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 Issue dateTitleTopic
ML17300A77517 April 1987LER 87-002-00:on 870320,Class 1E Train B Bank of Pressurizer Backup Heaters Could Not Be Energized from Control Room,Per Tech Spec Requirement.Caused by Malfunction of Heater Breaker & Personnel Error.Breaker replaced.W/870417 Ltr
ML17300A78120 April 1987LER 87-004-00:on 870323,discovered That Spectrum Analysis Not Done for Three Grab Samples Taken on 870320 from Turbine Bldg Sump & Condenser Area Sump.Caused by Personnel Error. Event Discussed W/Chemistry personnel.W/870420 LtrGrab sample
ML17300A78824 April 1987LER 87-001-00:on 870328,while Preparing to Enter Mode 6, Control Room Essential Filtration Actuation Signals & Containment Purge Isolation Actuation Signals Received.Cause Under investigation.W/870424 LtrSlow transfer
ML17300A79327 April 1987LER 87-011-00:on 870331,while in Mode 1,fire Watch Round Not Performed Per Tech Spec 3.7.12.Caused by Cognitive Personnel Error.Fire Watch Patrolman Counseled on Safety Warnings & Scheduled for Addl training.W/870427 LtrFire Watch
Hourly Fire Watch
ML17300A8246 May 1987LER 87-013-00:on 870408,Tech Spec 3.0.3 Entered Due to Inoperability of ESF Pump Room Air Exhaust Sys.Caused by Cognitive Personnel Error.Memo Sent to Onsite Managers Reminding Personnel of responsibilities.W/870506 Ltr
ML17300A85315 May 1987LER 87-020-00:on 870416,Train B Fuel Bldg Essential Ventilation Actuation Signal Received on Balance of Plant ESFAS Due to Communication Malfunction.Caused by Byte Error. Time Delay Relays in Circuitry installed.W/870515 LtrGrab sample
ML17300A85415 May 1987LER 87-004-00:on 870416,reactor & Turbine Trip Occurred. Caused by High Local Power Density Trip Signals Generated by Core Protection Calculators.Effects of Cycling Each Breaker Will Be Incorporated Into guidelines.W/870515 Ltr
ML17300A86620 May 1987LER 87-007-00:on 870423,time Interval for Sampling Concentration of Hydrogen & Oxygen in Gaseous Radwaste Sys Exceeded,Contrary to Tech Spec 3.3.3.9.Caused by Cognitive Personnel Error.New Form Used to Aid personnel.W/870520 LtrGrab sample
ML17300A9837 August 1987LER 87-016-00:on 870718,contents of Chemical Waste Neutralization Tank Released to Onsite Evaporation Pond Exceeding Tech Spec 3.11.1.1 Limit for Mo-99.Caused by Personnel Error.Briefing Session planned.W/870807 Ltr
ML17300A98712 August 1987LER 87-012-00:on 870716,discovered That Time Interval for Performance of Tech Spec Surveillance Requirement 4.6.1.3.b.1 Exceeded on 870102.Caused by Error in Approved Procedure.Procedure to Be revised.W/870812 Ltr
ML17300B02626 August 1987LER 87-021-00:on 870729,control Room Essential Filtration Actuation Initiated on Channels a & B of Esfas.Caused by Voltage Spike.Monitor Reset,Returning Setpoint to Specified value.W/870826 Ltr
ML17300B09115 October 1987LER 86-044-01:on 870515,discovered That Beginning on 860423- 25,both Independent Trains of Control Room Essential Filtration Sys Inoperable Due to Maint Activity.Caused by Inadequate Design.Change Request initiated.W/871015 Ltr
ML17300B14621 December 1987LER 87-019-00:on 871122,reactor Trip Occurred Due to Core Axial Shape Index Out of Bounds.Caused by Deficient Procedure & Faulty Contact.Procedural Enhancements Initiated & Faulty Contact replaced.W/871221 Ltr
ML17300B1715 January 1988LER 87-027-00:on 870728,unit Entered Mode 4 (Hot Shutdown) W/O Meeting Surveillance Requirements for Containment Spray Sys Train B Pump.Caused by Personnel Error.Train a Pump Tests Verified & Procedure revised.W/870105 Ltr
ML17300B1843 February 1988LER 88-001-00:on 880104,special Rept Not Submitted as Required by Tech Spec 3.3.3.3.Special Rept Required to Rept Seismic Monitoring Sys Inoperable Longer than 30 Days. Caused by Personnel Error.Cause Under review.W/880203 LtrSafe Shutdown Earthquake
Operating Basis Earthquake
ML17300B20816 February 1988LER 88-003-00:on 880120,operability of Ac Offsite Sources Not Verified within 1 H After Declaring Diesel Generator Operable Following Preventative Maint.Caused by Personnel Error.Disciplinary Action administered.W/880216 Ltr
ML17300B21316 February 1988LER 88-002-00:on 880118,ASME Section XI Surveillance Test Interval Exceeded.Caused by Inadequate Administrative Controls Established for Tracking of Partially Completed Surveillance Tests.Controls established.W/880216 Ltr
