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| Issue date | Title | Topic | |
|---|---|---|---|
| ML18026A493 | 30 March 1998 | LER 97-007-01:on 971017,entry Into TS 3.0.3 Occurred to Allow Completion of Surveillance Testing of One Channel of Rbm.Caused by Failure of Components in LPRM Output to Rbm. Submitted TS Change Request to Extend LCO Action Statement | |
| ML18026A489 | 17 November 1997 | LER 97-007-00:on 971017,TS 3.0.3 Entry Voluntarily Made. Caused by Inadequate Post Maint Testing Following Earlier Work Associated W/Components.Failed Components Repaired, Replaced & Testing Completed | Safe Shutdown Enforcement Discretion |
| ML18026A596 | 2 January 1996 | LER 95-013-00:on 951119,thermally Induced Pressure Locking of HPCI Valve Occurred Under Bonnet Pressure of 3,000-7,000 Psig.Damaged HPCI Injection Valve repaired.W/960102 Ltr | Anchor Darling |
| ML18017A046 | 7 July 1995 | LER 95-008-00:on 950609,shift Average Licensed Core Thermal Power Was Exceeded.Caused by Failed Instrumentation Drift. Repaired & Recalibrated Subject Instrumentation | |
| ML18026A426 | 9 June 1993 | LER 90-007-01:on 900705,primary Power Supply to RPS a Power Distribution Panel Lost When One Electrical Protection Assembly (EPA) Breaker Tripped.Epa Logic Cards Reviewed & RPS Power Supply Will Be redesigned.W/930609 Ltr | |
| ML18026A423 | 17 November 1992 | LER 92-016-00:on 920416,discovered That Existing Analysis for Two Spent Fuel Storage Pools Did Not Reflect Current Fuel Design & Plant Operation.Caused by Failure to Modify FSAR Analysis.Fsar Will Be revised.W/921117 Ltr | Shutdown Margin |
| ML18017A039 | 26 July 1991 | LER 91-010-00:on 910628,RWCU Isolated on Two Occassions Due to Actuations of Steam Leak Detection Instrumentation. Caused by Design Deficiency & Elevated Ambient Penetration Room Temps.Temp Modules replaced.W/910726 Ltr | |
| ML17227A231 | 23 July 1991 | LER 91-009-00:on 910624,RWCU Steam Leak Detection Instrumentation Discovered to Be Inadvertently Actuated During Routine Functional Testing.Caused by Adequate Verbal Communication.Technicians briefed.W/910723 Ltr | |
| ML18026A525 | 5 July 1991 | LER 91-006-00:on 910608,unplanned Actuations of ESF Occurred.Caused by Unexpected Trip of Primary Power Supply EPA Breaker Losing Power.Breakers Reset & Full Power Operation Continued uninterupted.W/910705 Ltr | |
| ML20011F788 | 2 March 1990 | LER 90-005-00:on 900203,station Alert Declared When Reactor Coolant Temp Exceeded 200 F Due to Temporary Loss of Normal Method Dhr.Caused by Short Circuit to Ground in Bus Distribution Panel.Circuit Breakers replaced.W/900302 Ltr | Reactor Vessel Water Level |
| ML20005F340 | 4 January 1990 | LER 89-010-01:on 890920,determined That Estimated Leakage for Main Steam Line Containment Penetrations a & B Exceeded Tech Spec Limit During Local Leak Rate Testing.Cause Not Determined.Msiv Poppet Seats & Discs lapped.W/900104 Ltr | |
| ML18040A912 | 23 September 1988 | LER 88-018-00:on 880824,discovered That RWCU Pump Room Ambient Temp Sensor Not Installed Per Design.Caused by Lack of Installation Detail on Design Documents for Steam Leak Detection Sys.Tech Spec Change submitted.W/880923 Ltr | Reactor Vessel Water Level Enforcement Discretion |
| ML19310G942 | 21 April 1986 | LER 86-005-00:on 860321 Differential Pressure Condition Detected,Causing Supply Dampers to Oscillate.Caused by Open Plenum Door & Exhaust Damper Linkage Binding.Linkage Reworked & lubricated.W/860421 Ltr | Boric Acid Anchor Darling Backfit |
| ML20024E802 | 19 August 1983 | LER 83-107/01P-0:on 830819,during Maint,Emergency Svc Water Loop Discharge a to Spray Pond Valve Would Travel Only in Closed Direction.Cause Unstated.Mechanical Stops Loosened, Permitting Valve to Be Opened to Proper Position | |
| ML20024E631 | 4 August 1983 | Updated LER 83-093/01X-1:on 830711,31-day Functional Test of Containment Radiation Monitor a Not Performed for 830612-0711.Caused by Lack of Timely Chemistry Mgt Review of surveillance.W/830804 Ltr | Missed surveillance |
