ML20029D020
From kanterella
| ML20029D020 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 04/25/1994 |
| From: | Kane G VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| LER-94-007, LER-94-7, NUDOCS 9405030273 | |
| Download: ML20029D020 (5) | |
Similar Documents at North Anna | |
|---|---|
Category:LICENSEE EVENT REPORT (SEE ALSO AO
MONTHYEARML20029D0201994-04-25025 April 1994
[Table view]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 ML20045G9391993-07-0808 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 ML20044H1591993-05-27027 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 ML20044D5711993-05-14014 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 ML20044D2281993-05-12012 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 ML20044C9541993-05-0707 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 ML20044C9811993-05-0606 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 ML20024G6841991-04-18018 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 ML20029B5601991-03-0606 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 ML20029A6471991-02-22022 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 ML20028H6681991-01-18018 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 ML20043H8321990-06-22022 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 ML20043D5801990-06-0404 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 ML20012E3301990-03-27027 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 ML20012B6441990-03-0808 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 ML20006E2371990-02-0808 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 ML20006E3771990-02-0505 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 ML20006A8531990-01-19019 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 ML20005F8781990-01-11011 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 ML19332D5471989-11-22022 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 ML20024B7821983-07-0606 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 ML20024C1361983-06-30030 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 ML20024C3721983-06-30030 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 ML20024B9891983-06-28028 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 ML20024C2941983-06-23023 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 ML20024C3071983-06-22022 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 ML20024C0971983-06-22022 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 ML20023E0951983-06-0101 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 ML20023E0721983-05-26026 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 ML20023D5371983-05-13013 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 ML20023D2491983-05-11011 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 ML20023C5371983-05-10010 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 ML20023B5931983-04-27027 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 ML20023B5701983-04-27027 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 ML20028G6541983-02-0909 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 ML20028G6311983-02-0909 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 ML20028G0781983-01-31031 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 ML20028G0381983-01-28028 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 ML20028G0131983-01-28028 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 ML20028F3501983-01-19019 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 ML20028E0391983-01-11011 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 ML20028E0441983-01-11011 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 ML20028E0201983-01-11011 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 ML20028E0781983-01-11011 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 ML20028D1311983-01-0505 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 ML20028D1571983-01-0505 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 ML20028C5191982-12-31031 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 ML20028A8651982-11-16016 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 ML20028A8821982-11-16016 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 ML20028A9781982-11-16016 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 1994-04-25 Category:RO) MONTHYEARML20029D0201994-04-25025 April 1994
[Table view]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 ML20045G9391993-07-0808 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 ML20044H1591993-05-27027 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 ML20044D5711993-05-14014 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 ML20044D2281993-05-12012 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 ML20044C9541993-05-0707 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 ML20044C9811993-05-0606 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 ML20024G6841991-04-18018 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 ML20029B5601991-03-0606 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 ML20029A6471991-02-22022 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 ML20028H6681991-01-18018 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 ML20043H8321990-06-22022 