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| Issue date | Title | Topic | |
|---|---|---|---|
| ML16148A396 | 3 December 1980 | LER 80-009 Has Been Cancelled | Backfit |
| ML18024A449 | 29 September 1978 | LER#78-024/03L-0 on 780911:during Refueling While Performing Surveillance Instru SI-42B-31 2 Broken Wire Was Found on Signal Lead for RCIC Turbine High Steam Flow Switch PDIS-71- 1B Which Provides RCIC Isolation.Loose Connection Repaired | |
| ML18024A457 | 29 September 1978 | LER#78-025/01T-0 on 780917:during refueling,4 Mstv'S Exceeded Leakage Limits.Defective Valves Will Be Repaired & Retested | |
| ML18024A490 | 13 October 1978 | LER 78-016/01T-0:on 780930,cracking Discovered in 1-inch Instrument Line & 3/4-inch Bonnet Vent Line on FCV-68-1. Cause Undetermined | |
| ML18024A494 | 17 October 1978 | LER 78-026/03L-0:on 780924,during Refueling Outage,Smoke Detector XS-39-93KB Alarmed W/O Cause & Could Not Be Cleared.Caused by Normal Aging | |
| ML18024A498 | 25 October 1978 | LER 78-017/03L-0:on 781004,drywell Oxygen Concentration Was Not Reduced to 4% within 24 H Period After Placing Reactor in Run Mode.Caused by Personnel Safety Considerations During Repair of Inner Drywell Air Lock Repairs | |
| ML18024A527 | 8 November 1978 | LER#78-027/03L-0 on 781012:during Refueling Outage,Panel 3-25-327 Was Inoperable,Placing 2 Smoke Detector Zones Out of Svc.Caused by a Contact on Power Transfer Relay Which Failed to Close After Short Power Interruption | |
| ML18024A534 | 6 November 1978 | LER#78-028/03L-0 on 781014:during Refuel outage,1 Smoke Detector XS-39-108ZE in Mech Equip Room on Elevation 617 Caused False Alarm That Would Not Clear.Caused by Normal Natural Aging of Detector | |
| ML18024A561 | 27 November 1978 | LER#78-030/03L-0 on 781031:evidence of Grease in 6 Snubbers Located in Core Spray,Main Steam & Residual Heat Removal Sys.Snubbers Replaced.Recurrence Control Action Incl Replacement of Grease Fittings W/Those Incompatible W/Guns | |
| ML18024A574 | 4 December 1978 | LER#78-018/03L-0 on 781103:reactor Pressure Switch PS-6B-96, Switch 1 Failed to Operate During Surveillance Testing. Switch Exercised & Adjusted | |
| ML18024A579 | 7 December 1978 | LER#78-020/03L-0 on 781110:during Normal Pwr Oper,Reactor & Turbine Bldg & Refueling Zone Ventilation Exhaust Monitor, RM-90-250 Became Inoperable.Instr & Its Sensing Line Dried Out & Returned to Svc | |
| ML18024A588 | 11 December 1978 | LER#78-031/01T-0 on 781128:during CRD Scram Timing & Associated LPRM Connect on Verification Noted That All LPRMs Had Been Connected in Reverse Order.Caused by Lack of Explanation in Documents Describing Connection Procedure | |
| ML18024A591 | 13 December 1978 | LER#78-033/03L-0 on 781114:leakage from 35 Isolation Valves Which Terminate Below Suppression Pool Water Level Exceeded Inventory Restriction of 20781 Cubic Feet Per 30 Days.Caused by Wearing of Seats on Valves | |
| ML18024A601 | 20 December 1978 | LER#78-021/03L-0 on 781201:suppression Chamber Hydrogen Monitoring Sys Failed to Meet Tech Spec Requirements.Caused by Low Signal Output of Torus Hydrogen Sensor | |
| ML18024A607 | 22 December 1978 | LER 78-032/03L-0 on 781124:during Master Refuel Test Instruction,Rcic Tripped on Overspeed & Was Inoperable. Electro-Governor-Regulator,Electro-Governor-Mechanism & Ramp Generator Were Replaced & RCIC Proved Operable | |
| ML18024A613 | 27 December 1978 | LER 78-022/03L-0 on 781202:reactor,turbine Bldg & Refueling Zone Ventilation Exhaust monitor,RM-90-250,became Inoperable.Caused by Moisture Collected in Sampling Line of Monitor | Grab sample |
