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 Issue dateTitleTopic
ML17303A99130 March 1988LER 88-004-00:on 880229,Mode 4 Entered W/Hpsi Injection Pumps Inoperable.Caused by Procedural Inadequacy.Procedure Revised to Include Steps to Ensure That HPSI Pumps Returned to Operable Status Prior to Entering Mode 4.W/880330 Ltr
ML17303B0047 April 1988LER 87-021-01:on 871202,post-accident Sampling Sys Declared Inoperable.Caused by Personnel Error.Appropriate Functional & Surveillance Tests Completed & Sys Decalred Operable.W/ 880407 Ltr
ML17303B06019 April 1988LER 88-006-00:on 880320,surveillance Interval for Incore Detector Sys Exceeded.Caused by Cognitive Personnel Error & Inadequate Programmatic Controls.Individual Involved Will Be Counseled &/Or Disciplined & Controls reviewed.W/880419 Ltr
ML17303B12716 May 1988LER 88-010-00:on 880415,discovered That Surveillance Test Interval Exceeded for Plant Vent Sys Monitors.Caused by Personnel Error.Surveillance Test Completed.Surveillance Test Terminology changed.W/880516 LtrPost Accident Monitoring
ML17303B16631 May 1988LER 88-002-01:on 880109,ASME Surveillance Interval Exceeded for Containment Isolation Valve.Caused by Personnel Error. Individual Will Receive Appropriate Counseling &/Or Disciplinary action.W/880531 LtrStroke time
ML17303B1693 June 1988LER 88-013-00:on 880325,essential Motor Driven Auxiliary Feedwater Pump Failed to Achieve Rated Pressure.Caused by Stress Corrosion Cracking/Hydrogen Embrittlement.Matl Changes Initiated.Part 21 related.W/880325 LtrNondestructive Examination
ML17304A1966 June 1988LER 88-015-00:on 880512,automatic Actuation of Reactor Protection Sys Occurred.Power Supply Found to Be Varying in Amplitude Intermittently Which Could Cause Varying Removal & Reinstatement of Buck & Boost voltage.W/880606 Ltr
ML17304A22622 June 1988LER 88-011-00:on 880522,decontamination Worker Received 2.607 Rem Whole Body Dose to Right Leg Resulting in Cumulative Whole Body Exposure for Quarter of 3.209 Rem. Caused by Incomplete decontamination.W/880622 LtrScaffolding
ML17304A24227 June 1988LER 88-010-01:on 880415,allowable Surveillance Test (ST) Interval for Plant Vent Sys Monitors (Pvsm) Exceeded.Caused by Personnel Error.Appropriate ST on Pvsm Completed & Terminology in ST 75ST-9ZZ07 changed.W/880627 LtrPost Accident Monitoring
ML17304A2497 July 1988LER 88-016-01:on 880514,reactor Trip Occurred as Control Element Assemblies Inserted Following Attempt to Start Up Reactor.Caused by Nonconservative Operator Performance During Startup.Logkeeping Practices improved.W/880707 LtrShutdown Margin
Anticipated operational occurrence
ML17304A28918 July 1988LER 88-012-00:on 880615,Channel D Linear Power Inoperable Due to Improper Landing of Leads to Plant Protection Sys Drawer.Caused by Personnel Error.Plant Protection Sys Channel D Linear Power Density tripped.W/880718 Ltr
ML17304A29625 July 1988LER 88-022-00:on 880319,bolting Which Secures Gasket Retainer Plate Fractured.Caused by Bolts Not Meeting Spec Requirements.Changes Being Implemented to Replace Matl.W/ 880725 Ltr
ML17304A3243 August 1988LER 88-018-00:on 880729,determined That Deficiencies W/ Potter & Brumfield Relays Constituted Reportable Condition Per 10CFR21.Relays Located in NSSS ESFAS Cabinets.Increased Relay Exercising Will Be implemented.W/880803 Ltr
ML17304A35915 August 1988LER 88-016-02:on 880514,reactor Trip Occurred.Caused by Nonconservative Operator Performance During Reactor Startup. Info Utilized for Estimated Critical Condition Will Be corrected.W/880815 LtrShutdown Margin
Anticipated operational occurrence
ML17304A40725 August 1988LER 88-006-00:on 880726,B Train Loss of Power ESF Actuation Occurred.Caused by Inadequate Plant Design & Installation of Temporary Ventilation Trunk.Ventilation Trunk Removed from Transformer Leads W/O incident.W/880825 LtrTemporary Modification
ML17304A56219 September 1988LER 88-021-00:on 880821,reactor Trip Occurred Due to High Pressurizer Pressure.Caused by Failure of Microswitch in Stator Coolant Flow Trip Circuit.Microswitch Replaced.W/ 880919 LtrSafe Shutdown
Temporary Modification
ML17304A62429 September 1988LER 88-017-01:on 880529,Trains a & B Essential Chillers Discovered Inoperable Due to Shut Root Isolation Valves for Transmitter.Caused by Personnel Errors While Affixing Warning Labels Near valves.W/880929 LtrUnanalyzed Condition
