ML19259B434
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| ML19259B434 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 01/24/1979 |
| From: | COMMONWEALTH EDISON CO. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| Shared Package | |
| ML17173A584 | List: |
| References | |
| LER-79-004-03L, LER-79-4-3L, NUDOCS 7902090344 | |
| Download: ML19259B434 (1) | |
Similar Documents at Dresden | |
|---|---|
Category:LICENSEE EVENT REPORT (SEE ALSO AO
MONTHYEARML20042D3141989-12-29029 December 1989
[Table view]LER 89-032-00:on 891210,as-left Type B & C Local Leak Rate Test Data Exceeded Tech Spec Limit of 488.452 Std Cubic Ft/H.Caused by Degradation of Telephone & Electrical Conduit Penetration Seal.Conduit Cut & capped.W/891229 Ltr ML20024E9271983-08-30030 August 1983 LER 83-062/01T-0:on 830819,HPCI Motor Gear Unit Observed Moving Between High & Low Speed Stops W/O Operation Action. Caused by Failure of HPCI Controller Amplifier.Amplifier replaced.W/830830 Ltr ML20024D8341983-07-28028 July 1983 LER 83-055/01T-0:on 830719,one 1/8 by 1/16-inch Hole Found on Bellows Seal on Torus to Drywell Vacuum Breaker Line Containing Breakers 2-1601-32A & B.Cavity Filled to Original Thickness & Surface buffed.W/830728 Ltr ML20024D6991983-07-27027 July 1983 Updated LER 83-057/03X-1:on 821224,while Performing Routine Insp,Pinhole Leak Found in 2D3 to 2C3 Feedwater Heater Normal Drain Line.Caused by Excessive Movement of 2D3 Drain Line.Mod Initiated to Add restraints.W/830727 Ltr ML20024B6401983-06-30030 June 1983 LER 83-044/03L-0:on 830603,review of Area X Temp Showed Increase of Approx 25 F Due to Crack in Test Tap on MSIV 2C. Caused by Fatigue Due to Improper Support of 3/4-inch Test Connection.Steam Line Cut & capped.W/830630 Ltr ML20024B7641983-06-29029 June 1983 LER 83-045/03L-0:on 830608,during Normal Operation,Circuit Breaker for Core Spray Injection Valve MO2-1402-25B Tripped. Caused by Incorrect Setting on Circuit Breaker,Due to Personnel Error.Breaker Set correctly.W/830629 Ltr ML20024B6721983-06-24024 June 1983 Updated LER 82-053/03X-1:on 821215,while Performing LPCI Valve Operability surveillance,2A LPCI HX Bypass Valve Position Identification Lost.Breaker Trip Setting Found to Be One Setting Too Low.Cause unknown.W/830624 Ltr ML20024A5281983-06-0101 June 1983 LER 83-019/03L-0:on 830521,MSIV 203-1B Found W/Closure Time of 2.7 Exceeding Tech Spec Limit of 3 to 5 S.Caused by Misadjustment to Timing Mechanism on MSIV-203-1B.MSIV Adjusted within Tech Spec limits.W/830608 Ltr ML20023D8391983-05-25025 May 1983 LER 83-035/03L-0:on 830427,low Pressure Coolant Injection HX Discharge Valve MO2-1501-3B Failed to Open.Cause Undetermined.Control Circuitry Inspected by Electrical & Instrument Maint & Found satisfactory.W/830525 Ltr ML20023D9971983-05-23023 May 1983 Updated LER 83-013/03X-1:on 830211,power Lead from Welding Machine Became Disconnected & Grounded to Torus Base Metal Causing Arc Strike Which Fused Copper/Brass Into Metal. Cause Considered accident.W/830523 Ltr ML20023C2961983-05-0505 May 1983 LER 83-027/03L-0:on 830408,during Valve Insp,Grease Discovered on Seats & Discs.Caused by Maint Procedures Not Prohibiting Personnel Placing Grease on Seat & Disc.Grease Removed,Valves Repaired & Procedures Will Be Revised ML20023C2801983-05-0404 May 1983 LER 83-025/03L-0:on 830409,reactor Bldg Fuel Pool Channel a High Radiation Alarm Activated,Causing Reactor Bldg Vent Sys to Trip.Caused by Burned Out Relay Coil.Relay Coil Replaced ML20023B8271983-04-26026 April 1983 LER 83-024/03L-0:on 830403,while Performing Core Spray Operability Test,Valve Mo 1402-4A Failed to Open.Caused by Burned Out Motor.Motor Replaced ML20028F3601983-01-19019 January 1983 LER 82-058/03L-0:on 821226,small Leak Found on Reactor Water Cleanup Line 2-1201B 8-inch-A Between 2-1201-135B & 98B Valves.Cause Unknown.Pipe Will Be Examined When Section Replaced During 1983 Refueling Outage ML20028F4791983-01-19019 