Semantic search
Jump to navigation
Jump to search
| Issue date | Title | Topic | |
|---|---|---|---|
| ML20199L530 | 19 January 1999 | Special Rept:On 981214,seismic Monitor Was Declared Inoperable.Caused by Spectral Analyzer Not Running.Attempted to Reboot Sys & Then Sent Spectral Analyzer to Vendor for Analysis & Rework.Upgraded Sys Will Be Operable by 990331 | Earthquake |
| ML20237F029 | 27 August 1998 | Special Suppl Rept:On 960425,one Loose Part Detection Sys (Lpds) Was Identified to Be Inoperable.Initially Reported on 960531.Caused by Loose Parts Detector Module.Repairs Performed & Intermittent Ground No Longer Present | |
| ML20198S662 | 10 November 1997 | Special Rept:On 971009,during D21 EDG Monthly Surveillance Test,Engine Speed Was Cycling Unusually,Load Oscillations Observed on Control Room Indicators & Flame Emanated from Exhaust Stack.Caused by EDG Internal Forces.Repaired EDG | |
| ML20211H795 | 29 September 1997 | Special Rept:On 970828,EDG Failure Occurred Due to Fuel Oil Leak on Fuel Oil Return Header Tube at Number Four Cylinder. Interim Repair Performed by Removing & Replacing Damaged Section of Tubing | |
| ML20198E739 | 4 August 1997 | Special Rept:On 970703,diesel Generator Failed Surveillance Test Procedure ST-6-092-311-2.Caused by Motor Operated Potentiometer (Mop) Set Below Its Normal 60 Hz Position. Stroked Mop Through Full Travel While Monitoring Resistance | |
| ML20136H210 | 14 March 1997 | Special Rept:On 961001,suppl for Inoperability of loose-part Detection Sys Channel for More than 30 Days.Channel/Detector Malfunction Isolated to Instrumentation Contained within Inerted Unit 2 Primary Containment | |
| ML20136H129 | 10 March 1997 | Special Rept:On 970103,LPDS Declared Inoperable.Caused by Defective Latch Board.Board Replaced & ST Procedure Was Completed Satisfactorily on 970114 | |
| ML20134D239 | 30 January 1997 | Special Rept:On 970101,failure of Diesel Generator Occurred. Caused by Loose Wire.Removed Banana Jacks from Terminals, Tightened Wires on Terminal Block & Returned Diesel Generator to Operable Status | |
| ML20128H339 | 1 October 1996 | Special Rept:On 960828,channel/detector Which Monitors Acoustic Level on 'B' Main Steam Line Annunciated in Mcr. Channel/Detector Malfunction Was Isolated to Instrumentation Contained within Inerted Unit 2 Primary Containment | |
| ML20112F792 | 6 June 1996 | Special Rept:On 960507,D22 EDG Declared Inoperable.Caused by D22 EDG Crankcase Overpressurization Exhaust Backpressure. D22 EDG Exhaust Stack Scraped & Ion Oxide Scale Sheets Removed from Sidewalls | |
| ML20117J975 | 31 May 1996 | Special Rept:On 960425,inoperability of loose-parts Detection Sys Channel for More than 30 Day Identified. Work Order Initiated to Inspect Instrumentation | |
| ML20107L250 | 23 April 1996 | Special Rept:On 960312,two loose-part Detection Sys Channels Inoperable for More than 30 Days.Caused by Failure of Sensor.Repaired Control Rod Housing 02-31 Lpds Channel Sensor | |
| ML20101G781 | 25 March 1996 | Special Rept:On 960224,D21 EDG Declared Inoperable,Due to Inability to Control EDG Load.Loose Connection at Output of Motor Potentiometer Tightened | |
| ML20099L765 | 28 December 1995 | Special Rept:On 951130,EDG D21 Experienced Pressurization of Crankcase During Performance of Surveillance Tests.Analysis of Failure Continuing.Corrective Actions to Prevent Recurrence Will Be Developed & Implemented as Necessary | |
| ML20094M014 | 15 November 1995 | Special Rept:On 951017,valid Failure of EDG Occurred While Performing Surveillance Test Procedure ST-6-092-316-1.Caused by Overvoltage Permissive Relay in Output Breaker Closing Logic Not Picking Up.Relay Recalibr & Returned to Svc | |
