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 Issue dateTitleTopic
ML18005A24914 January 1988LER 87-067-00:on 871214,containment Ventilation Isolation Occurred Due to High Radiation Alarm While Grab Sampling at Monitor REM-1LT-3502A-SA.Caused by Personnel Error & Eletronic Signal Spike.Sample Line labeled.W/880114 LtrGrab sample
ML18005A25018 January 1988LER 87-064-00:on 871102 & 1218,waste Processing Bldg Vent Stack 5A Wide Range Gas Monitor 1WV-3547-1 Declared Inoperable W/O Required Special Rept Submitted.Caused by Personnel Error.Procedure OMM-003 revised.W/880118 Ltr
ML18005A29518 February 1988LER 88-002-00:on 880119,vent Stack wide-range Gas Monitor RM #1WV-3547-1 Declared Inoperable Under Tech Spec 3.3.3.11, Due to Missed Maint Surveillance Test on 871227.Caused by Procedural Deficiency.Procedure revised.W/880218 LtrMissed surveillance
ML18005A29915 February 1988LER 88-001-00:on 880115,emergency Operating Procedure (EOP) Deficiency for Switchover to Recirculation After LOCA Discovered.Caused by Failure to Incorporate FSAR Change Into Plant Procedures.Eops revised.W/880215 LtrUnanalyzed Condition
Local Leak Rate Testing
ML18005A30522 February 1988LER 88-003-00:on 880121,peak Reactor Power of 103% Reached. Caused by Jumper Wire Installed in Train a of solid-state Protection Sys Cabinet.Extensive Wire Check Conducted for Addl Wiring Errors & Evaluation of safety.W/880222 Ltr
ML18005A30923 February 1988LER 87-059-01:on 871011,incoming Line Breaker Tripped, Initiating 1A-SA Safety Bus Blackout.Caused by Vibration in Relay Cabinets for Breaker.Switchyard Breaker 52-3 Reclosed & Offsite Power Restored to 1A-SA bus.W/880223 Ltr
ML18005A31224 February 1988LER 88-004-00:on 880125,resultant Level Indication Revealed That Actual Tank Level Was Less than That Required by Tech Spec 3.6.2.2.Caused by Air Trapped in Sensing Lines of Level Transmitters.Sensing Line vented.W/880224 Ltr
ML18005A31529 February 1988LER 88-005-00:on 880201,discovered That Two Valves for Turbine Bldg Vent Stack 3A Wide Range Gas Monitor Were Mispositioned.Caused by Procedural Deficiency.Valve Lineup for Monitor Skid corrected.W/880229 LtrGrab sample
ML18005A37318 March 1988LER 88-008-00:on 880217,emergency Svc Water Pump Started Then Tripped.Caused by Problem W/Overcurrent Relay. Overcurrent Relay Replaced & Emergency Safeguards Sequencer Sys Test Procedure revised.W/880318 Ltr
ML18005A37829 March 1988LER 88-001-01:on 880115,procedural Deficiency Which Could Have Resulted in Failure of ECCS During Recirculation Phase of Accident Identified.Caused by Failure to Note New Requirement in Procedure.Procedures revised.W/880329 LtrUnanalyzed Condition
Local Leak Rate Testing
ML18005A3888 April 1988LER 88-007-00:on 880309,several Alarms Received by Operators at Main Control Board Indicating Low Water Level in Steam Generator B.Caused by Failed Renewable Fuse.Fuse Replaced. W/880408 Ltr
ML18005A40215 April 1988LER 88-006-01:on 880208,both Emergency Svc Water Sys Declared Inoperable Due to Isolation Valve Failures.Caused by Debris Accumulation.Failed Valves Repaired & Retested. W/880415 Ltr
ML18005A43419 May 1988LER 88-009-00:on 880422,discovered That on 880419 Tech Spec 3.0.3 Violated.Caused by Train a Being Placed in Test While Train B Declared Inoperable for Maint & Testing Due to Personnel Error.Procedures Will Be revised.W/880519 LtrManual Operator Action
ML18005A45210 June 1988LER 88-011-00:on 880511,Westinghouse Notified Plant of Unanalyzed Condition Re Inadvertent Actuation of Low Temp Overpressure Protection Sys.Automatic Actuation Function Disabled & Permanent Mod Under consideration.W/880610 LtrSafe Shutdown
Unanalyzed Condition
ML18005A45410 June 1988LER 88-012-00:on 880512,emergency Svc Water (ESW) Sys Declared Inoperable & on 880513,attempt to Close Valves Failed Rendering Train a Inoperable.Cause of Valve Failure Unknown.Plant Change Request 2878 approved.W/880610 Ltr
ML18005A5328 August 1988LER 87-059-02:on 871011,incoming Line Breaker Tripped Initiating Safety Bus Blackout.Caused by Hammering & Drilling of in Relay Cabinet by Employee.Switchyard Breaker Reclosed & off-site Power Restored to bus.W/880808 Ltr
ML18005A56225 August 1988LER 88-017-00:on 880726,Tech Spec 3.7.7 Violated.Caused by Inoperability of Emergency Svc Water Pump a & Train a Essential Svcs Chilled Water Sys.Bay Inspected Under Water & Traveling Screen Operation W/Bay drained.W/880825 Ltr
