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{
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	Issue date	Title	Topic
ML17053A239	14 November 1978	LER#78-038/03L-0 on 781025:review of N1-ISP-RE22 Test Results Found 12 Instances Where Procedure Was Violated. Caused by Carelessness in Procedure Implementation. Re-instruction & Closer Supervision Instituted
ML17059C101	24 June 1998	LER 98-014-00:on 980525,noted Differences Between Actual Valve Weights & Weights Shown on Engineering Drawings.Caused by Vendor Failing to Provide Accurate Valve Weights.Revised Valve Drawings & Associated Calculation,Per 10CFR21	Time of Discovery
ML17341B665	5 August 1982	LER 82-011/03L-0:on 820802,oil Leak on Fuel Oil Supply Manifold Discovered on Diesel Fire Pump.Caused by Defective Braze Joint.Leak Repaired by Manufacturer
ML18004C006	13 April 1987	LER 86-002-01:on 861104,procedure N2-OSP-RMC-W0002 Ran for Over 2 H Thereby Violating Tech Specs.Caused by Personnel Error & Procedure Deficiency.Temporary Change Notice Issued to procedure.W/870413 Ltr
ML18037A141	8 December 1978	LER#78-040/03L-0 on 781113:#112 Core Spray Topping Pump Motor Breaker Closed Starting Pump But Breaker Closing Spring Motor Was Running Continuously & Not Charging Closing Spring.Caused by Misaligned Motor Assembly at Latching Pawl
ML18037A149	28 December 1978	LER 78-041/04T-0 on 781220:during Impingement Sampling Only 23 Samples (22 Hourly Samples & One 2-hr Sample) Were Collected Instead of 24 Required Samples,Caused by one-time Personnel Scheduling Change
ML18037A163	13 March 1979	LER 79-001/03L-0 on 790218:during Performance of Surveillance,Test Flow Comparator 11 Did Not Produce Rod Block within Required Tolerance.Caused by Defective Rod Comparator.Component Replaced & Setpoint Left at 14%
ML18037A164	20 March 1979	LER 79-002/01T-0 on 790306:during Inservice Insp of Emergency Condenser Steam Supply Line,Six Reportable Indications Found.Caused by Intergranular Stress Corrosion Cracking.Elbow & safe-end Will Be Replaced
ML18037A166	23 April 1979	LER 79-002/01X-1 on 790306:during Refueling Outage While Preparing Emergency Condenser Steam Nozzle 5-NB for Replacement of safe-end,discovered Inconel Weld Was Removed from Nozzle.New Safe End Installed
ML18037A167	1 May 1979	LER 79-005/03L-0 on 790401:during Periodic Type C Leakage Test,Valves IV-68-06,IV-201-09,IV-201-10 & IV-58.1-02 Were Found to Be in Excess of Tech Specs.Cause Unknown.Repairs Will Be Made During Outage
ML18037A169	23 May 1979	LER 79-010/03L-0 on 790424:during Refueling Outage, Containment Vacuum Relief Valve 68 IV-10 Flange Failed Leak Rate test.O-rings Replaced on Flange
ML18037A172	31 May 1979	LER 79-008/03L-0 on 790510:during Refueling Outage, Containment Spray Heat Exchangers 112 & 121 Failed Leak Rate Test.Caused by Tube Leaks.Tubes Plugged
ML18037A173	31 May 1979	LER 79-009/03L-0 on 790510:during Refueling Outage,Site Operations Review Committee Failed to Review Temporary Change to Maint Procedure N1-MP-7.11 within 7-day Limit. Change Subsequently Reviewed
ML18037A174	31 May 1979	LER 79-012/01T-0 on 790523:concrete Anchor Bolt Deficiencies & Missing Seismic Restraints Were Discovered on Class I Seismic Piping Sys.Caused by Incorrect Installation.Concrete Anchor Bolt Repair Program Will Be Completed by 791231
ML18037A176	14 June 1979	LER 79-014/03L-0 on 790319:during Refueling Outage,Core Spray Sys Snubber 40-HS-10 Found Inoperable.Caused by Worn Piston Seals on Core Spray Snubber Resulting in Loss of Fluid from Snubber.Seals Replaced & Snubber Reinstalled
ML18037A177	14 June 1979	LER 79-011/03L-0 on 790517:during Refueling Outage, Discovered That Radiographer Received Overexposure of 3,790 Millirems for Second Quarter 1979.Cause Unknown & Under Investigation.Discussed Further in 790615 Ltr to NRC
ML18037A181	9 July 1979	LER 79-016/03L-0 on 790626:failure to Review Temporary Electrical Maint Procedure within Seven Days.Review Made & Approvals Received
