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Preliminary Notification (PN) Reports for 2014

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

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December
PNO-III-14-012A 12/29/2014 Northern States Power Co.: Shutdown of Prairie Island Unit 1 due to Increasing Trend In Reactor Coolant System Leakage – (Update)
PNO-III-14-012 12/12/2014 Northern States Power Co.: Shutdown of Prairie Island Unit 1 due to Increasing Trend In Reactor Coolant System Leakage

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November
PNO-II-14-008C 11/13/2014 Honeywell Specialty Chemicals/Honeywell International, Inc.: Honeywell Metropolis Works Shut Down Due to UF6 Leak - (Update)
PNO-III-14-010A 11/12/2014 Indiana Michigan Power Company: D.C. Cook Dual Unit Manual Trip resulting in a Shutdown for greater than 72 Hours on Unit 2 - (Update)
PNO-III-14-010 11/04/2014 Indiana Michigan Power Company: D.C. Cook Dual Unit Manual Trip resulting in a Shutdown for greater than 72 Hours on Unit 2

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October
PNO-II-14-008A 10/31/2014 Honeywell Specialty Chemicals/Honeywell International, Inc.: Honeywell Metropolis Works Shut Down Due to UF6 Leak - (Update)
PNO-III-14-009A 10/27/2014 FirstEnergy Nuclear Operating Company (Perry Nuclear Power Plant): Unplanned Shutdown Greater Than 72 Hours due to a Loss of Feedwater – (Update)
PNO-II-14-008 10/27/2014 Honeywell Specialty Chemicals/Honeywell International, Inc.: Honeywell Metropolis Works Shut Down Due to UF6 Leak
PNO-III-14-009 10/24/2014 FirstEnergy Nuclear Operating Company (Perry Nuclear Power Plant): Unplanned Shutdown Greater Than 72 Hours due to a Loss of Feedwater

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August
PNO-III-14-008A 08/19/2014 Exelon Generation Company/LaSalle County Station, Unit 2: Shutdown Greater than 72 Hours Following a Reactor Scram – (Update)
PNO-III-14-008 08/07/2014 Exelon Generation Company/LaSalle County Station, Unit 2: Shutdown Greater than 72 Hours Following a Reactor Scram
PNO-II-14-006A 08/06/2014 Tennessee Valley Authority (TVA)/Browns Ferry Unit 2: Shutdown Greater than 72 Hours due to Increased Primary Coolant Leakage – (Update)
PNO-II-14-006 08/05/2014 Tennessee Valley Authority (TVA)/Browns Ferry Unit 2: Shutdown Greater than 72 Hours due to Increased Primary Coolant Leakage
PNO-II-14-007 08/04/2014 Honeywell Specialty Chemicals/Honeywell International, Inc.: Bargaining Unit Lockout at Honeywell - Metropolis Works

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July
PNO-I-14-003 07/29/2014 Dominion Nuclear Connecticut, Inc./Millstone Power Station Units 2: Shutdown Greater than 72 Hours due to a Technical Specification Required Shutdown for the Turbine Driven Auxiliary Feedwater Pump
PNO-II-14-005A 07/24/2014 South Carolina Electric & Gas/V.C. Summer, Unit 1: Shutdown Greater Than 72 Hours Due to Leaking Pressurizer Safety Valve – (Update)
PNO-II-14-005 07/14/2014 South Carolina Electric & Gas/V.C. Summer, Unit 1: Shutdown Greater Than 72 Hours Due to Leaking Pressurizer Safety Valve
PNO-III-14-007 07/09/2014 FirstEnergy Nuclear Operating Company/Davis-Besse Nuclear Power Station: Unusual Event Due To Smoke Detector Alarm In Containment Building

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June
PNO-III-14-006 06/11/2014 Execon Generation Co./Dresden, Unit 2 and Unit 3: Report of Tritium at Dresden Sewage Treatment Plant
PNO-I-14-002A 06/02/2014 Dominion Nuclear Connecticut, Inc./Millstone Power Station Units 2 & 3: Unusual Event Declared Due to Loss of Offsite Power and Dual Reactor Trips – (Update)
May
PNO-I-14-002 05/28/2014 Dominion Nuclear Connecticut, Inc./Millstone Power Station Units 2 & 3: Unusual Event Declared Due to Loss of Offsite Power and Dual Reactor Trips

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April
PNO-III-14-005A 04/29/2014 Exelon Generation Co./Dresden Unit 2: Shutdown due to Main Transformer Damage – (Update)
PNO-III-14-003A 04/28/2014 FirstEnergy Nuclear Operating Company/Davis-Besse: Shield Building Restoration – (Update)
PNO-III-14-005 04/15/2014 Exelon Generation Co./Dresden Unit 2: Shutdown due to Main Transformer Damage
PNO-II-14-004 04/07/2014 Carolina Power & Light Co./Robinson Unit 2: Shutdown Due to Steam Generator Tube Leak – (Update)
PNO-III-14-004 04/03/2014 FirstEnergy Nuclear Operating Company/Perry Nuclear Power Plant: Notification of Unusual Event Due to Toxic Chemical Leak

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March
PNO-II-14-002A 03/14/2014 Entergy Nuclear Operations, Inc./Palisades: Control Rod Drive Mechanism Housing Flaws
PNO-II-14-004 03/10/2014 Carolina Power & Light Co./Robinson Unit 2: Shutdown Due to Steam Generator Tube Leak
February
PNO-III-14-003 02/19/2014 FirstEnergy Nuclear Operating Company/Davis-Besse: Shield Building Voids

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January
PNO-III-14-001A 02/07/2014 Northern States Power Co./Monticello: Shutdown Due To Reactor Coolant System (RCS) Pressure Boundary Leakage In Excess Of Technical Specification Limits – (Update)
PNO-III-14-002 01/30/2014 Entergy Nuclear Operations, Inc.: Palisades Control Rod Drive Mechanism Housing Flaws
PNO-I-14-001 01/27/2014 Constellation Energy Nuclear Group, LLC/Calvert Cliffs Nuclear Power Plant: Dual Unit Trip Following the Loss of the '21' 13 kV Bus
PNO-II-14-001 01/21/2014 Progress Energy Carolinas, Inc. (PEC)/Harris Unit 1: Shutdown and Alert Declared due to Fire
PNO-III-14-001 01/21/2014 Northern States Power Co./Monticello: Shutdown Due To RCS Pressure Boundary Leakage In Excess Of Technical Specification Limits

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Page Last Reviewed/Updated Tuesday, March 9, 2021