January 1983 LER 83-003/03L-0:on 830108,during Surveillances Dis 1400-5 & DOS 6600-1,diesel Generator Low Water Pressure Alarm Received.Caused by Bad Low Cooling Water Pressure Switch. Switch Replaced W/Class 9012 Type GAW-5 ML20028E7911983-01-18018 January 1983 LER 82-057/03L-0:on 821224,pin Hole Leak Found in 2D3 to 2C3 Feedwater Heater Normal Drain Line.Caused by Excessive Movement of 2D3 Feedwater Heater Normal Drain Line.Mod to Add Sys Restraints Initiated ML20028E9851983-01-14014 January 1983 LER 83-002/01T-0:on 830105,during Mode 1,while Performing Leak Checks,Tap Isolation Valve 3-1299-13 & Pipe Cap Found Blowing Steam.Cause Unknown.Pipe Threads Chased & New Cap Installed.Valve Will Be Replaced During Next Refueling ML20028E2421983-01-12012 January 1983 LER 82-056/03L-0:on 821218,rod Block Setpoint of 12.2% Found on APRM 6.Caused by Setpoint Drift.Aprm 6 Bypassed While Rod Block Setpoint Readjusted ML20028E2681983-01-10010 January 1983 LER 82-049/03L-0:on 821217,D-3 Diesel Generator Failed to Start on Two Successive Attempts Following Semiannual Insp. Caused by Worn Out Cylinder & Accumulation of Dust Particles Inside Air Starter.Starter Replaced ML20028E9641983-01-10010 January 1983 Updated LER 82-043/03X-1:on 821028,during Mode 1,w/east Scram Discharge Vol Level Switches Under Test,Magnetrol Level Switches 82D & 82F Would Not Trip on Command.Caused by Misaligned Upper Switch Contact Mechanisms ML20028C2271982-12-20020 December 1982 LER 82-049/03L-0:on 821128,during Quarterly Valve Timing Surveillance DOS 1600-1,torus Inert & Purge Valve 2-1601-56 Would Not auto-close.Caused by Versa Valve Leaking from Weep Hole Due to Hardening of O-ring Seal.Valve Replaced ML20028E6951982-12-17017 December 1982 Updated LER 82-046/03X-1:on 821112,during Routine Insp,Water Discovered Spraying from 1-inch Drain Line Off Bottom of 3A Feedwater Isolation Valve MO3-3206A.Caused by Cracked Weld. Drain/Line Removed & Refitted ML20028C2001982-12-0808 December 1982 Updated LER 82-030/03X-1:on 820716,3A TIP Ball Valve Failed to Reclose After Opening During Valve Exercise.Cause Unknown.Limit Switches & Ball Valve Replaced & Successfully Tested ML20028B0961982-11-18018 November 1982 LER 82-045/01T-0:on 821109,during Normal Operation,Diesel Generator D-3 Tripped on Low Cooling Water Pressure.Caused by Bad Low Cooling Water Pressure Switch.Switch Replaced ML20028A1161982-11-0909 November 1982 LER 82-042/01T-0:on 821027,excessive Water Found Leaking from Recirculation Pump Seal 3B.Caused by Recirculation Pump Seal Failure.Unit Manually Brought Down.Seals Replaced. Supplementary LER to Be Issued When Cause of Failure Known ML20028A7181982-11-0404 November 1982 LER 82-040/03L-0:on 821019,upscale Trip Point of Channel B Refuel Floor Area Radiation monitor,3-1705-8B,found at 130 Mrem/H.Caused by Instrument Set Point Drift.Monitor Reset to Trip at 90 Mrem/H ML20052G5911982-05-0303 May 1982 LER 82-018/03L-0:on 820414,closure Time of Nitrogen Inerting Stop Valve 3-1601-55 Exceeded Tech Spec Limit of 15-s.Caused by Failure of Asco Solenoid to Permit Normal bleed-off of Air Supply & Close Valve.Solenoid Replaced ML20052E4191982-05-0303 May 1982 LER 82-011/03L-0:on 820403,LPCI Differential Pressure Switch 2-261-34B Declared Inoperable During Monthly Surveillance Test Dis 1500-9.Caused by Wear of Contact Point in Mechanical Linkage.Switch Adjusted ML20052E6361982-04-28028 April 1982 LER 82-012/03L-0:on 820407,during Semiannual QA Audit,No Info Found to Verify Instrument Check Surveillance of Temp Detectors for Safety/Relief Valves.Caused by Failure to Include Requirement Change in Tech Spec Procedures ML20052E4371982-04-28028 April 1982 LER 82-017/03L-0:on 820407,cracked Weld Discovered on Test Tap of Condensate Booster Recirculation Line.All Leakage Contained in Turbine Bldg Floor Sumps.Cause Not Stated.Tap Cut & Capped ML20052E8821982-04-27027 April 1982 LER 82-019/01T-0:on 820417,while Conducting