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Pages in category "Pages with broken file links"
The following 200 pages are in this category, out of 59,950 total.
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- 05000146/LER-2003-001, Failure to Verify Operability of the Containment Vessel Intrusion Alarm
- 05000146/LER-2003-002, Re Failure of the Decommissioning Support Facility Intrusion Alarm
- 05000155/LER-1978-001, Forwards LER 78-001/03L-0
- 05000155/LER-1978-001-03, /03L-0:on 780109,diesel Fire Pump Starting Time Exceeded Core Cooling Criteria.Caused by Cold Weather Conditions.Ventilation Louvers in Screen House Sealed to Reduce Heat Loss in Room.Item Added to Cold Weather Checks
- 05000155/LER-1978-002, Forwards LER 78-002/03L-0
- 05000155/LER-1978-002-03, /03L-0:on 780119,during Monthly Specific Gravity Readings in Reactor Depressurization Sys Battery A,Cell 12 Read Lower than Tech Spec Limit.Caused by Loss of Electrolyte Through Sampling.Electrolyte Added
- 05000155/LER-1978-003, Forwards LER 78-003/01T-0
- 05000155/LER-1978-003-01, /01T-0:on 780120,during Routine Leak Rate Testing of Containment Ventilation Isolation Valves,Supply Valve CV-4097 Leaked in Excess of Tech Specs.Caused by Valve Disc Out of Alignment & Misadjusted Disc Ring
- 05000155/LER-1978-004-03, /03L-0:on 780202,emergency Diesel Generator Overall Response Time Exceeded Required Starting Time of 13.9-s.Cause Undetermined.Maint Personnel Continuing Observation of Starting Characteristics
- 05000155/LER-1978-005-03, /03L-0:on 780203,during Plant Startup,Proper Offgas Sample Monitor Flow Could Not Be Established Using Flow Control Valves in Sample Sys.Probably Caused by Inadequate Cleaning of Flow Instrument by Maint Personnel
- 05000155/LER-1978-006-03, /03L-0:on 780208,following Abnormal Test Light Indication on Reactor Depressurization Sys Control Sys,One Loop of Sys Channel D Was Made Inoperable to Isolate Cause of Abnormal Indication.Cause Not Stated
- 05000155/LER-1978-007-03, /03L-0:on 780209,during Routine Test Operation of Emergency Diesel Generator,Unit Tripped on High Water Temp After 25 Minutes of Operation.Caused by Leakage of Cooling Water Pump Shaft Packing Causing Cooling Sys Suction Los
- 05000155/LER-1978-008-01, /01T-0:on 780215,during Maint of Reactor Depressurization Sys Control Circuitry,Fire Pump Control Switches Inadvertently Placed in Inhibit Position Incorrectly.Control Switches Marked W/Instructions
- 05000155/LER-1978-009-03, /03L-0:on 780215,following Abnormal Test Light Indication on Reactor Depressurization Sys Control Sys, Each of Four Depressurization Loops Was Made Inoperable to Isolate Cause of Indication.Cause Not Stated
- 05000155/LER-1978-010-01, /01T:on 780217,during Review of Electrical Equipment Required for Loca,Steam Drum Low Level Switches Deemed Inadequate for High Temp Environ.Caused by Reactor Protection Sys Not Being Evaluated
- 05000155/LER-1978-011-01, /01T-0:on 780217,during Equipment Review, Unqualified Scram Pilot Solenoid Valve NC-27B Was Found Installed in F2 Drive Scram Valve Sys.Pilot Solenoid Was de-energized & Exhaust Function Verified
- 05000155/LER-1978-012-01, /01T-0:on 780217,during Equipment Review,Pilot Solenoid Valve SV-879 Was Deemed Inadequate to Perform in Postulated Accident Environ.Pilot Solenoid Is de-energized & Will Be Mainted in Safe Condition Until Mods Completed
- 05000155/LER-1978-013-03, /03L-0:on 780309,following Abnormal Indication on Automatic Test Circuit for Reactor Depressurizing Sys, Channel D Actuation Cabinet Removed from Svc to Facilitate Trouble Shooting
- 05000155/LER-1978-014-03, /03L-0:on 780311,operator Observed Test Enable Light Indication on Actuation Channel a of Reactor Depressurization Sys.Caused by Defective Electronic Module in Sensor Channel D.Module Repair in Progress
- 05000155/LER-1978-015, Forwards LER 78-015/03L-0
- 05000155/LER-1978-015-32, /03L-0:on 780223,potentially Submerged Electrical Circuitry for Reactor Containment Water Level Indication Was Deemed Marginal by Evaluation.Caused by Original Const.Cable Splicing Retaped W/Waterproof Rubber Tape
