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| Issue date | Title | Topic | |
|---|---|---|---|
| U-603232, Special Rept:On 990531 Lpms Was Declared Inoperable Due to Receipt of High Vibration & Loose Parts Alarm Which Did Not Clear.Lpms Was Restored to Operable Status on 990707 After Alignment & Tension on Recorder Tape Drive Was Adjusted | 9 July 1999 | Special Rept:On 990531 Lpms Was Declared Inoperable Due to Receipt of High Vibration & Loose Parts Alarm Which Did Not Clear.Lpms Was Restored to Operable Status on 990707 After Alignment & Tension on Recorder Tape Drive Was Adjusted | |
| U-603101, Special Rept:On 980918,discovered That Triaxial Seismic Accelerometers Had Not Been Properly Calibrated.Caused by Inadequate Calibration Procedure.Calibration to Be Performed off-site | 28 October 1998 | Special Rept:On 980918,discovered That Triaxial Seismic Accelerometers Had Not Been Properly Calibrated.Caused by Inadequate Calibration Procedure.Calibration to Be Performed off-site | Offsite Dose Calculation Manual Safe Shutdown Earthquake Operating Basis Earthquake |
| U-603014, Special Rept:On 980512,lightning Struck Primary Meteorological Monitoring Instrumentation Tower Damaging 60- Meter Wind Speed & Associated Transmuter Circuit Card. Surveillance Testing Performed | 28 May 1998 | Special Rept:On 980512,lightning Struck Primary Meteorological Monitoring Instrumentation Tower Damaging 60- Meter Wind Speed & Associated Transmuter Circuit Card. Surveillance Testing Performed | |
| U-602940, Ro:On 980213,alert Emergency Classification Was Declared IAW EPIP EC-02, Emergency Classifications. Caused by Tripped Inverter.Rhr a Was Restored at Approx 0945 H & Emergency Terminated at 1004 H Per EPIP EC-04, Alert | 20 February 1998 | Ro:On 980213,alert Emergency Classification Was Declared IAW EPIP EC-02, Emergency Classifications. Caused by Tripped Inverter.Rhr a Was Restored at Approx 0945 H & Emergency Terminated at 1004 H Per EPIP EC-04, Alert | |
| U-602921, Special Rept:On 980113,operations Personnel Declared Meteorological Tower Wind Direction Instrumentation Inoperable.Consistent Difference Suspected to Have Been Caused by Rotation of Either or Both of Wind Sensor | 29 January 1998 | Special Rept:On 980113,operations Personnel Declared Meteorological Tower Wind Direction Instrumentation Inoperable.Consistent Difference Suspected to Have Been Caused by Rotation of Either or Both of Wind Sensor | High winds |
| U-602599, Special Rept:On 960516,Loose Parts Monitoring System Declared Inoperable.Caused by Intermittent Alarms.Removed Temporary Mod & Restored Alarm Feature for Channel Three | 21 June 1996 | Special Rept:On 960516,Loose Parts Monitoring System Declared Inoperable.Caused by Intermittent Alarms.Removed Temporary Mod & Restored Alarm Feature for Channel Three | Temporary Modification |
| U-602534, Special Rept:On 951206,determined Facility May Have Been Operated Above Max Power Level Authorized by License Due to Error in Reactor Heat Balance.Util Will Bias CRD Sys Flow Process Computer Point | 3 January 1996 | Special Rept:On 951206,determined Facility May Have Been Operated Above Max Power Level Authorized by License Due to Error in Reactor Heat Balance.Util Will Bias CRD Sys Flow Process Computer Point | Fuel cladding |
| U-602527, Special Rept:On 951103,reactor Water Cleanup Sys Flow Rate Computer Valve Substituted W/Value of Zero & Sys Actually Operating.Caused by Lack of Attention.Shift Technical Advisor Immediately Restored Computer | 5 December 1995 | Special Rept:On 951103,reactor Water Cleanup Sys Flow Rate Computer Valve Substituted W/Value of Zero & Sys Actually Operating.Caused by Lack of Attention.Shift Technical Advisor Immediately Restored Computer | |