ASME Class I Hydrostatic Test During Shutdown,Water Discovered Leaking from LPCI Check Valve 3/4-inch Test Equalizing Line.Caused by Inadequate Piping Support ML20052E4761982-04-27027 April 1982 LER 82-013/03L-0:on 820402,LPCI Differential Pressure Switch 2-261-35B Failed to Operate on Increasing Differential Pressure.Caused by Contact Point Wear in Mechanical Linkage. Pressure Switch Adjusted ML20052C4241982-04-23023 April 1982 LER 82-016/03L-0:on 820329,during Refueling Outage Mechanical Snubber 23 on Reactor Water Cleanup Sys Found Inoperable.Caused by Overloading Snubber During One Time Event.Snubber Replaced W/Hydraulic Snubber HSSA-10 ML20052G6901982-04-22022 April 1982 Corrected LER 82-010/03L-0:on 820325,pilot Cell Voltage Readings Not Taken for 24/48,125 or 250-volt Dc Batteries Per Tech Specs.Caused by Broken Fluke Voltmeter.Event to Be Reviewed W/Shift Supervisors ML20052E4731982-04-22022 April 1982 Updated LER 80-048/03X-2:on 801223,while Testing Group 2 & 3 Isolation Circuitry,Shutdown Cooling Sys Inboard Isolation Valve Did Not Close.Caused by Dirt Buildup on Valve Stem. Thermal Overloads Adjusted & Reset ML20052B4121982-04-20020 April 1982 LER 82-010/03L-0:on 820325,while Unit 2 Was in Normal Operation & Unit 3 in Refuel,Pilot Cell Voltage Readings Were Not Taken for Units 2 & 3 Dc Batteries.Caused by Operator Error ML20052E7191982-04-17017 April 1982 Updated LER 82-002/03X-1:on 820107,during Refueling Outage, Outboard MSIVs 3-203-2B & 3-203-2D Showed Leakages at Rates in Excess of Tech Specs.Caused by Packing Leakage.Valve Stem leak-off Lines Isolated & Packing Tightened ML20052E4851982-04-0101 April 1982 Updated LER 81-026/03X-1:on 810915,during Shutdown Process, Rod P-10 Showed Wrong Position on Rod Worth Minimizer.Caused by Diode Failure Resulting in Multiple Output Distributor Error Forcing Rod Block to Occur.Five Diodes Replaced ML20050D4771982-03-30030 March 1982 LER 82-014/03L-0:on 820317,crack Discovered in Head Seal Leak Detection Piping.Cause Undetermined.Leakage Located in Section of Pipe That Cannot Be Isolated.Analysis & Repairs to Be Done Following Cavity Drain Down ML20042A5941982-03-0909 March 1982 LER 82-007/03L-0:on 820213,during Routine Surveillance of Reactor Level Switch LIS 2-263-58B,setpoint Found to Be Above Tech Spec Limit.Caused by Instrument Setpoint Drift. Switch Adjusted ML20042A7541982-03-0808 March 1982 LER 82-006/03L-0:on 820210,ATWS Div II High Pressure Transmitter 2-263-20D,read Offscale High & Tripped Light on Panel 2202-70B.Caused by Faulty Capacitor in Amplifier Circuit Board.Amplifier Circuit Board Replaced ML20041E6811982-03-0303 March 1982 LER 82-012/03L-0:on 820204,drywell & Torus Purge Sys Valve 3-1601-21 Found to Leak.Caused by Failure of Resilient Seating Matl to Maintain Proper Seal to Valve Butterfly Disc.Valve Will Be Replaced ML20041E7481982-03-0202 March 1982 LER 82-011/03L-0:on 820203,during Performance of Leak Tests Per Dts 1600-1,leakage Rate of 284.84 Scfh Observed on HPCI Turbine Exhaust Check Valve 3-2301-45.Cause Not Determined. Valve Repaired & Vol Retested ML20041E6211982-03-0202 March 1982 LER 82-013/03L-0:on 820204,during Refueling Outage,Nitrogen Inerting Makeup Sys Supplying Nitrogen to Drywell Found to Leak at Rate of 80.39 Scfh.Caused by External Damage to Pressure Valve RV-3-8526.Valve Will Be Replaced ML20042A6501982-02-25025 February 1982 Updated LER 81-033/01X-1:on 810602,while Blowing Down HPCI Steam Supply Line W/Hpci Turbine on Turning Gear,Auxiliary Oil Pump Tripped & Motor Was Burned.Caused by Loose Stator Winding.Motor Rewound ML20042C5181982-02-25025 February 1982 Updated LER 81-025/01X-1:on 810914,during Automatic Depressurization Sys Valve Operability Surveillance,B Electromatic Relief Valve Failed to Open at Rated Pressure. Caused by Excessive Leakage on Threads ML20049H7801982-02-23023 February 1982 LER 82-008/03L-0:on 820126,HPCI Temp Switches 2371A,2372A, 2373B,2370C & 2370D