United States Nuclear Regulatory Commission - Protecting People and the Environment

Preliminary Notification (PN) Reports for 2013

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

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December
PNO-III-13-008 12/13/2013 Exelon Generation Co., LLC: Clinton Manual Scram Following Transformer Failure
PNO-IV-13-004A 12/10/2013 Entergy: Arkansas Nuclear One, Unit 2, Fire in Auxilary Transformer
PNO-IV-13-004 12/09/2013 Entergy: Arkansas Nuclear One, Unit 2, Notification of Unusual Event
PNO-II-13-008A 12/02/2013 Duke Power Co.: Oconee Unit 1 Shutdown due to Reactor Coolant System (RCS) Pressure Boundary Leakage – (Update)

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November
PNO-II-13-008 11/12/2013 Duke Power Co.: Oconee Unit 1 Shutdown due to Reactor Coolant System (RCS) Pressure Boundary Leakage

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September
PNO-III-13-007 09/20/2013 FirstEnergy Nuclear Operating Company: Davis-Besse Nuclear Power Station: Davis-Besse Shield Building Laminar Cracks

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August
PNO-IV-13-002C 08/08/2013 Entergy: Arkansas Nuclear One, Unit 1, Return to Power Operation - (Update)

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July
PNO-III-13-006A 07/15/2013 FirstEnergy Nuclear Operating Company: Davis-Besse Nuclear Power Station: Davis-Besse Unplanned Shutdown Greater Than 72 Hours on June 29, 2013, Due to Trip of Reactor Coolant Pump and Subsequent Discovery of Reactor Pressure Boundary Leakage - (Update)
PNO-III-13-006 07/02/2013 FirstEnergy Nuclear Operating Company: Davis-Besse Nuclear Power Station: Davis-Besse Unplanned Shutdown Greater Than 72 Hours on June 29, 2013, Due to Trip of Reactor Coolant Pump and Subsequent Discovery of Reactor Pressure Boundary Leakage

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June
PNO-III-13-005 06/18/2013 FirstEnergy Nuclear Operating Company: Perry Nuclear Power Plant: Unplanned Shutdown Greater than 72 Hours Due to a Pressure Boundary Leak
PNO-III-13-004B 06/17/2013 Entergy Nuclear Operations, Inc.: Palisades Shutdown Due to Safety Injection Refueling Water Tank (SIRWT) Leakage - (Update)
PNO-IV-13-003 06/07/2013 Southern California Edison Company: San Onofre Units 2 and 3: Licensee Announcement of Permanent Shutdown of San Onofre Nuclear Generating Station (Songs) Units 2 and 3

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May
PNO-III-13-004A 05/06/2013 Entergy Nuclear Operations, Inc.: Palisades Shutdown Due to Safety Injection Refueling Water Storage Tank (SIRWT) Leakage - (Update)
PNO-III-13-004 05/06/2013 Entergy Nuclear Operations, Inc.: Palisades Shutdown Due to Safety Injection Refueling Water Storage Tank Leakage

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April
PNO-IV-13-002B 04/30/2013 Entergy: Arkansas Nuclear One Unit 2 Reactor Trip and Notification of Unusual Event - (Update)
PNO-IV-13-001A 04/23/2013 South Texas Project Nuclear Operating Company: South Texas Project Unit 2 Reactor Trip - (Update)
PNO-II-13-005A 04/23/2013 Tennessee Valley Authority: Notification of Unusual Event Due to Security Incident - (Update)
PNO-II-13-005 04/21/2013 Tennessee Valley Authority: Notification of Unusual Event Due to Security Incident
PNO-III-13-003 04/18/2013 Exelon Generation: LaSalle County Station Loss of Off-Site Power and Dual Unit Reactor Scram
PNO-IV-13-002A 04/09/2013 Entergy: Augmented Inspection Team Onsite at Arkansas Nuclear One - Update - (Update)
PNO-IV-13-002 04/02/2013 Entergy: Arkansas Nuclear One, Units 2, Notification Of Unusual Event
PNO-II-13-003A 04/01/2013 Florida Power and Light Co.: Unplanned Shutdown Greater Than 72 Hours Due to Closure Of B Train Steam Generator Main Steam Isolation Valve - (Update)

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March
PNO-II-13-004A 03/27/2013 Tennessee Valley Authority (TVA): Unplanned Shutdown Greater Than 72 Hours Due to Reactor Feedwater Heater Level Control Line Leak - (Update)
PNO-II-13-004 03/21/2013 Tennessee Valley Authority (TVA): Unplanned Shutdown Greater Than 72 Hours Due to Reactor Feedwater Heater Level Control Line Leak
PNO-II-13-003 03/14/2013 Florida Power and Light Co.: Unplanned Shutdown Greater Than 72 Hours Due to Closure of B Train Steam Generator Main Steam Isolation Valve
PNO-II-13-001A 03/11/2013 Florida Power and Light Co.: Unit Startup Following Unplanned Shutdown Greater Than 72 Hours Due To High Reactor Coolant Pump Seal Leak Off Rate - (Update)

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February
PNO-III-13-002A 02/22/2013 Entergy Nuclear Operations, Inc.: Palisades Shutdown Due to Leakage from the Component Cooling Water (CCW) System - (Update)
PNO-II-13-001 02/19/2013 Florida Power and Light Co.: Unplanned Shutdown Greater than 72 Hours Due to High Reactor Coolant Pump Seal Leak Off Rate
PNO-I-13-001D 02/19/2013 Entergy Nuclear Operations, Inc./ Pilgrim Station: Unusual Event Declared Due to Loss of Offsite Power During Winter Storm Nemo - (Update)
PNO-III-13-002 02/15/2013 Entergy Nuclear Operations, Inc.: Palisades Shutdown Due to Leakage from the Component Cooling Water (CCW) System
PNO-I-13-001C 02/11/2013 Entergy Nuclear Operations, Inc./ Pilgrim Station: Unusual Event Declared Due to Loss of Offsite Power During Winter Storm Nemo - (Update)
PNO-I-13-001B 02/10/2013 Entergy Nuclear Operations, Inc./ Pilgrim Station: Unusual Event Declared Due to Loss of Offsite Power During Winter Storm Nemo - (Update)
PNO-I-13-001A 02/09/2013 Entergy Nuclear Operations, Inc./ Pilgrim Station: Unusual Event Declared Due to Loss of Offsite Power During Winter Storm Nemo - (Update)
PNO-I-13-001 02/09/2013 Entergy Nuclear Operations, Inc./ Pilgrim Station: Unusual Event Declared Due to Loss of Offsite Power During Winter Storm Nemo

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January
PNO-III-13-001 01/29/2013 FirstEnergy Nuclear Operating Company/Perry Nuclear Power Plant: Unplanned Shutdown Greater than 72 Hours Due to an Automatic Reactor Protection System Actuation
PNO-IV-13-001 01/09/2013 South Texas Project Nuclear Operating Company: South Texas Project Unit 2 Reactor Trip
PNO-lll-12-016A 01/04/2013 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 – (Update)

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Page Last Reviewed/Updated Thursday, April 07, 2016