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| Issue date | Title | Topic | |
|---|---|---|---|
| ML20029D020 | 25 April 1994 | LER 94-007-01:on 931014,high Head Safety Injection Flow Balance Testing Found to Be Below TS Requirement.Caused by Unaccounted for Uncertainties.Cold Leg Safety Injection Leg Throttle Valve adjusted.W/940425 Ltr | Enforcement Discretion Loctite |
| ML20045G939 | 8 July 1993 | Lr 93-017-00:on 930616,containment Hydrogen Analyzer Heat Trace Channel Calibration Not Performed on Staggered Test Basis Due to Inadequate Implementation of TS Amend.Test Procedure Satisfactorily performed.W/930708 Ltr | |
| ML20044H159 | 27 May 1993 | LER 93-016-00:on 930509,discovered That Containment Hydrogen Analyzer Pressure Switch PS-3 Sensing Line Disconnected in Local Panel.Caused by Personnel Error. Pressure Switch Calibr & Line reconnected.W/930527 Ltr | Post Accident Monitoring |
| ML20044D571 | 14 May 1993 | LER 93-002-00:on 930416,automatic Reactor Trip Initiated from Turbine Trip Due to Over Excitation of Main Generator. Emergency Procedure 2-E-0 Entered & Individuals Involved in Event Received Remediated training.W/930514 Ltr | |
| ML20044D228 | 12 May 1993 | LER 93-003-00:on 930424,manual Reactor Trip Initiated Due to Erratic Feedwater Flow Indications to SG C & Excessive Main Feedwater Regulating Valve Oscillations.Caused by Design Instabilities.Secondary Sys secured.W/930512 Ltr | |
| ML20044C954 | 7 May 1993 | LER 93-015-00:on 930427,discovered That Portions of Containment Pressure Channels That Input to Containment Spray hi-hi Pressure Not Tested Monthly.Caused by Personnel Error.Test Procedures changed.W/930507 Ltr | Missed surveillance |
| ML20044C981 | 6 May 1993 | LER 93-014-00:on 930411,as-found Speed Setting of Steam Driven AFW Pump 1-FW-P-2 Found Below Required TS Limit. Caused by Incorrect Speed Control Setting.Pump Speed Adjusted & Maint Personnel counseled.W/930506 Ltr | |
| ML20024G684 | 18 April 1991 | LER 91-006-00:on 910403,discovered That Ac Offsite Power Source Surveillance Not Performed Due to Personnel Error. Surveillance Initiated Immediately & Positive Discipline Administered to supervisor.W/910418 Ltr | Missed surveillance |
| ML20029B560 | 6 March 1991 | LER 91-005-00:on 910209,containment Building Penetrations Breached.Caused by Inadequate Procedural Controls.Core Mapping & Cavity Pump Down Activities Secured,Air Hose Removed & Hydrolase Hose capped.W/910306 Ltr | Time of Discovery |
| ML20029A647 | 22 February 1991 | LER 91-004-00:on 910206,sealed Radioactive Source in Storage Not Leak Tested Prior to Use.Caused by Inadequate Procedures for Verifying Leak Testing of Sources.Procedures Revised.W/ 910222 Ltr | Missed surveillance |
| ML20028H668 | 18 January 1991 | LER 90-009-01:on 900719,discovered That Response Time Testing of Pressurizer High Level Reactor Trip Function Not Performed in Accordance W/Tech Spec 3.3.1.1,Table 3.3-2. Caused by Personnel Error.Procedures revised.W/910118 Ltr | |
| ML20043H832 | 22 June 1990 | LER 90-007-00:on 900523,discovered That Two Sets of Concrete Roof Blocks on Svc Water Pump House Not in Required Safety Position.Caused by Lack of Administrative Controls.Blocks Restored to Required locations.W/900622 Ltr | Tornado Missile Tornado Missile Protection |
