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 Issue dateTitleTopic
05000346/LER-2017-00227 November 2017Auxiliary Feed Water Pump Turbine Bearing Damaged due to Improperly Marked Lubricating Oil Sight Glass
LER 17-002-00 For Davis-Besse Nuclear Power Station, Unit 1, Regarding Auxiliary Feed Water Pump Turbine Bearing Damaged due to Improperly Marked Lubricating Oil Sight Glass
Time of Discovery
Mission time
Probabilistic Risk Assessment
Large early release frequency
05000346/LER-2017-00118 September 2017Emergency Diesel Generator Fuel Oil Storage Tank Vents Not Adequately Protected from Tornado-Generated Missiles
LER 17-001-00 for Davis-Besse, Unit 1, Regarding Emergency Diesel Generator Fuel Oil Storage Tank Vents Not Adequately Protected from Tornado-Generated Missiles
Safe Shutdown
Unanalyzed Condition
High winds
Tornado Missile
Enforcement Discretion
Tornado Generated Missile
Tornado Missile Protection
05000346/LER-2016-00827 February 2017Application of Technical Specification for the Safety Features Actuation System Instrumentation
LER 16-008-01 for Davis-Besse Nuclear Power Station Unit 1 Regarding Application of Technical Specification for the Safety Features Actuation System Instrumentation
Enforcement Discretion
Functionality Assessment
05000346/LER-2016-0099 November 2016Reactor Trip due to Rainwater Intrusion and Auxiliary Feedwater Actuation on High Steam Generator Level
LER 16-009-00 for Davis-Besse Nuclear Power Station, Unit 1 Regarding Reactor Trip due to Rainwater Intrusion and Auxiliary Feedwater Actuation on High Steam Generator Level
Probabilistic Risk Assessment
Temporary Modification
Large early release frequency
05000346/LER-2016-00722 August 2016Pressurizer Code Safety Valve Setpoint Test Failures
LER 16-007-00 for Davis-Besse, Unit 1 Regarding Pressurizer Code Safety Valve Setpoint Test Failures
Time of Discovery
Past operability
Probabilistic Risk Assessment
05000346/LER-2016-00615 August 2016Potential to Trip Emergency Diesel Generator on High Crankcase Pressure
LER 16-006-00 for Davis-Besse Nuclear Power Station Unit 1 RE: Potential to Trip Emergency Diesel Generator on High Crankcase Pressure
Safe Shutdown
Unanalyzed Condition
Temporary Modification
05000346/LER-2016-00511 July 2016- , Plant Startup with Anticipatory Reactor Trip System in Main Turbine Bypass
LER 16-005-00 for Davis-Besse, Unit 1, Regarding Plant Startup with Anticipatory Reactor Trip System in Main Turbine Bypass
Time of Discovery
Probabilistic Risk Assessment
05000346/LER-2016-0046 June 2016Reactor Coolant System Hot Leg Resistance Temperature Detector Wire Insulation Degradation
LER 16-004-00 for Davis-Besse Nuclear Power Station, Unit 1 Regarding Reactor Coolant System Hot Leg Resistance Temperature Detector Wire Insulation Degradation
Safe Shutdown
Time of Discovery
Anticipated operational occurrence
Post Accident Monitoring
05000346/LER-2016-00331 May 2016Leak from Reactor Coolant Pump Seal Piping Flexible Hose due to Undetected Manufacture Weld Defect
LER 16-003-00 for Davis-Besse Nuclear Power Station, Unit 1 Regarding Leak from Reactor Coolant Pump Seal Piping Flexible Hose due to Undetected Manufacture Weld Defect
Boric Acid
Time of Discovery
Hydrostatic
Liquid penetrant
Pressure Boundary Leakage
Pressure boundary leak
05000346/LER-2016-00229 March 2016Unanticipated Steam and Feedwater Rupture Control System Actuation
LER 16-002-00 for Davis-Besse Nuclear Power Station, Unit 1, Regarding Unanticipated Steam and Feedwater Rupture Control System Actuation
05000346/LER-2016-00129 March 20161 OF 7
LER 16-001-00 for Davis-Besse Nuclear Power Station Unit 1 Regarding Reactor Trip During Nuclear Instrumentation Calibrations and Steam Feedwater Rupture Control System Actuation on High Steam Generator Level
Anticipated operational occurrence
Large early release frequency
ML04090034226 March 2004LER 97-004-01 for Davis-Besse, Unit 1 Regarding Reactor Coolant Pump Motor Oil Piping Not Protected from Leakage as Required Per 10CFR50, Appendix RSafe Shutdown
Exemption Request
Fire Watch
Power change
ML04049019313 February 2004LER 99-003-01 for Davis-Besse, Unit 1 Regarding Failure to Perform Engineering Evaluation for Pressurizer Cooldown Rate Exceeding Technical Specification Limit
ML0331701987 November 2003LER 98-002-01 for Davis-Besse Unit 1 Regarding Plant Trip Due to High Pressurizer Level as a Result of Loss of Letdown CapabilityBoric Acid
Condition Adverse to Quality