shutdown Due to Low Steam Generator Level (Update)
PNO-III-07-006 05/09/2007 Entergy Nuclear Operations, Inc.: Palisades Shutdown Due to Low Steam Generator Level

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April
PNO-II-07-004 04/25/2007 Vogtle Nuclear Plant Unit 2: Automatic Reactor Trip/ Plant Shutdown Greater Than 72 Hours
PNO-I-07-004A 04/20/2007 Indian Point Unit 3: Unusual Event Declared Due to Explosion in 31 Main Power Transformer at Indian Point Unit 3 (Update)
PNO-I-07-005 04/20/2007 Cardinal Health, Inc.: Stolen Nuclear Medicine Syringes
PNO-IV-07-004A 04/11/2007 Energy Northwest (Columbia Generating Station): Forced Outage Resulting from a Technical Specification Required Plant Shut Down (Update)
PNO-IV-07-004 04/09/2007 Energy Northwest (Columbia Generating Station): Alert Declaration Due to a Transformer Fire and Initiation of a Technical Specification Required Plant Shutdown
PNO-I-07-004 04/06/2007 Indian Point Unit 3.: Notification of Unusual Event (NOUE) Declared Due to Fire in 'B' Phase Main Power Transformer at Indian Point Unit 3
PNO-IV-07-003 04/05/2007 Callaway Nuclear Station: Callaway Alert Declaration Due to a Suspected Transformer Fire
PNO-II-07-003 04/03/2007 Brunswick Unit 1: Plant Shutdown Required by Technical Specifications

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March
PNO-I-07-003A 03/26/2007 Underwood Engineering Testing Co., Inc.: Found Troxler Moisture/Density Portable Gauge (Update)
PNO-I-07-003 03/23/2007 Underwood Engineering Testing Co., Inc.: Found Troxler Moisture/Density Portable Gauge
PNO-III-07-005 03/20/2007 Nuclear Management Co./Prairie Island: Prairie Island Non-Credible Bomb Threat
PNO-III-07-004A 03/12/2007 Kewaunee: Reactor Shutdown (Update)
PNO-II-07-002 03/09/2007 Vogtle: Vogtle Unit 2 Notification of Unusual event (Noue) Due to Reactor Coolant System (RCS) Leakage in Excess of 10 Gallons Per Minute (GPM)
PNO-IV-07-001A 03/07/2007 IPS: Update: Radiation Dose in Excess of Regulatory Limits
PNO-III-07-003A 03/05/2007 Palisades Nuclear Plant: Palisades Shutdown To Replace Heat-Damaged Cables (Update)
PNO-III-07-004 03/01/2007 Kewaunee: Reactor Shutdown

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February
PNO-IV-07-002 02/27/2007 Southwest Research Institute: Report of Leaking Source
PNO-IV-07-001 02/27/2007 IPS: Radiation Does in Excess of Regulatory Limits
PNO-III-07-003 02/27/2007 Palisades Nuclear Plant: Palisades Shutdown To Replace Heat-Damaged Cables
PNO-I-07-002 02/27/2007 Peach Bottom Unit 3: Notification of Unusual Event Declared
PNO-I-06-013A 02/01/2007 Princeton University: Leaking Strontium-90 Plated Source Identified at University (Update)

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January
PNO-III-07-002 01/26/2007 Potential Overexposure of a Radiographer
PNO-III-07-001A 01/22/2007 Nuclear Management Co./Monticello: Monticello Reactor Shutdown Due to Turbine Control Valve Failure (Update)
PNO-II-06-004B 01/22/2007 AREVA NP, Inc.: Workers Exposed To Hydrogen Fluoride (HF) Release (Update)
PNO-III-07-001 01/12/2007 Nuclear Management Company/Monticello: Monticello Reactor Shutdown Due to Turbine Control Valve Failure (Event Notification EN 43088)
PNO-II-07-001 01/04/2007 Paducah Gaseous Diffusion Plant: Press Interest in Transportation Accident
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Page Last Reviewed/Updated Tuesday, March 9, 2021