| | | Reporting criterion |
|---|
| 05000416/LER-1985-002, :on 850129,while Placing Heater Drain Pump in Forward Mode,Reactor Scrammed Following Trip of Both Operating Reactor Feed Pumps.Caused by Excessive Differential Pressure Across Valve N23-F054 |
- on 850129,while Placing Heater Drain Pump in Forward Mode,Reactor Scrammed Following Trip of Both Operating Reactor Feed Pumps.Caused by Excessive Differential Pressure Across Valve N23-F054
| |
| 05000416/LER-1985-003, :on Five Occasions from Oct 1984 - Jan 1985 Chemistry Personnel Failed to Perform Dose Equivalent Iodine/Isotopic Analyses Following Reactor Scrams.Caused Partially by Confusion Re Tech Spec |
- on Five Occasions from Oct 1984 - Jan 1985 Chemistry Personnel Failed to Perform Dose Equivalent Iodine/Isotopic Analyses Following Reactor Scrams.Caused Partially by Confusion Re Tech Spec
| |
| 05000416/LER-1985-004, :on 850127,during Testing on Feedwater Sys, Reactor Scrammed.Caused by Imbalanced Feed Pump Flow.Level Restored W/Pump in Manual Control |
- on 850127,during Testing on Feedwater Sys, Reactor Scrammed.Caused by Imbalanced Feed Pump Flow.Level Restored W/Pump in Manual Control
| |
| 05000416/LER-1985-005, :on 850129,portion of Intermediate Range Monitor Surveillance Not Performed within Required Limit Following Reactor Scram.Caused by Personnel Error. Surveillance Performed |
- on 850129,portion of Intermediate Range Monitor Surveillance Not Performed within Required Limit Following Reactor Scram.Caused by Personnel Error. Surveillance Performed
| 10 CFR 50.73(a)(2) |
| 05000416/LER-1985-006, :on 850207,RCIC Turbine Steam Supply Inboard Isolation Valve Isolated on Spurious RHR Equipment Area High Ambient Temp Signal.Cause Undetermined.Alarm Invalid & RCIC Sys Returned to Standby |
- on 850207,RCIC Turbine Steam Supply Inboard Isolation Valve Isolated on Spurious RHR Equipment Area High Ambient Temp Signal.Cause Undetermined.Alarm Invalid & RCIC Sys Returned to Standby
| |
| 05000416/LER-1985-007, :on 850210,MSIVs Failed to Close Normally Subsequent to Reactor Scram.Caused by Failure of Dual Solenoid Valves to Transfer When Deenergized.All Valves Replaced.Part 21 Related |
- on 850210,MSIVs Failed to Close Normally Subsequent to Reactor Scram.Caused by Failure of Dual Solenoid Valves to Transfer When Deenergized.All Valves Replaced.Part 21 Related
| |
| 05000416/LER-1985-007-02, Forwards LER 85-007-02,revising Rept Submitted by .Ge Dual Solenoid Valve Number Corrected.Part 21 Related | Forwards LER 85-007-02,revising Rept Submitted by .Ge Dual Solenoid Valve Number Corrected.Part 21 Related | |
| 05000416/LER-1985-008, :on 850213,instrument Air Compressor Tripped Due to Low Cooling Water Pressure While Air Vented from Turbine Bldg Cooling Water Sys.Caused by Loss of Feedwater. Main Turbine Manually Tripped & MSIVs Closed |
- on 850213,instrument Air Compressor Tripped Due to Low Cooling Water Pressure While Air Vented from Turbine Bldg Cooling Water Sys.Caused by Loss of Feedwater. Main Turbine Manually Tripped & MSIVs Closed
| |
| 05000416/LER-1985-008-01, :on 850213,instrument Air Compressor Tripped Due to Low Cooling Water Pressure.Caused by Air Usage Pulling Header Pressure Down Low Enough to Isolate Precoat Filters.Design Enhancements Planned |
- on 850213,instrument Air Compressor Tripped Due to Low Cooling Water Pressure.Caused by Air Usage Pulling Header Pressure Down Low Enough to Isolate Precoat Filters.Design Enhancements Planned
| |
| 05000416/LER-1985-009, :on 850215,ESF Actuated Due to Pressure Disturbance on Instrument Ref Leg.Caused by Technician Restoring Vessel Level Instrument to Svc.All Sys Returned to Normal Status |
- on 850215,ESF Actuated Due to Pressure Disturbance on Instrument Ref Leg.Caused by Technician Restoring Vessel Level Instrument to Svc.All Sys Returned to Normal Status
