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| Issue date | Title | Topic | |
|---|---|---|---|
| ML20115H011 | 17 July 1996 | Special Rept:On 960703,main Stack Wide Range Gas Radiation Monitor Sys Removed from Svc for Planned Mod.Sys Expected to Be Returned to Svc by 960830 After Mod Work Completed | |
| ML20115H768 | 17 July 1996 | Special Rept:On 960603,Unit 2 Vent Stack Wide Range Gas Radiation Monitor Sys Removed from Svc for Planned Mod.Sys Subsequently Returned to Svc on 960701.Mod Replaced | |
| ML20111B475 | 10 May 1996 | Special Rept:On 960422,vent Stack Wide Range Gas Radiation Monitor Sys Was Removed from Svc for Planned Mod.Field Survey Teams Would Be Dispatched to Monitor Radioactive Effluents as Defined in Plant Emergency Plan | |
| ML20092M175 | 22 September 1995 | Special Rept:On 950726,valid Failure of E-3 EDG Occurred Due to Dead Spot on Potentiometer Which Affected E-3 EDG Controller Output signal.E-3 EDG Returned to Operable Status Following Motor Operated Potentiometer Replacement | |
| ML20087H251 | 14 August 1995 | Special Rept:On 950726,non-valid Failure of E-3 EDG Occurred Due to Dead Spot on E-3 EDG Motor Operated Potentiometer (MOP).E-1 & E-3 EDG Mops Will Be Replaced W/New Type Mop During Future Mod Outages | |
| ML20086R517 | 25 July 1995 | Special Rept:On 950630,determined That Number 12 Cylinder on E-1 D/G Had Lower than Normal Operating Temps During Surveillance Test.Caused by Failure of Fuel Oil Injector Pump.Injector Pump Replaced & Satisfactorily Tested | |
| ML20078C170 | 24 October 1994 | Special Rept:On 940924,valid Failure of E-2 EDG Occurred. Caused by Problem w/4 Kv Breaker.Breaker Incorporated Into Preventive Maint Program to Replace Grease | |
| ML20071Q577 | 2 August 1994 | Special Rept:On 940706,valid Failure of E-4 Emergency Diesel Generator Occurred.Caused by Solenoid Valve Spuriously Sticking.Valves Replaced | |
| ML20064C301 | 28 February 1994 | Special Rept:On 940211,non Valid Failure of EDG E-4 Occurred When Voltage Shutdown Button Inadvertently Bumped.Maint Insp Initiated to Determine If Generator Damage May Have Occurred Due to Event.Remaining EDGs Were Operable | |
| ML20059A827 | 22 October 1993 | Special Rept:On 931012,valid Failure of EDG E-2 Occurred During Routine Monthly Test.Edg E-2 Declared Inoperable Due to High Fuel Oil Differential Pressure Condition.Edg E-2 Fuel Oil Filters Replaced | |
| ML20056G870 | 27 August 1993 | Special Rept:On 930803,discovered That Cylinder on 2-EDG Lower than Normal Operating Temps.Caused by Fuel Pin on Cylinder Injector Pump Not Fully Engaged | |
| ML20079L629 | 30 October 1991 | Special Rept:On 910916 & 23,cable Spreading & Computer Room CO2 Fire Protection Sys Out for Svc for More than 14 Days. Caused by Need to Provide for Worker Safety During Mod Work. Fire Detectors Verified Operable & Firewatch Stationed | |
| ML20077P970 | 15 August 1991 | Special Rept:On 910714,diesel Driven Fire Pump Out of Svc for More than Seven Days Due to Annual Preventative Maint Activities.Preventative Maint Completed & Pump Returned to Svc.Operability Testing Completed Satisfactorily on 910723 | |
| ML20064A465 | 27 August 1990 | Special Rept:On 900802,diesel-driven Fire Pump Declared Inoperable During Testing Due to Engine Overheating.Caused by Silt & Marine Biotic Life Plugging Y Strainer in Cooling Line.Strainer Cleaned & Retested | |
| ML20059B899 | 21 August 1990 | Special Rept:On 900802,diesel Driven Fire Pump Declared Inoperable During Testing Due to Engine Overheating.Diesel Generator E-2 Returned to Operable Status & motor-driven Fire Pump Declared Operable on 900807 | |
| ML20058N665 | 8 August 1990 | Special Rept:On 900802 & 07,diesel Driven & Motor Driven Fire Pumps,Respectively,Declared Administratively Out of Svc.Caused by Engine Overheating & Diesel Generator (DG) E-2 Out of Svc.Local Fire Depts Notified & DG E-2 Repaired | |
| ML20245H446 | 10 August 1989 | Ro:On 890710,diesel Driven Fire Pump Out of Svc for More than 7 Days.Caused by Disconnected Coolant Hose from Engine Block During Test,Draining Coolant from Engine & Heat Exchanger.Insp & Repair of Engine Performed | |
