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| 05000265/LER-1998-001-10, :on 971122,TS Surveillance for SRM Was Not Performed within Required Interval for Units 1 & 2 Due to Inadequate Identification of TS Requirement in Surveillance. Surveillance Was Performed for Units 1 & 2 on 980222 |
- on 971122,TS Surveillance for SRM Was Not Performed within Required Interval for Units 1 & 2 Due to Inadequate Identification of TS Requirement in Surveillance. Surveillance Was Performed for Units 1 & 2 on 980222
| 10 CFR 50.73(a)(2)(iv), System Actuation |
| 05000265/LER-1998-001, Forwards LER 98-001-00 Per 10CFR50.73(a)(2)(i)(B).Listed Commitments Made by Ltr | Forwards LER 98-001-00 Per 10CFR50.73(a)(2)(i)(B).Listed Commitments Made by Ltr | 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications |
| 05000254/LER-1998-002, :on 961007,required Drywell HP Instrument Channel Relay Monthly Surviellance Interval Was Exceeded Due to Inadequate Test Procedure.Caused by Cognitive Personnel Error.Personnel Error Reviewed W/Responsible Individuals |
- on 961007,required Drywell HP Instrument Channel Relay Monthly Surviellance Interval Was Exceeded Due to Inadequate Test Procedure.Caused by Cognitive Personnel Error.Personnel Error Reviewed W/Responsible Individuals
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| 05000265/LER-1998-002-07, :on 970609,H Samples Were Not Collected IAW TS Sr.Caused by Misinterpretation of TS Requirements.Revised Procedure & Reviewed Other Comed Stations Implementation of TS to Identify & Resolve Any Discrepancies |
- on 970609,H Samples Were Not Collected IAW TS Sr.Caused by Misinterpretation of TS Requirements.Revised Procedure & Reviewed Other Comed Stations Implementation of TS to Identify & Resolve Any Discrepancies
| 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 10 CFR 50.72(b)(3)(ii), Degraded or Unanalyzed Condition 10 CFR 50.73(a)(2)(viii)(A) |
| 05000265/LER-1998-002, Forwards LER 98-002-00,IAW 10CFR50.73(a)(2)(i)(B). Commitments Made within Ltr,Listed | Forwards LER 98-002-00,IAW 10CFR50.73(a)(2)(i)(B). Commitments Made within Ltr,Listed | 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications |
| 05000265/LER-1998-003-06, :on 980628,main Generator Trip & Subsequent Reactor Scram Occurred Due to Loose Electrical Connection in Current Transformer.Caused by Vibrations.Stabilized Unit 2 by Placing Unit in Hot Shutdown |
- on 980628,main Generator Trip & Subsequent Reactor Scram Occurred Due to Loose Electrical Connection in Current Transformer.Caused by Vibrations.Stabilized Unit 2 by Placing Unit in Hot Shutdown
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| 05000265/LER-1998-003, Forwards LER 98-003-00,submitted IAW 10CFR50.73(a)(2)(iv). Commitments Made within Ltr Listed | Forwards LER 98-003-00,submitted IAW 10CFR50.73(a)(2)(iv). Commitments Made within Ltr Listed | 10 CFR 50.73(a)(2)(iv), System Actuation |
| 05000254/LER-1998-003, :on 971210,TS LCO Was Exceeded When SBGT Subsystem Was Inoperable Because EDGs Was Inoperable.Caused by Inadequate Procedure Development & Review.Correctly Positioned Valve & Revised Procedure |
- on 971210,TS LCO Was Exceeded When SBGT Subsystem Was Inoperable Because EDGs Was Inoperable.Caused by Inadequate Procedure Development & Review.Correctly Positioned Valve & Revised Procedure
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| 05000254/LER-1998-004, :on 980113,RHR Shutdown Cooling Common Suction Header Was Made Inoperable Due to TS Lco.Caused by Operations & Engineering Knowledge Deficiencies & Inadequate Procedure.Defective Snubber Replaced |
- on 980113,RHR Shutdown Cooling Common Suction Header Was Made Inoperable Due to TS Lco.Caused by Operations & Engineering Knowledge Deficiencies & Inadequate Procedure.Defective Snubber Replaced
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| 05000265/LER-1998-005, Forwards LER 98-005-00,per 10CFR50.73(a)(2)(vii)B. Commitments Made by Util,Listed | Forwards LER 98-005-00,per 10CFR50.73(a)(2)(vii)B. Commitments Made by Util,Listed | 10 CFR 50.73(a)(2)(vii), Common Cause Inoperability |
