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| Issue date | Title | Topic | |
|---|---|---|---|
| 05000391/LER-2017-005 | 25 January 2018 | Unplanned Emergency Core Cooling System Injection into the Reactor Coolant System due to Personnel Error LER 17-005-00 for Watts Bar, Unit 2, Regarding Unplanned Emergency Core Cooling System Injection into the Reactor Coolant System due to Personnel Error | Safe Shutdown |
| 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 |
| 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-2017-012 | 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-2017-011 | 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-2017-010 | 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 |
| 05000391/LER-2017-004 | 25 September 2017 | Manual Reactor Trip Due to Inoperable Rod Position Indication LER 17-004-00 for Watts Bar Nuclear Plant, Unit 2 Regarding Manual Reactor Trip Due to Inoperable Rod Position Indication | Safe Shutdown Anticipated operational occurrence |
| 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-2017-008 | 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-2017-007 | 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-2017-006 | 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-2017-005 | 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 |
| 05000391/LER-2017-003 | 22 May 2017 | Automatic Start of Auxiliary Feedwater System Due to Main Condenser Failure LER 17-003-00 for Watts Bar, Unit 2, Regarding Automatic Start of Auxiliary Feedwater System Due to Main Condenser Failure | Safe Shutdown Anticipated operational occurrence |
| 05000391/LER-2017-002 | 12 May 2017 | Manual Reactor Trip as a Result of a Secondary Plant Transient LER 17-002-00 for Watts Bar, Unit 2, Regarding Manual Reactor Trip as a Result of a Secondary Plant Transient | Safe Shutdown Anticipated operational occurrence Power change |
| 05000391/LER-2017-001 | 3 May 2017 | Containment Airlock Function Lost Due to Equalizing Valve Not Closing LER 17-001-00 for Watts Bar, Unit 2, Regarding Containment Airlock Function Lost Due to Equalizing Valve Not Closing | 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-2017-002 | 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-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 |
| 05000391/LER-2016-008 | 28 October 2016 | Reactor Trip Resulting from Failure of 2B Main Bank Transformer LER 16-008-00 for Watts Bar, Unit 2, Regarding Reactor Trip Resulting from Failure of 2B Main Bank Transformer | Safe Shutdown |
| 05000391/LER-2016-005 | 19 August 2016 | Main Feedwater Pump Trip on Loss of Condenser Vacuum Leads to Turbine Trip and Reactor Trip LER 16-005-00 for Watts Bar, Unit 2, Regarding Main Feedwater Pump Trip on Loss of Condenser Vacuum Leads to Turbine Trip and Reactor Trip | Safe Shutdown |
| 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 |
| 05000391/LER-2016-004 | 4 August 2016 | Reactor Trip and Safety Injection Actuation Caused by Turbine Governor Valve Failure LER 16-004-00 for Watts Bar, Unit 2, Regarding Reactor Trip and Safety Injection Actuation Caused by Turbine Governor Valve Failure | Safe Shutdown Flow Induced Vibration |
| 05000391/LER-2016-003 | 27 July 2016 | Turbine Driven Auxiliary Feedwater Pump Inoperable for Longer than Allowable Outage Time due to Governor Valve Spring Over-Tensioning LER 16-003-00 for Watts Bar, Unit 2, Regarding Turbine Driven Auxiliary Feedwater Pump lnoperable for Longer Than Allowable Outage Time Due to Governor Valve Spring Over-Tensioning | Safe Shutdown Past operability |
| 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 |
| 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 |
| 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 |
| 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 |
| 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-2016-003 | 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-2016-002 | 4 May 2016 | Technical Specification Action Not Met for Inoperable Containment Isolation Valve LER 16-002-00 for Watts Bar, Unit 1, Regarding Technical Specification Action Not Met for Inoperable Containment Isolation Valve | Safe Shutdown |
| 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 |
| ML113470343 | 13 December 2011 | Withdrawal of License Event Report 390/2011-003, Mode Change Without Meeting Limiting Condition for Operation (LCO) 3.7.5 |