- 05000155/LER-1978-016-03, /03L-0:on 780320,daily Primary Leakage Exceeded Allowable Limit.Cause Not Stated.Excess Leakage Classified as Identified.Flange O Rings Will Be Replaced During Future Outage
- 05000155/LER-1978-017-03, /03L-0:on 780320,during Period of Reduced Power, Control Rod Drive F-2 Scram Pilot Valve Control Switch Was Reset from Tripped Position Contrary to Instructions.Cause Due to Vague Instructions.Procedures Under Review
- 05000155/LER-1978-018-03, /03L-0:on 780406,one of Two Low Drum Scram Sensors in Each of Two Reactor Protection Channels Failed to Operate.Caused by Binding of Switch/Pointer Mechanism on Scale Plate Inside Cover.New Cover & Scale Plate Installed
- 05000155/LER-1978-019-03, /03L-0:on 780406,during Investigation of Anomalies Re Load Rejection & Scram from Reduced Condenser Vacuum, Switch PS652 Was Found Out of Tolerance.Caused by Minor Drift.Switch Recalib & Tested
- 05000155/LER-1978-020-03, /03L-0:on 780411,during Power Operation,Off Gas Monitor Sample Flow Was Low & Radiation Monitoring Sys Deemed Inoperable.Caused by Foreign Deposits on Needle Valve Sample Flow Control.Valves Will Be Cleaned Regularly
- 05000155/LER-1978-021-03, /03L-0:on 780415,during Reactor Power Operation, Reduced Capacity Operation of 138 Kv Offsite Power Source Occured.Caused by Authorized Mods to Offsite Electrical Substation.No Corrective Action Required
- 05000155/LER-1978-022-03, /03L-0:on 780417,138 Kv Line Was de-energized Due to Switching Error.Caused by Deficient Procedure.Switching Procedure Review Requirements Modified by Offsite Personnel
- 05000155/LER-1978-023, Forwards LER 78-023/03L-0
- 05000155/LER-1978-023-03, /03L-0:on 780504,during Routine Weekly Checks of Fire Pump Diesel Starting Battery a Electrolyte Level Found Below Top of Plates in Cells 1,3 & 5 of Battery Unit 1.Cause Unknown.Battery Unit 2 Replaced on 780516
- 05000155/LER-1978-025, Forwards LER 78-025/03L-0
- 05000155/LER-1978-025-03, /03L-0:on 780525,electrolyte Level Found Below Top of Plates in Cells 1 & 6 of Diesel Fire Pump Battery Unit 1. Caused by Failure to Maintain Normal Electrolyte Levels. Personnel Instructed to Fill Opening Ring to Provide Ma
- 05000155/LER-1978-026-03, /03L-0:on 780531,following Scram While Still in Power Operation,Condensate Storage Tank Dropped to 61% While Steam Drum Water Inventory Was Maintained by Manual Control. Caused by Personnel Oversight
- 05000155/LER-1978-028-03, /03L-0:on 780605,emergency Condenser Outlet Valve MO-7053 Deemed Automatically Inoperable in Closed Position After Manual Tightening of Valve to Stop Leakage.Cause of Leakage Unknown & Will Be Investigated at Future Shutdown
- 05000155/LER-1978-029-03, /03L-0:on 780606,daily Unidentified Primary Sys Leakage Exceeded Allowable Limits.Caused by Drive Flange O Ring Seal Deterioration.Degradation Will Be Investigated & Repaired During Future Outage
- 05000155/LER-1978-030, Forwards LER 78-030/03L-0
- 05000155/LER-1978-030-03, /03L-0:on 780712,channel B of Reactor Depressurization Sys Removed from Svc After Trouble Alarm When Battery for Loop Placed on Overcharge.Caused by Blown Fuse Due to Diode Failure in Annunciator Circuitry
- 05000155/LER-1978-032, Forwards LER 78-032/03L-0.W/o Encl
- 05000155/LER-1978-032-03, /03L-0 on 780819:Failure of Check Valve Providing Containment Integrity in 2 Demineralized Water Line Contributed to Containment of Plant Demineralized Water Sys Check Valve Repaired 780905
- 05000155/LER-1978-033, Forwards LER 78-033/03L-0
- 05000155/LER-1978-033-03, /03L-0 on 780829:during Tests of Automatic Containment Isolation Valves,Valve CV/4027 Exhibited Excessive Leakage.Valve & Piping Flushed & Leakage Test Repeated Satisfactorily.(Encl to 7810060072)
- 05000155/LER-1978-034-03, /03L-0 on 780831:during Monthly Specific Gravity Readings on Reactor Depressurization Sys,Battery A,Cell 12 Read 1.193 Below Limit of 1.200 Specified in Tech Specs. Cause Unknown & Cell Was Replaced.(Encl to 7810060072)
- 05000155/LER-1978-035, Forwards LER 78-035/01L & LER 78-037-01L on 780906
- 05000155/LER-1978-035-01, /01L on 780904:During Test of Containment Ventilation Isolation Valves,Supply Valve CV/4097 Leaked in Excess of TS Criteria.Butterfly Valve Disc Seal Was Readjusted & Valved Returned to Svc. (Encl to 7809190156)