| ML20043D580 | 4 June 1990 | LER 90-006-00:on 900504,casing Cooling Pump Not Put Into Alert Status & Surveillance Missed.Caused by Personnel Error.Pump 1-RS-P-3B Placed in Alert status.W/900604 Ltr | Missed surveillance |
| ML20012E330 | 27 March 1990 | LER 90-003-00:on 900228,52 Valves Identified Not Included in Tech Spec Required Monthly Containment Integrity Verification Surveillance Program.Caused by Personnel Error & Inadequate Procedure.Procedure revised.W/900327 Ltr | Stroke time Missed surveillance |
| ML20012B644 | 8 March 1990 | LER 90-001-00:on 900215,inadvertent Partial Train a ESF Actuation of Containment Depressurization Sys Occurred. Caused by Human Error.Evaluation to Be Performed to Determine If Test Points Can Be moved.W/900308 Ltr | |
| ML20006E237 | 8 February 1990 | LER 90-001-00:on 900123,reactor Trip Occurred on Steam Feedwater Flow Mismatch.Caused by Failed Circuit Driver Card on Feedwater Regulating Valve.Feedwater Regulating Valve Driver Card replaced.W/900208 Ltr | Reserve Station Service Transformer |
| ML20006E377 | 5 February 1990 | LER 90-002-00:on 900127,fuel Bldg Ventilation Sys Not Aligned to Discharge Through Auxiliary Bldg HEPA Filter & Charcoal Adsorber Assembly During Fuel Movement.Caused by Personnel Error.Disciplinary Action taken.W/900205 Ltr | |
| ML20006A853 | 19 January 1990 | LER 89-019-00:on 891228,discovered That Outer Door of Containment Equipment Escape Air Lock Was Drawing in Air & Inner Door Noted as Not Being in Fully Closed Position.Cause Undetermined.Sys Enhancements Being evaluated.W/900119 Ltr | |
| ML20005F878 | 11 January 1990 | LER 89-018-00:on 891219,determined That Three Pressurizer Pressure Safety Injection Instrumentation Channels May Not Have Adequate Margin Between Actuation Setpoint & Bottom of Instrument span.W/900111 Ltr | |
| ML19332D547 | 22 November 1989 | LER 85-003-03:on 890907,determined That Situation Could Arise Where Water Level Would Rise to 264 Ft Before Next Required Surveillance Interval.Cause Not Determined.Dike to Be constructed.W/891122 Ltr | |
| ML20024B782 | 6 July 1983 | LER 83-048/03L-0:on 830606 & 17,intermediate Range Channels N35 & N36 High Neutron Flux Reactor Trip Setpoints Exceeded Tech Spec Requirements.Caused by Administrative Error. Setpoints reduced.W/830706 Ltr | |
| ML20024C136 | 30 June 1983 | LER 83-031/03L-0:on 830614,w/unit at 100% Power,Fire Door S54/5 from Emergency Switchgear Room to Cable Vault Would Not Latch.Fire Watch Posted Immediately.Caused by Misaligned Strike.Door Repaired within 1 h.W/830630 Ltr | Fire Watch |
| ML20024C372 | 30 June 1983 | LER 83-042/03L-0:on 830606,vital Bus 1-I Momentarily Deenergized While Trying to Clear Inverter Trouble Alarm. Caused by Operator Error.Bus energized.W/830630 Ltr | |
| ML20024B989 | 28 June 1983 | LER 83-047/03L-0:on 830530,emergency Diesel Generator 2J Tripped on High Crankcase Pressure During Surveillance Testing.Cause Not Determined.Diesel Tested Satisfactorily. W/830628 Ltr | |