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 ML20043D5801990-06-0404 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 ML20012E3301990-03-27027 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 ML20012B6441990-03-0808 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 ML20006E2371990-02-0808 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 ML20006E3771990-02-0505 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 ML20006A8531990-01-19019 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 ML20005F8781990-01-11011 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 ML19332D5471989-11-22022 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 ML20024B7821983-07-0606 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 ML20024C1361983-06-30030 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 ML20024C3721983-06-30030 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 ML20024B9891983-06-28028 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 ML20024C2941983-06-23023 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 ML20024C3071983-06-22022 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 ML20024C0971983-06-22022 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 ML20023E0951983-06-0101 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 ML20023E0721983-05-26026 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 ML20023D5371983-05-13013 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 ML20023D2491983-05-11011 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 ML20023C5371983-05-10010 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 ML20023B5931983-04-27027 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 ML20023B5701983-04-27027 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 ML20028G6541983-02-0909 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 ML20028G6311983-02-0909 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 ML20028G0781983-01-31031 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 ML20028G0381983-01-28028 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 ML20028G0131983-01-28028 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 ML20028F3501983-01-19019 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 ML20028E0391983-01-11011 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 ML20028E0441983-01-11011 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 ML20028E0201983-01-11011 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 ML20028E0781983-01-11011 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 ML20028D1311983-01-0505 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 ML20028D1571983-01-0505 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 ML20028C5191982-12-31031 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 ML20028A8651982-11-16016 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 ML20028A8821982-11-16016 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 ML20028A9781982-11-16016 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 1994-04-25 Category:TEXT-SAFETY REPORT MONTHYEARML20217N9281999-10-20020 October 1999
[Table view]Special Rept:On 991003,PZR PORV Actuation Mitigated RCS low- Temp Overpressure Transient.Caused by a RCP Facilitating Sweeping of Entrained Air Out of RCS Loops.Operating Procedure 2-OP-5.1 Will Be Revised ML20217H3631999-10-14014 October 1999 Rev 0 to COLR for North Anna 2 Cycle 14 Pattern Su ML18152A2811999-10-12012 October 1999 Technical Basis for Elimination of Nozzle Inner Radius Insps (for Nozzles Other than Reactor Vessel),Technical Basis for ASME Section XI Code Case N-619. ML20212J9251999-10-0101 October 1999 Safety Evaluation Accepting Licensee Relief Request IWE-3 for Second 10-year ISI for Plant ML20217D6851999-09-30030 September 1999 Monthly Operating Repts for Sept 1999 for North Anna Power Station,Units 1 & 2.With ML20211N2611999-09-0808 September 1999 Safety Evaluation Concluding That Proposed Irradiation of Fuel Rods Beyond Current Lead Rod Burnup Limit & Clarification of Terminology with Respect to Reconstituted Fuel Assemblies Acceptable ML20211J2561999-08-31031 August 1999 Safety Evaluation Accepting Elimination of Augmented ISI Program for Pressurizer Spray Lines at North Anna Unit 2 ML20216E5011999-08-31031 August 1999 Monthly Operating Repts for Aug 1999 for Naps,Units 1 & 2. with ML20211J2421999-08-31031 August 1999 Safety Evaluation Supporting Removal of Augmented Insp Program on RCS Bypass Lines from Licensing Basis of North Anna,Units 1 & 2 ML20210T0791999-08-13013 August 1999 Safety Evaluation Concluding That Revised Withdrawal Schedules for North Anna Units 1 & 2 Satisfy Requirements of App H to 10CFR50 & Therefore Acceptable ML20210S1411999-07-31031 July 1999 Monthly Operating Repts for July 1999 for North Anna Power Station.With ML20210Q9931999-07-31031 July 1999 Rev 1 to COLR for North Anna Power Station,Unit 2 Cycle 13 Pattern Ud ML20209E5641999-06-30030 June 1999 Monthly Operating Repts for June 1999 for North Anna Power Stations,Units 1 & 2.With ML20195G1901999-05-31031 May 1999 Monthly Operating Rept for May 1999 for NAPS Units 1 & 2. with ML20206L4831999-05-10010 May 1999 SER Accepting Request to Delay Submitting Plant,Unit 1 Class 1 Piping ISI Program for Third Insp Interval Until 010430, to Permit