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{
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	Issue date	Title	Topic
05000259/LER-2016-001	21 June 2016	Failure of 4kV Shutdown Board Normal Feeder Breaker Results in Actuations of Emergency Diesel Generators and Containment Isolation Valves LER 16-001-00 for Browns Ferry, Unit 1, Regarding Failure of 4kV Shutdown Board Normal Feeder Breaker Results in Actuations of Emergency Diesel Generators and Containment Isolation Valves	Time of Discovery
05000259/LER-2016-002	19 September 2016	High Pressure Coolant Injection Safety System Functional Failure due to Inoperability of Primary Containment Isolation Valve LER 16-002-00 for Browns Ferry, Unit 1, Regarding High Pressure Coolant Injection Safety System Functional Failure Due to Inoperability of Primary Containment Isolation Valve	Time of Discovery Stroke time Fuel cladding
05000259/LER-2017-002	27 April 2017	Unauthorized Firearm Introduced into the Protected Area LER 17-002-00 for Browns Ferry, Unit 1, Regarding Unauthorized Firearm Introduced into the Protected Area	Safe Shutdown Time of Discovery Fitness for Duty Contraband
05000260/LER-2015-002	17 March 2016	High Pressure Coolant Injection System Inoperable due to Manual Isolation of Steam Leak I LER 15-002-01 for Browns Ferry, Unit 2, Regarding High Pressure Coolant Injection System Inoperable Due to Manual Isolation of Steam Leak	Safe Shutdown Time of Discovery Packing leak Mission time Past operability
05000260/LER-2016-001	16 August 2016	High Pressure Coolant Injection Safety System Functional Failure due to a Blown Fuse and a Failed Relay LER 16-001-00 for Browns Ferry, Unit 2, Regarding High Pressure Coolant Injection Safety System Functional Failure Due to a Blown Fuse and a Failed Relay	Safe Shutdown Time of Discovery Test box
05000260/LER-2016-002	13 September 2016	High Pressure Coolant Injection System Failure Due To Stuck Contactor LER 16-002-00 for Browns Ferry Nuclear Plant, Unit 2, Regarding High Pressure Coolant Injection System Failure Due To Stuck Contactor	Time of Discovery Fuel cladding
05000260/LER-2017-001	14 April 2017	High Pressure Coolant Injection Safety System Functional Failure Due to a Blown Fuse LER 17-001-00 for Browns Ferry, Unit 2, Regarding High Pressure Coolant Injection Safety System Functional Failure Due to a Blown Fuse	Safe Shutdown Time of Discovery
05000260/LER-2017-002	24 April 2017	Inoperable Primary Containment Isolation Valve Resulting in Condition Prohibited by Technical Specifications LER 17-002-00 for Browns Ferry, Unit 2, Regarding Inoperable Primary Containment Isolation Valve Resulting in Condition Prohibited by Technical Specifications	Safe Shutdown Time of Discovery Mission time Past operability
05000260/LER-2017-003	30 May 2017	Manual Reactor Scram Initiated During Startup Due to Multiple Rods Inserting LER 17-003-00 for Browns Ferry Nuclear Plant, Unit 2 Regarding Manual Reactor Scram Initiated During Startup Due to Multiple Rods Inserting	Safe Shutdown Time of Discovery Half scram
05000260/LER-2017-004	7 July 2017	Main Steam Relief Valves Lift Settings Outside of Technical Specifications Required Setpoints LER 17-004-00 for Browns Ferry, Unit 2, Regarding Main Steam Relief Valves Lift Settings Outside of Technical Specifications Required Setpoints	Safe Shutdown Time of Discovery Coatings Corrosion bonding
05000296/LER-2016-001	21 March 2016	Inoperable Residual Heat Removal Pump Results in Condition Prohibited by Technical Specifications and Safety System Functional Failure LER 16-001-00 for Browns Ferry, Unit 3, Regarding Inoperable Residual Heat Removal Pump Results in Condition Prohibited by Technical Specifications and Safety System Functional Failure	Safe Shutdown Time of Discovery Past operability Probabilistic Risk Assessment
05000296/LER-2016-002	22 April 2016	Improperly Installed Switch Results in Condition Prohibited by Technical Specifications LER 16-002-00 for Browns Ferry Nuclear Plant, Unit 3, Regarding Improperly Installed Switch Results in Condition Prohibited by Technical Specifications	Safe Shutdown Time of Discovery Past operability