ML18005A56629 August 1988LER 88-018-00:on 880730,main Feedwater Pump Tripped Due to Low Flow During Normal Shutdown for Scheduled Refueling Outage.Caused by Low Setpoint on Recirculation Flow Switch Drifting Out of Calibr Low.Switch calibrated.W/880829 Ltr
ML18005A56726 August 1988LER 88-019-00:on 880730,both source-range Nuclear Detectors NI-31 & NI-32 Failed Low & Declared Inoperable.Caused by Short in Inner Shield to Ctr Conductor & Faulty Cable connector.Source-range Detectors replaced.W/880826 LtrShutdown Margin
ML18005A5778 September 1988LER 88-021-00:on 880809,automatic Start of Auxiliary Feedwater Pump Occurred While Performing Operational Surveillance Test OST-1826.Caused by Procedural Deficiency. Procedures revised.W/880908 Ltr
ML18005A5816 September 1988LER 88-020-00:on 880806,wide Range Gas Monitor Inoperable Due to Loss of Sample Flow & Compensatory Actions Not Taken. Caused by Personnel Error.Procedure Revised for Addl Checks on Monitors & Personnel Received Addl training.W/880906 LtrGrab sample
ML18005A5828 September 1988LER 88-023-00:on 880812,control Operator Observed Midposition Indication on Control Board for Gagged Open Porv,Resulting in Tech Spec Noncompliance.Caused by Isolation of Nitrogen/Air Supply to actuator.W/880908 LtrSafe Shutdown
Time of Discovery
ML18005A5837 September 1988LER 88-022-00:on 880809,vent Stack Flow Rate Estimates Not Done Per Tech Specs.Caused by Personnel Error.Personnel Involved Counseled & on-shift Operators Reminded of Importance of Attention to detail.W/880907 Ltr
ML18005A58913 September 1988LER 88-023-01:on 880812,reactor Coolant Sys Vent Less than Required by Tech Spec 3.4.9.4 for Low Temp Overpressure Protection.Caused by Failed Valve Gagging Device.Longer Gagging Device installed.W/880913 LtrSafe Shutdown
Time of Discovery
ML18005A59213 September 1988LER 88-024-00:on 880812,maint Surveillance Tests Verifying Nuclear Instrumentation Source Range Monitor Operability Not Performed Prior to Mode 6 Entry.Caused by Deficient Planning & Scheduling.Surveillance Tests scheduled.W/880913 Ltr
ML18005A6376 October 1988LER 88-026-00:on 880831,cracking of Insulation on Wires & on Terminal Blocks in Top Works Portion of Valves Noted.On 880909 Concluded Valves Inside Containment Not Qualified for Harsh Environ Following Postulated accident.W/881006 Ltr
ML18005A64312 October 1988LER 88-029-00:on 880915,short Equipment Start Pulses Generated,Causing Safety injection,motor-driven Auxiliary Feedwater & Emergency Svc Water Pumps to Start.Caused by Failure of Relay in Sequencer Test circuit.W/881012 Ltr
ML18005A64810 October 1988LER 88-027-00:on 880907,chemistry Technicians Failed to Obtain Gas Grab Sample at Required Time.Specific Technician Designated to Perform Compensatory Sampling Until All Compensatory Surveillance Requirements met.W/881010 LtrGrab sample
ML18005A6987 November 1988LER 88-030-00:on 881008,steam Generator Pressure in turbine- Driven Auxiliary Feedwater Pump Steam Supply Heater Noted. Caused by Inadequate Shift Turnover During Valve Repair During Outage.Valve Seated properly.W/881107 LtrTime of Discovery
Anchor Darling
ML18005A70214 November 1988LER 88-028-00:on 881014,plant Tripped Due to Loss of Feedwater Caused by Low Condenser Hot Well Level.Caused by Low Level in Condenser Hot Well.Failed Relay Coil Replaced. W/881114 Ltr
ML18005A71428 November 1988LER 88-031-00:on 880614-21 & 0723-26,wide Range Gas Monitor Inoperable & Compensatory Actions Not Taken or Documented as Being Taken as Required Due to Personnel Error.Caused by Failure to Install EC4-X as required.W/881128 Ltr
ML18005A71729 November 1988LER 88-032-00:on 881030,manual Reactor Trip Upon Loss of Main Feedwater Occurred.Caused by Trip of Heater Drain Pumps Attributed to Plywood Cover Left Inside Feedwater Heater 3A Following Maint.Plywood Cover removed.W/881129 LtrPower change
ML18005A7474 January 1989LER 88-034-00:on 881205,fan Motor to Heating & Ventilation Equipment Room Found Not Electrically Connected to Power Supply.Caused by Inadequate Communications & Failure to Obey Procedures & Implement post-maint testing.W/890104 Ltr