Were Above Tech Spec Limits.Caused by Misaligned Microswitch Due to Loose Screws Which Enlarged Gap Between Actuator & Switch Plunger ML20049H6931982-02-23023 February 1982 LER 82-003/03L-0:on 820127,leak of Over 1% Detected Through Charcoal Filters in B Standby Gas Treatment Sys.Caused by Improper Packing of Charcoal Canisters.Charcoal Beds Replaced ML20049H6571982-02-23023 February 1982 LER 82-005/03L-0:on 820130,during Single Control Rod Scram Testing,Crd H-10 Failed to Scram.When Solenoid Fuses Pulled,Crd Failed to Scram.Caused by Sticking Scram Pilot Solenoid Valve.Both Valves Replaced & Tested ML20049H6091982-02-23023 February 1982 LER 82-004/03L-0:on 820127,after Filling Floor Drain Sample Tank A,Ci Content Found Above Tech Spec.Caused by Failure of Conductivity Recorder in Radwaste Control Room to Indicate That Carryover Was Occurring 1989-12-29 Category:RO) MONTHYEARML20042D3141989-12-29029 December 1989
[Table view]LER 89-032-00:on 891210,as-left Type B & C Local Leak Rate Test Data Exceeded Tech Spec Limit of 488.452 Std Cubic Ft/H.Caused by Degradation of Telephone & Electrical Conduit Penetration Seal.Conduit Cut & capped.W/891229 Ltr ML20024E9271983-08-30030 August 1983 LER 83-062/01T-0:on 830819,HPCI Motor Gear Unit Observed Moving Between High & Low Speed Stops W/O Operation Action. Caused by Failure of HPCI Controller Amplifier.Amplifier replaced.W/830830 Ltr ML20024D8341983-07-28028 July 1983 LER 83-055/01T-0:on 830719,one 1/8 by 1/16-inch Hole Found on Bellows Seal on Torus to Drywell Vacuum Breaker Line Containing Breakers 2-1601-32A & B.Cavity Filled to Original Thickness & Surface buffed.W/830728 Ltr ML20024D6991983-07-27027 July 1983 Updated LER 83-057/03X-1:on 821224,while Performing Routine Insp,Pinhole Leak Found in 2D3 to 2C3 Feedwater Heater Normal Drain Line.Caused by Excessive Movement of 2D3 Drain Line.Mod Initiated to Add restraints.W/830727 Ltr ML20024B6401983-06-30030 June 1983 LER 83-044/03L-0:on 830603,review of Area X Temp Showed Increase of Approx 25 F Due to Crack in Test Tap on MSIV 2C. Caused by Fatigue Due to Improper Support of 3/4-inch Test Connection.Steam Line Cut & capped.W/830630 Ltr ML20024B7641983-06-29029 June 1983 LER 83-045/03L-0:on 830608,during Normal Operation,Circuit Breaker for Core Spray Injection Valve MO2-1402-25B Tripped. Caused by Incorrect Setting on Circuit Breaker,Due to Personnel Error.Breaker Set correctly.W/830629 Ltr ML20024B6721983-06-24024 June 1983 Updated LER 82-053/03X-1:on 821215,while Performing LPCI Valve Operability surveillance,2A LPCI HX Bypass Valve Position Identification Lost.Breaker Trip Setting Found to Be One Setting Too Low.Cause unknown.W/830624 Ltr ML20024A5281983-06-0101 June 1983 LER 83-019/03L-0:on 830521,MSIV 203-1B Found W/Closure Time of 2.7 Exceeding Tech Spec Limit of 3 to 5 S.Caused by Misadjustment to Timing Mechanism on MSIV-203-1B.MSIV Adjusted within Tech Spec limits.W/830608 Ltr ML20023D8391983-05-25025 May 1983 LER 83-035/03L-0:on 830427,low Pressure Coolant Injection HX Discharge Valve MO2-1501-3B Failed to Open.Cause Undetermined.Control Circuitry Inspected by Electrical & Instrument Maint & Found satisfactory.W/830525 Ltr ML20023D9971983-05-23023 May 1983 Updated LER 83-013/03X-1:on 830211,power Lead from Welding Machine Became Disconnected & Grounded to Torus Base Metal Causing Arc Strike Which Fused Copper/Brass Into Metal. Cause Considered accident.W/830523 Ltr ML20023C2961983-05-0505 May 1983 LER 83-027/03L-0:on 830408,during Valve Insp,Grease Discovered on Seats & Discs.Caused by Maint Procedures Not Prohibiting Personnel Placing Grease on Seat & Disc.Grease Removed,Valves Repaired & Procedures Will Be Revised ML20023C2801983-05-0404 May 1983 LER 83-025/03L-0:on 830409,reactor Bldg Fuel Pool Channel a High Radiation Alarm Activated,Causing Reactor Bldg Vent Sys to Trip.Caused by Burned Out Relay Coil.Relay Coil Replaced ML20023B8271983-04-26026 April 1983 LER 