| |
| 05000416/LER-1985-010, :on 850223,ESF Actuation Occurred Due to Div 2 Inverter Trip on High Voltage.Caused by Relay Reenergizing Before Level Instruments Could Recover |
- on 850223,ESF Actuation Occurred Due to Div 2 Inverter Trip on High Voltage.Caused by Relay Reenergizing Before Level Instruments Could Recover
| |
| 05000416/LER-1985-011, :on 850226,QA Audit Revealed Two Occasions Where Halon Tank Pressures Incorrectly Determined to Be within Acceptance Criteria During Halon Tank Pressure Checks.Caused by Mechanic Errors |
- on 850226,QA Audit Revealed Two Occasions Where Halon Tank Pressures Incorrectly Determined to Be within Acceptance Criteria During Halon Tank Pressure Checks.Caused by Mechanic Errors
| |
| 05000416/LER-1985-013, :on 850403,reactor Scrammed on High Water Level During Startup Testing.Caused by Failure of Level Channel Selector Switch.Switch Replaced & Precautionary Steps Added to Operating Instructions |
- on 850403,reactor Scrammed on High Water Level During Startup Testing.Caused by Failure of Level Channel Selector Switch.Switch Replaced & Precautionary Steps Added to Operating Instructions
| |
| 05000416/LER-1985-014, :on 850401,Tech Spec Limiting Condition of Operation Action Statement Not Reported When Main Steam Line High Flow Isolation Channel a Remained Inoperable Beyond 2 H Limit & Required Trip Signal Not Provided |
- on 850401,Tech Spec Limiting Condition of Operation Action Statement Not Reported When Main Steam Line High Flow Isolation Channel a Remained Inoperable Beyond 2 H Limit & Required Trip Signal Not Provided
| |
| 05000416/LER-1985-015, :on 850404,RCIC Sys Inadvertently Isolated When Bypass Switch Mistakenly Returned to Normal During Testing.Caused by Misunderstanding Between Personnel.Sys Restored.Need for Clear Communication Stressed |
- on 850404,RCIC Sys Inadvertently Isolated When Bypass Switch Mistakenly Returned to Normal During Testing.Caused by Misunderstanding Between Personnel.Sys Restored.Need for Clear Communication Stressed
| |
| 05000416/LER-1985-016, :on 850407,reactor Scrammed Due to Full Steam Line Isolation.Caused by Faulty Pressure Transmitter in Div 2,producing Erroneous Isolation Signal.Transmitter Cleaned,Reterminated,Calibr & Returned to Svc |
- on 850407,reactor Scrammed Due to Full Steam Line Isolation.Caused by Faulty Pressure Transmitter in Div 2,producing Erroneous Isolation Signal.Transmitter Cleaned,Reterminated,Calibr & Returned to Svc
| |
| 05000416/LER-1985-017, :on 850412,charcoal Adsorber Sample Test for Train a Not Removed & Analyzed Per Tech Specs for Control Room Emergency Filtration Sys.Caused by Procedure Error. Procedures Revised |
- on 850412,charcoal Adsorber Sample Test for Train a Not Removed & Analyzed Per Tech Specs for Control Room Emergency Filtration Sys.Caused by Procedure Error. Procedures Revised
| |
| 05000416/LER-1985-018, :on 850414,reactor Scrammed on High Level When Reactor Recirculation Pumps Transferred to Low Frequency Motor Generator Due to Performance of Calibr Procedure. Caused by Error in Procedure |
- on 850414,reactor Scrammed on High Level When Reactor Recirculation Pumps Transferred to Low Frequency Motor Generator Due to Performance of Calibr Procedure. Caused by Error in Procedure
| |
| 05000416/LER-1985-019, :on 850517,reactor Water Cleanup Sys Isolated Due to High Differential Flow Signals.Cause Not Determined. Isolation Verified & Maint Work Order Initiated on 850518 to Inspect Differential Flow Units |
- on 850517,reactor Water Cleanup Sys Isolated Due to High Differential Flow Signals.Cause Not Determined. Isolation Verified & Maint Work Order Initiated on 850518 to Inspect Differential Flow Units
| |
| 05000416/LER-1985-020, :on 850524,reactor Scrammed from Turbine Trip Precipitated by Sequence of Actions Initiated by Loss of Power to nonsafety-related 6.9 Kv Bus.Caused by Inadequate Test Instructions.Pumps Restarted |