| U-602426, Ro:On 950301,plant Was Operating at Approx 75% Fire Was Reported in a turbine-driven Reactor Feed Pump Room | 3 March 1995 | Ro:On 950301,plant Was Operating at Approx 75% Fire Was Reported in a turbine-driven Reactor Feed Pump Room | |
| U-602421, Ro:On 950216,Div 2 125 Volt Dc Electrical Power Sys Declared Inoperable.Caused by Failure of Silicon Controlled Rectifier Firing Board in Div 2 Battery Charger.Battery Charger Repaired | 22 February 1995 | Ro:On 950216,Div 2 125 Volt Dc Electrical Power Sys Declared Inoperable.Caused by Failure of Silicon Controlled Rectifier Firing Board in Div 2 Battery Charger.Battery Charger Repaired | Enforcement Discretion |
| U-602348, Special Rept:On 940906,CPS Declared Loose Parts Monitoring Sys Out of Svc.Caused by False Alarms.Util Will Recalibrate Channel Six | 10 October 1994 | Special Rept:On 940906,CPS Declared Loose Parts Monitoring Sys Out of Svc.Caused by False Alarms.Util Will Recalibrate Channel Six | Temporary Modification |
| U-602311, Special Rept:On 940624,inoperabilities of Meteorological Monitoring Instrumentation Channels for More than 7 Days Identified.Personnel Worked Expeditiously to Return Meteorological Instrumentation to Operable Status | 12 July 1994 | Special Rept:On 940624,inoperabilities of Meteorological Monitoring Instrumentation Channels for More than 7 Days Identified.Personnel Worked Expeditiously to Return Meteorological Instrumentation to Operable Status | |
| U-602308, Special Rept:On 940607,determined Valid Failure of Div 1 EDG Had Occurred Due to Excessive Current.Replaced Failed Relay | 7 July 1994 | Special Rept:On 940607,determined Valid Failure of Div 1 EDG Had Occurred Due to Excessive Current.Replaced Failed Relay | Safe Shutdown High winds Offsite Circuit |
| U-602193, Special Rept:On 930927,valid Failure of Div II DG Occurred During Surveillance Testing.Caused by Insufficient Contact Pressure Between Contacting Surfaces.Contact Pressure Checks to Improve Component Reliability Implemented | 12 October 1993 | Special Rept:On 930927,valid Failure of Div II DG Occurred During Surveillance Testing.Caused by Insufficient Contact Pressure Between Contacting Surfaces.Contact Pressure Checks to Improve Component Reliability Implemented | |
| U-602189, Follow-up Special Rept on Progress of Investigation Into Diesel I DG Test Failures That Occurred on 930623,0721 & 0803.Current Number of Valid Failures in Last 100 Valid Tests of DG1A Is Seven.Testing for DG1A Conducted | 24 September 1993 | Follow-up Special Rept on Progress of Investigation Into Diesel I DG Test Failures That Occurred on 930623,0721 & 0803.Current Number of Valid Failures in Last 100 Valid Tests of DG1A Is Seven.Testing for DG1A Conducted | Safe Shutdown High winds Offsite Circuit |
| U-602181, Special Rept:On 930812-30,differential Air Temp Instrumentation Inoperable.Caused by Problem W/Power Supply Panel 0EM01J.Replacement Power Supply Unavailable. Engineering Change Request ECN 28103 Processed | 30 August 1993 | Special Rept:On 930812-30,differential Air Temp Instrumentation Inoperable.Caused by Problem W/Power Supply Panel 0EM01J.Replacement Power Supply Unavailable. Engineering Change Request ECN 28103 Processed | |
| U-602174, Special Rept:On 930721 & 0803,valid Test Failures of Div I DG Occurred Due to Problem W/Contacts within Breaker Control Switch & Failed Coil in B-C Phase Undervoltage Relay, Respectively.Subj Parts Will Be Replaced During DG Outage | 20 August 1993 | Special Rept:On 930721 & 0803,valid Test Failures of Div I DG Occurred Due to Problem W/Contacts within Breaker Control Switch & Failed Coil in B-C Phase Undervoltage Relay, Respectively.Subj Parts Will Be Replaced During DG Outage | |