ML17304A63312 October 1988LER 88-005-00:on 880908,maint Dept Technician Reported Unauthorized Entry Into Locked High Radiation Area on 880912.Caused by Personnel Error.Technician Counseled, Disciplined & Provided W/Addl training.W/881012 LtrHigh Radiation Area
Locked High Radiation Area
ML17304A72131 October 1988LER 86-063-00:on 860920,discovered That Error in Radioactive Source Tracking Sys Resulted in Radioactive Sealed Source Not Being Leak Tested Once Per 6 Months.Caused by Personnel Error.Entries verified.W/881031 Ltr
ML17304A81614 December 1988LER 88-014-00:on 881116,reactor Trip Occurred as Result of Low Steam Generator Water Level.Caused by Inadequate Feedwater Flow Due to Leakage of Packing.Procedural Changes Implemented & Evaluation Being performed.W/881214 LtrBoric Acid
ML17304A8585 January 1989LER 88-015-00:on 881203,new Fuel Area Radiation Monitor RU-19 Discovered Inoperable.Caused by Malfunction in Clock in Computer Internals to Monitor.Area Survey Conducted W/Negative Results & Night Order issued.W/890105 Ltr
ML17304A86827 December 1988LER 88-002-01:on 880122,calculations Indicate That High Log Trip Setpoints Were Set Contrary to Allowable Setpoint. Caused by Inadequate Programmatic Controls to Review Design Changes from Core Reload.Setpoints reset.W/881227 Ltr
ML17304B0052 February 1989LER 89-001-00:on 890103,total Loss of Offsite Power to Class 1E 4.16 Kv Busses 2E-PBA-S03 & 2E-PBB-S04 Occurred.Cause Under Investigation.Two Failed Bushings on Each Transformer Replaced & Transformers inspected/tested.W/890202 Ltr
ML17304B0232 February 1989LER 88-005-01:on 880908,technician Entered Locked High Radiation Area W/O Prior Approval of Radiation Protection Personnel.Caused by Personnel Error.Technician Denied Access to Controlled Area Pending Further training.W/890202 LtrHigh Radiation Area
Locked High Radiation Area
ML17304B0366 February 1989LER 88-025-00:on 881201,discovered Surveillance Procedure Not Completed within Tech Specs Required Frequency.Caused by Inadequate Review of Amend.Surveillance Interval Revised to Be Consistent w/amend.W/890206 Ltr
ML17304B0376 February 1989LER 89-004-01:on 890104,exhaust Rocker Arm for 8L Cylinder Failed,Resulting in Emergency Diesel Generator Trip.Failure Also Reportable Per Part 21.Caused by Crack Which Existed Prior to Delivery.Rocker Arm replaced.W/890206 LtrSafe Shutdown
Nondestructive Examination
ML17304B0612 March 1989LER 89-002-00:on 890203,radioactive Effluent Gaseous Monitor Valve Improperly Installed.Cause of Valve Being Installed Backwards Not Determined.Valve Properly Installed Prior to Returning Monitor to Operable status.W/890302 LtrTime of Discovery
Offsite Dose Calculation Manual
ML17304B0719 March 1989LER 89-003-00:on 890218,control Room Essential Filtration Actuation Signal on Train B Actuated.Caused by Failure of Detector in RU-30.Detector & Preamplifier replaced.W/890309 Ltr
ML17304B07622 March 1989LER 88-008-00:on 890220,determined That Excessive Moisture Condensation Occasionally Discovered in Unit Resulted in Invalid Sample Results.Caused by Cooling of High Humidity Sample Stream.Temporary Heat Trace installed.W/890322 LtrTemporary Modification
ML17304B07820 March 1989LER 89-003-00:on 890217,preplanned Alternate Sampling Sys for Fuel Bldg Discovered Inoperable.Caused by Temporary & Permanent Electrical Loads in Excess of Circuit Capacity. Circuit Breaker Supplying Power opened.W/890320 Ltr
ML17304B0933 April 1989LER 89-001-00:on 890303,electrical Grid Disturbance Resulted in Main Generator Output Breakers Opening.Caused by Malfunction in Steam Bypass Control Sys.Operations Personnel Stabilized plant.W/890403 LtrTime of Discovery
Coast down
ML17304B1004 April 1989LER 89-004-00:on 890305,reactor Trip Occurred on Dnbr.Caused by Control Element Assembly Calculator Failure.Processor Board replaced.W/890404 LtrAnticipated operational occurrence
ML17304B1117 April 1989LER 89-005-00:on 890310,loss of Power Occurred to Alternate Plant Ventilation Effluent Radiation Monitor.Circuit Breaker Opened & Deenergized Alternate Sys.Caused by Electrical Loads in Excess of Capacity.Request issued.W/890407 Ltr
ML17304B19723 May 1989LER 89-011-00:on 890425,instrument & Control Technician Exited High Radiation Area W/O Using Alarm Dosimeter.Caused by Personnel Error.Technician Barred from Entry to Radiological Controlled area.W/890523 LtrHigh Radiation Area