| ML20024D914 | 26 July 1983 | Updated LER 83-035/03X-1:on 830228,during 4 H RCS Unidentified Leakage Test,Pump B of Drywell Sump a Continued to Operate for 4 H W/O Change in Sump Level.Caused by Clogged Pump Impeller.Pump cleaned.W/830726 Ltr | |
| ML20024E160 | 25 July 1983 | LER 83-098/03L-0:on 830625,position of Valve Indeterminate Due to Dual Status Indication for Suppression pool-to- Drywell Vacuum Breaker.Caused by Insufficient Limit Switch Plunger Position.Limit Switches adjusted.W/830725 Ltr | |
| ML20024D991 | 22 July 1983 | LER 83-096/03L-0:on 830624,RCIC Leak Detection B Power Failure Alarm Received.Undervoltage Trip Caused by Loss of Startup Transformer.Inverter Manually reset.W/830722 Ltr | |
| ML20024C238 | 29 June 1983 | LER 83-088/03L-0:on 830530,RCIC Pump Discharge Valve Would Not Open.Caused by Gap Between Breaker Male & Female Stab Clips.Female Clips Reworked to Allow Proper Contact. W/830629 Ltr | |
| ML20024C100 | 24 June 1983 | LER 83-085/03L-0:on 830525,containment Isolation Valve for Containment Atmosphere Control Sample Line Failed to Close. Cause Not Stated.Maint Personnel Verified Switch Positioning & Reconnected circuitry.W/830624 Ltr | |
| ML20024C114 | 24 June 1983 | LER 83-087/03L-0:on 830527,A Containment H2/02 Analyzers Found to Have Erratic Readings.Caused by Pressure Control Valve & Sample Pump Degradation to Point Where Proper Flow Not Maintained.Failed Components replaced.W/830624 Ltr | |
| ML20024C245 | 24 June 1983 | LER 83-086/03L-0:on 830525,reactor Bldg Door Opened While Maint Performed on Turbine Bldg Side of Air Lock to Reactor Bldg.Caused by Personnel Error.Individual W/Radio Communication Will Be posted.W/830624 Ltr | |
| ML20024C246 | 23 June 1983 | LER 83-084/03L-0:on 830524,during Surveillance Testing, Control Room Emergency Outside Air Supply Sys Fan Tripped. Caused by Out of Tolerance of Time Delay Relay for Heater Differential Temp.Relay reset.W/830623 Ltr | |
| ML20024A840 | 21 June 1983 | LER 83-082/01T-0:on 830607,main Turbine Trip on High Reactor Pressure Vessel Level Bypassed to Clear Interlock.After Outage,Bypass Discovered Still Installed.Caused by Lack of Clear Requirement for Bypass review.W/830621 Ltr | Feedwater Controller Failure |
| ML20024A533 | 27 May 1983 | LER 83-067/01T-0:on 830516,reactor Mode Switch Placed in Startup Position & Half Scram Developed.Caused by Improper Functioning of Reactor Mode Switch Contacts.Switch Replaced. W/830527 Ltr | Half scram |
| ML20024A342 | 27 May 1983 | LER 83-070/01T-0:on 830517,flow Rates Required to Maintain Positive Pressure in Control Structure Appeared to Exceed Tech Spec Limits.Flow Limit Inadvertently Omitted from Procedure.Procedure corrected.W/830527 Ltr | |
| ML20024A330 | 27 May 1983 | LER 83-075/01T-0:on 830515,found Chlorine Detectors on Control Room Emergency Outside Air Supply May Prevent Operation in Pressurization Mode Following Loss of Power. Emergency Operation Procedures revised.W/830527 Ltr | |
| ML20024A395 | 26 May 1983 | LER 83-071/03L-0:on 830426,overvoltage Setting on One RPS Alternate Electrical Protection Assembly Found Greater than Tech Spec Limit.Caused by Instrument Drift.Overvoltage Setting Calibr within limits.W/830526 Ltr | |
| ML20023D512 | 11 May 1983 | LER 83-063/03L-0:on 830411,main Steam Line Drain Valve Leakage Exceeded Tech Spec Limit.Cause Not Stated.Seal Ring Replaced,Outboard Valve Lapped & Valves Reassembled | |
| ML20023B838 | 29 April 1983 | LER 83-057/01P-0:confirms 830428 Telcon Re Incident Concerning Bypass Leakage Calculations for Feedwater Following DBA LOCA | |
| ML20028D687 | 10 January 1983 | LER 83-001/01P-0:confirms 830107 Telcon Re Failure to Comply W/Action Statement Requiring Grab Samples of Offgas Sys After Declaring One Train of Hydrogen Monitor Inoperable. Caused by Inadequate Shift Turnover in Chemistry Dept | Grab sample |