| ML20086G592 | 7 July 1995 | Special Rept:On 950507 & 10,loose Part Detection Sys (Lpds) Channel Sensor Found to Be Not Mounted on Piping.Cause Not Yet Determined.Sensor Reattached to Pipe & Channel Returned to Operable Status | Scaffolding |
| ML20077E251 | 5 December 1994 | Special Rept:On 941124,accelerograph Sensor Inoperable for More than 30 Days.Seismic Recorder XR-VA-105 & Accelerograph Sensor XE-VA-105 Declared Inoperable on 941025.Loose Power Cable to Seismic Record XR-VA-105 Tightened | Earthquake |
| ML20073F745 | 23 September 1994 | Special Rept:On 940810,describing Sequence of Events & Decisions Surrounding Potential Noncompliance W/Safe Shutdown Commitments | Hot Short Safe Shutdown Time of Discovery Reactor Vessel Water Level Fire Barrier Fire Protection Program Hourly Fire Watch |
| ML20069D696 | 31 May 1994 | Special Rept:On 940422,noted Inoperability of loose-part Detection System for More than 30 Days.Caused by Tape Recorder Not Advancing in Play Mode.Tape Recorder Was Repaired,Tested & Declared Operable | |
| ML20062L607 | 23 December 1993 | Special Rept:On 930526,discovered That Triaxial Response Spectrum Analyzer (Trsa) Could Not Be Properly Calibr & Was Inoperable.Trsa Returned to Vendor on 930626 But Could Not Be Repaired Due to Lack of Spare Parts | Earthquake |
| ML20128B956 | 28 January 1993 | Special Rept:On 930102,ST Procedure in Progress D21 EDG Kilowatt Output Was Erratic & Unstable.Caused by Loose Wire on D21 EDG Electronic Governor.Unit 1 EDGs Were Inspected & Verified Not to Have Same Conditions | Safe Shutdown Earthquake |
| ML20126E875 | 18 December 1992 | Special Rept:On 921125,EDG D21 Output Began Erratically Increasing & Decreasing When Control Logic Converted to Isochronous Mode.Caused by Test Start Circuit Deenergizing. Damaged Wire Repaired & Shortened & Governors Inspected | |
| ML20115D898 | 16 October 1992 | Special Rept:On 920909,discovered That Channel 1 (Longitudinal Axis of Three Orthogonal Axes) of Accelerograph Sensor Failed Test Criteria.Cause Not Yet Determined.Maint Work Request Initiated on 920922 | Earthquake |
| ML20114B955 | 25 August 1992 | Special Rept:On 920730,intermittent Operation of Speed Control Response Occurred While Attempting to Synchronize EDG D24 to 4 Kv Safeguard Bus.Caused by Loose Fuse Clip Contacts in 125-volt Dc Circuit.Contacts Tightened | Safe Shutdown Safe Shutdown Earthquake |
| ML20083B937 | 18 September 1991 | Special Rept:On 910823,D23 Emergency Diesel Generator Declared Inoperable While Plant Personnel Performed Troubleshooting Activities to Resolve Discrepancy Between D23 EDG Local & Remote Kw Meters | |
| ML20153G313 | 1 September 1988 | Special Rept:On 880817,primary & Secondary Meteorological Towers Declared Inoperable.Caused by Towers Being Struck by Lightning During Thunderstorm.Tower Sensors Returned to Svc on 880823 & Air Temp Difference Sensors Being Replaced | |
| ML20151P107 | 12 July 1988 | Special Rept:On 880602,six Triaxial Time History Accelerographs Declared Inoperable Due to Inadequate Calibr Surveillance Tests.Tests Revised to Incorporate tilt-table Testing of Accelerographs | Operating Basis Earthquake |
| ML20215C078 | 12 June 1987 | Special Rept:On 870518,triaxial Peak Recording Accelerograph XR-VA-151 Inoperable.Caused by Need to Remove Instrument in Support of Removing Vessel Head for Refueling.Recording Accelerograph to Be Reinstalled After Refueling | |
| ML20214X107 | 5 June 1987 | Special Rept:On 870505,diesel Generator Excitation Circuitry Failed.Caused by Loose Connection of Two Leads on Bottom of Relay K1.Relay K1 Contactor & Two Damaged Leads Removed & Replaced | Safe Shutdown |
