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	Issue date	Title	Topic
ML19260D641	31 January 1980	LER 80-001/03L-0:on 800104,high Pressure Safety Injection Loop 12A Stop Would Not Move to Throttled Position.Caused by Loose Termination on One Electrical Lead Terminating at Valve Torque Switch.Terminal Screw Tightened
ML19260D654	31 January 1980	LER 80-006/03L-0:on 800103,while Performing Routine Surveillance Test,Control Element Assembly 60 Was Dropped Into Core.Cause Unknown.All Parameters Found Normal & No Problems Encountered.No Further Action Anticipated
ML19260D975	7 February 1980	LER 80-002/03L-0:on 800107,refueling Water Tank Narrow Range Level Indicator Was in Alarm W/Low Level,But Instrument Did Not Indicate Alarm Conditions.Caused by Faulty Indicator Alarm light-emitting Diode.Diode Replaced
ML19260D995	7 February 1980	LER 80-003/03L-0:on 800108,during Routine Containment Air Lock Surveillance,Emergency Escape Lock Leakage Found Greater than Allowed.Caused by Excessive Leaking of Packing Glands for Doors Handwheels.Packing Tightened
ML19261A561	22 January 1979	LER 79-003/01X-0 on 790120:22A Radiological Control Program Lower Seal Temp Alarm & 2 Gal Per Minute Increase in RCS Leak Rate Resulted in Manually Tripping of Reactor.Cause of Event Will Be Discussed in Followup Rept
ML19261A814	1 February 1979	LER 79-003/01T-0 on 790120:during Normal operation,22A Lower Seal Temp Alarm Was Received & RCS Leak Rate Increased. Caused by Cracked Weld on 22A Lower Seal Pressure Sensing Line.Design Change Is in Progress
ML19261B488	22 February 1979	LER 79-005/03L-0 on 790129:during Operation,Flow Transmitter Output Was Found Pegged High & Was Bypassed.Caused by Packing Leak in Transmitter Equalizing & Reference Leg Isolation Valves	Packing leak
ML19261B842	1 March 1979	LER 79-004/03L-0 on 790216:saltwater Pump Discharge Check Valve Failed to Open When Started.Caused by Foreign Debris Lodged Against Disc.Valve Will Be Monitored Closely During Future Operation to Ensure Problem Is Eliminated
ML19261D770	21 June 1979	LER 79-018/03L-0 on 790527:4 Kv Feedwater Breaker 152-2401 Tripped Open Causing Loss of Power to 4 Kv Bus 24.Caused by Spurious Signal or Momentary Loss of Power to ESFAS Zb Logic Cabinet 2C68L.No Further Action Required
ML19261D814	21 June 1979	LER 79-019/03L-0 on 790525:during Performance of Surveillance Testing,Engineered Safety Features Actuation Sys Module SIAS B-8 Failed to Actuate at 1,730.Cause Unstated.Module Replaced
ML19261E536	23 August 1979	LER 79-030/03L-0 on 790728:water Leak Discovered on Discharge Isolation Valve of Reactor Coolant Charging Pump. Caused by Cracked Repair Weld on Discharge Isolation Valve. Weld Repaired Using Gas Tungsten Arc Process
ML19263A716	21 December 1978	LER 78-044/03L-0 on 781203:reactor Protection Sys Channel C T-cold Was Erratic & Read Approx 4 F Higher than Pressure Other Channels.Caused by Bad Delta T-thermal Margin/Low Pressure Calculator Mode Switch
ML19263C394	12 February 1979	LER 79-001/01X-0 on 790209:during Normal Operation, Determined That License Submittal for Operation at 2,700 Mwt Failed to Indicate That Credit for One Charging Pump Was Taken in Small Break LOCA Analysis.Cause Forthcoming
ML19263D372	22 March 1979	LER 79-006/03L-0 on 790304:reactor Coolant Sys Leakoff Plug CVC-515-CV Was Leaking.Caused by Natural End Life of Valve Packing.Packing Adjusted & Leakoff Line Capped
ML19269D531	9 January 1978	LER 78-001/03L-0 on 771210:azimuthal Power Tilt Exceeded Tech Specs Limits.Caused by Positive Bias Being Estimated Slightly Below Value of 0.020.Proposed Tech Spec Change Submitted to Permit Use of Addl Incore Detector Segments
ML19269D569	26 September 1978	LER 78-030/03L-0 on 780828:discovered Control Element Assembly Motion Inhibit Not Operable for Position Deviation. Caused by Bad K2 Relay on Relay Card.Relay Replaced & Motion Inhibit Returned to Svc
