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ML19324C1758 November 1989LER 89-012-01:on 890309,diaphragm Leak Found in Pressure Differential Switch 1E31-N013BB.Caused by Tear Found in Diaphragm.Replacement Switch Installed,Calibr & Functionally Tested satisfactorily.W/891108 Ltr
ML19325F34113 November 1989LER 89-024-00:on 891013 & 30,unsealed Openings in Main Control Room Floor & Main Control Room West Wall Discovered. Caused by Wide Gap Between Structural Beam & Cable Tray. Openings Sealed & Fire Watch established.W/891113 LtrFire Barrier
Fire Watch
Hourly Fire Watch
ML19327C26017 November 1989LER 89-014-00:on 891020,primary Containment Isolation Sys Group 4 Isolation Occurred Causing Isolation Dampers to Close.Caused by Opening of Div 2 125-volt Dc Breaker.Power Supply replaced.W/891117 LtrEmergency Lighting
ML19332D51822 November 1989LER 89-018-01:on 890515,RCIC Received Div I & Div II Isolation on RCIC High Steam Line Flow.Caused by Spurious High Steam Flow Signal When Steam Added to RCIC Steam Line. Special Test Initiated.Isolation Logic reset.W/891122 Ltr
ML19332E65829 November 1989LER 89-015-00:on 891030,shift Control Room Engineer Noted That Quarterly Standby Liquid Control Operating Surveillance LOS-SC-Q1 Was Past Critical Date.Caused by Clerical Data Entry Error.Missed Surveillance performed.W/891129 LtrMissed surveillance
ML19332F0088 December 1989LER 89-016-00:on 891109,RWCU Isolation Occurred While Instrument Surveillance on Ventilation Differential Temp Isolation Functional Test in Progress.Caused by Faulty Thermocouple.Thermocouple repaired.W/891208 Ltr
ML19332F2431 December 1989LER 89-025-00:on 891101,sys Auxiliary Transformer Feed to Bus 142Y Tripped Open When Equipment Operator Closed Door Containing Relays.Caused by Misalignment of Door.Isolations Reset,Bus Energized & Circuit Logic tested.W/891201 Ltr
ML19351A63015 December 1989LER 89-006-01:on 890214,reactor Vessel Low Water Level 3 Switch Setpoint Found Out of Tolerance.Caused by Setpoint Drift.Level Switch to Be Replaced by Analog Trip Sys During First Quarter 1990.W/891215 LtrReactor Vessel Water Level
ML19351A67512 December 1989LER 89-027-00:on 891113,primary Containment Isolation Sys Group I Isolation Occurred While Performing Instrument Surveillance.Caused by Loss of Power to Leak Detection Sys Logic.Isolation reset.W/891213 LtrReactor Vessel Water Level
ML19354D83615 January 1990LER 89-018-00:on 891216,plant 250-volt Battery & RCIC Sys Declared Inoperable Due to Low Battery Electrolyte Temps. Caused by Failure of Div I Switchgear Heat Removal Sys Damper Actuators.Air Intake Dampers closed.W/900115 Ltr
ML20005D6626 December 1989LER 89-026-00:on 891106,inadvertent Primary Containment Isolation Actuation Occurred While Clearing out-of-svc. Caused by Inadequate Logic Setup During Mod Installation. Trip Status & Output Switches repositioned.W/891206 Ltr
ML20005E27422 December 1989LER 89-028-00:on 891204,RHR Shutdown Cooling Suction Header Outboard Isolation Valve Automatically Isolated.Caused by Miscommunication Between Technician & Station Operator.Task Force Developed to Review event.W/891222 LtrHigh Radiation Area
Missed surveillance
ML20006E39514 February 1990LER 89-010-01:on 890303,automatic Depressurization Sys Permissive Switch Found W/Setpoint in Excess of Reject Limit.Caused by Setpoint Drift.All Static-O-Ring Reactor Vessel Level Switches Will Be replaced.W/900214 Ltr
ML20006E39814 February 1990LER 89-008-01:on 890228,reactor Vessel Low Water Level 2 Switch Found W/Setpoint in Excess of Reject Limit.Caused by Setpoint Drift.Channel Placed in Tripped Condition & All Static-O-Ring Pressure Switches to Be replaced.W/900214 Ltr
ML20006E44514 February 1990LER 89-009-01:on 890619,diaphragm Leak Discovered in RCIC Steam Line High Flow Isolation Switch.Caused by 1 & 1/2-inch Tear in Diaphragm.Pressure Differential Switch Replaced & Calibr.Reported Per NRC Bulletin 86-002.W/900214 Ltr
ML20006E45015 February 1990LER 89-010-01:on 890715 & 17,voltage Oscillations Noted on Div II Battery Charger,Resulting in Inoperability of HPCS Sys.Caused by Failure of Charger in High Voltage Shutdown Relay.Charger Energized & Relay replaced.W/900215 Ltr