| ML20245J557 | 1 May 1989 | Ro:On 890331,motor Driven Fire Pump Out of Svc in Excess of 7 Days.Caused by Removal of Pump from Svc on 890324 to Allow Implementation of Electrical Mods.Diesel Driven Fire Pump Verified Operable & Tested Every 72 H | |
| ML20245B339 | 14 April 1989 | Special Rept:On 890303,seismic Monitoring Instruments Inoperable for More than 30 Days.Caused by Triaxial Accelerometer Cables Picking Up Electrical Noise Which Caused Spurious Alarms.Noise Filters Will Be Installed | |
| ML20195E501 | 3 November 1988 | Special Rept:On 881020,diesel Driven Fire Pump Failed to Start Automatically During Surveillance Test.Caused by Inadequate Test.Diesel Driven Fire Pump & auto-start Feature Tested & Rev of Fire Pumps Surveillance Tests in Process | |
| ML20205H256 | 21 October 1988 | Ro:On 881020,diesel Driven Fire Pump Failed to Start Automatically During Performance of Surveillance Test.Cause Under Investigation.Diesel Driven Fire Pump Subsequently Tested Successfully & Returned to Svc | |
| ML20154A726 | 2 September 1988 | Special Rept:On 880726,motor-driven Fire Pump Out of Svc for More than 7 Days.Caused by Action Taken to Allow Cleaning & Insp of of E-42 4 Kv bus.Motor-driven Fire Pump Restored to Operable Status on 880821 | |
| ML20154A961 | 1 September 1988 | Special Rept:On 880822,discharge Pressure Lost While Motor Driven Fire Pump in Operation.Caused by Crack That Formed in Column Pipe Flange Area Where It Bolts to Pump.Motor Driven Pump Removed from Pump Structure,Disassembled & Inspected | |
| ML20195B850 | 15 June 1988 | Special Rept:On 870215,packing Leak from RCIC Outboard Isolation Valve Reported to Operating Shift.Caused by Steam Leak.New Grease Replaced.On 870915,degradation to Motor Operator & Field Wiring Discovered.Components Replaced | Packing leak Stroke time |
| ML20154P359 | 27 May 1988 | Special Rept:On 880415,carbon Dioxide Fire Suppression Sys Taken Out of Svc for More than 14 Days.Caused by Continuous Fire Watch Required in Cable Spreading Room During Repair of Hole in Floor.Hole Repaired & Subj Sys Returned to Svc | Fire Barrier Continuous fire watch Fire Watch |
| ML20153B310 | 16 March 1988 | Special Rept:On 880302,E-224 440-volt Emergency Load Ctr Supply Breaker Tripped Open,Removing Power Supply for Motor Driven Fire Pump.Caused by Failure of Undervoltage Relay on E-22 Bus.Failed Relay Replaced | |
| ML20153B468 | 16 March 1988 | Revised Special Rept Re Diesel Driven Fire Pump out-of-svc for More than Tech Spec Limit of 7 Days.On 871111,diesel Driven Fire Pump Declared Inoperable.Probably Caused by Battery Failures.Surveillance Procedure Revised | |
| ML20196G552 | 7 March 1988 | Ro:On 880302 & 05,motor Driven Fire Pumps Declared Inoperable.Caused by Level in Storage Tank Dropped Due to Oil Being Transferred from Storage to Day Tank.Diesel Fuel Added Storage Tank to Bring Level Above 300 Gallon Limit | |
| ML20147G153 | 3 March 1988 | Ro:On 880302,both Fire Pumps Became Inoperable When Breaker E-224 for Motor Driven Fire Pump Tripped.Diesel Driven Fire Pump Taken Out of Svc for Maint on 880301.Caused by Failure of Bus E-22 Undervoltage Relay.Temporary Jumpers Installed | |
| ML20147C208 | 11 January 1988 | Special Rept:On 871216,planned Release of Liquid Radwaste from Laundry Drain Tank B Made W/O Being Treated as Described in Limiting Condition of Operation 3.8.B.4.Caused by Procedural Deficiency.Procedure Revised | |
| ML20238C507 | 21 December 1987 | Special Rept:On 871111,diesel-driven Fire Pump Failed Surveillance Test & Declared Inoperable.Cause Unknown.Four Sets of Cells for Two Batteries Replaced & Charged W/Portable Charger.Surveillance Test Procedure Revised | |
| ML20236K911 | 3 August 1987 | Ro:On 870731,motor Driven Fire Pump Automatically Started on Decreasing Header Pressure at 140 Psig.Caused by Personnel Digging in Yard Directly Behind Radwaste Bldg.Affected Portion of Fire Header Isolated for Repair of Leak | |
| ML20214W769 | 5 June 1987 | Special Rept:On 870428,bus E22 Deenergized to Perform Series of outage-related Mods,Causing Motor Driven Fire Pump to Be out-of-svc for More than 7 Days,In Violation of Tech Specs. Motor Driven Fire Pump Restored to Svc on 870515 | |