- 05000155/LER-1978-044, Forwards LER 78-044/01X-1
- 05000155/LER-1978-044-01, /01X-1 on 781019:during Startup,Minor Leak Discovered at 3/4 Inch Vent Pipe Weld Attachment on 3 Inch Return Line from clean-up Sys to Reactor Recirculating Loop 2.Caused by Crack in Stainless Steel.Code Repairs Made
- 05000155/LER-1978-047-03, During Plant Startup, Control Rod Drive Temp on Drive E-2 Exceeded Tech Specs. Caused by Failure of Metal O-Ring Seal at Flange.New Seal Ring Installed Prior to Plant Startup.All O-Rings Replaced
- 05000155/LER-1978-048, Forwards Updated LER 78-048/03X-1
- 05000155/LER-1978-048-03, During Power Operation, Noted Emergency Condenser Shell Side Temp Was 205 F.Temp Returned to Normal Levels When Inlet Valve in Loop 2 Closed. Caused by Improperly Fitted Gate Valve Disc
- 05000155/LER-1979-001, Forwards LER 79-001/03L-0
- 05000155/LER-1979-001-03, /03L on 790201:during Testing of Two Containment Ventilation Supply Isolation Valves,Noted Containment Integrity Might Be Jeopardized.Caused by Maladjustment of Valve CV/4097 Disc Seal
- 05000155/LER-1979-002-03, /03L-0 on 790203:condenser Hotwell Fill Valve CV/4009 Failed to Open During Normal non-safety Usage After Plant Shutdown.Caused by Failed Diaphragm in Valve Operator. Diaphragm Replaced & Tested Satisfactorily
- 05000155/LER-1979-003-03, /03L-0 on 790204:during Routine Testing of Two Containment Isolation Check Valves,Excessive Leakage Was Noted.Caused by Minor Dirt Deposits in Check Valve Seats.One Valve Cleaned & Other Replaced
- 05000155/LER-1979-004-01, /01T-0 on 790219:insp Revealed Unacceptable Weld in 6 Inch Inlet Line to Emergency Condenser.Caused by External Undercut & Insufficient Weld Filler on Weld External Cap.Will Repair Following Refueling Outage
- 05000155/LER-1979-005-01, /01T-0 on 790219:during Testing of Control Rod Drive Scram Accumulator Level Switches,Seven Switches Failed to Operate.Caused by Broken or Marginal Reed Switches. Switches Replaced or Repaired
- 05000155/LER-1979-006-01, /01T-0 on 790221:during Weld Insps of Steel Pipe Junctions in Reactor Cleanup sys,crack-like Indications Found on Outside Diameter.Caused by Unknown Factors.Repairs Will Be Performed
- 05000155/LER-1979-007-01, /01T-0 on 790222:unacceptable Weld Found in 6 Inlet Line to Emergency Condenser.Identified as 6-ECS-102-2. Will Repair Prior to Startup
- 05000155/LER-1979-008, Forwards LER 79-008/03L-0,79-009/03L-0 & 79-010/03L-0
- 05000155/LER-1979-008-03, /03L-0 on 790227:starting Time of Emergency Diesel Generator Test Exceeded Criteria.Caused by Use of Fuel Priming Pump Possibly Introducing Air Into Fuel Lines
- 05000155/LER-1979-009-03, /03L-0 on 790223:feedwater Check Valve Leakage Exceeded Test Criteria.Incident Repetitive.Caused by Scale Particles on Valve Seat Preventing Tight Seal.Scale Removed & Seat Polished
- 05000155/LER-1979-010-03, /03L-0 on 790221:during Test of Backup Supply Hose for post-incident Heat Exchanger,Hose Would Not Reach Exchanger.Caused by Snow Obstruction.Longer Hose Will Be Provided
- 05000155/LER-1979-015-03, /03L-0 on 790319:during Plant Shutdown,Inverter Power Supply for One Containment Vacuum Loop Was Not Operating.Blown Fuse Found.Caused by Dirty Circuits Due to High Ventilation Air Flow.Unit Cleaned
- 05000155/LER-1979-016-99, /99X-0 on 790313:during Reinstallation of Electric Fire Pump 480 Volt Circuit Breaker Following Routine Tripping,Breaker Case Was Cracked When Cable Lugs Were Tightened.Caused by Personnel Error.Personnel Instructed
- 05000155/LER-1979-018, Forwards LER 79-018/01X-1
- 05000155/LER-1979-018-01, /01X-1:on 790420,following Maint,Minor Water Leak Observed Between Reactor Vessel & Rod Drive Housing.Caused by Bad Weld.Mechanical Expansion of Drive Housing Against Vessel Wall Sealed Leak Path Accomplished
- 05000155/LER-1979-019-03, /03L-0 on 790418:following Scram & During Routine Primary Sys Leak Rate Testing,Unidentified Leakage Observed at 1.86 Gpm.Apparent Cause Was Cooling Water Temp Transients
- 05000155/LER-1979-020, Forwards LER 79-020/01T-0