- on 850524,reactor Scrammed from Turbine Trip Precipitated by Sequence of Actions Initiated by Loss of Power to nonsafety-related 6.9 Kv Bus.Caused by Inadequate Test Instructions.Pumps Restarted
| |
| 05000416/LER-1985-021, :on 850604,reactor Scrammed Due to Turbine Trip.Caused by Hydraulic Low Condenser Vacuum Trip mechanism.Off-normal Event Procedures Followed & Plant Stabilized.Steam Jet Air Ejector Lines Cleaned |
- on 850604,reactor Scrammed Due to Turbine Trip.Caused by Hydraulic Low Condenser Vacuum Trip mechanism.Off-normal Event Procedures Followed & Plant Stabilized.Steam Jet Air Ejector Lines Cleaned
| |
| 05000416/LER-1985-024, :on 850627,reactor Manually Scrammed When Condensate Pumps & Booster Pumps Tripped.Caused by Failure of hi-hi Level Switch.Switch Replaced & All Feedwater Heater Switches Calibr |
- on 850627,reactor Manually Scrammed When Condensate Pumps & Booster Pumps Tripped.Caused by Failure of hi-hi Level Switch.Switch Replaced & All Feedwater Heater Switches Calibr
| |
| 05000416/LER-1985-025, :on 850625,during Return to Svc of Reactor Water Cleanup (RWCU) Temp Switch,Fuse Blew Causing Loss of Power to RWCU Containment Isolation Logic Relay.Caused by Jumper Shorting During Removal.Fuse Replaced |
- on 850625,during Return to Svc of Reactor Water Cleanup (RWCU) Temp Switch,Fuse Blew Causing Loss of Power to RWCU Containment Isolation Logic Relay.Caused by Jumper Shorting During Removal.Fuse Replaced
| |
| 05000416/LER-1985-026, :on 850621,flanges Used to Perform Airlock Overall Leakage Barrel Tests Not Local Leak Rate Tested. Caused by Incorrect Conclusions of 1983 Review.Flanges Tested & Added to Surveillance Procedures |
- on 850621,flanges Used to Perform Airlock Overall Leakage Barrel Tests Not Local Leak Rate Tested. Caused by Incorrect Conclusions of 1983 Review.Flanges Tested & Added to Surveillance Procedures
| |
| 05000416/LER-1985-027, :on 850703,circulating Water Pump B Tripped, Causing Turbine Trip & Reactor Scram.Caused by Faulty Rotor Temp Monitoring Circuit.Design Mod Will Be Implemented |
- on 850703,circulating Water Pump B Tripped, Causing Turbine Trip & Reactor Scram.Caused by Faulty Rotor Temp Monitoring Circuit.Design Mod Will Be Implemented
| |
| 05000416/LER-1985-028, :on 850717,diesel Generator Tripped.Plant Shutdown Initiated.Caused by Failed Generator Bearing. Bearing Replaced.Generator Returned to Svc Prior to Required Shutdown |
- on 850717,diesel Generator Tripped.Plant Shutdown Initiated.Caused by Failed Generator Bearing. Bearing Replaced.Generator Returned to Svc Prior to Required Shutdown
| |
| 05000416/LER-1985-029, :on 850724,penetrations CE359G & CE361G Functioning as Fire Barriers Discovered Open.Caused by Failure to Follow Procedures.Fire Watches Established & Maint Work Orders Issued to Seal Penetrations |
- on 850724,penetrations CE359G & CE361G Functioning as Fire Barriers Discovered Open.Caused by Failure to Follow Procedures.Fire Watches Established & Maint Work Orders Issued to Seal Penetrations
| |
| 05000416/LER-1985-030, :on 850807,reactor Automatically Scrammed Due to Main Generator Trip.Caused by Faulty Instrument Plug connector.Off-normal Event Procedure Performed & Plug Connector Repaired |
- on 850807,reactor Automatically Scrammed Due to Main Generator Trip.Caused by Faulty Instrument Plug connector.Off-normal Event Procedure Performed & Plug Connector Repaired
| |
| 05000416/LER-1985-031, :on 850816,cell in Div 1 Battery Bank Found to Be Inoperable Based on 850813 Specific Gravity Measurements. Caused by Personnel Error.Surveillance Procedure Being Revised to Clarify When Battery Inoperable |