| ML20210S390 | 29 September 1986 | Special Rept:On 860624,performance of Surveillance Test on Triaxial Response Spectrum Analyzer (Trsa) Indicated That Unit Inoperable.Caused by 240-ohm Resistors Overheating. Defective Amplifier Replaced.Related Correspondence | |
| ML20210S353 | 16 September 1986 | Special Rept:On 860903,north Stack Wide Range Accident Monitor Declared Inoperable Due to Failure of Sample Pump to Provide Proper Sample Flow.Caused by Torn Diaphragm.Pump Replaced.Related Correspondence | |
| ML20209G817 | 31 July 1986 | Special Rept:On 860624,discovered Triaxial Response Spectrum Inoperable During Semiannual Surveillance Test. Cause Unknown.Analyzer Will Be Shipped to Mfg for Repairs. Related Correspondence | |
| 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 | |
| ML20203G024 | 24 March 1986 | Special Rept:On 860102,HPCI Sys Actuated & Water Injected Into Reactor Pressure Vessel Through Loop B Core Spray Nozzle Only.No Corrective Action Will Be Taken Since HPCI Operated as Designed to Control Level | |
| ML20155F246 | 5 March 1986 | Special Rept:On 860102 & 13,RCIC Sys Actuated & Injected to Reactor Pressure Vessel.Caused by Potential Low Water Level During Planned Turbine Trip & Decreasing Water Level, Respectively.Related Correspondence | |
| ML20140F127 | 28 February 1986 | Rev 1 to 860131 Special Rept:On 851109,HPCI Into Reactor Vessel Occurred.Rev Changes Reactor Parameter Entitled Coolant Pressure to Coolant Temp. Related Correspondence | |
| ML20141E617 | 12 February 1986 | Special Rept:On 851218,RCIC Sys Actuated & Injected Water Into Reactor Vessel During Startup Test Condition 6.Reactor Water Level Dropped & RCIC Quick Started Manually to Control Reactor Level.No Corrective Action Taken | |
| ML20154G068 | 31 January 1986 | Special Rept:On 851105 & 09,two HPCI Sys Actuations & Injections Into RCS Occurred During Startup Testing.No Adverse Effects Noted.No Corrective Actions Necessary | |
| ML20137C486 | 14 November 1985 | Special Rept:On 850816,0911,12 & 16 During Startup Testing, RCIC Sys Actuations & Injections Into RCS Occurred.Incidents Part of Startup Testing.No Corrective Actions Required | |
| ML20132D370 | 15 July 1985 | Revised Special Rept Re Cause & Corrective Actions for Inoperable Seismic Monitoring Instrumentation.On 850626,test Results of Triaxial Response Spectrum Analyzer Satisfactory. Related Correspondence | |
| ML20128K184 | 13 June 1985 | Special Rept:On 850501,surveillance Test for Triaxial Response Spectrum Analyzer Revealed That Acceptable Limits for Specific Acceleration Input of Negative 0.05g Could Not Be Met.Cause Undetermined.Investigation Continuing | |
| ML20129J008 | 24 May 1985 | Special Rept:On 850227,0301,0403,06,09 & 12,during Startup Testing,Rcic Sys Actuations & Injections Into RCS Occurred. No Corrective Action Required | |
| ML20127E800 | 1 May 1985 | Ro:On 850131,full Reactor Scram Occurred.Caused by Operator Opening Instrument Isolation Valve on Jet Pump PDI-42-IR005. Shifts Notified That Valving on Racks to Be Done by or W/Instrument & Controls Technicians | |
| ML20113B872 | 18 March 1985 | Ro:On 850308,peak Acceleration Recorder Declared Inoperable Following Insp.Caused by Melting of Mounting Matl Used to Support Recorder Due to High Temp Inside Drywell Head Area.Recorder Replaced | |
| ML20114A033 | 27 December 1984 | Ro:On 841118,alarms Received in Control Room Indicating Downscale,Upscale & Inoperability of Source Range Monitor D & intermediate-range Monitors D & H Detector Channels. Caused by 20-volt Dc Power Shorted by Technician | Half scram |