ML18005A7523 January 1989LER 88-033-00:on 881125 & 1202,declared Charging Safety Injection Pump (Csip) Inoperable.Caused by 1C Csip Scantily Covered in ESF Response Surveillance Test Procedures.Test to Verify 1C Csip Response Time completed.W/890103 Ltr
ML18005A77915 February 1989LER 89-002-00:on 890117,water Inadvertently Drained from Spent Fuel Pool to New Fuel Pool.Caused by Incorrect Determination of Valves Position During Process of Removing Clearance.Spent Fuel Pool Level restored.W/890215 Ltr
ML18005A78015 February 1989LER 89-001-00:on 890116,while Restoring Direct Vent Path to Atmosphere,Turbine Load & Turbine Trip Occurred Due to Low Condenser Vacuum.Caused by Lack of Shift Foreman Clearance on Manual Valve.Personnel counseled.W/890215 Ltr
ML18005A8039 March 1989LER 89-004-00:on 890207,loss of All Three Circulating Water Pumps Resulted in Loss of All Flow to Main Condenser, Causing Reactor Trip.Caused by Air Entering Circulating Water Pump Seal Water Sys.Components repaired.W/890309 LtrTemporary Modification
ML18005A8098 March 1989LER 89-003-00:on 890206,shaft of Main Feedwater Pump a Sheared,Causing Sudden Reduction in Feedwater Flow to Steam Generators & Pump Trip.Caused by Corrosion in Shaft.Pump & Local Components repaired.W/890308 Ltr
ML18005A81315 March 1989LER 89-001-01:on 890116,plant Tripped Due to Low Condenser Vacuum Caused by Personnel Error on Valve Lineup.Shift Foreman Clearance Placed on Manual Valve & Repair to Motor Operated Valve completed.W/890315 Ltr
ML18005A81823 March 1989LER 89-001-02:on 890116,w/plant in Mode 1,reduction of Turbine Load Ensued & Turbine Trip Occurred Due to Low Condenser Vacuum Resulting in Automatic Reactor Trip.Caused by Personnel Error.Personnel counselled.W/890323 Ltr
ML18005A82522 March 1989LER 89-005-00:on 890222,reactor Trip on Low Steam Generator Level W/Steam/Feedwater Flow Mismatch Occurred During Calibr Test Procedure.Caused by Performance of Section of Procedure Intended to Be Conducted.Procedure revised.W/890321 Ltr
ML18005A84612 April 1989LER 89-006-00:on 890314,reactor Tripped on Low Level in Steam Generator a Approx 71 After Main Feedwater Pump B Tripped.Caused by Short in Motor Lead Allowing Water to Enter Junction Box.Missing Bolts replaced.W/890413 Ltr
ML18005A9078 May 1989LER 89-008-00:on 890410,deficiencies Discovered in Testing of Thermal Overload Bypass Circuit for motor-operated Valve. Caused by Procedural Inadequacies Which Resulted in Insufficient Testing of circuit.W/890508 LtrMissed surveillance
ML18005A93530 May 1989LER 89-009-00:on 890501,discovered That Monitoring for Radioactivity in Turbine Bldg Floor Drain Effluent Not Performed from 890429-30.Caused by Isolation of Sample Collection Path for Calibr of detector.W/890530 LtrGrab sample
ML18005A96226 June 1989LER 88-002-01:on 880119,vent Stack 5A Wide Range Gas Monitor Rm#1WV-3547-1 Declared Inoperable,Per Tech Spec 3.3.3.11. Caused by Maint Surveillance Test Not Being Completed as Scheduled.New Procedure initiated.W/890626 LtrMissed surveillance
ML18005A96729 June 1989LER 89-010-00:on 890529,Tech Specs Violation Occurred When Performing Incorrect Reactor Coolant Analysis.Caused by Personnel Error.Correct Analysis for Sample Completed. Technician Involved counseled.W/890629 LtrPower change
ML18005B00019 July 1989LER 89-011-00:on 890607,inaccurate Reading from Resistance Temp Detector (RTD) Used to Measure Thermocouple Ref Junction Box Temp Reported.Caused by Corrosion of RTD Terminal Contacts.Connection repaired.W/890719 Ltr
ML18005B00731 July 1989LER 89-012-00:on 890630,required Continuous Sampling of Release of Secondary Waste Sample Tank Not Performed.Caused by Personnel Error.Grab Sample of Secondary Waste Analyzed W/No Radioactivity Detected.Procedure revised.W/890731 LtrGrab sample
ML18005B05211 September 1989LER 89-013-00:on 890814,technician Inadvertently Jumpered Contacts Starting Emergency Svc Water Booster Pump B.Caused by Personnel Error.Testing Stopped & Personnel Counselled on Attention to Work activities.W/890911 Ltr
ML18005B05320 September 1989LER 89-014-00:on 890821,determined That Two Accessible Discharge Piping High Point Vents Not Verified Full of Water at Least Once Per 31 Days.Caused by Procedural Deficiency. Vents Verified Free of Air & Procedure revised.W/890920 Ltr
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