05000296/LER-2016-003	25 April 2016	Main Steam Isolation Valve Leaking in Excess of Technical Specification Requirements LER 16-003-00 for Browns Ferry Nuclear Plant Unit 3 Regarding Main Steam Isolation Valve Leaking in Excess of Technical Specification Requirements	Safe Shutdown
05000296/LER-2016-004	6 June 2016	Main Steam Relief Valves Lift Settings Outside of Technical Specifications Required Setpoints LER 16-004-00 for Browns Ferry, Unit 3, Regarding Main Steam Relief Valves Lift Settings Outside of Technical Specifications Required Setpoints	Safe Shutdown Time of Discovery Coatings Corrosion bonding
05000296/LER-2016-005	17 June 2016	Automatic Depressurization System Valve Inoperability Exceeded Technical Specification Limits LER 16-005-00 for Browns Ferry, Unit 3, Regarding Automatic Depressurization System Valve Inoperability Exceeded Technical Specification Limits	Safe Shutdown Time of Discovery Past operability
05000296/LER-2017-001	31 October 2017	Inoperable Residual Heat Removal Pump Results in Condition Prohibited by Technical Specifications LER 17-001-00 for Browns Ferry Nuclear Plant, Unit 3, Regarding Inoperable Residual Heat Removal Pump Results in Condition Prohibited by Technical Specifications	Safe Shutdown Time of Discovery Past operability Probabilistic Risk Assessment Large early release frequency
05000296/LER-2017-002	29 December 2017	4kV Shutdown Board Potential Transformer Primary Fuses Do Not Coordinate with Secondary Fuses LER 17-002-00 for Browns Ferry Nuclear Plant, Unit 3 Regarding 4kV Shutdown Board Potential Transformer Primary Fuses Do Not Coordinate with Secondary Fuses	Safe Shutdown Unanalyzed Condition Time of Discovery Large early release frequency
05000327/LER-2015-004	22 January 2016	Manual Reactor Trip due to Main Steam Isolation Valve Drifting in the Closed Direction LER 15-004-00 for Sequoyah, Unit 1, Regarding Manual Reactor Trip Due to Main Steam Isolation Valve Drifting in the Closed Direction	Safe Shutdown Post Accident Monitoring
05000327/LER-2016-001	11 April 2016	Automatic Safety Injection due to Low Steam Line Pressure on Loop 2 Main Steam LER 16-001-00 for Sequoyah, Unit 1, Regarding Automatic Safety Injection due to Low Steam Line Pressure on Loop 2 Main Steam	Safe Shutdown
05000327/LER-2017-001	26 April 2017	Breached Door Renders Both Trains of the Auxiliary Building Gas Treatment System Inoperable LER 17-001-00 for Sequoyah, Unit 1, Regarding Breached Door Renders Both Trains of the Auxiliary Building Gas Treatment System Inoperable	Safe Shutdown Probabilistic Risk Assessment Continuous fire watch
05000327/LER-2017-002	14 July 2017	Automatic Actuation of Emergency Diesel Generators Due to Loss of Power to 6.9kV Shutdown Board LER 17-002-00 for Sequoyah, Unit 1, Regarding Automatic Actuation of Emergency Diesel Generators Due to Loss of Power to 6.9kV Shutdown Board	Safe Shutdown
05000327/LER-2021-001, & LER 2021-001-00 for Sequoyah Nuclear Plant, Units 1 & 2, Ice Bed Inoperable Due to Exceeding Surveillance Requirement Frequency	22 September 2021	& LER 2021-001-00 for Sequoyah Nuclear Plant, Units 1 & 2, Ice Bed Inoperable Due to Exceeding Surveillance Requirement Frequency	Safe Shutdown
05000327/LER-2021-002, Letter Forwarding LER 2021-002-00 & LER 2021-001-00 for Sequoyah Nuclear Plant, Units 1 & 2	22 September 2021	Letter Forwarding LER 2021-002-00 & LER 2021-001-00 for Sequoyah Nuclear Plant, Units 1 & 2
05000328/LER-2015-002	6 January 2016	Unanalyzed Condition Due To Inoperable Containment Recirculation Drains LER 15-002-00 for Sequoyah, Unit 2, Regarding Unanalyzed Condition Due to Inoperable Containment Recirculation Drains	Safe Shutdown Unanalyzed Condition
05000390/LER-2016-001	9 March 2016	Channel Mode Switch in Incorrect Position Renders Lower Containment Atmosphere Particulate Radiation Monitor Inoperable LER 16-001-00 for Watts Bar, Unit 1, Regarding Channel Mode Switch in Incorrect Position Renders Lower Containment Atmosphere Particulate Radiation Monitor Inoperable	Safe Shutdown Grab sample