ML19269D602	25 May 1979	LER 79-015/03L-0 on 790519:containment Air Lock Outer Door Air Leakage Discovered to Be in Excess of Tech Spec Limits. Caused by Failed Door Gasket.New Gaskets Installed & Door Latch Rollers Adjusted
ML19270E897	27 December 1978	LER 78-054/01T-0 on 781213:during Routine Trip Recovery, Reactor Was Made Critical,But Shift Supervisor Recalled That No 11 Component Cooling Heat Exchanger Was Out of Svc & the Saltwater Subsys Partly Drained,So Reactor Was Shut Down
ML19270G039	25 May 1979	LER 79-016/03L-0 on 790520:while Inserting Group 5 Control Element Assemblies,Cea 36 Dropped to Bottom of Core.Caused by Spike in 15 Volt Power Supply.Design Mod to Be Installed During Next Refueling Outage
ML19270G409	31 May 1979	LER 79-017/03L-0 on 790520:during Surveillance Testing, Diesel Generator 21 Failed to Start Upon Actuation of Remote Start Switch.Caused by Normally de-energized Low Speed Relay Being Energized During Initial Test
ML19270H238	19 June 1979	LER 79-020/03L-0 on 790602:during Safety Injection Tank Maint,Safety Injection Tank 22B Decreased to 186 Inches at 1730.Caused by Seat Leakage on 22B Safety Injection Tank Exceeding Leaking Expectations.Valve Will Be Repaired
ML19270H477	17 August 1979	LER 79-025/03L-0 on 790719:reactor Protection Sys Channel a T-cold Input Fluctuated.Cause Suspected to Be Intermittently Open Temp Element or Connection at Element. Repairs Implemented
ML19270H478	17 August 1979	LER 79-027/031-0 on 790718:channel C Trips Were Received from Power Level,Thermal margin-low Pressure & Axial Flux Offset.Cause of Intermittent Problem Is Suspected to Be Loose Connection or Faulty Switch Circuit
ML19273A998	24 January 1979	LER 79-001/03L-0 on 790106:excessive Reactor Coolant Sys Unidentified Leakage.Caused by Cracked Weld on Socket Weld Downstream of Second Isolation Valve.Study Planned to Propose Design Changes to Correct Fatigue Problem
ML19274D218	11 January 1979	LER 78-051/03L-0 on 781212:during Normal Operation,The Containment Atmosphere Sampling Pump Tripped,Rendering Both Particulate & Gaseous Radioactivity Monitors Inoperable. Caused by Failed Pump Bearing
ML19274D559	4 January 1979	LER 78-056/04T-0 on 781221:oyster Samples Showed AG-110m at 81 Plus or Minus 11% Pci/Kg & Background Location Ag-110m at Less than 7 Pci/Kg.More Sensitive Technique Has Reduced MDL Value from 40 Pci/Kg,But New Background Value Is Exceeded
ML19274F036	4 June 1979	LER 79-015/03L-0 on 790507:low Pressure Safety Injection Pump Stopped for 15 Minutes Due to Spurious Recirculation Actuation Signal.Caused by Voltage Transient.Test Procedures Revised
ML19275A045	17 August 1979	LER 79-031/01X-0 on 790731:during Normal Operation,Logic Circuit a Would Not Initiate When Power Supplies to Actuation Cabinet Drawers Were Deenergized.Cause Under Investigation
ML19275A273	28 September 1979	LER 79-034/01T-0:on 790914,noted That Air Start Sys Hangers Not Built to Meet Seismic Requirements.Caused by Error Classifying Lines as Nonseismic.Installation of Seismic Pipe Supports Upgraded Diesel Starting Air Sys
ML19276F394	22 March 1979	LER 79-009/03L-0 on 790226:svc Water Heat Exchanger Saltwater Outlet Throttle Valve 21 Failed to Open on Signal.Cause Unknown.Valve Will Be Repaired During Next Outage
ML19276G924	17 August 1979	LER 79-027/03L-0 on 790719:metrascope Position of Control Element Assemblies Was Lost.Caused by Faulty Metrascope Power Supply.Faulty Components Replaced,Setpoints Calibr & Alarms Cleared
ML19276H671	13 December 1979	LER 79-069/03L-0:on 791127,during Steady State Operation, Diesel Generator 11 Was Removed Form Svc.Caused by Need to Repair Generator Fuel Oil Injector Supply Line.Line Replaced & Diesel Returned to Svc.Leak Marked for Future Ref
ML19281A272	1 March 1979	LER 79-006/03L-0 on 790204:control Element Assembly Motion Inhibit Failed to Actuate within Tech Spec Limits.Caused by Bad K2 Relay on Relay Card.Relay Replaced & Inhibit Returned to Svc