| ML18024A628 | 4 January 1979 | LER 78-023/03L-0 on 781211:reactor High Pressure Switches Ps-3-204A&B Exceeded Tech Spec Limits When Static-O-Ring 9N-AA45-(x9)-TT Pressure Switch Drifted Out of Tolerance | |
| ML18024A638 | 12 January 1979 | LER 78-034/03L-0 on 781216:during Normal Operation,The Relief Valve on Discharge of Standby Liquid Control Pump 3A PCV-63-512 Was Observed to Open at Wrong Set Pressure. Caused by Maladjustment of Crosby 1X2 Style Jm Wk Valve | |
| ML18024A660 | 15 January 1979 | LER 78-024/03L-0 on 781219:drywell Air Compressor Suction Valve FCV-32-62 Failed to Close Due to O-ring Failure within Electropneumatic Control Valve FSV-32-62.Latter Valve Replaced & Subsequent Testing Was Satisfactory | |
| ML18024A670 | 30 January 1979 | LER 79-001/03L-0 on 790111:switch on LIS-3-56B Failed to Trip Reactor Recirculation Pump Motor Generator.Caused by Misadjusted Switch on Yarway Model 4418CE.Switch Recalibr & Tested Satisfactorily | |
| ML18024A678 | 8 February 1979 | LER 79-001/03L-0 on 790113:during Test of high-pressure Injection Coolant Sys,Steam Supply Valve FCV-73-16 Failed to Open,Rendering Sys Inoperative.Caused by Failure of Limitorque Valve Operator Limit Switch | |
| ML18024A683 | 6 February 1979 | LER 79-002/03L-0 on 790117:during Maintenance of Reset Switch,Short Circuit Damaged Power Supply & Sensor Circuit Board,Rendering Fixed Spray Automatic Initiation Circuit for Fire Protection Inoperable | Fire Watch |
| ML18024A698 | 27 February 1979 | LER 79-003/01T-0 on 790214:rod Position Info Sys Power Supply Ps X-5 Failed,Causing Loss of Rod Position Indication in Bottom Half of Vertical Core Display.Caused by Failure of Cooling Fan in Trygon Model L5B6-70-OVS4989 | |
| ML18024A709 | 1 March 1979 | LER 79-003/03L-0 on 790202:linear Heat Generation Rate Out of Tech Spec Limits.Caused by Operation Close to Limiting Values & Increase in Reactivity Due to Gadolina Burnup. Greater Margin to Limiting Value Will Be Maintained | |
| ML18024A713 | 1 March 1979 | LER 79-002/03L-0 on 790203:alarm for Fire Protection Panel 25-236 Annunciated in Control Room.Panel Was Not Alarmed Condition.Caused by Normal End of Life Electrical Failure of Annunciator Point Card.Card Replaced & Sys Normalized | Fire Watch |
| ML18024A786 | 7 May 1979 | LER 79-004/03L-0 on 790411:during Normal Operation,Heat Detector Alarmed & Would Not Clear.Alarm Would Have Masked Signals from Other Detector,Required to Be Operational.Caused by Personnel Damaging Detector | Fire Watch |
| ML18024A789 | 7 May 1979 | LER 79-004/03L-0 on 790414:reactor Bldg,Turbine Bldg & Refueling Zone Vent Exhaust Monitor RM-90-250 Failed Surveillance Test SI 4.8.B-4.3,Section 4e.Caused by Failure of Input Card for Radiation Monitor | |
| ML18024A803 | 17 May 1979 | LER 79-005/03L-0 on 790419:broken Terminal Discovered on Shutdown Board D Battery.Cause Unknown.Affected Cells Replaced & Personnel Instructed in Proper Tightening Methods | |
| ML18024A811 | 18 May 1979 | LER 79-008/01T-0 on 790504:while Preparing for Refueling Outage,Secondary Containment Integrity Was Not Conclusively Demonstrated Prior to Breaking Primary Containment.Test Improperly Performed Due to Personnel Error | |
| ML18024A816 | 29 May 1979 | LER 79-007/03L-0 on 790503:during Refueling Outage,Five MSIVs Exceeded Leakage Limits.Caused by Irregularities on Valve Seating Surfaces & Entrapment of Debris Under Seating Surfaces.Valves Will Be Repaired & Retested | |
| ML18024A820 | 18 May 1979 | LER 79-005/01T-0 on 790506:when RHR Svc Water Supply to 2B RHR Heat Exchanger Was Isolated for Maint,Standby Coolant Supply to Unit Was Also Isolated.Caused by Lack of Administrative Control Over Sys cross-connect Valves | |