- 05000155/LER-1979-020-01, /01T-0 on 790609:vibration Heard in Primary Sys W/Recirculation Pump in Svc.Discovered Diffuser Dislodged in Pump 1 Inlet & Loose Diffuser in Pump 2 Inlet.Caused by Failure of Bolts Holding Diffuser for Reasons Unknown
- 05000155/LER-1979-021, Forwards LER 79-021/03L-0
- 05000155/LER-1979-021-03, /03L-0 on 790616:static Inverter Power Supply for One Containment Vacuum Relief Loop Found de-energized. Caused by Blow Input Fuse.Fuse Replaced & Routine Equipment Checks Undertaken
- 05000155/LER-1979-022, Forwards LER 79-022/01T-0
- 05000155/LER-1979-022-01, Design Review Revealed That,During Loca,Automatic Initiation of Reactor Scram, Containment Isolation,Core Spray & Reactor Depressurization May Not Function
- 05000155/LER-1979-023, Forwards LER 79-023/03L-0
- 05000155/LER-1979-023-03, /03L-0:on 790911,automatic Isolation Valve CV/4027 Exhibited Leakage in Excess of Tech Spec Limit.Caused by Disc Contact Area on Seating Surface Not Providing Tight Shutoff Capability.Seat Was Machined & Valve Was Retested
- 05000155/LER-1979-024, Forwards LER 79-024/03L-0
- 05000155/LER-1979-024-03, /03L-0:on 790913,set Points for Pressure Switches on Reactor Depressurizing Sys Pump Discharge Drifted Below Tech Spec Requirement.Cause Not Known.Pressure Switches Were Reset to Trip at 105 Psig
- 05000155/LER-1979-025, Anonymous Comment Superimposed on LER 79-025/01X-0
- 05000155/LER-1979-025-01, /01T-0:on 791030,failure in Electronic Power Supply Prevented Closure of Containment Ventilation Supply Isolation Valves CV4096 & CV4097.Caused by Transistor Failure in Power Supply Es 8501A
- 05000155/LER-1979-026, Forwards LER 79-026/03L-0
- 05000155/LER-1979-026-03, /03L-0:on 791101,during Monthly Specific Gravity Checks on Reactor Depressurizing Sys,Battery C,Cell 48 Read Below Tech Spec Limit.Plant in Shutdown Stage.Cause Undetermined.Cell Replaced on 791103 Prior to Plant Startup
- 05000155/LER-1979-027, Update to LER 79-027/03X-1:on 791115,through Seat Leakage Occurred at Outlet Valve M07053 of Loop 2.Cause Not Determined by Vendor Investigation.Valve Packing Replaced & Valve Stem Gearing Lubricated
- 05000155/LER-1979-027-03, /03L-0:on 791115 During Power Operation,Emergency Condenser Sys Temps Indicated Leakage at Outlet Valve.Cause Will Be Investigated at Future Shutdown.No Leakage from Primary Sys Occurred
- 05000155/LER-1979-028, Forwards LER 79-028/01T-0
- 05000155/LER-1979-028-01, /01T-0:on 791213,design Review of CV4097 & CV4095 Containment Isolation Valves Indicated Valves Might Not Close Under Worst LOCA Pressure Conditions Unless Already Partially Closed.Caused by Inadequate Specs
- 05000155/LER-1979-029, Forwards LER 79-029/03L-0
- 05000155/LER-1979-029-03, /03L-0:on 791215,neither Plant Ventilation Exhaust Fan Operating During 8-minute Planned Activity.Caused by Turning Off Fans to Facilitate Maint.Tech Specs Will Be Revised
- 05000155/LER-1980-001, Forwards LER 80-001/03L-0 & Update of LER 79-027/03X-1
- 05000155/LER-1980-001-03, /03L-0:on 800114,temp Data for Loop 2 of Emergency Condenser Sys Revealed Through Seat Leakage on Normally Closed Outlet Valve M07053.Cause to Be Investigated at Future Shutdown
- 05000155/LER-1980-002-03, /03L-0:on 800124,during Monthly Specific Gravity Checks,Cell 14 of Battery for Channel C of Reactor Depressurizing Sys Read Below Tech Spec.Cause Not Stated. Channel Removed from Svc to Replace Defective Cell
- 05000155/LER-1980-003-03, /03L-0:on 800123,following Automatic Test Circuit Alarm Indication,Channel D of Reactor Depressurizing Sys Removed from Svc for Troubleshooting.Caused by Automatic Test Circuit Component Failure
- 05000155/LER-1980-004, Forwards LER 80-004/01T-0
- 05000155/LER-1980-004-01, /01T-0:on 800201,investigation of Minor Temp & Pressure Changes in Reactor Cooling Water Auxiliary Sys Revealed Broken Air Tubing Line to Control Valve CV4029. Possibly Caused by Contractor Workers.Line Repaired
- 05000155/LER-1980-005, Forwards LER 80-005/03L-0
- 05000155/LER-1980-005-03, /03L-0:on 800301,following Several Intermittent Automatic Test Circuit Alarms,Sensor Channel D of Reactor Depressurizing Sys Removed from Svc.Caused by Setpoint Drift on Transmitter LT-3183.Transmitter Vented & Returned to S
