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| Issue date | Title | Topic | |
|---|---|---|---|
| 05000317/LER-1990-019 | 20 July 1990 | LER 90-019-00:on 900622,determined That Inadequate Breaker Coordination Resulted in Condition Outside Design Basis. Root Cause of Improperly Sized Breaker Not Determined. W/900720 Ltr | Time of Discovery |
| 05000318/LER-1987-005, Revised LER 87-005-00,correcting Block 15 to Reflect 870501 as Supplemental Rept Expected Submittal Date | 6 August 1987 | Revised LER 87-005-00,correcting Block 15 to Reflect 870501 as Supplemental Rept Expected Submittal Date | |
| 05000317/LER-1984-004, Updated LER 84-004-01:on 840228,charging Pumps 12 & 13 Taken Out of Svc Due to Excessive Packing Leakage.Caused by Plunger Packing Failure.Evaluation of Alternative Charging Pump Packing Matls in Progress | 25 April 1984 | Updated LER 84-004-01:on 840228,charging Pumps 12 & 13 Taken Out of Svc Due to Excessive Packing Leakage.Caused by Plunger Packing Failure.Evaluation of Alternative Charging Pump Packing Matls in Progress | |
| 05000318/LER-1983-043, Updated LER 83-043/03X-1:on 830809,following Reactor Trip, Steam Generator Safety Valve Failed to Reseat.Caused by Missing Pin.Valves Inspected to Ensure That Blowdown Ring & Pin Not worn.W/840330 Ltr | 30 March 1984 | Updated LER 83-043/03X-1:on 830809,following Reactor Trip, Steam Generator Safety Valve Failed to Reseat.Caused by Missing Pin.Valves Inspected to Ensure That Blowdown Ring & Pin Not worn.W/840330 Ltr | |
| 05000318/LER-1983-046, Updated LER 83-046/03X-1:on 830906,penetration Room Exhaust Fan 21 Would Not Start on Containment Isolation Sys Signal While Performing Surveillance Test STP-0-22.Caused by Intermittently Failing Module.Module removed.W/840330 | 30 March 1984 | Updated LER 83-046/03X-1:on 830906,penetration Room Exhaust Fan 21 Would Not Start on Containment Isolation Sys Signal While Performing Surveillance Test STP-0-22.Caused by Intermittently Failing Module.Module removed.W/840330 Ltr | |
| 05000317/LER-1983-046, Updated LER 83-046/01X-1:on 830816,swing Diesel Generator 12 Shut Down on Loss of Fuel Oil During Surveillance.Caused by Isolation of Day Tank Level Switches,Preventing Fuel Oil Transfer Pump & Low Level Alarm actuation.W/84033 | 30 March 1984 | Updated LER 83-046/01X-1:on 830816,swing Diesel Generator 12 Shut Down on Loss of Fuel Oil During Surveillance.Caused by Isolation of Day Tank Level Switches,Preventing Fuel Oil Transfer Pump & Low Level Alarm actuation.W/840330 Ltr | |
| 05000317/LER-1981-058, Updated LER 81-058/03X-1:on 810721,emergency Diesel Generator 12 to 4 Kv Bus 21 out-of-svc.Caused by Stuck Auxiliary Contact in Emergency Diesel Generator 12 Output Breaker to 4 Kv Bus 14.Switch replaced.W/840330 Ltr | 30 March 1984 | Updated LER 81-058/03X-1:on 810721,emergency Diesel Generator 12 to 4 Kv Bus 21 out-of-svc.Caused by Stuck Auxiliary Contact in Emergency Diesel Generator 12 Output Breaker to 4 Kv Bus 14.Switch replaced.W/840330 Ltr | |
| 05000317/LER-1983-034, Updated LER 83-034/03X-1:on 830525,ECCS Pump Room Cooler 12 Taken Out of Svc.Cause Unknown.Supply Piping & Strainers Disassembled,Inspected & Cleaned.New Mechanical Preventive Maint Procedures implemented.W/840306 Ltr | 6 March 1984 | Updated LER 83-034/03X-1:on 830525,ECCS Pump Room Cooler 12 Taken Out of Svc.Cause Unknown.Supply Piping & Strainers Disassembled,Inspected & Cleaned.New Mechanical Preventive Maint Procedures implemented.W/840306 Ltr | |
| 05000318/LER-1981-025, Updated LER 81-025/03X-1:on 810430 & 0514,reactor Protective Sys Channel B Trip Units 1,3,7,8 & 10 Bypassed to Investigate Problem w/T-hot Channel B.Caused by Failure of Two Oscillators in Transmitter Circuitry | 5 March 1984 | Updated LER 81-025/03X-1:on 810430 & 0514,reactor Protective Sys Channel B Trip Units 1,3,7,8 & 10 Bypassed to Investigate Problem w/T-hot Channel B.Caused by Failure of Two Oscillators in Transmitter Circuitry | |