83-024/03L-0:on 830403,while Performing Core Spray Operability Test,Valve Mo 1402-4A Failed to Open.Caused by Burned Out Motor.Motor Replaced ML20028F3601983-01-19019 January 1983 LER 82-058/03L-0:on 821226,small Leak Found on Reactor Water Cleanup Line 2-1201B 8-inch-A Between 2-1201-135B & 98B Valves.Cause Unknown.Pipe Will Be Examined When Section Replaced During 1983 Refueling Outage ML20028F4791983-01-19019 January 1983 LER 83-003/03L-0:on 830108,during Surveillances Dis 1400-5 & DOS 6600-1,diesel Generator Low Water Pressure Alarm Received.Caused by Bad Low Cooling Water Pressure Switch. Switch Replaced W/Class 9012 Type GAW-5 ML20028E7911983-01-18018 January 1983 LER 82-057/03L-0:on 821224,pin Hole Leak Found in 2D3 to 2C3 Feedwater Heater Normal Drain Line.Caused by Excessive Movement of 2D3 Feedwater Heater Normal Drain Line.Mod to Add Sys Restraints Initiated ML20028E9851983-01-14014 January 1983 LER 83-002/01T-0:on 830105,during Mode 1,while Performing Leak Checks,Tap Isolation Valve 3-1299-13 & Pipe Cap Found Blowing Steam.Cause Unknown.Pipe Threads Chased & New Cap Installed.Valve Will Be Replaced During Next Refueling ML20028E2421983-01-12012 January 1983 LER 82-056/03L-0:on 821218,rod Block Setpoint of 12.2% Found on APRM 6.Caused by Setpoint Drift.Aprm 6 Bypassed While Rod Block Setpoint Readjusted ML20028E2681983-01-10010 January 1983 LER 82-049/03L-0:on 821217,D-3 Diesel Generator Failed to Start on Two Successive Attempts Following Semiannual Insp. Caused by Worn Out Cylinder & Accumulation of Dust Particles Inside Air Starter.Starter Replaced ML20028E9641983-01-10010 January 1983 Updated LER 82-043/03X-1:on 821028,during Mode 1,w/east Scram Discharge Vol Level Switches Under Test,Magnetrol Level Switches 82D & 82F Would Not Trip on Command.Caused by Misaligned Upper Switch Contact Mechanisms ML20028C2271982-12-20020 December 1982 LER 82-049/03L-0:on 821128,during Quarterly Valve Timing Surveillance DOS 1600-1,torus Inert & Purge Valve 2-1601-56 Would Not auto-close.Caused by Versa Valve Leaking from Weep Hole Due to Hardening of O-ring Seal.Valve Replaced ML20028E6951982-12-17017 December 1982 Updated LER 82-046/03X-1:on 821112,during Routine Insp,Water Discovered Spraying from 1-inch Drain Line Off Bottom of 3A Feedwater Isolation Valve MO3-3206A.Caused by Cracked Weld. Drain/Line Removed & Refitted ML20028C2001982-12-0808 December 1982 Updated LER 82-030/03X-1:on 820716,3A TIP Ball Valve Failed to Reclose After Opening During Valve Exercise.Cause Unknown.Limit Switches & Ball Valve Replaced & Successfully Tested ML20028B0961982-11-18018 November 1982 LER 82-045/01T-0:on 821109,during Normal Operation,Diesel Generator D-3 Tripped on Low Cooling Water Pressure.Caused by Bad Low Cooling Water Pressure Switch.Switch Replaced ML20028A1161982-11-0909 November 1982 LER 82-042/01T-0:on 821027,excessive Water Found Leaking from Recirculation Pump Seal 3B.Caused by Recirculation Pump Seal Failure.Unit Manually Brought Down.Seals Replaced. Supplementary LER to Be Issued When Cause of Failure Known ML20028A7181982-11-0404 November 1982 LER 82-040/03L-0:on 821019,upscale Trip Point of Channel B Refuel Floor Area Radiation monitor,3-1705-8B,found at 130 Mrem/H.Caused by Instrument Set Point Drift.Monitor Reset to Trip at 90 Mrem/H ML20052G5911982-05-0303 May 1982 LER 82-018/03L-0:on 820414,closure Time of Nitrogen Inerting Stop Valve 3-1601-55 Exceeded Tech Spec Limit of 15-s.Caused by Failure of Asco Solenoid to Permit Normal bleed-off of Air Supply & Close Valve.Solenoid Replaced ML20052E4191982-05-0303 May 1982 LER 82-011/03L-0:on 820403,LPCI Differential Pressure Switch 2-261-34B Declared Inoperable During Monthly Surveillance Test Dis 1500-9.Caused by Wear of Contact Point in Mechanical Linkage.Switch Adjusted ML20052E6361982-04-28028 April 1982 LER 82-012/03L-0:on 820407,during Semiannual QA Audit,No Info Found to Verify Instrument Check Surveillance of