Preliminary Notification (PN) Reports for 2013

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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)
November
PNO-II-13-008	11/12/2013	Duke Power Co.: Oconee Unit 1 Shutdown due to Reactor Coolant System (RCS) Pressure Boundary Leakage
September
PNO-III-13-007	09/20/2013	FirstEnergy Nuclear Operating Company: Davis-Besse Nuclear Power Station: Davis-Besse Shield Building Laminar Cracks
August
PNO-IV-13-002C	08/08/2013	Entergy: Arkansas Nuclear One, Unit 1, Return to Power Operation - (Update)
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
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
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
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)
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)
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
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)