| ML20024C294 | 23 June 1983 | LER 83-044/03L-0:on 830526,during Mode 3,one Recirculation Valve on Each of Two Casing Cooling Pumps Found Open.Caused by Procedure Inadequacy.Valves Closed Immediately.Maint Procedure Will Be revised.W/830623 Ltr | |
| ML20024C307 | 22 June 1983 | LER 83-034/03L-0:on 830525,during Mode 1,one Header of Control Room Bottled Air Pressurized Sys Had Lower than Required Pressure.Probably Caused by Leak from B Bank of Air Bottles.Header repressurized.W/830622 Ltr | |
| ML20024C097 | 22 June 1983 | LER 83-045/03L-0:on 830614,Fire Door S71-18,between Emergency Diesel Generator Room 2H & Turbine Bldg,Would Not Latch & Lock.Caused by Stuck Latch.Latch Adjusted & Lubricated.Door Designs modified.W/830622 Ltr | Fire Watch |
| ML20023E095 | 1 June 1983 | LER 83-027/03L-0:on 830505,one Header (42 Bottles) of Control Room Bottled Air Pressurized Sys Found to Have Lower than Required Pressure (2,290 Vs 2,300 Psig).Probably Caused by Leakage When Compressor malfunctioned.W/830601 Ltr | |
| ML20023E072 | 26 May 1983 | LER 83-029/03L-0:on 830509,following Rapid Rampdown from 100% to 4% power,I-131 Dose Equivalent Exceeded 1.0 Uci/G. Caused by Unidentified Fuel Element Defect Worsened by post-rampdown Conditions.Sampling increased.W/830526 Ltr | |
| ML20023D537 | 13 May 1983 | LER 83-022/03L-0:on 830412,review of ASME XI Iwv Program Identified 192 Valves Not Exercised &/Or Stroke Timed.Caused by Fragmented Implementation of Testing Program.Programs Upgraded | Stroke time |
| ML20023D249 | 11 May 1983 | LER 83-032/03L-0:on 830412,during Mode 5,visual Insp of Hydraulic Snubber 2-WGCB-HSS-3B Revealed Damaged Reservoir W/O Fluid.Caused by Personnel Working in Area.Snubber Replaced | |
| ML20023C537 | 10 May 1983 | LER 83-021/03L-0:on 830411,Fire Door S-71-7 Between Svc Bldg Health Physics Area & Auxiliary Bldg Would Not Self Close.Caused by Removal of Reclosure Device for Maint of Closure Coupling.Reclosure Device Reinstalled | Fire Barrier Fire Watch |
| ML20023B593 | 27 April 1983 | LER 83-029/03L-0:on 830402,during Mode 4,automatic Actuation of ECCS Occurred.Caused by Maint Personnel Standing on Conduit Resulting in Loss of lo-lo Pressurizer Pressure Safety Injection Block.Maint Personnel Reinstructed | |
| ML20023B570 | 27 April 1983 | LER 83-008/03L-0:on 830410,review Revealed That Procedure Used to Restore Boron Injection Tank Concentration Introduced Potential Unanalyzed Injection Flow Diversions. Caused by Oversight.Emergency Procedures Revised | Boric Acid |
| ML20028G654 | 9 February 1983 | LER 83-003/03L-0:on 830122,during Mode 5,RHR Flow Was Lost for 4 Minutes.Caused by Failure of 15 Kv a Inverter to Ac Vital Bus 1-III,de-energizing Auxiliary Relay for Pressure Channel P-1403.Vital Bus 1-III & RHR Flow Restored | |
| ML20028G631 | 9 February 1983 | LER 83-016/03L-0:on 830115 & 16,both Open & Closed Containment Isolation Valves TV-SI-200 & TV-CC-204C,train a Position Indication Lights Found Lit.Caused by Leaking Steam Generator Chemical Feed Line Vent Valve | |
| ML20028G078 | 31 January 1983 | LER 83-001/03L-0:on 830112,primary Grade Water Isolation Valve to Blender 1-CH-217 Remained Open Longer than Tech Spec Requirements.Caused by Personnel Error.Responsible Operator Reinstructed | |