| 05000265/LER-1998-005-07, :on 980729,HPCI Subsystem Turning Gear Failed to Engage Automatically Rendering HPCI Subsystem Inoperable. Caused by Failed Limit Switch in Tgr Logic.Limit Switch & Pressure Switch Were Replaced |
- on 980729,HPCI Subsystem Turning Gear Failed to Engage Automatically Rendering HPCI Subsystem Inoperable. Caused by Failed Limit Switch in Tgr Logic.Limit Switch & Pressure Switch Were Replaced
| 10 CFR 50.73(a)(2) |
| 05000254/LER-1998-005, :on 980206,failure to Complete Visual Periodic Insp for Rc Sources Outside Primary Containment Was Noted. Caused by Ineffective Scheduling & Tracking of Sys Insp. Assigned Owner to Oversee Leak Reduction Program |
- on 980206,failure to Complete Visual Periodic Insp for Rc Sources Outside Primary Containment Was Noted. Caused by Ineffective Scheduling & Tracking of Sys Insp. Assigned Owner to Oversee Leak Reduction Program
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| 05000265/LER-1998-006, Forwards LER 98-006-00,IAW 10CFR50.73(a)(2)(v)(B). Commitments Made by Util Are Listed | Forwards LER 98-006-00,IAW 10CFR50.73(a)(2)(v)(B). Commitments Made by Util Are Listed | 10 CFR 50.73(a)(2)(v)(B), Loss of Safety Function - Remove Residual Heat |
| 05000254/LER-1998-006, :on 980128,RB Post LOCA Temps Were Higher than Values Used for Environ Qualification of Electrical Equipment Due to Invalid Engineering Judgement.Cause Cannot Be Objectively Documented.Installed New TOLs |
- on 980128,RB Post LOCA Temps Were Higher than Values Used for Environ Qualification of Electrical Equipment Due to Invalid Engineering Judgement.Cause Cannot Be Objectively Documented.Installed New TOLs
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| 05000254/LER-1998-006-01, Forwards LER 98-006-01,re RB Post LOCA Temps.Actions Listed Are Required for Closure of Issue But Are Not Required Prior to Startup | Forwards LER 98-006-01,re RB Post LOCA Temps.Actions Listed Are Required for Closure of Issue But Are Not Required Prior to Startup | |
| 05000265/LER-1998-006-04, :on 980918,Unit 2 Entered 12 H LCO to Hot Shutdown,Due to HPCI & RCIC Being Declared Inoperable.Caused by Inadequate Procedure Rev.Revised Procedure Qcis 0200-06 |
- on 980918,Unit 2 Entered 12 H LCO to Hot Shutdown,Due to HPCI & RCIC Being Declared Inoperable.Caused by Inadequate Procedure Rev.Revised Procedure Qcis 0200-06
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| 05000254/LER-1998-007, :on 980115,design Basis of RB Superstructure Was Not in Literal Conformance W/Ufsar.Caused by Original FSAR Lacking Sufficient Detail Class I Loading Combinations. Operations Placed RB Overhead Crane OOS in Parked Position |
- on 980115,design Basis of RB Superstructure Was Not in Literal Conformance W/Ufsar.Caused by Original FSAR Lacking Sufficient Detail Class I Loading Combinations. Operations Placed RB Overhead Crane OOS in Parked Position
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| 05000254/LER-1998-009, :on 980210,temp Switches Used to Perform Daily Verification Were Set Below Value Needed to Support Ts. Caused by Failure to Establish During Implementation of TS Program.Revised Procedures to Take Reading Once Per 24 H |
- on 980210,temp Switches Used to Perform Daily Verification Were Set Below Value Needed to Support Ts. Caused by Failure to Establish During Implementation of TS Program.Revised Procedures to Take Reading Once Per 24 H
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| 05000254/LER-1998-010, :on 980213,TS Surveillance Interval for Snubber Visual Insp Was Exceeded.Caused by Personnel Error.Completed TS Insps & Engineering Evaluations,Verification of Correct Insp Interval Dates & Personal Accountability Actions |
- on 980213,TS Surveillance Interval for Snubber Visual Insp Was Exceeded.Caused by Personnel Error.Completed TS Insps & Engineering Evaluations,Verification of Correct Insp Interval Dates & Personal Accountability Actions