| ML20214U034 | 4 June 1987 | Special Rept:During Update of Safe Shutdown Data Base, Conditions Re Unencapsulated Cables in Fire Areas Identified as Reportable Per Confirmatory Action Ltr 86-07 & App R. Caused by Exclusion from Previous Analysis.Fire Watch Begun | Safe Shutdown Fire Watch |
| 05000000/LER-1986-009, Ro:On 860312,discovered That LER 2-86-04 & LER 86-009 Not Submitted to Nrc.Caused by Misplaced Repts.Repts Telecopied to Nrc.Procedure for Distribution of Repts Revised | 14 April 1986 | Ro:On 860312,discovered That LER 2-86-04 & LER 86-009 Not Submitted to Nrc.Caused by Misplaced Repts.Repts Telecopied to Nrc.Procedure for Distribution of Repts Revised | |
| ML20199F440 | 27 March 1986 | Special Rept:On 860216,during Cold Shutdown,Condensate Storage Tank (CST) Filled & Overflowed Into CST Moat & Outside Moat.Caused by Blown Fuse Resulting in Removal of Power from Hotwell Level Controllers.Fuse Mods Considered | |
| ML20093F195 | 21 September 1984 | RO MM-3-03:on 840823,routine Surveillance Testing Indicated Three Moisture Sensors in Recirculation Sys Moisture Monitoring Sys Functioning Improperly.Cause Not Determined. Hourly Monitoring Being Performed | |
| ML20096F490 | 14 August 1984 | RO-MM-3-02:on 840715,surveillance Test Revealed Malfunctioning of Moisture Sensors in Recirculation Sys Moisture Monitoring Sys.Cause Unknown.Hourly Monitoring of Drywell Sump Collection Initiated Until Next Outage | |
| ML20094F445 | 23 July 1984 | RO MM-3-01:on 840622 & 25,moisture Sensors in Recirculation Sys Moisture Monitoring Sys Functioned Improperly.Cause Unknown.Drywell Sump Collection Sys Monitored Hourly Until Next Outage | |
| ML20083Q023 | 23 March 1984 | Ro:On 840224,during Verification of Moisture Monitoring Sys,Point 7 Failed.Cause Will Be Determined During Next Outage W/Drywell Deinerted.Drywell Sump Collection Sys Will Be Monitored Hourly | |
| ML20083P963 | 12 March 1984 | Ro:On 840209,CO2 Fire Protection Sys,Serving Cable Spreading Room & Computer Room,Declared Inoperable.Caused by Ground in One of Two Cables from Smoke Detector Control Panel.Cables Replaced & Sys Available for Svc | Continuous fire watch |
| ML20083P820 | 5 March 1984 | Ro:On 840125,moisture Sensor in Recirculation Sys Moisture Monitoring Sys Functioned Improperly & Sys Declared Inoperable.Caused by Failed Techmark Limited Moisture Sensor Circuit Card.Sensor Replaced | |
| ML20080A773 | 16 January 1984 | Ro:On 831128,from 830830-1128,seismic Monitoring Sys Inoperable.Caused by Personnel Oversight.Startup check-off List Modified to Require Maint Request | |
| ML20069L317 | 11 April 1983 | Corrected RO 3-83-11/1P:on 830407,full-in Position Signal Jumpered Into Probe Buffer Cards.Control Rods Could Have Been Withdrawn W/O Initiating Single Control Rod Interlock. Caused by Personnel Error.Jumpers Removed | |
| ML20079L268 | 15 February 1983 | RO 3-83-08/1P:on 830214,three of Eight MSIVs Failed to Pass Tech Spec Limit of 11.5 Scfh & Containment Isolation Valve Mo 2-74 Failed Leak Rate Test.Caused by Abnormal Wear of Valve Internals.Valves to Be Inspected & Repaired | |
| ML20066A581 | 28 October 1982 | RO 2-82-36/1P:on 821024,71J Safety Relief Valve Opened When Pressure Reached 832 Psig.Cause Unknown.Valve to Be Sent to Vendor.Two Vacuum Breakers Replaced.Fatigue Analysis Determined Downstream Piping Not Overstressed | |
| ML20066A939 | 25 October 1982 | Ro:Response Spectrum Analyzer Component of Seismic Monitoring Sys Intermittently Inoperable Since 820909.Caused by Malfunctioning Power Control Card.Card Will Be Replaced. Component to Be Returned to Svc by 821130 | |
| ML20058B710 | 14 July 1982 | Ro:On 820619,during Scheduled Loss of Power Test on Unit 2, Inadvertent Startup of ECCS on Unit 3 Initiated While at Full Power.Caused by Defective Elma Dc Power Supply to 24-volt Dc Logic Circuit | |
| ML20055B518 | 13 July 1982 | RO Advising That Triaxial Accelerometer Devices in Reactor Core Isolation Cooling Sys Pump Room Inoperable for More than 30 Days.Replacement Detector to Be Installed by 820831 | |
| ML20126L144 | 20 May 1981 | RO 2-81-32/1P:on 810520,w/units in Shutdown Condition, re-evaluation of Concrete Block Walls Identified Four Walls Unstable Under Effects of Tornado Depressurization & Cardox Injection.Caused by Const or Design Error |