| 05000317/LER-1981-032, Updated LER 81-032/03X-1:on 810420,reactor Protective Sys Channel D Hi Power Thermal Margin/Low Pressure & Axial Shape Index Trip Units Bypassed for Maint.Caused by Oscillator Noise in transmitter.W/840305 Ltr | 5 March 1984 | Updated LER 81-032/03X-1:on 810420,reactor Protective Sys Channel D Hi Power Thermal Margin/Low Pressure & Axial Shape Index Trip Units Bypassed for Maint.Caused by Oscillator Noise in transmitter.W/840305 Ltr | |
| 05000317/LER-1983-037, Updated LER 83-037/03X-1:on 830718,response Time of Trip Circuit Breakers 3 & 4 Undervoltage Trip Devices Slower than Tech Spec Limits.Caused by Setpoint Drift.Setpoints adjusted.W/840305 Ltr | 5 March 1984 | Updated LER 83-037/03X-1:on 830718,response Time of Trip Circuit Breakers 3 & 4 Undervoltage Trip Devices Slower than Tech Spec Limits.Caused by Setpoint Drift.Setpoints adjusted.W/840305 Ltr | |
| 05000318/LER-1983-036, Updated LER 83-036/03X-1:on 830719,response Time for Reactor Trip Circuit Breakers 4 & 7 Undervoltage Devices Indicated Slower than Tech Spec Limits.Caused by Setpoint Drift & Worn Front Frame Assembly mechanisms.W/840305 Ltr | 5 March 1984 | Updated LER 83-036/03X-1:on 830719,response Time for Reactor Trip Circuit Breakers 4 & 7 Undervoltage Devices Indicated Slower than Tech Spec Limits.Caused by Setpoint Drift & Worn Front Frame Assembly mechanisms.W/840305 Ltr | |
| 05000317/LER-1983-049, Updated LER 83-049/03X-1:on 830818,auxiliary Feedwater Pump 11 Found Inoperable.Caused by Stage & Shaft piece-balance Being Bound Up.Parts replaced.W/840305 Ltr | 5 March 1984 | Updated LER 83-049/03X-1:on 830818,auxiliary Feedwater Pump 11 Found Inoperable.Caused by Stage & Shaft piece-balance Being Bound Up.Parts replaced.W/840305 Ltr | |
| 05000318/LER-1981-030, Updated LER 81-030/03X-1:on 810305,discovered Temp Transmitter 122HB Out of Tolerance in Nonconservative Direction.Caused Two Oscillators Producing Noise on Transmitter Output.Transmitter replaced.W/840305 Ltr | 5 March 1984 | Updated LER 81-030/03X-1:on 810305,discovered Temp Transmitter 122HB Out of Tolerance in Nonconservative Direction.Caused Two Oscillators Producing Noise on Transmitter Output.Transmitter replaced.W/840305 Ltr | |
| 05000318/LER-1983-074, Updated LER 83-074/03X-1:on 831223,main Steam Supply Valve to Steam Driven Auxiliary Feedwater (AFW) Pumps Failed, Causing AFW Pump 21 to Start.Caused by Insufficient Torque on Casing Cap Screws.New Diaphragm installed.W/840209 | 9 February 1984 | Updated LER 83-074/03X-1:on 831223,main Steam Supply Valve to Steam Driven Auxiliary Feedwater (AFW) Pumps Failed, Causing AFW Pump 21 to Start.Caused by Insufficient Torque on Casing Cap Screws.New Diaphragm installed.W/840209 Ltr | |
| 05000317/LER-1983-047, Updated LER 83-047/03X-1:on 830822,control Room Air Conditioner Compressor 12 Failed to Run W/Start Signal. Caused by Compressor Trip Due to High Pressure.High Pressure Switch reset.W/840126 Ltr | 26 January 1984 | Updated LER 83-047/03X-1:on 830822,control Room Air Conditioner Compressor 12 Failed to Run W/Start Signal. Caused by Compressor Trip Due to High Pressure.High Pressure Switch reset.W/840126 Ltr | |
| 05000318/LER-1983-064, Updated LER 83-064/03X-1:on 831105,after Obtaining Results of Unit 1 HPSI Flow Balance Test,Six Unit 2 HPSI Header Isolation Valves Required Adjustment.Caused by Inadequate Procedures.Maint Procedures revised.W/840124 Ltr | 24 January 1984 | Updated LER 83-064/03X-1:on 831105,after Obtaining Results of Unit 1 HPSI Flow Balance Test,Six Unit 2 HPSI Header Isolation Valves Required Adjustment.Caused by Inadequate Procedures.Maint Procedures revised.W/840124 Ltr | |
| 05000318/LER-1983-052, Revised LER 83-052/03X-1:on 830928,auxiliary Feedwater Pump 23 Found Inoperable Due to Tripped Protective Relays. Probably Caused by Workers Shorting Internal Breaker Circuits When Working Scaffolding W/Door open.W/831028 Ltr | 28 October 1983 | Revised LER 83-052/03X-1:on 830928,auxiliary Feedwater Pump 23 Found Inoperable Due to Tripped Protective Relays. Probably Caused by Workers Shorting Internal Breaker Circuits When Working Scaffolding W/Door open.W/831028 Ltr | Scaffolding |