| ML20028D314 | 7 January 1983 | LER 82-072/03L-0:on 821210,while Performing Surveillance, One Control Rod Would Not Indicate at One Position.Possibly Caused by Intermittent Fault on Circuit Board.Printed Circuit Board Reinstalled | |
| ML20028D287 | 6 January 1983 | LER 82-069/03L-0:on 821207,during Startup Testing,Hpci Sys Declared Operable Prior to Closing Out Open Equipment Release Form.Caused by Work Program Design Weakness.Present Work Practice Modified | |
| ML20028D260 | 5 January 1983 | LER 82-061/01T-0:on 821228,during Startup Testing,While Performing Loss of Offsite Power Test,Emergency Svc Water Pumps B & D Failed to Start.Loop B Failure Caused by Loose Relay Terminal Wiring.Loop D Caused by Contact Adjustment | |
| ML20028D267 | 5 January 1983 | LER 82-062/01T-0:on 821222,during Loss of Offsite Power Startup Test,Standby Gas Treatment Sys Did Not Operate as Designed When False High Radiation Signal Received from Discharge Monitor.Caused by Monitor Failing High | |
| ML20028B720 | 24 November 1982 | LER 82-045/03L-0:on 821025,essential Svc Water Pump Failed to Start.Cause Could Not Be Determined or Reproduced.Svc Pump Tested 5 Times W/O Recurrence of Failure | |
| ML20028B582 | 19 November 1982 | Revised LER 82-026/01T-1:on 820717,review Revealed Certain Cables Discussed in Deficiency Rept 80-00-28 Not Flexed or Grounded Prior to Fuel Load.Caused by Failure to Maintain Control Over Fddr KRI-607 During Turnover of Const | |
| ML20028B030 | 18 November 1982 | LER 82-042/01T-0:on 821117,personnel Failed to Take Grab Samples When RHR Svc Water Sys Radiation Monitor Was Inoperable | Grab sample |
| ML20028B435 | 18 November 1982 | LER 82-043/01T-0:on 821117,determined That Failure of Single Component Could Defeat Overload Detection & Protection Devices for Containment Penetration Carrying Power Cables for Reactor Recirculation Pumps.Cause Not Stated | |
| ML20028A954 | 16 November 1982 | LER 82-040/03L-0:on 821018,deluge Sys in CREOASS Initiated. Caused by Maint Personnel Bumping Fire Sys thermo-switch on Charcoal Beds.Charcoal Changed Out & Preventive Maint Procedures Modified to Valve Out Deluge Sys During Maint | |
| ML20028B046 | 12 November 1982 | Revised LER 82-003/01T-2:on 820811,during Initial Fuel Loading,Sprinkler Sys Did Not Exist in Area Designated by Tech Specs & Fire Protection Review Rept.Caused by Discrepancies in as-built Conditions.Mods Initiated | Hourly Fire Watch |
| ML20028A334 | 3 November 1982 | LER 82-034/03L-0:on 821011,during Startup Testing,Creoass Train a Declared Inoperable When Outside Air Damper Failed to Close.Caused by Inadequate Lubrication of Actuator Stem. Stem Lubricated & Damper Returned to Svc | |
| ML20027D059 | 19 October 1982 | LER 82-027/03L-0:on 820920,two Drywell/Suppression Chamber Vacuum Breakers Gave False Position Indications During Stroking.Caused by Loose Couplings Connecting Limit Switch to Vacuum Relief Valve Shaft.Set Screw Replaced | |
| ML17139B031 | 13 September 1982 | LER 82-013/03L-0:on 820814,radiation Monitor Found Inoperable.Caused by Faulty Gm Tube & Signal Conditioner (Sensor Converter).Tube & Signal Conditioner Replaced & Monitor Returned to Svc | |
| ML20027B057 | 8 September 1982 | LER 82-007/01T-1:on 820825,updated Secondary Containment Vol Calculation Had Not Replaced Preliminary Analysis Utilized to Obtain Values in Fsar.Vol Based on Preliminary Calculation Which Did Not Account for Floors & Equipment | |
| ML20027A958 | 3 September 1982 | LER 82-005/01T-1:on 820820,during Preoperational Testing, Control Room Emergency Outside Air Supply Sys Did Not Automatically Start on Isolation Signal.Caused by Unauthorized Personnel Changing Flow Controller Switch | |
| ML17139A907 | 2 August 1982 | LER 82-001/01T-0:on 820718,unacceptable Linear Indications Found by Radiograph of A-11 Weld.Cause Not Determined.Welds Repaired Per Approved Repair Program |