- on 850816,cell in Div 1 Battery Bank Found to Be Inoperable Based on 850813 Specific Gravity Measurements. Caused by Personnel Error.Surveillance Procedure Being Revised to Clarify When Battery Inoperable
| |
| 05000416/LER-1985-032, :on 850829,discovered That on 841201 & 04, Liquid Effluent Flow Rate Estimates Exceeded 4 H Frequency of Tech Specs Requirements.Caused by Late Flow Rate Measurements.Procedural Controls Revised |
- on 850829,discovered That on 841201 & 04, Liquid Effluent Flow Rate Estimates Exceeded 4 H Frequency of Tech Specs Requirements.Caused by Late Flow Rate Measurements.Procedural Controls Revised
| |
| 05000416/LER-1985-033, :on 850830,discovered Standby Svc Water Sys Not Under Plant Operational Control.Caused by Piping Not Being Included in Release Package.Programmatic Controls for Addressing Concerns Under Evaluation |
- on 850830,discovered Standby Svc Water Sys Not Under Plant Operational Control.Caused by Piping Not Being Included in Release Package.Programmatic Controls for Addressing Concerns Under Evaluation
| |
| 05000416/LER-1985-034, :on 850819,test Canister in Standby Gas Treatment Filter Train B Found to Contain No Charcoal.On 850906,test Showed Efficiency Below Tech Spec Requirement. Canister Location in Unit Blanked Off |
- on 850819,test Canister in Standby Gas Treatment Filter Train B Found to Contain No Charcoal.On 850906,test Showed Efficiency Below Tech Spec Requirement. Canister Location in Unit Blanked Off
| |
| 05000416/LER-1985-035, :on 850911,four motor-operated Valves & Two Drain Line Check Valves of MSIV Leakage Control Sys Not Tested Per Tech Specs 4.6.1.4.6 & 4.0.5.Caused by Delay in Issuing/Administering Procedure |
- on 850911,four motor-operated Valves & Two Drain Line Check Valves of MSIV Leakage Control Sys Not Tested Per Tech Specs 4.6.1.4.6 & 4.0.5.Caused by Delay in Issuing/Administering Procedure
| |
| 05000416/LER-1985-036, :on 850916,reactor Scram Occurred Due to Turbine Trip on Low Condenser Vacuum.Caused by Pump Trips on Low Lube Water Flow.Water Level Restored.Scram off-normal Event Procedure Initiated |
- on 850916,reactor Scram Occurred Due to Turbine Trip on Low Condenser Vacuum.Caused by Pump Trips on Low Lube Water Flow.Water Level Restored.Scram off-normal Event Procedure Initiated
| |
| 05000416/LER-1985-037, :on 850620,smoke Detector in Control Bldg HVAC Chase Failed to Annunciate on Control Room Console During Routine Testing.Caused by Erroneous Zone Description Entry Onto Data Base.Controls Re Data Mod Underway |
- on 850620,smoke Detector in Control Bldg HVAC Chase Failed to Annunciate on Control Room Console During Routine Testing.Caused by Erroneous Zone Description Entry Onto Data Base.Controls Re Data Mod Underway
| |
| 05000416/LER-1985-038, :on 850925,actuation of Standby Gas Treatment Sys a & Control Room Fresh Air Unit a Occurred Due to Reduced Voltage Output.Caused by Failed Transformer Internal.Failed Solenoid Replaced |
- on 850925,actuation of Standby Gas Treatment Sys a & Control Room Fresh Air Unit a Occurred Due to Reduced Voltage Output.Caused by Failed Transformer Internal.Failed Solenoid Replaced
| |
| 05000416/LER-1985-039, :on 851017,inadvertent Loss of Power to ESF Bus Caused Inoperability of Div 2 Safety Sys.Caused by Personnel Error.Electrical Personnel Instructed on Relationship of Protective Circuit to Feeder Breakers |
- on 851017,inadvertent Loss of Power to ESF Bus Caused Inoperability of Div 2 Safety Sys.Caused by Personnel Error.Electrical Personnel Instructed on Relationship of Protective Circuit to Feeder Breakers
| 10 CFR 50.73(a)(2)(v), Loss of Safety Function 10 CFR 50.73(a)(2)(vii), Common Cause Inoperability 10 CFR 50.73(a)(2)(iv), System Actuation |
| 05000416/LER-1985-040, :on 851021,while Performing Calibr Surveillance of Scram Hydraulic Control Unit Accumulator Low Pressure Alarm switches,158 of 193 Switch Setpoints Found Lower than Tech Spec Limits.Tech Specs Revised |