| ML20028G038 | 28 January 1983 | LER 83-002/03L-0:on 830104,two of Four 2H Emergency Diesel Generator Surveillance Tests Required by Tech Spec Missed During Nov-Dec 1982.Caused by Scheduling Error.Test Frequency Increased to Meet Tech Spec Requirements | Missed surveillance |
| ML20028G013 | 28 January 1983 | LER 83-011/03L-0:on 821119,individual Rod Position Indication Deviated from Group Demand Position by Greater than 12 Steps.Caused by Instrument Drift.Indicator Channel for Rods B-09 & 02 & F-06 Recalibr | |
| ML20028F350 | 19 January 1983 | LER 83-008/03L-0:on 830107,during Mode 3,individual Rod Position Indication Deviated from Group Demand Position by Greater than 12 Steps While Withdrawing Shutdown Bank B. Caused by Instrument Drift.Rods Recalibr | |
| ML20028E039 | 11 January 1983 | Updated LER 82-079/03X-1:on 821126,flow Path from Boric Acid Tanks to RCS Found Inoperable.Caused by Ruptured Diaphragm of Boric Acid Transfer Pump Suction Header Isolation Valve 1-CH-80.Valve Diaphragm Replaced | Boric Acid |
| ML20028E044 | 11 January 1983 | LER 82-085/03L-0:on 821215,w/unit at Full Power,Emergency Diesel Generator 2J Removed from Svc for 7 H to Adjust Voltage Regulator Response Time.Caused by Voltage Regulator Drift.Procedures Will Be Revised | |
| ML20028E020 | 11 January 1983 | LER 82-084/03L-0:on 821216,during Full Power,Input from Range Nuclear Instrument N-42 to Comparator Drawer N-50 Was in Defeat.Caused by Failure to Take N-42 Out of Defeat After Deviation Alarm Determination.Operators to Be Reinstructed | |
| ML20028E078 | 11 January 1983 | LER 82-078/03X-1:on 821125,w/unit in Mode 3,120-volt Ac Vital Bus 1-IV Lost Voltage.Caused by Failure of Normal Power Supply Inverter 1-VB-I-04,due to Failed Oscillator Board,Transformer & Fuse.Components Replaced | |
| ML20028D131 | 5 January 1983 | LER 82-083/03L-0:on 821213,emergency Diesel Generator 2J Removed from Svc.Caused by Failure of 40X Unexcitation Alarm Relay Coil.Carbon Deposits & Arcing Damage of 40/76 Relay Contact Prevented Good Contact | |
| ML20028D157 | 5 January 1983 | Updated LER 81-071/03X-2:on 810911,hydraulic Snubber on Main Steam Line Discovered Inoperable Due to Loss of Oil from Reservoir.Caused by Leak Due to Scored Brass Bushing on Piston Shaft.Snubber Purged & Refilled.Reach Rod Retorqued | |
| ML20028C519 | 31 December 1982 | LER 82-083/03L-0:on 821204,while Operating at 17% Rated Thermal Power,Turbine Control Sys Malfunctioned Causing Sudden Increase in Load,Resulting in Reactor Trip.Caused by Malfunction of Analog Converter | |
| ML20028A865 | 16 November 1982 | LER 82-067/03L-0:on 821019,suction to RHR Sys Pumps a & B Lost for 36 Minutes.On 821020,pump Suction Lost for 33 Minutes.Caused by Ambiguous RCS Level Indication While Water Drained to Centerline of Nozzles.Water Added | |
| ML20028A882 | 16 November 1982 | LER 82-060/03L-0:on 821019,station Battery I-IV Failed 18- Month Discharge Surveillance Test.Caused by Natural End of Life.Battery Replaced | |
| ML20028A978 | 16 November 1982 | LER 82-071/03L-0:on 821027,control Power for B Casing Cooling Pump Found de-energized.Caused by Opened Circuit Breaker Unintentionally Disturbed by Workers.Circuit Breaker Closed & Power Verified |