- 05000155/LER-1980-006-03, /03L-0:on 800403,following Intermittent Automatic Test Circuit Alarms,Sensor Channel D of Reactor Depressurizing Sys Was Removed from Svc to Correct Problem. Caused by Setpoint Drift.Unit Was Readjusted
- 05000155/LER-1980-007, Forwards LER 80-007/03L-0
- 05000155/LER-1980-007-03, /03L-0:on 800224,during Routine Operation,Excess Vibration Was Noted on Control Rod Drive Pump 2.Caused by Worn Suction Poppet Valves on Pump & Damage to Pump Piping Hangers from Vibration.Valves Replaced & Hangars Repaired
- 05000155/LER-1980-008-03, /03L-0:on 800411,following Intermittent Automatic Test Circuit Alarms,Sensor Channel D of Reactor Depressurizing Sys Was Removed from Svc to Correct Problem. Caused by Drift.Unit Was Readjusted
- 05000155/LER-1980-009, Forwards LER 80-009/03L-0
- 05000155/LER-1980-009-03, /03L-0:on 800415,6-month Leakage Tests for Equipment & Personnel Locks to Containment Bldg Completed 5 Days Later than Tech Specs Require.Caused by Incorrectly Logged Surveillance Test Status Board Info
- 05000155/LER-1980-010-03, /03L-0:on 800423,intermittent Automatic Test Circuit Alarmed.Caused by Setpoint Drift in Conservative Direction on Reactor Level Transmitter.Unit Readjusted by Venting & Rezeroing Transmitter
- 05000155/LER-1980-011, Forwards LER 80-011/03L-0
- 05000155/LER-1980-011-03, /03L-0:on 800501,during Monthly Gravity Checks, Cell 2 of Battery for Channel a of Reactor Depressurizing Sys Read Below Tech Specs.Cell Did Not Respond Adequately to Equalizing Charge.Cause of Failure Unknown.Cell Replaced
- 05000155/LER-1980-012-03, /03L-0:on 800507,intermittent Automatic Test Circuit Alarmed.Caused by Setpoint Drift in Conservative Direction on Reactor Level Transmitter.Unit Readjusted by Venting & Rezeroing Transmitter
- 05000155/LER-1980-013, Forwards LER 80-013/01T-0
- 05000155/LER-1980-013-01, /01T-0:on 800509,design Review Indicated That Damage to Air Operator Mechanism Might Occur During Pressure Transient Associated W/Mca in Final Hazards Summary Rept.Caused by Inadequate Specs for Original Valves
- 05000155/LER-1980-014-03, /03L-0:on 800512,sensor Channel D of Reactor Depressurizing Sys Was Removed from Svc to Correct Problem Following Intermittent Automatic Test Circuit Alarms.Caused by Setpoint Drift.Unit Readjusted
- 05000155/LER-1980-015-03, /03L-0:on 800515,sensor Channel D of Reactor Depressurizing Sys Was Removed from Svc to Correct Problem Following Intermittent Automatic Test Circuit Alarms.Caused by Setpoint Drift.Unit Readjusted
- 05000155/LER-1980-016-03, /03L-0:on 800527,sensor Channel D of Reactor Depressurizing Sys Was Removed from Svc to Correct Problem Following Intermittent Automatic Test Circuit Alarms.Caused by Setpoint Drfit.Unit Readjusted
- 05000155/LER-1980-017, Forwards LER 80-017/03L-0
- 05000155/LER-1980-017-03, /03L-0:on 800703,following Intermittent Automatic Test Circuit Alarms,Setpoint Drift in Conservative Direction Found on Reactor Level Transmitter.Cause to Be Investigated. Readjusted Unit by Venting & Rezeroing Transmitter
- 05000155/LER-1980-018, Forwards LER 80-018/03L-0
- 05000155/LER-1980-018-03, /03L-0:on 800710,during Gravity Check,Cells 35 & 54 of Battery Power Supply for Reactor Depressurizing Sys Channel C Found Below Tech Spec Values.Cause Unknown.Cells Failed to Respond to Charge & Channel Removed from Svc
- 05000155/LER-1980-019, Forwards LER 80-019/03L-0
- 05000155/LER-1980-019-03, /03L-0:on 800713,visual Alarm Noted on Containment Pressure Indicator on Unit Pis 173 in Control Room.Cause Not Repetitive.Investigation Revealed Defective Electronic Components in Unit
- 05000155/LER-1980-020, Forwards LER 80-020/03L-0
- 05000155/LER-1980-020-03, /03L-0:on 800718,during Weekly Checks of Pilot Cell of Reactor Depressurizing Sys Battery for Channel C, Voltage Anomaly Revealed Defective Three Unit Cell.Caused by Increase in Internal Resistance of Cell Unit 9
- 05000155/LER-1980-021, Forwards LER 80-021/03L-0
- 05000155/LER-1980-021-03, /03L-0:on 800729,following Intermittent Automatic Test Circuit Alarms,Sensor Channel D of Reactor Depressurizing Sys Was Removed from Svc to Vent Level Transmitter LT3183.Caused by Minor Calibr Shift