| ML18024A826 | 24 May 1979 | LER 79-006/03L-0 on 790427:prior to Refueling Shutdown, Drywell Prepurge Tritium Sample Not Taken.Caused by Lack of Understanding Between Operational & Lab Personnel.Operating Instructions Amended to Prevent Recurrence | |
| ML18024A832 | 6 June 1979 | LER 79-011/01T-0 on 790526:while Pulling Control Rods,First Rod 26-27 in Group 3 Was Inadvertently Withdrawn Three Notches.Caused by Unexplained Factors.Procedures Were Revised | |
| ML18024A839 | 5 June 1979 | LER 79-006/03L-0 on 790507:observed Erratic Indication of Torus Hydrogen Sensor H2M-76-38.Caused by Defective Sensor. Part Replaced | |
| ML18024A842 | 6 June 1979 | LER 79-009/03L-0 on 790510:scram Accumulator Level Switch LS-2-85-34 for Control Rod Drivelines 58-39 & 58-19 Failed to Give Annunciation for High Accumulator Level.Caused by Switch Failure | |
| ML18024A845 | 7 June 1979 | LER 79-010/03L-0 on 790510:residual Heat Removal Sys Snubber Came Apart Upon Removal for Testing.Caused by Piston Unscrewing from Rod After Locking Key Vibrated Loose.Snubber Replaced & Other Snubber Tested | |
| ML18024A864 | 26 June 1979 | LER 79-012/03L-0 on 790528:during post-refueling Startup Testing of RCIC Turbine, Electronic Overspeed Device Could Not Be Reset.Caused by Failure of Electronic Overspeed Device,Airpax Model FSS 406.Overspeed Device Replaced | |
| ML18024A868 | 26 June 1979 | LER 79-014/01T-0 on 790526:during Cold Shutdown for Refueling,Local Leak Rate Was Found to Exceed Tech Spec Levels.Caused by Deterioration of Valve Seats in Main Steam, Ventilation, Feedwater & RCIC Sys.Valves Repaired | |
| ML18024A871 | 28 June 1979 | LER 79-013/03L-0 on 790530:reactor Core Isolation Cooling Tripped on Overspeed During Flow Test W/Reactor at Rated Temp & Pressure.Loss of Speed Signal in Control Room Ocurred.Caused by Malfunction of Actuator | |
| ML18024A880 | 3 July 1979 | LER 79-016/03L-0 on 790605:pressure Switches PS-1-81A & B & Setpoints PS-1-91A & B Exceeded Tech Spec Limits During Test.Caused by Instrument Drift.Switches Recalibr & Tested Satisfactorily | |
| ML18024A883 | 5 July 1979 | LER 79-015/03L-0 on 790607:HPCI Tripped on Mechanical Overspeed.Caused by Damaged Ball & Tappet Assembly Due to Improper Setting of Trip Weight.Ball & Tappet Assembly Replaced & Trip Weight Properly Set | |
| ML18024A884 | 27 June 1979 | LER 78-012 Has Been Voided | |
| ML18024A885 | 27 June 1979 | LER 78-007 Has Been Voided | |
| ML18024A886 | 27 June 1979 | LER 78-013 Has Been Voided | |
| ML18024A900 | 11 July 1979 | LER 79-007/03L-0 on 790612:during Performance of Procedure SI 4.1.A-14,turbine First Stage Permissive Pressure Switches PS-1-81A & B & PS-1-91A & B Setpoints Exceeded Tech Specs. Caused by Setpoint Drift.Switches Recalibr | |
| ML18024A903 | 12 July 1979 | LER 79-017/03L-0 on 790615:during Normal Operation,Setpoint on Pressure Switch PS-3-22D Exceeded Specified Limit.Caused by Drift in Model B2T-A12SS Switch.Switch Recalibr & Satisfactorily Tested | |
| ML18024A904 | 27 June 1979 | LER 78-007 Is Voided | Backfit |
| ML18024A920 | 26 July 1979 | LER 79-008/03L-0 on 790627:no Speed Indication Noted on Reactor Core Isolation Coolant.Caused by Broken Wires to Magnetic Pickup EG-M Box.Wires Repaired | |
| ML18024A923 | 27 July 1979 | LER 78-022/03L-1 on 781202:during Normal Operation,Reactor Bldg,Turbine Bldg & Refueling Zone Ventilation Exhaust Monitor RM-90-250 Became Inoperable.Caused by Collection of Moisture in Sampling Line of Monitor.Sampling Line Dried | |
| ML18024A927 | 30 July 1979 | LER 79-014/03L-1 on 790526:while in Cold Shutdown for Refueling,Local Leak Rate Testing Revealed That Total Leak Rate Exceeded Allowable 60%.Caused by Deterioration of Valve Seats on Main Steam Sys.Valves Repaired |