05000390/LER-2016-003	10 May 2016	Technical Specification Surveillance Requirement Not Met During Emergency Core Cooling System Venting LER 16-003-00 for Watts Bar, Unit 1, Regarding Technical Specification Surveillance Requirement Not Met During Emergency Core Cooling System Venting	Safe Shutdown Probabilistic Risk Assessment Temporary Modification Missed surveillance
05000390/LER-2016-004	23 May 2016	Automatic Reactor Trip Due to Actuation of Over Temperature Delta Temperature Bistables LER 16-004-00 for Watts Bar, Unit 1, Regarding Automatic Reactor Trip Due to Actuation of Over Temperature Delta Temperature Bistables	Safe Shutdown
05000390/LER-2016-005	13 May 2016	Both Trains of Unit 1 Emergency Gas Treatment System Inoperable During Unit 2 Testing LER 16-005-00 for Watts Bar, Unit 1, Regarding Both Trains of Unit 1, Emergency Gas Treatment System Inoperable During Unit 2, Testing	Safe Shutdown Stroke time Safe Shutdown Earthquake Past operability
05000390/LER-2016-006	30 June 2016	Undersized Room Cooler Fan Shaft Results in Loss of Centrifugal Charging Pump LER 16-006-00 for Watts Bar, Unit 1, Regarding Undersized Room Cooler Fan Shaft Results in Loss of Centrifugal Charging Pump	Safe Shutdown Mission time Past operability
05000390/LER-2016-007	20 June 2016	Technical Specification Action Not Met for Rod Position Indication LER 16-007-00 for Watts Bar Nuclear Plant, Unit 1 Regarding Technical Specification Action Not Met for Rod Position Indication	Safe Shutdown Rod Drop Event
05000390/LER-2016-008	15 July 2016	Emergency Diesel Generator Manual Start Due to Loss of Voltage on the 6.9kV Shutdown Board 1B-B LER 16-008-00 for Watts Bar, Unit 1, Regarding Emergency Diesel Generator Manual Start Due to Loss of Voltage on the 6.9kV Shutdown Board 1B-B	Safe Shutdown Open Phase Condition
05000390/LER-2016-009	15 July 2016	Failure to Complete Surveillance Requirements Causes a Condition Prohibited by the Technical Specifications LER 16-009-00 for Watts Bar, Unit 1, Regarding Failure to Complete Surveillance Requirements Causes Conditions Prohibited by the Technical Specifications	Missed surveillance
05000390/LER-2016-010	8 August 2016	Emergency Diesel Generator Crankcase Pressure Switches Not Analyzed to Withstand the Effects of a Tornado LER-16-010-00 for Watts Bar Nuclear Plant, Units 1 and 2 Regarding Emergency Diesel Generator Crankcase Pressure Switches Not Analyzed to Withstand the Effects of a Tornado	Safe Shutdown Unanalyzed Condition
05000390/LER-2016-011	9 December 2016	Loss of Centrifugal Charging Pump Due to Repeat Failure of Associated Room Cooler LER 16-011-01 for Watts Bar Nuclear Plant, Unit 1 Regarding Loss of Centrifugal Charging Pump Due to Repeat Failure of Associated Room Cooler	Safe Shutdown Mission time Past operability
05000390/LER-2017-001	14 February 2017	Failure of Emergency Raw Cooling Water Pump Reverse Rotation Keys Represents Potential Common Cause Inoperability Watts Bar, Units 1 and 2 - Cancellation of Licensee Event Report 390/2017-001 Related to Essential Raw Cooling Water Pump Reverse Rotation Keys Representing a Potential Common Cause lnoperability	Safe Shutdown
05000390/LER-2017-002	22 February 2017	Incorrectly Hung Clearance Leads to a Condition Prohibited by the Technical Specifications LER 17-002-00 for Watts Bar Nuclear Plant, Unit 1, Regarding: Incorrectly Hung Clearance Leads to a Condition Prohibited by the Technical Specifications	Safe Shutdown
05000390/LER-2017-003	3 March 2017	Inadequate Operability Determination Leads to a Condition Prohibited by the Technical Specifications LER 17-003-00 for Watts Bar, Unit 1, Regarding Inadequate Operability Determination Leads to a Condition Prohibited by the Technical Specifications	Safe Shutdown Safe Shutdown Earthquake Functionality Assessment Pressure boundary leak Through-Wall Leak
05000390/LER-2017-004	31 August 2017	Manual Reactor Trips Due to Failed Reactor Coolant Pump Power Transfer During Plant Startup LER 17-004-01 for Watts Bar, Unit 1, Regarding Manual Reactor Trips Due to Failed Reactor Coolant Pump Power Transfer During Plant Startup	Safe Shutdown Anticipated operational occurrence