ML19282B160	1 March 1979	LER 79-007/03L-0 on 790212:snubber 2-83B-2,21 Main Steam Isolation Valve Hydraulic Supply Sys,Inoperable.Caused by Slightly Bent Piston Rod.Snubber Replaced
ML19282B164	1 March 1979	LER 79-005/03L-0 on 790218:azimuthal Power Tilt Exceeded Tech Spec Max.Caused by Dropped Control Element Assembly. Corrective Action Detailed in LER 79-003/03L-0 Unit 1
ML19282C173	14 March 1979	LER 79-007/04T-0 on 790228:sulfuric Acid Was Discharged Onto Ground Via Storm Drains Near Storage Tank.Caused by Pipe Weld Failure.Spill Isolated & Contained,Leak Located & Welded
ML19289C414	5 January 1979	LER 78-055/03L-0 on 781209:water Leak from Cracked Weld on No 11 Reactor Coolant Charging Pump Discharge Isolation Valve Noted.Caused by Seal Weld Failure on Gate Valve
ML19289D362	23 February 1979	LER 79-001/01T-0 on 790209:found That License Submittal for Operation at 2,700 Mwt Failed to Indicate Credit for One Charging Pump Was Taken in Small Break LOCA Analysis. Reanalysis Concluded That 2,700 Mwt Was Safe Level
ML19289E914	17 May 1979	LER 79-016/03L-0 on 790421:one of Eight Main Steam Safety Valves Tested Found Out of Tolerence in Conservative Direction.Caused by Difference in Ambient Conditions Between Time When Valve Last Reset & Time of Test
ML19289F382	31 May 1979	LER 79-018/04T-0 on 790517:oyster Samples Showed Ag-110m at 88 Plus or Minus 5% Pci/Kg & Decreasing.May Be Caused by Depuration.No Corrective Action Required
ML19290B701	10 December 1979	LER 79-066/03L-0:on 791120,containment Cooler 12 Taken Out of Svc to Repair Sticking Fan Motor Controller Handswitch. Cause Not Stated.Spring Tension on Switch Handle Adjusted
ML19290C278	4 January 1980	LER 79-047/03L-0:on 791204,while Performing post-refueling Low Power Physics Test,Average Temp Dropped Below Tech Specs.Caused by Operator & Erratic Control of Turbine Bypass Valves
ML19290D005	8 February 1980	LER 80-004/03L-0:on 800110,low Flow Alarm Received for Containment Particulate & Gaseous Radiation Monitor Sys. Caused by Gasket Leakage at Particulate Detector Sample Psig.Gaskets Replaced & Flow Restored to Normal
ML19290E232	29 February 1980	LER 80-007/03L-0:on 800130,while Performing Routine Surveillance Testing,Discovered Control Element Assembly 54 Would Not Drive Down Electrically.Cause Not Known.Rod Became Operable During Investigation of Rod Circuitry
ML19290F018	7 March 1980	LER 80-011/03L-0:on 800208,W/RCS at 130 Degrees & 250 Psia, Shutdown Cooling Suction Header Relief Valve Lifted & Failed to Reset.Caused by Valve Being Left at Improper Relief Pressure Due to Error Following Testing
ML19291A868	23 August 1979	LER 79-028/03L-0 on 790724:while Operating Diesel Generator 11 for Troubleshooting,Smoke Was Noted Coming from Exciter Control Cabinet 1C61C.Caused by Grounded Primary Winding in Exciter Potential Transformer T-54
ML19294A440	2 November 1978	LER#78-034/03L-0 on 781023: in Mode 3 at 500F,12 Main Steam Safety Valve Relief Set Points Were Outside Tolerances of TS 4.7.1;all Were Adjusted & Setpoints Returned to Spec
ML19294A805	18 February 1979	LER 79-003/03L-0 on 790218:control Element Assembly 44 Cropped to Bottom of Core & Could Not Be Withdrawn.Reactor Power Reduced to Below 70%.Caused by Loose Connection on Terminal 21 of Coil Power Programmer.Connection Tightened
ML19294B745	29 February 1980	LER 80-009/03L-0:on 800131,while Conducting Routine Test, Control Element Assembly (CEA) 32 Dropped Into Core.Cause Unknown.Technician Will Be Assigned During Next STP 0-29 to Monitor Operating Parameters of All CEAs on real-time Basis
ML19294B759	3 March 1980	LER 80-012/03L-0:on 800211,while Performing Routine Surveillance Test,Control Element Assembly (CEA) 35 Dropped Into Core.Cause Unknown.Technician Will Be Assigned to Monitor Operating Parameter of All CEAs During Next STP

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