- on 851021,while Performing Calibr Surveillance of Scram Hydraulic Control Unit Accumulator Low Pressure Alarm switches,158 of 193 Switch Setpoints Found Lower than Tech Spec Limits.Tech Specs Revised
| |
| 05000416/LER-1985-041, :on 851031,operability of Alternate Method of DHR Not Demonstrated within 24 H Period Per Tech Spec 3.4.9.2.Caused by Inadequate Coordination of Time Changes for Required Action.Shift Checksheet Revised |
- on 851031,operability of Alternate Method of DHR Not Demonstrated within 24 H Period Per Tech Spec 3.4.9.2.Caused by Inadequate Coordination of Time Changes for Required Action.Shift Checksheet Revised
| 10 CFR 50.73(a)(2) |
| 05000416/LER-1985-042, :on 851102 & 23,ESF Bus Trips Occurred.Caused by Incorrect Wiring Configuration.Configurations Corrected |
- on 851102 & 23,ESF Bus Trips Occurred.Caused by Incorrect Wiring Configuration.Configurations Corrected
| |
| 05000416/LER-1985-044, :on 851118,control Room Emergency Filtration Subsystem Isolation Occurred Due to High Chlorine Concentration Signal.Cause Undetermined.Sys Returned to Svc on 851125 |
- on 851118,control Room Emergency Filtration Subsystem Isolation Occurred Due to High Chlorine Concentration Signal.Cause Undetermined.Sys Returned to Svc on 851125
| |
| 05000416/LER-1985-045, :on 851205,some Namco Limit Switches Identified as Not Meeting Environ Qualification Requirements of 10CFR50.49.Four Valves Found W/Seven Nonqualified Limit Switches When Qualified Switches Required |
- on 851205,some Namco Limit Switches Identified as Not Meeting Environ Qualification Requirements of 10CFR50.49.Four Valves Found W/Seven Nonqualified Limit Switches When Qualified Switches Required
| |
| 05000416/LER-1985-046, :on 851204,surveillance Procedure Deficiency Found Involving Logic Sys Functional Test of Three RHR Sys Isolation Valves.Caused by Oversight in Incorporating All Aspects of Procedure.Procedure Revised |
- on 851204,surveillance Procedure Deficiency Found Involving Logic Sys Functional Test of Three RHR Sys Isolation Valves.Caused by Oversight in Incorporating All Aspects of Procedure.Procedure Revised
| |
| 05000416/LER-1985-047, :on 851216,Div 1 Control Room Emergency Filtration Subsys Switched to Isolation Mode of Operation Due to High Chlorine Concentration Signal.Cause Not Determined |
- on 851216,Div 1 Control Room Emergency Filtration Subsys Switched to Isolation Mode of Operation Due to High Chlorine Concentration Signal.Cause Not Determined
| |
| 05000416/LER-1985-048, :on 851218,diesel Generator Automatically Started Due to Loss of Power to ESF Bus 17AC.Caused by Cut Down Tree Falling on Primary Transmission Line.Diesel Generator Automatically Started |
- on 851218,diesel Generator Automatically Started Due to Loss of Power to ESF Bus 17AC.Caused by Cut Down Tree Falling on Primary Transmission Line.Diesel Generator Automatically Started
| 10 CFR 50.73(a)(2)(iv), System Actuation |
| 05000416/LER-1985-049, :on 851222,review of 850914 Quarterly Surveillance Revealed That Valve Isolation Time Greater than Tech Spec Limit & Criteria Erroneously Marked Acceptable. Caused by Personnel Error |
- on 851222,review of 850914 Quarterly Surveillance Revealed That Valve Isolation Time Greater than Tech Spec Limit & Criteria Erroneously Marked Acceptable. Caused by Personnel Error
| 10 CFR 50.73(a)(2)(1) |
| 05000416/LER-1985-050, :on 851231,reactor Scrammed from Low Condenser Hotwell Level & HPCS Injection Valve Failing to Open.Caused by Failure of Agastat Relay Base.Reactor Water Level Restored.Relay Base Replaced |
- on 851231,reactor Scrammed from Low Condenser Hotwell Level & HPCS Injection Valve Failing to Open.Caused by Failure of Agastat Relay Base.Reactor Water Level Restored.Relay Base Replaced
| 10 CFR 50.73(a)(2)(iv), System Actuation |