Temp Detectors for Safety/Relief Valves.Caused by Failure to Include Requirement Change in Tech Spec Procedures ML20052E4371982-04-28028 April 1982 LER 82-017/03L-0:on 820407,cracked Weld Discovered on Test Tap of Condensate Booster Recirculation Line.All Leakage Contained in Turbine Bldg Floor Sumps.Cause Not Stated.Tap Cut & Capped ML20052E8821982-04-27027 April 1982 LER 82-019/01T-0:on 820417,while Conducting ASME Class I Hydrostatic Test During Shutdown,Water Discovered Leaking from LPCI Check Valve 3/4-inch Test Equalizing Line.Caused by Inadequate Piping Support ML20052E4761982-04-27027 April 1982 LER 82-013/03L-0:on 820402,LPCI Differential Pressure Switch 2-261-35B Failed to Operate on Increasing Differential Pressure.Caused by Contact Point Wear in Mechanical Linkage. Pressure Switch Adjusted ML20052C4241982-04-23023 April 1982 LER 82-016/03L-0:on 820329,during Refueling Outage Mechanical Snubber 23 on Reactor Water Cleanup Sys Found Inoperable.Caused by Overloading Snubber During One Time Event.Snubber Replaced W/Hydraulic Snubber HSSA-10 ML20052G6901982-04-22022 April 1982 Corrected LER 82-010/03L-0:on 820325,pilot Cell Voltage Readings Not Taken for 24/48,125 or 250-volt Dc Batteries Per Tech Specs.Caused by Broken Fluke Voltmeter.Event to Be Reviewed W/Shift Supervisors ML20052E4731982-04-22022 April 1982 Updated LER 80-048/03X-2:on 801223,while Testing Group 2 & 3 Isolation Circuitry,Shutdown Cooling Sys Inboard Isolation Valve Did Not Close.Caused by Dirt Buildup on Valve Stem. Thermal Overloads Adjusted & Reset ML20052B4121982-04-20020 April 1982 LER 82-010/03L-0:on 820325,while Unit 2 Was in Normal Operation & Unit 3 in Refuel,Pilot Cell Voltage Readings Were Not Taken for Units 2 & 3 Dc Batteries.Caused by Operator Error ML20052E7191982-04-17017 April 1982 Updated LER 82-002/03X-1:on 820107,during Refueling Outage, Outboard MSIVs 3-203-2B & 3-203-2D Showed Leakages at Rates in Excess of Tech Specs.Caused by Packing Leakage.Valve Stem leak-off Lines Isolated & Packing Tightened ML20052E4851982-04-0101 April 1982 Updated LER 81-026/03X-1:on 810915,during Shutdown Process, Rod P-10 Showed Wrong Position on Rod Worth Minimizer.Caused by Diode Failure Resulting in Multiple Output Distributor Error Forcing Rod Block to Occur.Five Diodes Replaced ML20050D4771982-03-30030 March 1982 LER 82-014/03L-0:on 820317,crack Discovered in Head Seal Leak Detection Piping.Cause Undetermined.Leakage Located in Section of Pipe That Cannot Be Isolated.Analysis & Repairs to Be Done Following Cavity Drain Down ML20042A5941982-03-0909 March 1982 LER 82-007/03L-0:on 820213,during Routine Surveillance of Reactor Level Switch LIS 2-263-58B,setpoint Found to Be Above Tech Spec Limit.Caused by Instrument Setpoint Drift. Switch Adjusted ML20042A7541982-03-0808 March 1982 LER 82-006/03L-0:on 820210,ATWS Div II High Pressure Transmitter 2-263-20D,read Offscale High & Tripped Light on Panel 2202-70B.Caused by Faulty Capacitor in Amplifier Circuit Board.Amplifier Circuit Board Replaced ML20041E6811982-03-0303 March 1982 LER 82-012/03L-0:on 820204,drywell & Torus Purge Sys Valve 3-1601-21 Found to Leak.Caused by Failure of Resilient Seating Matl to Maintain Proper Seal to Valve Butterfly Disc.Valve Will Be Replaced ML20041E7481982-03-0202 March 1982 LER 82-011/03L-0:on 820203,during Performance of Leak Tests Per Dts 1600-1,leakage Rate of 284.84 Scfh Observed on HPCI Turbine Exhaust Check Valve 3-2301-45.Cause Not Determined. Valve Repaired & Vol Retested ML20041E6211982-03-0202 March 1982 LER 82-013/03L-0:on 820204,during Refueling Outage,Nitrogen Inerting Makeup Sys Supplying Nitrogen to Drywell Found to Leak at Rate of 80.39 Scfh.Caused by External Damage to Pressure Valve RV-3-8526.Valve Will Be Replaced ML20042A6501982-02-25025 February 1982 Updated LER 81-033/01X-1:on 810602,while Blowing Down HPCI Steam Supply Line W/Hpci Turbine on Turning Gear,Auxiliary Oil Pump Tripped & Motor Was