ML18037A182	9 July 1979	LER 79-017/03L-0 on 790612:containment Spray Water Intertie Valves Leaked Causing Failure of Integrated Leak Rate Test. Valves Removed,Cleaned & re-installed
ML18037A188	10 August 1979	LER 79-018/03L-0 on 790726:vacuum Relief Sys Switch 68-12B Failed to Open at Proper Setpoint.No Cause Identified.Switch Adjusted to Proper Setpoint
ML18037A194	7 September 1979	LER 79-021/04T-0:on 790905,noted That Analysis of Excesssive Nuclide Water Sample Concentrations Was Not Completed within 30 Days.Caused by Late Rept by Contractor & High Influx of Samples.Addl Personnel Added
ML18037A197	10 September 1979	LER 79-019/03L-0:on 790816,during Steady State Operation, Routine Mgt Review Disclosed Failure to Complete Five Surveillance Tests on Schedule.Tests Immediately Performed & Completed.Personnel Instructed to Follow Published Schedule
ML18037A198	10 September 1979	LER 79-020/03L-0:on 790901,during Steady State Operation, Drywell Cooler 14 Tripped & Leakage Increased to Above Five G/Minute.Caused by Cooler Tube Leak.Cooler Isolated & Returned to Acceptable Level.Shutdown Terminated
ML18037A203	19 September 1979	LER 79-013/03L-1:on 790525,during Refuelling Outage,Three Instrument Surveillance Procedures Were Implemented Before Required Temporary procedure-change Signatures Were Obtained.Cause Not Stated
ML18037A204	1 October 1979	LER 79-022/01T-0:on 790918,noted Failure to Install Seismic Constraint on Containment Spray Sys Outside Primary Containment Per Const Drawings.Initiated Design & Order to Install Constraint.Containment Spray Loop Inoperable
ML18037A207	2 November 1979	LER 79-023/03L-0:on 791004,cooling Water Pump of Diesel Generator 103 Tripped.Caused by Burned Contacts in Breaker. Breaker Repaired & Pump Started Manually.Preventative Maint Procedure Will Be Revised
ML18037A209	19 November 1979	LER 79-025/03L-0:on 791027,during Surveillance Testing, Personnel Unable to Zero Side Average Power Range Monitor Flow Converter 11.Caused by Component Failure.Entire Unit Replaced & Problem Eliminated
ML18037A233	16 January 1980	LER 80-002/04L-0:on 800109,during Steady State Operation, Review of Differential Recorder Revealed Condenser Inlet/ Screenwell Discharge Differential Temp Went Over Established Limits.Caused by Instrument Malfunction
ML18037A235	10 January 1980	LER 80-001/03L-0:on 800102,during Steady State Operation, Calculations Determined Planar Linear Heat Generation Rate Exceeded Tech Specs.Cause Unknown.Power Decreased. Calculation Revealed Heating Generation Rate within Limits
ML18037A236	21 January 1980	LER 80-003/01T-0:on 800109,lab Analysis Not Performed on Charcoal Filter Samples from Rx Bldg & Control Room Emergency Ventilation Sys Per Tech Specs.Caused by Change in Operating Cycle Length.Will Revise Surveillance Schedule
ML18037A240	15 February 1980	LER 80-005/01X-0:on 800203,engineering Evaluation of GE SIL 299 Required That low-low Setpoint for Reactor Core Water Level Be Raised 20 Inches.Caused by Efforts to Precisely Measure Actual to Indicated Water Level Difference
ML18037A241	20 February 1980	LER 80-006/04L-0:on 800123-24,condensor Inlet/Circulating Water Discharge Temp Exceeded Tech Spec Limit.Following Flow Reversal,Discharge Temp Exceeded Lake Ambient by More than Tech Spec Limit.Caused by Instrument Failure
ML18037A243	20 March 1980	LER 80-007/03L-0:on 800303,while Shutdown for Maint,Attempts to Close Both Air Operated Outside Main Steam Isolation Valves Failed.Caused by Rust Buildup in Pilot Shuttle.New Instrument Air Sys Is Being Installed
ML18037A245	20 March 1980	LER 80-008/03L-0:on 800315,during Steady State Operation, Alarm in Control Room Signaled Loss of Flow to Stack Gas Sampling Sys.Caused by Stack Sample Flow Inlet Valve Failing Closed,Due to Arcing Relay Contacts	Grab sample
ML18037A262	3 June 1980	LER 80-010/03L-0:on 800528,while Performing Valve Checks, Operator Discovered Cardox Tank Pressure Below Tech Spec Limits.Caused by Delivery of Too Low Temp Carbon Dioxide by Supplier.Low Pressure Alarm Connected