ML20006F59521 February 1990LER 90-001-00:on 900122,RWCU Sys Received Div 1 Leakage Detection Ambient Temp High Isolation Signal,Causing Trips of RWCU Pumps a & C.Caused by Broken Thermocouple Input Lead.Lead Wire Reconnected & Isolation reset.W/900221 Ltr
ML20011D13414 December 1989LER 89-017-00:on 891117,flow Switch FS-2E22-N006 Found W/ Setpoint Out of Tolerance Above Reject Limit.Caused by Setpoint Drift.Work Request Written to Replace Flow Switch. W/891214 Ltr
ML20011F49216 February 1990LER 89-013-01:on 890907,Group I Isolation Received During Performance of Instrument Surveillance LIS-MS-401.Caused by Depressurization of Main Steam Line Low Pressure Switch. Surveillance Revised to Split Into Two parts.W/900216 Ltr
ML20011F55528 February 1990LER 90-002-00:on 900129,after Filling Diesel Generator 1A Governor W/Oil,Generator Started & Declared Inoperable. Caused by Slow Leak Coming from Compensation Needle Valve Plug.Oil Added & Plug Washer replaced.W/900228 Ltr
ML20011F8252 March 1990LER 90-003-00:on 900201,RCIC Received Div 2 Isolation on RCIC High Steam Line Flow.Caused by Spurious High Steam Flow Signal Generated When Steam/Water Mixture Admitted to RCIC Steam Line.Isolation Logic reset.W/900302 Ltr
ML20012B5528 March 1990LER 90-001-00:on 900206,full Reactor Scram Occurred During Instrument Surveillance Testing.Caused by Actuation of APRM E Trip Circuitry.Shutdown Margin Revised & Caution Card Placed on Control Room Bench board.W/900308 LtrShutdown Margin
Half scram
ML20012B6509 March 1990LER 90-002-00:on 900209,Operating Surveillance LOS-TG-W1 Determined to Have Exceeded Required Testing Interval,Per Tech Spec 3/4.7.10.Caused by Personnel Error.Personnel Counseled & Ref Procedures Will Be revised.W/900309 LtrSafe Shutdown
Missed surveillance
Grace period
ML20012C49315 March 1990LER 90-004-00:on 900213,control Room B HVAC Intake Radiation Monitor Lost Power Causing auto-start of Emergency make-up Train B.Caused by Blown Fuses.Fuses Replaced.Logic Revs for Radiation Monitors Will Be installed.W/900315 Ltr
ML20012D53416 March 1990LER 90-003-01:on 900201,RCIC Isolation Signal Occurred During Warmup.Caused by Spurious High Steam Flow Signal.Rcic Sys Piping Integrity Verified & Isolation Logic Reset.W/ 900316 Ltr
ML20012D53716 March 1990LER 90-002-01:on 900129,oil in Diesel Generator Governor 1A Found to Be Low & Could Not Be Seen in Sight Glass.Caused by Slow Leak from Compensation Needle Valve Plug.Proper Amount of Oil Added & Operability Test performed.W/900316 Ltr
ML20023A7548 October 1982LER 82-109/03L-0:on 820925,pressure Switches 1E31-N022C & 1E31-N022D Found Out of Tolerance in Nonconservative Direction During Reactor Low Pressure RCIC Isolation Calibr & Functional Test.Caused by Setpoint Drift
ML20023B21113 December 1982LER 82-152/03L-0:on 821115,during Performance of LIS-RI-01, Differential Pressure Indicating Switch 1E31-N007A Setpoint Found Out of Tolerance in Nonconservative Direction Per Tech Spec 3.3.2.Cause Unknown.Switch Recalibr
ML20023B26515 December 1982LER 82-151/03L-0:on 821117,emergency Makeup Control Room Ventilation Fan B Failed to Start.Caused by Bent Outlet Damper Shaft to B Train & Broken Bearing Housing Cap. Linkage Misaligned When Installed Initially.Damper Repaired
ML20023B80528 April 1983LER 83-033/03L-0:on 830402,during Hot Shutdown,Radwaste Effluent Monitor Declared Inoperable.Caused by High Fixed Level of Background Radiation.Liquid Radwaste PRM Inner Chamber Coated W/Acrylic Resin to Prevent Radiation Buildup
ML20023C4933 May 1983LER 83-034/03L-0:on 830408,during LIS-HP-10,level Indicating Switch 1B21-N100A as-found Setpoint Exceeded Tech Spec Value.Caused by Setpoint Drift.Switch Setpoint RecalibrReactor Vessel Water Level
ML20023C5064 May 1983LER 83-035/03L-0:on 830406,offgas Hydrogen Analyzer 1A Not Maintaining Proper Vacuum & Analyzer 1B Not Wired Properly. Caused by Dirty Flame Arrestor on Analyzer A.Flame Arrestor Cleaned.Analyzer B RewiredGrab sample