Burned.Caused by Loose Stator Winding.Motor Rewound ML20042C5181982-02-25025 February 1982 Updated LER 81-025/01X-1:on 810914,during Automatic Depressurization Sys Valve Operability Surveillance,B Electromatic Relief Valve Failed to Open at Rated Pressure. Caused by Excessive Leakage on Threads ML20049H7801982-02-23023 February 1982 LER 82-008/03L-0:on 820126,HPCI Temp Switches 2371A,2372A, 2373B,2370C & 2370D Were Above Tech Spec Limits.Caused by Misaligned Microswitch Due to Loose Screws Which Enlarged Gap Between Actuator & Switch Plunger ML20049H6931982-02-23023 February 1982 LER 82-003/03L-0:on 820127,leak of Over 1% Detected Through Charcoal Filters in B Standby Gas Treatment Sys.Caused by Improper Packing of Charcoal Canisters.Charcoal Beds Replaced ML20049H6571982-02-23023 February 1982 LER 82-005/03L-0:on 820130,during Single Control Rod Scram Testing,Crd H-10 Failed to Scram.When Solenoid Fuses Pulled,Crd Failed to Scram.Caused by Sticking Scram Pilot Solenoid Valve.Both Valves Replaced & Tested ML20049H6091982-02-23023 February 1982 LER 82-004/03L-0:on 820127,after Filling Floor Drain Sample Tank A,Ci Content Found Above Tech Spec.Caused by Failure of Conductivity Recorder in Radwaste Control Room to Indicate That Carryover Was Occurring 1989-12-29 Category:TEXT-SAFETY REPORT MONTHYEARML20249C8491999-09-30030 September 1999
[Table view]1999 Third Quarter Rept of Completed Changes,Tests & Experiments Evaluated,Per 10CFR50.59(b)(2), for Dresden Nuclear Power Station. with ML20217A1691999-09-22022 September 1999 Part 21 Rept Re Engine Sys,Inc Controllers,Manufactured Between Dec 1997 & May 1999,that May Have Questionable Soldering Workmanship.Caused by Inadequate Personnel Training.Sent Rept to All Nuclear Customers ML20210R6081999-07-31031 July 1999 Monthly Operating Repts for July 1999 for Dresden Nuclear Power,Units 1,2 & 3.With ML20209E1291999-06-30030 June 1999 Monthly Operating Repts for June 1999 for Dresden Nuclear Power Station,Units 1,2 & 3.With ML20209J3481999-06-30030 June 1999 1999 Second Quarter Rept of Completed Changes,Tests & Experiments, Per 10CFR50.59.With ML20210D3071999-06-30030 June 1999 Corrected Page 8 to MOR for June 1999 for DNPS Unit 3 ML20195G6381999-05-31031 May 1999 Monthly Operating Repts for May 1999 for Dresden Nuclear Power Station,Units 1,2 & 3.With ML20195B2591999-05-19019 May 1999 Rev 66a to CE-1-A,consisting of Proposed Changes to QAP for Dnps,Qcs,Znps,Lcs,Byron & Braidwood Stations ML20206N2821999-04-30030 April 1999 Monthly Operating Repts for Apr 1999 for Dresden Nuclear Power Station,Units 1,2 & 3.With ML20206B1901999-03-31031 March 1999 First Quarter Rept of Completed Changes,Tests & Experiments Per 10CFR50.59 for Dresden Nuclear Power Station. with ML20205N7491999-03-31031 March 1999 Monthly Operating Repts for Mar 1999 for Dresden Nuclear Power Station,Units 1,2 & 3.With ML20207M6921999-02-28028 February 1999 Monthly Operating Repts for Feb 1999 for Dresden Nuclear Power Station,Units 1,2 & 3.With ML20207E9311999-02-26026 February 1999 Part 21 Rept Re Sprague Model TE1302 Aluminum Electrolytic Capacitors with Date Code of 9322H.Caused by Aluminum Electrolytic Capacitors.Affected Capacitors Replaced ML20199M0891999-01-22022 January 1999 Part 21 Rept Re Failure of Square Root Converters.Caused by Failed Aluminum Electrolytic Capacitory Spargue Electric Co (Model Number TE1302 with Mfg Date Code 9322H).Sent Square Root Converters Back to Mfg,Barker Microfarads,Inc ML20199D3261998-12-31031 December 1998 10CFR50.59 SER for 1998-04 Quarter, of Changes,Tests & Experiments.With ML20199C8951998-12-31031 December 1998 Monthly Operating Repts for Dec 1998 for Dnps,Units 1,2 & 3 ML20205M7061998-12-31031 December 1998 Unicom Corp 1998 Summary Annual Rept. with ML20197G8591998-11-30030 November 1998 Monthly Operating Repts for Nov 1998 for Dresden Nuclear Power Station.With ML20196A4191998-11-19019 November 1998 Safety Evaluation