05000390/LER-2017-005	10 July 2017	Isolation of the 1 B-B Safety Injection Pump Leads to Condition Prohibited by Technical Specifications LER 17-005-00 for Watts Bar re Isolation of the 1B-B Safety Injection Pump Leads to a Condition Prohibited by Technical Specifications	Safe Shutdown
05000390/LER-2017-006	31 July 2017	Structural Degradation of 161 kV Line Pole Leads to a Condition Prohibited by Technical Specifications LER 17-006-00 for Watts Bar, Unit 1, Regarding Structural Degradation of 161 kV Line Pole Leads to a Condition Prohibited by Technical Specifications	Safe Shutdown
05000390/LER-2017-007	8 August 2017	Multiple Unreported Potential Loss of Safety Function Events Associated with Inoperable Single Train Systems Due to Misinterpretation of Reporting Guidance LER 17-007-00 for Watts Bar, Unit 1, Regarding Multiple Unreported Potential Loss of Safety Function Events Associated with Inoperable Single Train Systems Due to Misinterpretation of Reporting Guidance	Safe Shutdown Rod Drop Event
05000390/LER-2017-008	14 August 2017	Shield Building Inoperability and Potential Loss of Safety Function Resulting from Spurious Equipment Operation LER 17-008-00 for Watts Bar, Unit 1, Regarding Shield Building Inoperability and Potential Loss of Safety Function Resulting from Spurious Equipment Operation	Safe Shutdown
05000390/LER-2017-010	10 October 2017	Actuation of Turbine Driven Auxiliary Feedwater Pump Due to Loss of 6.9kV Shutdown Board LER 17-010-00 for Watts Bar Nuclear Plant, Unit 1 Regarding Actuation of Turbine Driven Auxiliary Feedwater Pump Due to Loss of 6.9kV Shutdown Board	Safe Shutdown
05000390/LER-2017-011	23 October 2017	Failure to Enter Technical Specification 3.6.3 for Containment Isolation Valve LER 17-011-00 for Watts Bar, Unit 1, Regarding Failure to Enter Technical Specification 3.6.3 for Containment lsolation Valve	Safe Shutdown Time of Discovery
05000390/LER-2017-012	23 October 2017	Error in Plant Emergency Procedures Leads to a Condition Prohibited by the Technical Specifications LER 17-012-00 for Watts Bar, Unit 1, Regarding Error in Plant Emergency Procedures Leads to a Condition Prohibited by the Technical Specifications	Safe Shutdown Past operability Probabilistic Risk Assessment
05000390/LER-2017-013	24 January 2018	1 OF 5 LER 17-013-01 for Watts Bar Nuclear Plant, Units 1 and 2 Regarding Incorrectly Adjusted Auxiliary Building Gas Treatment System Damper Leads to a Condition Prohibited by Technical Specifications	Safe Shutdown Safe Shutdown Earthquake Past operability Probabilistic Risk Assessment
05000390/LER-2017-014	20 December 2017	Main Control Room Boundary Door Left Open Leading to a Loss of Safety Function LER 17-014-00 for Watts Bar, Unit 1, Regarding Main Control Room Boundary Door Left Open Leading to a Loss of Safety Function	Safe Shutdown Probabilistic Risk Assessment
05000390/LER-2017-015	8 January 2018	Failure to Enter Limiting Condition of Operation Action Statement Results in a Condition Prohibited by Technical Specifications LER 17-015-00 for Watts Bar, Units 1 and 2, Regarding Failure to Enter Limiting Condition of Operation Action Statement Results in a Condition Prohibited by Technical Specifications	Safe Shutdown
05000391/LER-2016-001	13 June 2016	Loss of Automatic Containment Isolation for the Steam Generator Blowdown Sampling Lines LER 16-001-00 for Watts Bar, Unit 2, Regarding Loss of Automatic Containment Isolation for the Steam Generator Blowdown Sampling Lines	Safe Shutdown
05000391/LER-2016-002	11 July 2016	Turbine Driven Auxiliary Feedwater Pump Inoperable for Longer than Allowable Outage Time due to Turbine Speed Control Failure LER 16-002-00 for Watts Bar, Unit 2, Regarding Turbine Driven Auxiliary Feedwater Pump Inoperable for Longer Than Allowable Outage Time Due to Turbine Speed Control Failure	Safe Shutdown Past operability

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