- 05000155/LER-1980-022, Forwards LER 80-022/03L-0
- 05000155/LER-1980-022-03, /03L-0:on 800807,during Monthly Specific Gravity Checks,Cells 38,39 & 56 of Reactor Depressurizing Battery for Channel C Had Low Readings.Cause Not Known.Cell Units 13 & 19 Replaced.Channel C Restored on 800813
- 05000155/LER-1980-023, Forwards LER 80-023/01T-0
- 05000155/LER-1980-023-01, /01T-0:on 800812,review of Reactor Containment Design for Steam Line Breaks in Primary Sys Indicated That Containment Atmosphere Temp Can Exceed Temp Criteria Previously Used.Operating Instructions Revised
- 05000155/LER-1980-024-03, /03L-0:on 800814,after Periodic Automatic Test Circuit Alarms,Reactor Depressurizing Sys Sensor Channel D Was Removed from Svc to Vent Reactor Water Level Transmitter LT3183.Caused by Minor Calibr Shift in Transmitter
- 05000155/LER-1980-025-03, /03L-0:on 800819,after Periodic Automatic Test Circuit Alarms,Reactor Depressurizing Sys Sensor Channel D Was Removed from Svc to Vent Reactor Water Level Transmitter LT3183.Caused by Minor Calibr Shift in Transmitter
- 05000155/LER-1980-026-03, /03L-0:on 800820,after Periodic Automatic Test Circuit Alarms, Reactor Depressurizing Sys Sensor Channel D Was Removed from Svc to Vent Reactor Water Level Transmitter LT3183.Caused by Minor Calibr Shift in Transmitter
- 05000155/LER-1980-027-03, /03L-0:on 800814,after Periodicautomatic Test Circuit Alarms,Reactor Depressurizing Sys Sensor Channel D Was Removed from Svc to Vent Reactor Water Level Transmitter LT3183.Caused by Minor Calibr Shift in Transmitter
- 05000155/LER-1980-028-03, /03L-0:on 800909,following Automatic Test Circuit Alarms,Sensor Channel D Removed from Svc to Vent Reactor Water Level Transmitter LT3183.Tech Spec Change Request Submitted 800825 to Provide Greater Margin in Trip Setpoint
- 05000155/LER-1980-029-03, /03L-0:on 800911,during Monthly Gravity Checks, Cell 12 of Reactor Depressurizing Battery for Channel D Had Low Reading of 1.171.Cause Unknown.Cell Replaced 800917
- 05000155/LER-1980-030, Forwards LER 80-030/03L-0
- 05000155/LER-1980-030-03, /03L-0:on 800919,minor Seat Leakage Discovered in Containment Isolation Valve CV4027.Caused Not Determined. Valve Seat Scheduled for Replacement Due to Previous Indication of Wear
- 05000155/LER-1980-031, Forwards LER 80-031/03L-0
- 05000155/LER-1980-031-03, /03L-0:on 800923,reactor Level Transmitter LT3183 on Reactor Depressurization Sys Was Returned to Svc W/Trip Setpoint Lower than Required.Caused by Equipment Defect. Revised Setpoints Implemented
- 05000155/LER-1980-032-03, /03L-0:on 800917,following Intermittent Automatic Test Circuit Alarms,Sensor Channel D of Reactor Depressurizing Sys Was Removed to Vent Reactor Water Level Transmitter LT3183.Caused by Conservative Calibr Shift
- 05000155/LER-1980-033-01, /01T-0:on 801003,investigation of 800927 Minor Leak in Reactor Cleanup Demineralizer Sys Established Event Reportability.Caused by Bearing Failure of Canned Rotor Pump
- 05000155/LER-1980-034, Forwards LER 80-034/01T-0
- 05000155/LER-1980-034-01, /01T-0:on 801101,during Routine Shutdown Operations,Main Steam Isolation Valve M07050 Failed to Close on Remote Manual Initiation.Caused by Hardened Packing Matl on Valve Stem.Other Packing Techniques Are Being Considered
- 05000155/LER-1980-035, Forwards Updated LER 80-035/03X-1
- 05000155/LER-1980-035-03, /03X-1:on 801024,during Transfer of Resins from Anion Tank to Reactor Cleanup Demineralizer,Water Leaked from Tank.Caused by Crack in External Lead Shield on Tank. Item Is Not Reportable Based on Tech Specs
- 05000155/LER-1980-036-03, /03L-0:on 801118,output Voltage Did Not Reach Normal 480-volt Level.Probably Caused by Damage to Two Diodes (Type IN-1190) During Annual Maint Checks.Diodes Replaced & Annual Checks Eliminated
- 05000155/LER-1980-037-03, /03L-0:on 801118,engine Cooling Water Pump Coupling Components Overheated.Caused by Coupling Sleeve Wearing on Bearing Seal of Reduction Gear Unit Due to Loose Set Screw.Unit Repaired
- 05000155/LER-1980-038-03, /03L-0:on 801118,10-inch Feedwater Check Valve Vfw 304 Exhibited Leakage.Caused by Dirt & Scale on Valve Seat & Disc.Disc Machined & Seat Lapped.Valve Tested