Accepting QA TR CE-1-A,Rev 66 Re Changes in Independent & Onsite Review Organization by Creating NSRB ML20196J0061998-11-19019 November 1998 Rev 66 to Topical Rept CE-1-A, QA Program ML20195D2861998-10-31031 October 1998 Monthly Operating Repts for Oct 1998 for Dresden Nuclear Power Station.With ML20154L3681998-09-30030 September 1998 Monthly Operating Repts for Sept 1998 for Dresden Nuclear Power Station,Units 1,2 & 3.With ML20154N4131998-09-30030 September 1998 1998 Third Quarter 10CFR50.59 Rept, for Dresden Nuclear Power Station of Completed Changes,Tests & Experiments ML20153C5061998-09-21021 September 1998 SER Accepting Qualified Unit 1 Supervisor Initial & Continuing Training Program for Dresden Nuclear Power Station,Unit 1 ML20151Y2711998-08-31031 August 1998 Monthly Operating Repts for Aug 1998 for Dresden Nuclear Power Station,Units 1,2 & 3.With ML20237E2331998-08-21021 August 1998 Revised Pages of Section 20 of Rev 66 to CE-1-A, QA Topical Rept ML20237A7161998-07-31031 July 1998 Monthly Operating Repts for July 1998 for Dresden Nuclear Power Station,Units 1,2 & 3 ML20236Q5851998-06-30030 June 1998 1998 Second Quarter 10CFR50.59 Rept, for Dresden Nuclear Power Station of Completed Changes,Tests & Experiments ML20236F8131998-06-30030 June 1998 Rev 0 to Defueled SAR Dresden Nuclear Power Station Unit 1 Commonwealth Edison Co ML20236T8331998-06-30030 June 1998 COLR for Dresden Station Unit 3,Cycle 15 ML20236T8391998-06-30030 June 1998 Rev 1 to EMF-96-141, Dresden Unit 3 Cycle 15 Reload Analysis Rept ML20236M6041998-06-30030 June 1998 Monthly Operating Repts for June 1998 for Dresden Nuclear Power Station,Units 1,2 & 3 ML20248M3021998-05-31031 May 1998 Monthly Operating Repts for May 1998 for Dresden Nuclear Power Station,Units 1,2 & 3 ML20248F3531998-05-21021 May 1998 Part 21 Rept Re Electronic Equipment Repaired or Reworked by Integrated Resources,Inc from Approx 930101-980501.Caused by 1 Capacitor in Each Unit Being Installed W/Reverse Polarity. Policy of Second Checking All Capacitors Is Being Adopted ML20247F3391998-04-30030 April 1998 Monthly Operating Repts for Apr 1998 for Dresden Nuclear Power Station,Units 1,2 & 3 ML20217D0281998-04-22022 April 1998 Part 21 Rept Re Additive Constants Used in MCPR Determination for Siemens ATRIUM-9B Fuel by Core Monitoring Sys Were Found to Be non-conservative.SPC Personnel Notified All Customers w/ATRIUM-9B Lead Test Assemblies ML20216D4411998-03-31031 March 1998 First Quarter Rept of Completed Changes,Tests & Experiments for 10CFR5059 ML20216C9651998-03-31031 March 1998 Monthly Operating Repts for Mar 1998 for Dresden Nuclear Power Station,Units 1,2 & 3 ML20216E2531998-02-28028 February 1998 Monthly Operating Repts for Feb 1998 for Dresden Nuclear Power Station ML20202F7831998-01-31031 January 1998 Monthly Operating Repts for Jan 1998 for Dresden Nuclear Power Station ML20199K1651998-01-23023 January 1998 Rev 65h to Topical Rept CE-1-A, Comm Ed QA Tr ML20198P5321997-12-31031 December 1997 Monthly Operating Repts for Dec 1997 for Dresden Nuclear Power Station ML20198P7021997-12-31031 December 1997 Fourth Quarter Rept of Completed Changes,Tests & Experiments Per 10CFR50.59 ML20216D3611997-12-31031 December 1997 Unicom Corp 1997 Summary Annual Rept ML20203F8781997-11-30030 November 1997 Monthly Operating Repts for Nov 1997 for Dresden Nuclear Power Station ML20199B0701997-10-31031 October 1997 Monthly Operating Repts for Oct 1997 for Dresden Nuclear Power Station ML20217H7201997-09-30030 September 1997 Monthly Operating Repts for Sept 1997 for Dresden Nuclear Power Station,Units 1,2 & 3 ML20210V2401997-09-19019 September 1997 Rev 65g to Topical Rept CE-1-A, Comm Ed QA Manual ML20216J3781997-08-31031 August 1997 Monthly Operating Repts for Aug 1997 for DNPS ML20210H5511997-07-31031 July 1997 Monthly Operating Repts for July 1997 for DNPS IAW RG 1.16 & GL 97-02 1999-09-30 |
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