ML18037A263	3 June 1980	LER 80-009/03L-0:on 800521,during Steady State Operation, Attempts to Stroke 122 Containment Spray Isolation Valve Failed.Caused by Isolation Valve Solenoids Being Dirty. Revising Procedures to Require Periodic Maint for Valve
ML18037A276	22 July 1980	LER 80-011/04L-0:on 800623,recorder Review Showed Condenser Inlet/Circulating Water Discharge Delta Temp Had Exceeded Tech Spec Limit on 800620-23.Station Load Reduced,Recorder Scale Expanded & Tech Spec Change Initiated
ML18037A278	1 August 1980	LER 80-012/03L-0:on 800419,during Surveillance Testing of Turbine Anticipatory Trip Bypass,Rx Scram Switch 02-13A Was Operating Outside Setpoint.Caused by Instrument Drift.Switch Readjusted & Will Be Tested Monthly
ML18037A281	8 August 1980	LER 80-014/03L-0:on 800717,during start-up Performance for IE Bulletin 80-17 Auto Scram Test,Operability Test Attempted on Valve During Shutdown Period.Valve Failed to Open Upon Manual Initiation.Valve Removed & Disassembled
ML18037A283	18 August 1980	LER 80-015/04L-0:on 800804,during Steady State Operation, Offgas Monitoring Sys Inadvertently Placed in Purge Mode of Operation.Caused by Technician Error.Sys Returned to Normal Operating Mode,Restoring Sys Operability
ML18037A289	9 September 1980	LER 80-019/04T-0:on 800827,during NRC Insp at Normal Operation,Discovered Removable Bottom Door Seals of Outer Door of Reactor Bldg Track Bay Were Not Installed Properly. Caused by Personnel Error
ML18037A291	29 September 1980	LER 80-020/03L-0:on 800830,while Experiencing Electrical Storm During Normal Operation,Loss of Meteorological Data Transmission to Control Room Instruments Occurred.Caused by Transceiver Failure.Transceiver Repaired & Returned to Svc
ML18037A295	20 October 1980	LER 80-023/03L-0:on 800922,111 Absolute Filter Access Cover Was Found Off Housing.Caused by Residual Pressure in Containment Nitrogen Inerting Line Pressurizing Filter Housing When Torus Venting Initiated.Cover Reinstalled
ML18037A296	24 October 1980	LER 80-022/03L-0:on 800927,low Power Range Monitor Detector Failed Rendering Average Power Range Monitor 18 Inoperable. Caused by Internal Shorting.Low Power Range Monitor Will Be Replaced During Next Refueling
ML18037A298	30 October 1980	LER 80-024/03L-0:on 800930,during Audit,Discovered That Point Valve Was Not Recorded on 790721 Instrument Surveillance Test for Drywell High Pressure Trip Sys.Caused by Personnel oversight.Two-level Review Instituted
ML18037A305	5 September 1980	LER 80-018/03L-0:on 800808,during Normal Operation, Emergency Diesel Generator 103 Fuel Oil Day Tank Low Level Alarm Was Received.Caused by Inadvertent Opening of Day Tank Drain Valve.Tank Refilled.Oil Valve Sys Locked
ML18037A307	2 December 1980	LER 80-026/01T-0:on 801118,input Error Discovered Which Resulted in Reduction in Calculated Pressure Margin to Reactor Safety Valve Setpoints During Possible Transients
ML18037A309	24 November 1980	LER 80-025/03L-0:on 801028,stack Gas Monitoring Sys Rendered Inoperable When Inadvertently Left in Purge Operation Mode for 9.5-h.Caused by Technician Failing to Return Sys to Normal Operation.Monitor Returned to Operation
ML18037A312	26 December 1980	LER 80-027/03L-0:on 801126,operability Tests Were Not Immediately Performed as Required.Caused by Misunderstanding of Intent of Procedure.Testing Performed
ML18037A313	29 December 1980	LER 80-028/04T-0:on 801215,results of 801103,26 & 1201 Milk Sample Tests Showed Detectable I-131 at Three Locations. Caused by Chinese Nuclear Weapons Test During Oct.Plant Not Accountable for Detected Levels
ML18037A314	30 December 1980	LER 80-031/01T-0:on 801216,feedwater Flow Control Valve Pneumatic Positioner Unit II Vented Excessive Amount of Air. Caused by Cracked & Worn Rubber Goods.Rubber Goods Replaced & Retested

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