| U-602163, Special Rept:On 930623,Div I DG (DG1A) Failed to Synchronize W/Associated Safety Bus & Generator Output Breaker Tripped on Reverse Power Signal Due to Faulty Reverse Power Relay. DG1A Reverse Power Relay Replaced W/Newer Model | 23 July 1993 | Special Rept:On 930623,Div I DG (DG1A) Failed to Synchronize W/Associated Safety Bus & Generator Output Breaker Tripped on Reverse Power Signal Due to Faulty Reverse Power Relay. DG1A Reverse Power Relay Replaced W/Newer Model | Commercial Grade Dedication |
| U-602068, Ro:On 921107,ORIX-PR008 Was Declared Inoperable Due to Lo Fail Signal Received for Channel 3 Which Was Unable to Be Reset.Preplanned Alternate Method of Monitoring HVAC Stack Initiated | 24 November 1992 | Ro:On 921107,ORIX-PR008 Was Declared Inoperable Due to Lo Fail Signal Received for Channel 3 Which Was Unable to Be Reset.Preplanned Alternate Method of Monitoring HVAC Stack Initiated | |
| U-602057, Special Rept:On 920921,generator Output Breaker Failed to Close on Four Attempts.Caused by Bent Protective Cover Over Auxiliary Switches & anti-pump Coil.Output Breaker Racked to Test Position & Sucessfully Cycled Three Times | 20 October 1992 | Special Rept:On 920921,generator Output Breaker Failed to Close on Four Attempts.Caused by Bent Protective Cover Over Auxiliary Switches & anti-pump Coil.Output Breaker Racked to Test Position & Sucessfully Cycled Three Times | |
| U-602049, Ro:On 920922,Control Room Received Notification That Employee Working in Radwaste Sort Tent Had Been Injured & Potentially Contaminated.Ambulance Called to Respond.Hosp Notified Util That Victim Was Not Contaminated | 28 September 1992 | Ro:On 920922,Control Room Received Notification That Employee Working in Radwaste Sort Tent Had Been Injured & Potentially Contaminated.Ambulance Called to Respond.Hosp Notified Util That Victim Was Not Contaminated | |
| U-602035, Special Rept:On 920717 & 0807,output Breaker Failed to Close During Periodic Testing of Dg.Caused by Failure of H1 trunk-operated Contact Switch Due to Slight Breaker Movement.Vendor Manual for Switchgear Will Be Reviewed | 19 August 1992 | Special Rept:On 920717 & 0807,output Breaker Failed to Close During Periodic Testing of Dg.Caused by Failure of H1 trunk-operated Contact Switch Due to Slight Breaker Movement.Vendor Manual for Switchgear Will Be Reviewed | Safe Shutdown |
| ML20216J286 | 8 August 1992 | Special Rept:On 920712,determined That Valid Failure of Div 1 EDG Occurred.Caused by B-C Phase CV-2 Relay Telephone Coil Failing Due to Excessive Current.Design Change Mod Initiated.Also Reportable Per Part 21 | Safe Shutdown High winds Enforcement Discretion Offsite Circuit |
| U-601991, Ro:On 920522,discovered That External Vessel Surface Was Hot & Chart Recorder Indicated Absorber Bed Temp Greater than 300F.Fire Brigade Was Activated.Sampling Process Established to Monitor Purge Exhaust Composition | 1 June 1992 | Ro:On 920522,discovered That External Vessel Surface Was Hot & Chart Recorder Indicated Absorber Bed Temp Greater than 300F.Fire Brigade Was Activated.Sampling Process Established to Monitor Purge Exhaust Composition | |
| U-601970, Special Rept:On 920328,diesel Generator 1B Manually Started But Stabilized Outside TS Range of 60 + or - Hz. Caused by Failure of Power Supply for Electronic Speed Controller.Power Supply Replaced | 24 April 1992 | Special Rept:On 920328,diesel Generator 1B Manually Started But Stabilized Outside TS Range of 60 + or - Hz. Caused by Failure of Power Supply for Electronic Speed Controller.Power Supply Replaced | |