ML17300B2475 January 1990LER 89-011-00:on 891206,discovered That Quarterly ASME Surveillance Testing on Train a of Air Start Sys Check Valve for Train B Emergency Diesel Generator Not Performed.Caused by Insufficient Controls.Procedure revised.W/900105 LtrMissed surveillance
ML17300B2488 January 1990LER 89-023-00:on 891208,ESF Equipment Room Essential Ventilation Fans Declared Inoperable When Turning Valves Determined Not to Be Seismically Qualified.Caused by Inadequate Program.Bracing Installed on duct.W/900108 LtrSafe Shutdown
Earthquake
ML17300B25411 June 1996LER 96-001-01:on 960404,inappropriate Grounding of Equipment Resulted in Condition Outside Design Basis of Plant. Established Fire Watches Required for Affected AreasSafe Shutdown
Temporary Modification
Emergency Lighting
ML17303A3801 April 1987LER 87-005-00:on 870305,fire Patrol for Control Diesel Generator & Main Steam Support Structure Performed Late. Caused by Malfunctioning Access Door to Main Steam Support Structure.Door Returned to svc.W/870401 LtrFire Watch
ML17303A38130 March 1987LER 87-005-00:on 870302,while Unit in Mode 4,hourly Fire Watch Patrol Not Performed in Accordance W/Tech Spec 3.7.12. Caused by Cognitive Personnel Error.Foreman Disciplined & Instructed on Importance of Fire watches.W/870330 LtrFire Barrier
Fire Watch
Hourly Fire Watch
ML17303A3933 April 1987LER 87-006-00:on 870307,during Surveillance Test,Limiting Condition for Operation 3.0.3 Entered When Tech Spec 3/4.6.3 Action Statements Could Not Be Met.Caused by Inoperability of Msivs.Tech Spec Change Request submitted.W/870403 Ltr
ML17303A39430 March 1987LER 85-035-01:on 850525 & 0604,pump Performance Tests Not Reviewed within 96 H,Per IWP-3220 of ASME Code.Caused by Procedural Error.Procedures for Surveillance Program Changed to Direct All Procedures to engineers.W/870330 Ltr
ML17303A40213 April 1987LER 87-008-00:on 870314,fire Patrol Performed Six Hours Late Due to Log Omission.Caused by Cognitive Personnel Error.Fire Protection Technician Counseled on Area of responsibility.W/870413 LtrFire Watch
ML17303A40313 April 1987LER 87-002-00:on 870317,continuous Fire Watch Not Established within Required Time,Per Tech Spec 3.7.11.2 Action A.Caused by Personnel Error.Fire Protection Personnel Counseled on Importance of Proper performance.W/870413 LtrContinuous fire watch
Fire Watch
Hourly Fire Watch
ML17303A4318 June 1987LER 87-013-00:on 870510,shutdown Commenced Per Tech Spec 3.8.3.1 Due to Inoperable Inverter.Caused by Loose Silicon Controlled Rectifier (Scr).Loose SCR Replaced & Other SCRs retorqued.W/870608 Ltr
ML17303A4422 July 1987LER 87-017-00:on 870608,discovered That 4-h Samples of Gaseous Radwaste Sys Had Not Been Taken as Required.Caused by Improper Communication Between Chemist & Control Room Operator.Night Order initiated.W/870702 LtrGrab sample
ML17303A4432 July 1987LER 87-014-00:on 870605,discovered That Auxiliary Sample Cart in Svc as Backup to Fuel Bldg Ventilation Radiation Monitor Turned Off & Inoperable.Caused by Personnel Error. Radiation Protection Technician terminated.W/870702 LtrGrab sample
ML17303A4732 July 1987LER 87-009-00:on 870604,inadvertent Control Room Essential Filtration Actuation Occurred Due to Radiation Monitor Pump Cycling.Caused by Motor Drawing Too Much Current.Ground to Motor & Radiation Monitor separated.W/870702 LtrGrab sample
ML17303A52229 July 1987LER 87-017-00:on 870630,auxiliary Operator Entered High Radiation Area W/O Radiation Monitoring Devices Required by Tech Specs.Caused by Personnel Error.Exposure within 10CFR20 Limits.Disciplinary Action taken.W/870729 LtrHigh Radiation Area
ML17303A5623 September 1987LER 87-015-00:on 870816,control Room Essential Filtration Actuation Initiated on Channels a & B of ESF Actuation Sys. Caused by Spurious Alarm/Trip Signal on Radiation Monitor RU-30.Train B Placed in bypass.W/870903 Ltr
ML17303A58118 September 1987LER 87-002-01:on 870615,control Room Essential Filtration & Containment Purge Isolation Actuation Signals Received on Both Channels of Balance of Plant Esfas.Caused by Calibr of Static Transfer Switch.Switch recalibr.W/870918 Ltr
