| | Site | Start date | Title |
|---|
| 05000333/LER-2023-002-01, Reactor Protection System Electric Power Monitoring System Trip Caused Primary Containment Isolation | FitzPatrick | 14 August 2023 | Reactor Protection System Electric Power Monitoring System Trip Caused Primary Containment Isolation |
| 05000374/LER-2022-003-02, Manual Scram Due to Lsophase Bus Duct Fire Followed by 2A RPS Normal Power Supply Trip | LaSalle | 16 June 2023 | Manual Scram Due to Lsophase Bus Duct Fire Followed by 2A RPS Normal Power Supply Trip |
| 05000374/LER-2021-002-02, Supplement to Reactor Protection System Half Scram Due to Motor Generator Set Output Breaker Trip | LaSalle | 25 May 2023 | Supplement to Reactor Protection System Half Scram Due to Motor Generator Set Output Breaker Trip |
| 05000374/LER-1922-003-01, Manual Scram Due to Lsophase Bus Duct Fire Followed by 2A RPS Normal Power Supply Trip | LaSalle | 9 February 2023 | Manual Scram Due to Lsophase Bus Duct Fire Followed by 2A RPS Normal Power Supply Trip |
| 05000374/LER-2022-003, Manual Scram Due to Lsophase Bus Duct Fire and 2A RPS Normal Power Supply Trip | LaSalle | 15 November 2022 | Manual Scram Due to Lsophase Bus Duct Fire and 2A RPS Normal Power Supply Trip |
| 05000374/LER-2021-002-01, Reactor Protection System Half Scram Due to Motor Generator Set Output Breaker Trip | LaSalle | 23 September 2021 | Reactor Protection System Half Scram Due to Motor Generator Set Output Breaker Trip |
| 05000374/LER-2021-002, Reactor Protection System Half Scram Due to Motor Generator Set Output Breaker Trip | LaSalle | 29 July 2021 | Reactor Protection System Half Scram Due to Motor Generator Set Output Breaker Trip |
| 05000254/LER-1991-028-01, :on 911220,loss of Power to 1A RPS Bus Occurred.Caused by Low Generator Output Voltage.Rheostat Adjusted for Higher Generator Output Voltage & Returned to Svc | Quad Cities | 17 January 1992 |
- on 911220,loss of Power to 1A RPS Bus Occurred.Caused by Low Generator Output Voltage.Rheostat Adjusted for Higher Generator Output Voltage & Returned to Svc
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| 05000277/LER-1988-026-01, :on 881029,primary Containment Isolation Resulted from Undervoltage Trip of Reactor Protection Sys Channel a Due to Sensitive Rheostat.Caused by Craftsman Inadvertently Bumping Voltage Control Rheostat | Peach Bottom | 28 November 1988 |
- on 881029,primary Containment Isolation Resulted from Undervoltage Trip of Reactor Protection Sys Channel a Due to Sensitive Rheostat.Caused by Craftsman Inadvertently Bumping Voltage Control Rheostat
|
| 05000295/LER-1988-011-02, :on 880507,reactor Trip Occurred Due to lo-lo Level in Steam Generator 1B Due to Generator Excitation. Caused by Corrosion on Phase B in Primary Potential Transformer Resistors.Resistors Replaced | Zion | 6 June 1988 |
- on 880507,reactor Trip Occurred Due to lo-lo Level in Steam Generator 1B Due to Generator Excitation. Caused by Corrosion on Phase B in Primary Potential Transformer Resistors.Resistors Replaced
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| 05000277/LER-1988-003-01, :on 880302,ESF Actuation Occurred Due to Undervoltage Trip of Breakers While Adjusting Defective Voltage Rheostat.Caused by Defective Voltage Rheostat. Breakers Closed & Rheostat Replaced | Peach Bottom | 28 March 1988 |
- on 880302,ESF Actuation Occurred Due to Undervoltage Trip of Breakers While Adjusting Defective Voltage Rheostat.Caused by Defective Voltage Rheostat. Breakers Closed & Rheostat Replaced
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| 05000324/LER-1987-001, :on 870105,while Increasing Main Generator Output Voltage,Automatic Reactor Scram Occurred.Caused by Corrosion &/Or Oxide Film on Voltage Regulator Automatic & Manual Potentiometers.Valve Motor Replaced | Brunswick | 8 May 1987 |
- on 870105,while Increasing Main Generator Output Voltage,Automatic Reactor Scram Occurred.Caused by Corrosion &/Or Oxide Film on Voltage Regulator Automatic & Manual Potentiometers.Valve Motor Replaced
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| 05000324/LER-1987-001, :on 870105,while Increasing Main Generator Output Voltage,Automatic Reactor Scram from 100% Power Occurred.Caused by Dirty &/Or Corroded Wiper or Track Surfaces on Automatic & Manual Potentiometers | Brunswick | 1 April 1987 |
- on 870105,while Increasing Main Generator Output Voltage,Automatic Reactor Scram from 100% Power Occurred.Caused by Dirty &/Or Corroded Wiper or Track Surfaces on Automatic & Manual Potentiometers
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| 05000325/LER-1986-024, :on 860913,automatic Reactor Scram Occurred Due to 90% Full Open MSIV Position.Caused by Main Generator Output Voltage Oscillations.Manual Potentiometer Contact Wiper & Slide Assembly Replaced | Brunswick | 13 October 1986 |
- on 860913,automatic Reactor Scram Occurred Due to 90% Full Open MSIV Position.Caused by Main Generator Output Voltage Oscillations.Manual Potentiometer Contact Wiper & Slide Assembly Replaced
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| 05000483/LER-1985-038, :on 850820,generator Trip Resulted in Turbine Trip/Reactor Trip,Feedwater Isolation,Auxiliary Feedwater Actuation & Steam Generator Blowdown Isolation,Due to Loss of Field Excitation.Suspect Circuitry Replaced | Callaway | 18 March 1986 |
- on 850820,generator Trip Resulted in Turbine Trip/Reactor Trip,Feedwater Isolation,Auxiliary Feedwater Actuation & Steam Generator Blowdown Isolation,Due to Loss of Field Excitation.Suspect Circuitry Replaced
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| 05000245/LER-1981-031, Forwards LER 81-031/03L-0.Detailed Event Analysis Encl | Millstone | 9 October 1981 | Forwards LER 81-031/03L-0.Detailed Event Analysis Encl |
| 05000298/LER-1980-043-03, /03L-0:on 801021,motor Operated Valve SW-MO-89B Failed to Open.Caused by Broken Wire Connected to Ohmite 1000-ohm Variable Resistor Inside Valve Operator.Broken Lead Resoldered & Circuit Checked | Cooper | 20 November 1980 | /03L-0:on 801021,motor Operated Valve SW-MO-89B Failed to Open.Caused by Broken Wire Connected to Ohmite 1000-ohm Variable Resistor Inside Valve Operator.Broken Lead Resoldered & Circuit Checked |