| U-601946, Special Rept:On 920302,meteorological Tower Differential Air Temp Instrumentation Declared Inoperable to Facilitate Troubleshooting Re Discrepancy in Meteorological Data. Missing Ducting Tube from Aspirator Installed | 6 March 1992 | Special Rept:On 920302,meteorological Tower Differential Air Temp Instrumentation Declared Inoperable to Facilitate Troubleshooting Re Discrepancy in Meteorological Data. Missing Ducting Tube from Aspirator Installed | |
| U-601942, Revised Special Rept Re non-valid Test Failure of Div I DG, Describing Correct Steps Involved in Synchronizing DG W/ Offsite Power.Dg Output Voltage Adjusted Such That It Is Slightly Higher than Offsite Power Voltage | 2 March 1992 | Revised Special Rept Re non-valid Test Failure of Div I DG, Describing Correct Steps Involved in Synchronizing DG W/ Offsite Power.Dg Output Voltage Adjusted Such That It Is Slightly Higher than Offsite Power Voltage | |
| U-601931, Special Rept:On 920109,diesel Generator 1A Tripped Due to Reverse Power.Caused by Improper Manual Loading Following Synchronization W/Offsite Power.Dg 1A Manually Started to Demonstrate Operability Per Surveillance Procedure 9080.01 | 5 February 1992 | Special Rept:On 920109,diesel Generator 1A Tripped Due to Reverse Power.Caused by Improper Manual Loading Following Synchronization W/Offsite Power.Dg 1A Manually Started to Demonstrate Operability Per Surveillance Procedure 9080.01 | |
| U-601893, Special Rept:On 911001,ORIX-PRO12 Declared Inoperable in Order to Perform Channel Calibr in Accordance W/Ts Surveillance Requirement 4.3.7.5.Calibr Initially Performed by day-shift C&I Crew,Then Backshift Crew | 17 October 1991 | Special Rept:On 911001,ORIX-PRO12 Declared Inoperable in Order to Perform Channel Calibr in Accordance W/Ts Surveillance Requirement 4.3.7.5.Calibr Initially Performed by day-shift C&I Crew,Then Backshift Crew | |
| U-601834, Special Rept:On 910404,during Surveillance Diesel Generator 1A Reached Required Voltage & Frequency But Failed to Close & Phase Undervoltage Relay B-C Tripped.Cause Not Determined.Racking Mechanism Will Be Inspected & Lubricated | 6 May 1991 | Special Rept:On 910404,during Surveillance Diesel Generator 1A Reached Required Voltage & Frequency But Failed to Close & Phase Undervoltage Relay B-C Tripped.Cause Not Determined.Racking Mechanism Will Be Inspected & Lubricated | |
| U-601788, Special Rept:On 910106,Div II Diesel Generator Failed During Test.Caused by Malfunction of A-3 Relay Tachometer. Preventive Maint Task Will Be Issued to Remove,Inspect & Bench Test A-3 Relay Every Two Yrs | 5 February 1991 | Special Rept:On 910106,Div II Diesel Generator Failed During Test.Caused by Malfunction of A-3 Relay Tachometer. Preventive Maint Task Will Be Issued to Remove,Inspect & Bench Test A-3 Relay Every Two Yrs | |
| U-601309, Ro:On 881111,generator Trip W/Reactor Scram Occurred Due to Sudden Pressure Actuation on 1C Main Power Transformer & Fire on Insulator of 1C Main Power Transformer Discovered. Fire Extinguished | 12 November 1988 | Ro:On 881111,generator Trip W/Reactor Scram Occurred Due to Sudden Pressure Actuation on 1C Main Power Transformer & Fire on Insulator of 1C Main Power Transformer Discovered. Fire Extinguished | |
| U-601298, Ro:On 881026,Tech Spec 3.0.3 Entered Due to Declaring Control Room Ventilation Train a Inoperable.Caused by Faulty Flow Transmitter.Reactor Power Was Reduced & Calibr on Train a Flow Transmitter Performed | 27 October 1988 | Ro:On 881026,Tech Spec 3.0.3 Entered Due to Declaring Control Room Ventilation Train a Inoperable.Caused by Faulty Flow Transmitter.Reactor Power Was Reduced & Calibr on Train a Flow Transmitter Performed | |