ML17303A58518 September 1987LER 87-001-01:on 870328,control Room Essential Filtration & Containment Purge Isolation Actuation Signals Received on Both Channels of balance-of-plant Esfas.Caused by Faulty DC to DC Converter Board.Board replaced.W/870918 LtrSlow transfer
ML17303A58925 September 1987LER 87-018-00:on 870827,reactor Trip Occurred During Shutdown to Check RCS Pressure Boundary Leak.Trip Caused by Deficient Procedure.Leak Caused by Cracked Weld.Procedural Enhancements Made & Valve replaced.W/870925 LtrPressure Boundary Leakage
Pressure boundary leak
ML17303A6012 October 1987LER 87-003-00:on 870929,condition Identified That,If Not Corrected,Could Have Resulted in Improper Operation of Two Shutdown Cooling Isolation Valves in Redundant Trains.Caused by Vendor Error.Bolting replaced.W/871002 Ltr
ML17303A6061 October 1987LER 87-024-00:on 870902,two Dma Interface Cards Providing Input to Core Operating Limit Supervisory Sys Found Incorrectly Installed.Caused by Cognitive Personnel Error. Computer Technician counseled.W/871001 Ltr
ML17303A66029 October 1987LER 87-018-00:on 871004,ESF Signal Initiated on Train B & cross-tripped Train a as Designed.Caused by Spurious Signal Due to Voltage Spike Caused by Electronic Noise.Plant Change Package initiated.W/871029 Ltr
ML17303A70624 November 1987LER 87-015-01:on 870816,control Room Essential Filtration Actuation Initiated on ESFAS Channels a & B.Caused by Voltage Spike on RU-30.Monitor Reset,Train B Returned to Svc & Procedural Change initiated.W/871124 Ltr
ML17303A70724 November 1987LER 87-026-00:on 871027,automatic Actuation of Balance of Plant ESF Occurred Due to Inadvertent Containment Purge Isolated Actuation Signal.Caused by Personnel Error. Responsible Individual Will Be reinstructed.W/871124 Ltr
ML17303A70824 November 1987LER 87-005-00:on 871030,while Unit in Mode 3,main Steam Isolation Sys Automatically Actuated.Caused by Faulty Logic Card for MSIV-170.Faulty Logic Card replaced.W/871124 Ltr
ML17303A7307 January 1988LER 87-016-01:on 870609,both Trains of ESF Pump Room Air Exhaust Cleanup Sys Inoperable.Caused by Personnel Error. Operations Dept Experience Rept & Night Orders Developed & Issued & Warning Tags Placed on equipment.W/880107 Ltr
ML17303A74015 January 1988LER 87-028-00:on 871217,inability to Meet Tech Spec Requirements Encountered Due to Failure to Retain Monitor Samples.Caused by Personnel Error.Technician Disciplined & Chemistry Dept Will Receive training.W/880115 Ltr
ML17303A74315 January 1988LER 87-004-00:on 871217,w/reactor at 50% Test Plateau During Power Ascension Testing,Reactor Trip Occurred.Caused by Malfunctioning Logic Sequencer Card in Control Element Drive Mechanism Control Sys.Card replaced.W/880115 Ltr
ML17303A77119 February 1988LER 88-005-00:on 880123,backhoe Operator Inadvertently Damaged Post Indication Valve (Piv)(Kp)(Isv) & Caused Fire Suppression Water to Discharge Into Protected Area.Caused by Inadequate Procedure.Procedures implemented.W/880219 LtrContinuous fire watch
Fire Protection Program
Fire Watch
Hourly Fire Watch
ML17303A77326 February 1988LER 88-005-00:on 880221,inadvertent Safety Injection from Safety Injection Tanks (Bp)(Acc) Occurred.Caused by Personnel Error.Appropriate Disciplinary Measures Will Be Taken.Malfunctioning Fuse replaced.W/880226 LtrShutdown Margin
ML17303A79319 February 1988LER 87-018-01:on 870827,reactor Trip Occurred Due to Axial Shape Index of Reactor Core.Caused by Deficient Procedure. Procedural Enhancements implemented.W/880219 LtrPressure Boundary Leakage
Pressure boundary leak
ML17303A8064 March 1988LER 88-001-00:on 880204,discovered Isolation Valve in Containment Pressure Transmitter Sensing Line Shut.Cause Not Determined.Pressure Transmitter Properly Aligned & Returned to svc.W/880304 LtrPost Accident Monitoring
ML17303A84011 March 1988LER 88-008-00:on 880212,RCS Leakage Monitor Declared Inoperable Due to Notification of Particulate change-out Excess.Caused by Personnel error.Change-out Periodicity Revised to Once Per 24 h.W/880311 LtrTime of Discovery
Grab sample
ML17303A86811 March 1988LER 88-004-00:on 880210,identified That Discharge Valve of Auxiliary Feedwater Pump Mispositioned in Closed Position. Caused by Personnel Errors.Event Will Be Reviewed by Operating Crews in All Three units.W/880311 Ltr
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