- 05000155/LER-1980-039, Forwards LER 80-039/03L-0
- 05000155/LER-1980-039-03, /03L-0:on 801127,check Valve Inside Containment in 3-inch Treated Waste Line Found Leaking in Excess of Test Criteria.Caused by Excessive Wear on Disc Pin of Tilting Disc Check Valve.Seat & Disc Components Replaced
- 05000155/LER-1980-040, Forwards LER 80-040/03L-0
- 05000155/LER-1980-040-03, /03L-0:on 801202,diesel Fire Pump Unit Did Not Produce Full Discharge Pressure Output Until After Starting Time Acceptance Criteria.Cause Undetermined.Engine Jacket Heater Thermostat Control Setting Increased
- 05000155/LER-1980-041, Forwards LER 80-041/03L-0
- 05000155/LER-1980-041-03, /03L-0:on 801123,during Containment Type C Component Leak Rate Tests,Reactor Cleanup Sys Resin Sluice Valves CV4092 & CV4093 Exhibited Excessive Leakage.Caused by Minor Wear on Seat of Each Valve.Ball Disc & Seats Replaced
- 05000155/LER-1980-042, Forwards LER 80-042/01T-0
- 05000155/LER-1980-042-01, /01T-0:on 801206,wall Leakage Observed During Inservice Insp Activity at Weld in two-inch Pipe in Excess Flow Return from Control Rod Drive Sys.Probable Cause Related to Marginal Const.Repairs Will Be Made
- 05000155/LER-1980-043, Forwards LER 80-043/01T-0
- 05000155/LER-1980-043-01, /01T-0:on 801212,crack Measuring 1/2-inch Found in Base Metal of 3-inch Line at 1/2-inch Branch Connection. Probably Caused by Stress Corrosion.Defective Parts Replaced
- 05000155/LER-1980-044, Forwards Updated LER 80-044/03X-1
- 05000155/LER-1980-044-03, Output Voltage Regulator Failed & Circuit Breakers to Personnel & Equipment Locks & Lighting Transformer Tripped.Caused by Open Connection to Excitation Buildup Relay Coil Due to Aging & Vibration
- 05000155/LER-1980-045, Forwards LER 80-045/03L-0
- 05000155/LER-1980-045-03, /03L-0:on 801210,check Valve Vrd 310 in Common Control Rod Drive 2-inch Suction Line Leaked in Excess of Acceptable Criteria.Caused by Slight Imperfections in Valve Disc Due to Fabrication Flaws
- 05000155/LER-1980-046, Forwards LER 80-046/03L-0
- 05000155/LER-1980-046-03, /03L-0:on 801211,during Specfic Gravity checks,21 of 60 Cell Batteries for Reactor Depressurizing Channel a Found Below Required Specific Gravity.Caused by Inadequate Cleaning & Reconnecting of Cell Terminals
- 05000155/LER-1980-047, Forwards LER 80-047/03L-0
- 05000155/LER-1980-047-03, /03L-0:on 801217,generator Output Voltage Failed to Build Up During Test Start of Emergency Diesel Generator. Caused by Broken Pins in plug-in Socket of Relay Socket in Regulation Board.Stronger Socket Installed
- 05000155/LER-1980-048, Forwards LER 80-048/01T-0
- 05000155/LER-1980-048-01, /01T-0:on 801219,150 Splices & Five Terminal Block Defects Were Found.Caused by Installation of Faulty Equipment in Original Const.Splices & Blocks Repaired or Replaced
- 05000155/LER-1980-049, Forwards LER 80-049/03L-0
- 05000155/LER-1980-049-03, /03L-0:on 801230,during Routine Calibr of Containment Bldg Level,Transmitter Indicated 587 1/2 Ft Level W/Actual Level 590 Ft.Cause of Deficiency in Barton Model 386 Transmitter Not Determined.Transmitter Recalibr
- 05000155/LER-1980-050, Forwards LER 80-050/03L-0
- 05000155/LER-1980-050-03, /03L-0:on 801223,monthly Tests for Dc Batteries Found Overdue.Caused by Inadequate Administrative Controls & Personnel Error.Maint Dept Daily Working Schedule Form Revised to Include Surveillance of Test Status Board
- 05000155/LER-1981-001, Forwards LER 81-001/03L-0
- 05000155/LER-1981-001-03, /03L-0:on 810102,during Specific Gravity Checks, Cell 56 of Reactor Depressurizing Sys Battery for Channel D Had Reading Below 1.200 & Failed to Respond Adequately to Equalizing Charge.Cause Not Known.Cell Replaced on 810108
- 05000155/LER-1981-002, Forwards LER 81-002/01T-0
- 05000155/LER-1981-002-01, /01T-0:on 810112,discovered Potential for Overpressurization of Control Rod Drive Water Supply Sys Suction Line Piping.Caused by Addition of Check Valve VRD-310.Design Changes Will Be Made
- 05000155/LER-1981-003, Forwards LER 81-003/03L-0