| U-601265, Ro:On 880901,HPCS Initiated & Injected Water Into Reactor for 28 During Maint Surveillance Activities on Reactor Water Level Transmitter.Injection Valve & HPCS Pump Secured. Notification of Unusual Event Lasted Approx 10 Minutes | 2 September 1988 | Ro:On 880901,HPCS Initiated & Injected Water Into Reactor for 28 During Maint Surveillance Activities on Reactor Water Level Transmitter.Injection Valve & HPCS Pump Secured. Notification of Unusual Event Lasted Approx 10 Minutes | |
| U-601258, Special Rept:On 880803,accident Monitoring Instrumentation for HVAC Stack Declared Inoperable for More That 72 H.Caused by Underway Work to Perform Routine Channel Calibr.Plant Condition Rept Initiated | 22 August 1988 | Special Rept:On 880803,accident Monitoring Instrumentation for HVAC Stack Declared Inoperable for More That 72 H.Caused by Underway Work to Perform Routine Channel Calibr.Plant Condition Rept Initiated | |
| U-601219, Ro:On 880623,maint Technician Badly Burned in 762-ft Radwaste Evaporator Vapor Body Room.Caused by Performing Work on Wrong Evaporator.Evaporator Secured & Technician Given Medical Attention | 24 June 1988 | Ro:On 880623,maint Technician Badly Burned in 762-ft Radwaste Evaporator Vapor Body Room.Caused by Performing Work on Wrong Evaporator.Evaporator Secured & Technician Given Medical Attention | |
| U-601173, Special Rept:On 880329,discovered Failure of Wind Velocity & Direction Sensors on Facility Meteorological Tower.Caused by Inadvertent Exposure of Sensors to Weather.Sensor Assembly, Including Retaining Device Replaced | 15 April 1988 | Special Rept:On 880329,discovered Failure of Wind Velocity & Direction Sensors on Facility Meteorological Tower.Caused by Inadvertent Exposure of Sensors to Weather.Sensor Assembly, Including Retaining Device Replaced | High winds |
| U-601026, Summary Rept:On 870828,notification of Unusual Event Declared Per Emergency Plan Implementing Procedures EC-02. Personnel Informed of Bomb Threat Made Against Util.Security Levels Tightened & Searches Performed.No Explosives Found | 31 August 1987 | Summary Rept:On 870828,notification of Unusual Event Declared Per Emergency Plan Implementing Procedures EC-02. Personnel Informed of Bomb Threat Made Against Util.Security Levels Tightened & Searches Performed.No Explosives Found | |
| U-601015, Ro:On 870816,protected Area Intrusion Detection Sys Deactivated Due to Severe Weather.Compensatory Measures in Place.Security Personnel Removed from Post booths.Closed- Circuit Television Observers Posted Until Weather Cleared | 21 August 1987 | Ro:On 870816,protected Area Intrusion Detection Sys Deactivated Due to Severe Weather.Compensatory Measures in Place.Security Personnel Removed from Post booths.Closed- Circuit Television Observers Posted Until Weather Cleared | |
| U-601017, Ro:On 870819,bomb Threat Received.Security Levels Tightened. State of Il,Nrc Incident Response Ctr & NRC Resident Inspector Notified.No Explosives Located | 20 August 1987 | Ro:On 870819,bomb Threat Received.Security Levels Tightened. State of Il,Nrc Incident Response Ctr & NRC Resident Inspector Notified.No Explosives Located | Stolen |
| U-601004, Ro:On 870804,notification of Unusual Event Declared Due to Inoperability of Channel 1B21-N697A,LPCS,LPCI & RHR B. Functional Test of Channel Performed & Device,Lpcs & LPCI Declared Operable.Notification of Unusual Event Terminated | 5 August 1987 | Ro:On 870804,notification of Unusual Event Declared Due to Inoperability of Channel 1B21-N697A,LPCS,LPCI & RHR B. Functional Test of Channel Performed & Device,Lpcs & LPCI Declared Operable.Notification of Unusual Event Terminated | |
| ML20236B588 | 17 July 1987 | Special Rept:On 870610,loose Parts Monitoring Sys Channels Went Into Alarm & Could Not Be Reset.Caused by Flow Noise from Reactor Recirculation Sys Flow Control Valve in Throttled Position.Alarm Temporarily Disabled | Temporary Modification |