| 05000318/LER-1983-007, Followup LER 83-007/01T-0:on 830203,de-energization of Reactor Protection Sys (RPS) Channels Caused PORV & Pressurizer Quench Tank Rupture Disk to Open.Caused by Blown Fuse in RPS Channel a Due to Crossed Leads in Inverter 21 | 18 February 1983 | Followup LER 83-007/01T-0:on 830203,de-energization of Reactor Protection Sys (RPS) Channels Caused PORV & Pressurizer Quench Tank Rupture Disk to Open.Caused by Blown Fuse in RPS Channel a Due to Crossed Leads in Inverter 21 | |
| ML20062N318 | 13 August 1982 | LER-021/03L-0:on 820714,22B Safety Injection Tank Pressure Found Decreased to 197 Psig on 820427.Caused by Loop Isolator Failure.Isolator Replaced | |
| 05000317/LER-1982-022, Updated LER 82-022/01T-1:on 820503,total Type B & C Penetration Leakage Calculations Compared to Wrong Spec. Caused by Incorrectly Revised Local Leak Rate Surveillance Test Procedure.Procedure Revised | 22 July 1982 | Updated LER 82-022/01T-1:on 820503,total Type B & C Penetration Leakage Calculations Compared to Wrong Spec. Caused by Incorrectly Revised Local Leak Rate Surveillance Test Procedure.Procedure Revised | |
| ML20062F708 | 14 December 1978 | /01x-0 on 781213:reactor Was Made Critical w/11 Component Cooling Heat Exchanger Out of Svc & 11 Saltwater sub-sys Partially Drained.Caused by Personnel Error | |
| ML20062G119 | 14 December 1978 | /03L-0 on 781117: 5 Halon sub-sys Discharged When Door to 22 Inverter Was Open.Caused by Thermal Detector Being Overly Sensitive to Rate of Rise of Temp.When Door Opened,Internal Airflow Disturbed,Setting Off Detector | Continuous fire watch |
| ML20062E921 | 7 December 1978 | /03L-0 on 781113:during Normal Oper the Containment Particulate Radioactivity Monitor Failed Low at 1110.Caused by Disconnection of Signal Cable to Monitor. Cable Connected & Monitor Returned to Svc | |
| ML20062E896 | 7 December 1978 | /03L-0 on 781115:during Normal Oper Periodic Water Inventory Balance Indicated That Unidentified Reactor Coolant Leakage Was 1.72 Gpm at 0600.Leak Identified as Cracked Weld | |
| ML20062D801 | 24 November 1978 | /03L-0 on 781115:RWT Level Discovered to Be at 455 Inches.Caused by Rad-Chem Technician'S Failure to Fully Close Local Sample Valve After Drawing Routine Sample. Technician Has Been Reinstructed in Valve Sampling | |
| ML20062D718 | 24 November 1978 | /03L-0 on 781103:in Routine Surveillance test,11 Auxiliary Feed Pump Was Tripped Per Procedure & Oper Was Unable to Reset Throttle Valve Due to Binding.Assembly Was Freed Upon Lubrication of Stem & Nut | |
| ML20062D769 | 17 November 1978 | /03L-0 on 781031:solenoid Valve 1-SV-4043 for Main Steam Isolation Valve Hydraulic Accumulators Was Leaking Due to Failure of 1 of 4 O Ring Seals.Cause of Ring Failure Unknown.All 4 Seals Replaced & Valve Returned to Svc | |
| ML20062D341 | 16 November 1978 | /03L-0 on 781020:pump for Radiat Monitors Seized, Perhaps Due to Graphite Particles from Pump Being Deposited in Bearings.A Normal End of Life Failure.Code Pump Model 6 | |
| ML20062D047 | 13 November 1978 | /01t-0 on 781025:during LPPT in Mode 2,containment Air Lock Was Opened to Repair Failed Oper Mechanism & Was Kept Ajar,Due to Misunderstanding Between Supervisor & Maintenance Personnel.All Personnel Have Been Reinstructed | |
| ML20062D036 | 10 November 1978 | /03L-0 on 781025:during Oper,Reactor Protec Instru Wide Range Logarithmic Neutron Flux Monitor Channel a Read 2 Decades Lower than Other Channels,Due to Connector,For Channel a Not Being Dried Completely When Recently Cleaned | |
| ML20062C804 | 2 November 1978 | /01T-0 on 781023:during Routine Test of Steam Generator Isolation Signal logic,21 Main Steam Isolation Valve Failed to Shut Upon Sgisa & Sgisb Signal or Hand Switch in Control Room,Due to Sticking MSIV Solenoid Valves | |
| ML20062C694 | 24 October 1978 | /01X-0 on 781023:during Inspec of Steam Generator Isolation Signal logic,21 Main Steam Isolation Valves Failed to Shut When Given Sgisa & Sgisb Signal.Cause Undetermined |