Development of Risk Informed ISI Program for Class 1 Piping ML20206Q6671999-04-30030 April 1999 Monthly Operating Repts for Apr 1999 for North Anna Power Station,Units 1 & 2.With ML20205S0391999-04-21021 April 1999 SER Accepting Request for Relief IWE5,per 10CFR50.55a(a)(3) & Proposed Alternatives for IWE2,IWE4,IWE6 & IWL2 Authorized Per 10CFR50.55a(a)(3)(ii) ML20205K3041999-03-31031 March 1999 Monthly Operating Repts for Mar 1999 for North Anna Power Station,Units 1 & 2.With ML20207K5921999-02-28028 February 1999 Monthly Operating Repts for Feb 1999 for North Anna Power Station,Units 1 & 2.With ML20207E1731999-02-18018 February 1999 Informs Commission of Status of Preparations of IAEA Osart Mission to North Anna Nuclear Power Plant Early Next Year ML20205A0241998-12-31031 December 1998 Summary of Facility Changes,Tests & Experiments,Including Summary of SEs Implemented at Plant During 1998,per 10CFR50.59(b)(2).With ML20199C8781998-12-31031 December 1998 Monthly Operating Repts for Dec 1998 for North Anna Power Station,Units 1 & 2.With ML20198H9541998-12-0303 December 1998 Safety Evaluation Authorizing Proposed Alternative for Remainder of Second 10-yr Insp Interval for Plant ML20198J5561998-12-0303 December 1998 ISI Summary Rept for North Anna Power Station,Unit 1 1998 Refueling Outage Owner Rept for Inservice Insps ML20197G8551998-11-30030 November 1998 Monthly Operating Repts for Nov 1998 for North Anna Power Station,Units 1 & 2.With ML20196G1381998-11-0303 November 1998 Safety Evaluation Authorizing Rev to Relief Request NDE-32 for Remainder of Second 10-yr Insp Interval for Each Unit ML20195D0571998-10-31031 October 1998 Monthly Operating Repts for Oct 1998 for North Anna Power Station,Units 1 & 2.With ML20154L0691998-10-14014 October 1998 COLR for North Anna Power Station Unit 1 Cycle 14 Pattern Xy ML20155J6911998-10-0909 October 1998 Staff Response to Tasking Memorandum & Stakeholder Concerns ML20154H4001998-09-30030 September 1998 Monthly Operating Repts for Sept 1998 for North Anna Power Station,Units 1 & 2.With ML20151X8011998-09-10010 September 1998 Special Rept:On 980622,groundwater Level at Piezometer P-22 Was Again Noted to Be Above Max Water Level by 0.71 Feet. Increased Frequency of Piezometer Monitoring & Installed Addl Piezometers at Toe of Slope Along Southwest Section ML20151W4711998-08-31031 August 1998 Monthly Operating Repts for Aug 1998 for North Anna Power Station Units 1 & 2.With ML20237A4341998-07-31031 July 1998 Monthly Operating Repts for July 1998 for North Anna Power Station,Units 1 & 2 ML20236V1251998-07-14014 July 1998 ISI Summary Rept for Naps,Unit 2,1998 Refueling Outage Owners Rept of Isis ML20236K5531998-07-0707 July 1998 SER Accepting Request for Change in ISI Commitment on Protection Against Pipe Breaks Outside Containment ML20236M3381998-06-30030 June 1998 Monthly Operating Repts for June 1998 for North Anna Power Station,Units 1 & 2 ML20248M1011998-05-31031 May 1998 Monthly Operating Repts for May 1998 for North Anna Power Station,Units 1 & 2 ML20248C8831998-05-29029 May 1998 SER Accepting Alternatives Proposed by Licensee for Use of Code Case N-535,pursuant to 10CFRa(a)(3)(i) in ASME Section XI Inservice Insp Program ML20247K9281998-05-15015 May 1998 Special Rept:On 980428,letdown PCV Exhibited Slow Response When C RCP Was Started.Cause to Be Determined.Review of Operating Procedure Will Be Performed to Determine If Enhancements Are Necessary ML20216A8971998-05-0606 May 1998 Rev 0 to Cycle 13 Pattern Ud COLR for North Anna Unit 2 ML20247F4441998-04-30030 April 1998 Monthly Operating Repts for Apr 1998 for North Anna Power Station,Units 1 & 2 ML20217B5321998-04-20020 April 1998 Safety Evaluation Supporting Proposed Alternative to ASME Code for Surface Exam of Seal Welds on Threaded Caps for Plant Reactor Vessel Head Penetrations for part-length CRDMs ML20217H9611998-04-0707 April 1998 Special Rept:On 980216,groundwater Level at Piezometer P-22, Again Noted to Be Above Max Water Level by 0.41 Feet.Design Package for Installation of Addl Standpipe Piezometers at Toe of Slope Southeast Section,Developed ML20216B1891998-03-31031 March 1998 Monthly Operating Repts for Mar 1998 for North Anna Power Station,Units 1 & 2 ML20216E8801998-03-0606 March 1998 Safety Evaluation Authorizing Licensee Request for Relief from ASME Code Requirements,Paragraph IWA-2400(c) (Summer Edition W/Summer 1983 Addenda),For Upcoming Naps,Unit 1 Outage,Per 10CFR50.55a(a)(3)(ii) ML20216E2561998-02-28028 February 1998 Monthly Operating Repts for Feb 1998 for North Anna Power Station,Units 1 & 2 ML20199J6431998-02-0202 February 1998 Safety Evaluation Approving Request for Approval to Repair Flaws in Accordance W/Gl 90-05 for ASME Code Class 3 SW Piping for North Anna,Unit 1,as Submitted in ISI Relief Request NDE-46 on 971218 ML20202D5811998-01-31031 January 1998 Monthly Operating Repts for Jan 1998 for North Anna Power Station,Units 1 & 2 ML20198S7571998-01-15015 January 1998 Safety Evaluation Accepting Licensee Request for Approval to Repair Flaws IAW GL-90-05 for ASME Code Class 3 Svc Water Piping ML20198P1351997-12-31031 December 1997 Monthly Operating Repts for Dec 1997 for North Anna Power Station,Units 1 & 2 1999-09-08 |
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