- 05000155/LER-1981-003-03, /03L-0:on 810128,backup Nitrogen Bottle Supply for Containment Vacuum Relief Valve Control Sys Depressurized. Caused by Fractured Bottle Isolation Valve Body Probably Due to Overtightening Bonnet Mounting Nut.Valve Replaced
- 05000155/LER-1981-004, Forwards LER 81-004/03L-0
- 05000155/LER-1981-004-03, /03L-0:on 810315,leak in Chemical Waste Receiver Tank Discharge Pipe Observed.Cause Possibly Due to long-term Corrosion in Elbow of 3-inch Pipe.Elbow & Short Sections of Piping Replaced
- 05000155/LER-1981-005, Forwards LER 81-005/03L-0
- 05000155/LER-1981-005-03, /03L-0:on 810321,emergency Diesel Generator Starting Time Did Not Meet Criteria.Cause Unknown.Tech Spec Mod Requested on 800205 to Allow Relaxation of Time
- 05000155/LER-1981-006, Forwards LER 81-006/03L-0
- 05000155/LER-1981-006-03, /03L-0:on 810407,control Unit Indicator for One of Two Reactor Containment Vacuum Relief Loops Presented Inadequate Pressure Display.Caused by Removal of Control Unit Pis 187 for Maint Due to Defective Neon Lamp Element
- 05000155/LER-1981-007, Forwards LER 81-007/03L-0
- 05000155/LER-1981-007-03, /03L-0:on 810414,starting Time for Emergency Diesel Generator Did Not Meet Procedure Criteria.Cause Undetermined.Subsequent Testing Was Satisfactory
- 05000155/LER-1981-008, Forwards LER 81-008/03L-0
- 05000155/LER-1981-008-03, /03L-0:on 810420,starting Time for Emergency Diesel Generator Exceeded Procedure Criteria.Caused by Five of Six Injectors Not Producing Fine Spray Pattern.Injectors Replaced
- 05000155/LER-1981-009, Forwards LER 81-009/03L-0
- 05000155/LER-1981-009-03, /03L-0:on 810507,during Power Operations,Alarm Indicated Abnormal Temp on Reactor Vessel Level Sensing Chambers.Caused by Failed Capacitor in Temp Control Circuitry of Temp Switch Unit.Capacitor Replaced
- 05000155/LER-1981-010, Forwards LER 81-010/03L-0
- 05000155/LER-1981-010-03, /03L-0:on 810516,check Valve CV4094 Closing Time Exceeded Tech Specs Limit.Cause Unknown.Investigation Will Be Made During Future Outage.Valve Operating Cylinder & External Linkage Hinge Points Lubricated & Retested
- 05000155/LER-1981-011-03, /03L-0:on 810612,vacuum Relief Capability for Containment Bldg Exhaust Loop Was Inoperable on 810612,16 & 18.Cause Not Stated
- 05000155/LER-1981-012-03, /03L-0:on 810615,special Timing Test Revealed Closure Time of Valve CV4095 to Be Between 8 & 11-s,above Tech Spec Limit of 6-s.Exact Cause Not Determined.Valves Replaced W/Valves Having Increased Exhaust Capability
- 05000155/LER-1981-013, Forwards LER 81-013/03L-0
- 05000155/LER-1981-013-03, /03L-0:on 810617,reactor Depressurization Sys Loop B Was Removed from Svc to Check Inverter Power Supply.Caused by Defective Electronic Components in non-essential Synchronizing Circuit.Components Will Be Replaced
- 05000155/LER-1981-014, Forwards LER 81-014/03L-0
- 05000155/LER-1981-014-03, /03L-0:on 810728,both Emergency Condenser Radiation Monitors Were Removed from Svc During Repairs to Power Supply Component.Caused by Possibility of Shock & Fire Hazard.Monitors Returned to Svc within 15 Minutes
- 05000155/LER-1981-015, Forwards LER 81-015/03L-0
- 05000155/LER-1981-015-03, /03L-0:on 810813,pressure Sensor for Automatic Start of Diesel on Low Fire Sys Header Pressure Found Inadvertently Valved Closed for Excessive Period.Caused by Operator Error.Valve Restored & Procedures re-emphasized
- 05000155/LER-1981-016, Forwards LER 81-016/01T-0
- 05000155/LER-1981-016-01, /01T-0:on 810813,discovered That Actions to Mitigate Potential for Pressurization of Reactor Containment from Instrument & Svc Air Sources Not Incorporated Into Plant Procedures
- 05000155/LER-1981-017, Forwards LER 81-017/03L-0
- 05000155/LER-1981-017-03, /03L-0:on 810815,pilot Cell of Channel a Battery Supply for Reactor Depressurizing Sys Found to Have Electrolyte Level Above High Level Mark.Probably Caused by Inadvertent Overfilling of Cell.Electrolyte Level Reduced
- 05000155/LER-1981-018, Forwards LER 81-018/03L-0
- 05000155/LER-1981-018-03, /03L-0:on 810822,leaking Solenoid Valve Discovered in Twin Offgas Monitors Used to Supply Purging Air to Sys. Caused by Worn Parts in Asco(Model 8320A88) three-way Solenoid Valve.Parts Replaced & Periodic Maint Scheduled