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| 05000254/LER-1998-011, Forwards LER 98-011-00,IAW 10CFR50.73(a)(2)(i)(B). Commitments Made within Ltr,Listed | Forwards LER 98-011-00,IAW 10CFR50.73(a)(2)(i)(B). Commitments Made within Ltr,Listed | 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications |
| 05000254/LER-1998-011-02, :on 980716,unqualified Circuit Card Was Installed in SD Instrument Vol Level Transmitter,Rendering It Inoperable.Caused by Personnel Error.Reviewed Event with Instrument Maint,Sys Engineering & Procurement Engineering |
- on 980716,unqualified Circuit Card Was Installed in SD Instrument Vol Level Transmitter,Rendering It Inoperable.Caused by Personnel Error.Reviewed Event with Instrument Maint,Sys Engineering & Procurement Engineering
| 10 CFR 50.73(a)(2)(v), Loss of Safety Function 10 CFR 50.73(a)(2)(i) 10 CFR 50.72(b)(3)(ii), Degraded or Unanalyzed Condition |
| 05000254/LER-1998-012-01, :on 980227,reactor Bottom Head Drain Line Developed Leak.Caused by Inadequate Work Practice During Original Construction.Replaced Leaking Section of Drain Line Under Design Change Package(Dcp 9800100) |
- on 980227,reactor Bottom Head Drain Line Developed Leak.Caused by Inadequate Work Practice During Original Construction.Replaced Leaking Section of Drain Line Under Design Change Package(Dcp 9800100)
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| 05000254/LER-1998-013, :on 980131,discovered Insufficient Clearance Between Core Spray Test Return Valve & Pressure Suppression Chamber.Caused by Inattention to Detail in Original Design. Removed Pad to Restore Adequate Clearance |
- on 980131,discovered Insufficient Clearance Between Core Spray Test Return Valve & Pressure Suppression Chamber.Caused by Inattention to Detail in Original Design. Removed Pad to Restore Adequate Clearance
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| 05000254/LER-1998-014, :on 980306,required ASME Section XI Code Examination for Feedwater Nozzles Were Not Conducted During Second Ten Year Interval.Caused by Weakness in Processes Existing at Time for Completion.Searches Were Completed |
- on 980306,required ASME Section XI Code Examination for Feedwater Nozzles Were Not Conducted During Second Ten Year Interval.Caused by Weakness in Processes Existing at Time for Completion.Searches Were Completed
| 10 CFR 50.73(a)(2)(v), Loss of Safety Function 10 CFR 50.73(a)(2)(iv), System Actuation 10 CFR 50.73(a)(2)(i) |
| 05000254/LER-1998-015, :on 980326,declared CREVS Inoperable.Caused by Excessive Wear to Valve Internals,Which Was Not Detected Prior to Event Due to Lack of Preventative Maint for Valve. Valve Repaired |
- on 980326,declared CREVS Inoperable.Caused by Excessive Wear to Valve Internals,Which Was Not Detected Prior to Event Due to Lack of Preventative Maint for Valve. Valve Repaired
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| 05000254/LER-1998-016, :on 980411,determined That TS Scram Discharge Volume Instruments Exceeded Setpoint.Caused by Insufficient Setpoint Margin.Revised Setpoints & Implemented Addl Margin to Account for Drift |
- on 980411,determined That TS Scram Discharge Volume Instruments Exceeded Setpoint.Caused by Insufficient Setpoint Margin.Revised Setpoints & Implemented Addl Margin to Account for Drift
| 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications |
| 05000254/LER-1998-017, :on 980626,CR Emergency Air Conditioning Compressor Tripped on Loss of Cooling Water During Monthly Surveillance.Caused by Miscommunication Between Operators. Affected Equipment Attendant Counseled on Event |
- on 980626,CR Emergency Air Conditioning Compressor Tripped on Loss of Cooling Water During Monthly Surveillance.Caused by Miscommunication Between Operators. Affected Equipment Attendant Counseled on Event
| 10 CFR 50.73(a)(2)(vii), Common Cause Inoperability 10 CFR 50.73(a)(2)(i) 10 CFR 50.73(a)(2) |