ML20023D96526 May 1983LER 83-043/03L-0:on 830427,while Performing Charger Capacity Test,Div 1 Charger SCR Output Fuse F-1 Blew & Charger Feed Breaker Tripped Shutting Down Charger.Caused by Problem W/ Battery Capacity Tester.Fuse replaced.W/830526 Ltr
ML20024A6549 June 1983LER 83-050/03L-0:on 830518,administrative/clerical Errors Found in Table 3.7.9-2.Caused by Personnel Inability to Transpose Design Info Into Tech Spec Table.Discrepancies corrected.W/830609 Ltr
ML20024A69614 June 1983LER 83-051/03L-0:on 830516,reactor Protection Sys Trip Channel H2 Limit Switch Failed to Operate Properly.Cause Unknown.Limit Switch readjusted.W/830614 Ltr
ML20024B07216 June 1983Updated LER 83-012/03X-1:on 830210,w/reactor in Cold Shutdown,Setpoints for Switches 1E31-N612A/B Found Above Tech Spec Limits.Cause Unknown.Switches calibr.W/830616 Ltr
ML20024B8385 July 1983LER 83-060/03L-0:on 830606,following Turbine Trip & Scram Due to High Vibration on Main Turbine,Reactor Recirculation Breaker 4B Closed.Cause Undetermined.Auxiliary Contacts cleaned.W/830705 Ltr
ML20024E91226 August 1983LER 83-093/03L-0:on 830801,discovered full-in Indication on Core Display for Control Rod 34-47 Inoperable.Caused by Failed Switching Transistor on Data Memory Board 19.Data Memory Board replaced.W/830826 Ltr
ML20024G97710 May 1991LER 91-005-00:on 910410,determined That Tech Spec Required Surveillance of Suppression Chamber Oxygen Sampling Missed. Caused by Inadequate Review of Tech Spec Change.Drywell & Suppression Chamber Checked for oxygen.W/910510 LtrMissed surveillance
ML20027A9913 September 1982LER 82-090/03L-0:on 820820,mechanical Snubber M514-1056S Found Damaged.Caused by Application of Excessive Forces in Lateral Direction Causing Snubber to Bend &/Or Twist.Snubber Replaced
ML20027B1925 August 1982LER 82-065/01T-0:on 820722,util Notified Region 3 & NRR of Potential 10CFR50.55e Assessment Involving post-LOCA Chugging Phenomena W/Suppression Chamber to Drywell Vacuum Breakers.Written Response Will Be Issued
ML20027B27313 September 1982LER 82-089/03L-0:on 820815,reactor Core Isolation Cooling Turbine Tripped on Overspeed During STP 14,Step 10.2.F Vessel Injection Cold Quick Start Test.Caused by Turbine Governor Valve Binding Due to Problem in Mechanical Section
ML20028A0928 November 1982LER 82-119/03L-0:on 821010,while in Mode 2,OB Vaporizer Concentrate Train Could Not Maintain Required 0.125-inch Water Positive Pressure Relative to Adjacent Areas.Caused by Loose Louver Blade Blocking Ductwork.Blade Repaired
ML20028A85719 November 1982LER 82-135/03L-0:on 821021,div 1 ID18-N009B Reactor Bldg Ventilation Process Radiation Monitor Drifted High.Caused by Failed Geiger-Muller Tube Mfg by Lnd.Tube Replaced
ML20028B07519 October 1982LER 82-136/03L-0:on 821022,during Performance of LTS-100-15, Primary Containment Personnel Access Hatch Leak Rate Test, Both Doors Inadvertently Opened.Caused by Door Rebounding Past Hatch.Interior Door Closed Restoring Integrity
ML20028B15915 November 1982LER 82-129/03L-0:on 821018,condensate Leak Discovered in Heater Bay Between Heaters 13c & 14c.Caused by Crack in Socket Weld of High Vent 1CB027C.Valve Cut Out & Replaced
ML20028B29215 November 1982LER 82-130/03L-0:on 821019,leak Discovered in Socket Weld of Mechanical Seal Injection Line Valve for Condensate/ Condensate Booster Pump 1A.Caused by Cracked Weld Due to Vibrational Stress.Injection Line Replaced
ML20028C13721 December 1982LER 82-166/03L-0:on 821126,drywell CAM Sample Pumps 1PL15J & 1PL75J Continuously Tripped Off.Caused by Combination of Leaking cross-tie Valve & Internal Electronic Interference. Valve Will Be Replaced & Procedures Revised
ML20028C15430 December 1982LER 82-169/03L-0:on 821201,suppression Pool Narrow Range Sightglass Isolation Valves 1CM039-1CM045 Found Locked Open. Caused by Communication Breakdown Between Unit Nso & Equipment Attendant.Valves Realigned
ML20028C18130 December 1982LER 82-167/03L-0:on 821201,drywell Oxygen Monitoring Sys Failure Alarm Sounded in Control Room.Caused by Low Calibr Gas Bottle Pressure,Faulty Analyzing Cell & Defective Flow Regulator.Calibr Gas Bottle & Faulty Parts Replaced
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