Locked High Radiation Area
ML17304B2331 June 1989LER 89-002-01:on 890203,discovered That Detector Bypass Valve Installed Backwards in Plant Vent Sys Low Range Radioactive Gaseous Effluent Monitor.Cause Not Determined. Valve Properly Installed & Monitors inspected.W/890601 LtrTime of Discovery
Offsite Dose Calculation Manual
ML17304B2477 June 1989LER 89-008-00:on 890509,calculational Error Identified in Surveillance Test That Would Have Resulted in Boron Dilution Alarm Channel 2 Being Inoperable.Caused by Personnel Error. Technician Counseled & Procedure revised.W/890607 Ltr
ML17304B2611 June 1989LER 88-008-01:on 890220,determined That Excessive Moisture Condensation Occasionally Discovered in Unit Resulting in Invalid Sample Results.Caused by Cooling of High Humidity Sample Stream.Resistance Heating installed.W/890601 LtrOffsite Dose Calculation Manual
Temporary Modification
ML17304B3195 July 1989LER 89-002-00:on 890610,main Steam Safety Valve Setpoints Discovered Out of Tolerance.Caused by Setpoint Drift.Valves Readjusted.Testing Will Continue on Refueling Schedule Until Satisfactory Performance observed.W/890710 Ltr
ML17304B35321 July 1989LER 89-014-00:on 890622,discovered That Seismic Monitor Had Been Disconnected & Inoperable Since 890422.Caused by Procedural Failure.Procedure for Removal of Reactor Coolant Pump Motor Being Revised to Alert personnel.W/890721 LtrSafe Shutdown
Earthquake
ML17304B35825 July 1989LER 89-007-01:on 890503,deficiencies Found During Installation of Relays Constituted Reportable Condition. Caused by Inadequate Methodology of Applying Epoxy Matl to Relay Coils.Relays Replaced.Part 21 related.W/890725 Ltr
ML17304B36428 July 1989LER 89-005-00:on 890628,discovered That Sample Flow Rate for Plant Vent Low Range Radioactive Effluent Monitor Below Alarm Setpoint.Caused by Loose Set Coupling Screw. Pre-planned Alternate Sampling Program begun.W/890728 Ltr
ML17304B36627 July 1989LER 89-001-01:on 890103,total Loss of Offsite Power to Class 1E 4.16 Kv Busses 2E-PBA-S03 & 2E-PBB-S04 Occurred.Caused by Reduced Impulse Withstand Voltage Rating Due to Rain.Failed Bushings on Each Transformer replaced.W/890727 Ltr
ML17304B39214 August 1989LER 89-008-00:on 890714,internal Audit Revealed Cooling Tower Sludge Contained Low Level Amounts of Radioactivity. Caused by Lack of Sludge Sampling Before Landfill Disposal. Approval to Dispose of Sludge requested.W/890814 Ltr
ML17304B39314 August 1989LER 89-009-00:on 890712,two Reactor Coolant Pumps Load Shed from Power Supply Triggering Reactor Trip Due to Low Coolant Flow.Caused by Failed Fuse in Bus Potential Transformer.Fuse Replaced & Investigation conducted.W/890814 LtrShutdown Margin
ML17304B40722 August 1989LER 89-009-00:on 890728,inadvertent Train a Fuel Bldg Essential Ventilation Actuation Signal Initiated on Balance of Plant ESF Actuation Sys.Caused by Personnel Error. Individual counseled.W/890822 Ltr
ML17304B41328 August 1989LER 88-010-01:on 880706,ground Fault in 13.8 Kv Bus Caused Fire in Unit Auxiliary Transformer & Reactor Trip.Caused by Bullet Hole Point Faults in Phase Bus B Adjacent to Support Bar.Fire Extinguished & Bus reenergized.W/890824 Ltr
ML17304B42030 August 1989LER 89-006-00:on 890731,loss of Power to Panel 1E-PNB-D26 Caused Power to Remote Indicating & Control Unit & Train B Actuation Signal.Cause for Power Loss Being Investigated. Power Restored to Distribution panel.W/890830 Ltr
ML17304B45212 September 1989LER 89-005-01:on 890412,determined That Deficiencies Identified by Control Components,Inc of Atmospheric Dump Valves Constituted Reportable Part 21 Condition.Caused by Improperly Seated Piston Ring.Valve replaced.W/890912 LtrSafe Shutdown
ML17304B4547 September 1989LER 88-020-01:on 881210,control Element Assemblies Slipped. Caused by Apparent Ground on Lower Lift Coil & Design Defect in Control Element Drive Mechanism Control Sys.Part 21 related.W/890907 LtrUnanalyzed Condition
Shutdown Margin
Anticipated operational occurrence
Rod Drop Event
ML17305A24521 September 1989LER 89-003-01:on 890218,control Room Essential Filtration Actuation Signal on Train B Actuated.Caused by Spurious Trip from Control Room Ventilation Intake Radiation Monitor RU-30 & Detector.Detector replaced.W/890921 Ltr
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