| 05000254/LER-1998-018, :on 980627,full Reactor Scram Occurred While Performing TS Required Weekly APRM Surveillance.Caused by Spurious Trip from RPS Channel B Scram Discharge Instrument Volume Level Instrumentation.Replaced Level Transmitter |
- on 980627,full Reactor Scram Occurred While Performing TS Required Weekly APRM Surveillance.Caused by Spurious Trip from RPS Channel B Scram Discharge Instrument Volume Level Instrumentation.Replaced Level Transmitter
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| 05000254/LER-1998-019, :on 980917,high RP Permissive Switch to RHR Shutdown Cooling Sys Would Not Close & Would Not Calibrate. Caused by Switch Aging.Failed Switch Was Electrically Disarmed Per TS 3.2.A,Action 2 |
- on 980917,high RP Permissive Switch to RHR Shutdown Cooling Sys Would Not Close & Would Not Calibrate. Caused by Switch Aging.Failed Switch Was Electrically Disarmed Per TS 3.2.A,Action 2
| 10 CFR 50.73(a)(2)(vii), Common Cause Inoperability 10 CFR 50.73(a)(2)(iv), System Actuation 10 CFR 50.73(a)(2)(i) 10 CFR 50.73(a)(2)(iii) |
| 05000254/LER-1998-020, :on 980813,HPCIS Was Inoperable Due to HP Pump Thrust Bearing Oil Leak.Caused by Improper Setting of Thrust Bearing.Reviewed Maint & Training Procedure to Determine If Changes Are Needed |
- on 980813,HPCIS Was Inoperable Due to HP Pump Thrust Bearing Oil Leak.Caused by Improper Setting of Thrust Bearing.Reviewed Maint & Training Procedure to Determine If Changes Are Needed
| 10 CFR 50.73(a)(2)(v), Loss of Safety Function |
| 05000254/LER-1998-021, :on 980918,weekly Position Verification of RB to Suppression Chamber Cv Vacuum Breakers Was Misinterpreted & Not Perfromed.Caused by Inadequate Development of Specification.Implemented Procedure Changes |
- on 980918,weekly Position Verification of RB to Suppression Chamber Cv Vacuum Breakers Was Misinterpreted & Not Perfromed.Caused by Inadequate Development of Specification.Implemented Procedure Changes
| 10 CFR 50.73(a)(2) |
| 05000254/LER-1998-022, :on 980930,reactor Low Water Level Scram Occurred When Equipment OOS Disabled FW Level Control.Caused by Inadequate Review of Controlled Drawings.Heightened Risk Assessment for OOS Activities |
- on 980930,reactor Low Water Level Scram Occurred When Equipment OOS Disabled FW Level Control.Caused by Inadequate Review of Controlled Drawings.Heightened Risk Assessment for OOS Activities
| 10 CFR 50.72(b)(3)(ii), Degraded or Unanalyzed Condition |
| 05000254/LER-1998-023, :on 981008,discovered That Air Filtration Unit (Afu) Airflow & Afu Differential Pressure Exceeded TS Limits.Caused by Inaccuracy of CREVS Afu Airflow Instrument. Licensee Adjusted Afu Airflow Rate to Meet TS Requirements |
- on 981008,discovered That Air Filtration Unit (Afu) Airflow & Afu Differential Pressure Exceeded TS Limits.Caused by Inaccuracy of CREVS Afu Airflow Instrument. Licensee Adjusted Afu Airflow Rate to Meet TS Requirements
| 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 10 CFR 50.73(a)(2)(i) 10 CFR 50.73(a)(2)(x) 10 CFR 50.73(a)(2)(iii) 10 CFR 50.72(b)(3)(ii), Degraded or Unanalyzed Condition 10 CFR 50.73(a)(2)(viii)(A) |
| 05000254/LER-1998-024, :on 981022,noted That TS LCO Was Not Met When PCIV Was Made Inoperable by Maint.Caused by Improper Authorization to Start Work.Operations Completed Required Testing for 1-1601-21 PCIV on 981022 |
- on 981022,noted That TS LCO Was Not Met When PCIV Was Made Inoperable by Maint.Caused by Improper Authorization to Start Work.Operations Completed Required Testing for 1-1601-21 PCIV on 981022
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| 05000254/LER-1998-025, :on 981102,HPCIS Pci Check Valve Failed.Caused by Corrosion in Valve Body.Revised Check Valve Insp Procedures to Add Corrosion Repair Criteria |
- on 981102,HPCIS Pci Check Valve Failed.Caused by Corrosion in Valve Body.Revised Check Valve Insp Procedures to Add Corrosion Repair Criteria
| 10 CFR 50.73(a)(2)(vii), Common Cause Inoperability 10 CFR 50.73(a)(2)(iv), System Actuation |