| U-600977, Ro:On 870704,protected Area Intrusion Detection Sys Deactivated Due to Severe Weather.Compensatory Measures Not Taken Due to Personnel Safety.Util Will Review Area of Formal Communications & Take Corrective Actions | 11 July 1987 | Ro:On 870704,protected Area Intrusion Detection Sys Deactivated Due to Severe Weather.Compensatory Measures Not Taken Due to Personnel Safety.Util Will Review Area of Formal Communications & Take Corrective Actions | |
| U-600970, Special Rept:On 870608,plant Failed to Reach Rated Voltage & Rated Speed in Equal to or Less than 12 S.Caused by Linkage Connecting Shaft to Fuel Rack Out of Alignment.Alignment Requirements & Linkage Reworked | 8 July 1987 | Special Rept:On 870608,plant Failed to Reach Rated Voltage & Rated Speed in Equal to or Less than 12 S.Caused by Linkage Connecting Shaft to Fuel Rack Out of Alignment.Alignment Requirements & Linkage Reworked | |
| U-600964, Special Rept:On 870610,earthquake Estimated to Be 5.0 on Richter Scale Noted.Walkdowns of Plant Structures & Sys Conducted.No Damage or Abnormal Conditions Observed.Related Info,Including Sargent & Lundy ...Seismic...Rept, Encl | 19 June 1987 | Special Rept:On 870610,earthquake Estimated to Be 5.0 on Richter Scale Noted.Walkdowns of Plant Structures & Sys Conducted.No Damage or Abnormal Conditions Observed.Related Info,Including Sargent & Lundy ...Seismic...Rept, Encl | Earthquake |
| U-600956, Final Status of Repair & Anticipated Schedule for Restoration of Remaining Out of Svc Annunciators.One Annunciator Listed in Groups 1 & 2 of Util Remain to Be Repaired | 11 June 1987 | Final Status of Repair & Anticipated Schedule for Restoration of Remaining Out of Svc Annunciators.One Annunciator Listed in Groups 1 & 2 of Util Remain to Be Repaired | |
| U-600947, Notification of Unusual Event:On 870524,motor-driven Feed Pump Regulating Valve 1FW-F004 Malfunctioned,Increasing Reactor Water Level.Cause Under Investigation.Valve Shifted to Manual Control W/No Response.Event Terminated Same Day | 26 May 1987 | Notification of Unusual Event:On 870524,motor-driven Feed Pump Regulating Valve 1FW-F004 Malfunctioned,Increasing Reactor Water Level.Cause Under Investigation.Valve Shifted to Manual Control W/No Response.Event Terminated Same Day | |
| U-600941, Special Rept:On 870411,operator Discovered No Power to Play Back Pens (All Lights Out) of Playback Unit.Caused by Blown Fuses of Recorder,Playback & Analyzer.Sensor & Portion of Circuit Boards Have Been Replaced | 21 May 1987 | Special Rept:On 870411,operator Discovered No Power to Play Back Pens (All Lights Out) of Playback Unit.Caused by Blown Fuses of Recorder,Playback & Analyzer.Sensor & Portion of Circuit Boards Have Been Replaced | |
| U-600928, Ro:On 870506,reactor Manually Scrammed When Reactor Pressure Vessel Level Began to Rise.Caused by Failure of Feedwater Valve Controlling Flow of Water to Reactor to Open.Reactor Shut Down.State of Il & NRC Response Ctr Notified | 6 May 1987 | Ro:On 870506,reactor Manually Scrammed When Reactor Pressure Vessel Level Began to Rise.Caused by Failure of Feedwater Valve Controlling Flow of Water to Reactor to Open.Reactor Shut Down.State of Il & NRC Response Ctr Notified | |
| U-600890, Ro:On 870322,containment Isolation Occurred on Instrument Air Sys During Surveillance of ECCS Reactor Water Level Channel Functional Checklist.Cause Not Stated.Reactor Shut Down | 23 March 1987 | Ro:On 870322,containment Isolation Occurred on Instrument Air Sys During Surveillance of ECCS Reactor Water Level Channel Functional Checklist.Cause Not Stated.Reactor Shut Down |