ML19257C013
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| ML19257C013 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 01/18/1980 |
| From: | Mayer L NORTHERN STATES POWER CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| Shared Package | |
| ML19257C009 | List: |
| References | |
| LER-80-001-01T, LER-80-1-1T, NUDOCS 8001220567 | |
| Download: ML19257C013 (3) | |
Similar Documents at Prairie Island | |
|---|---|
Category:LICENSEE EVENT REPORT (SEE ALSO AO
MONTHYEARML20029E4701994-05-12012 May 1994
[Table view]LER 94-001-00:on 940412,discovered That Total Pressure Offset Constant in Error.Caused by Technician Error. Procedure Will Be Revised to Prevent recurrence.W/940512 Ltr ML20029D7761994-05-0404 May 1994 LER 94-002-00:on 940303,noble Gas Monitor in R-35 Did Not Respond When source-checked During Surveillance.Caused by Component Failure.Corrective Actions:Monitor Repaired & Returned to svc.W/940504 Ltr ML20046A9151993-07-26026 July 1993 LER 93-007-01:on 930413,discovered That Valves Required to Mitigate Consequences of Accident Not Included in Section XI ISI & Testing Program.On 930624,identified Six Addl Valve Inappropriately Ommitted from Subj Program.Valves Included ML20046A8931993-07-23023 July 1993 LER 93-008-00:on 930624,observed That Valve CV-31740, Instrument Air to Unit 1 Containment Closed Due to Failure of Coil in Solenoid Operated Pilot Valve.Valve Reopened Locally to Restore Instrument air.W/930723 Ltr ML20044D2241993-05-13013 May 1993 LER 93-007-00:on 930413,discovered That Certain Feedwater Valves,Required to Mitigate Consequences of Accident,Not Included in ASME Section XI ISI & Test Program.Caused by Failure to Interpret Requirements.Valves Tested ML20044D2181993-05-13013 May 1993 LER 93-002-00:on 930403,containment Isolation Valve Which Controls Reactor Makeup Water to Containment Exceeded Max Time for Closure.On 930413,lockwire & Safety Tag Removed. Caused by Communication Errors.Safety Tag Process Reviewed ML20024G7001991-04-22022 April 1991 LER 91-002-00:on 910323,auto-start of Control Room Special Ventilation Sys Occurred.Caused by Spike on Newly Installed Radiation Monitor.Wiring Changed to Provide Time Delay Feature for Remaining Four modules.W/910422 Ltr ML20043B6041990-05-24024 May 1990 LER 90-004-00:on 900424,discovered That Surveillance Test SP1042, Resistance Temp Detector Bypass Flow Meter Functional Test Not Performed within Required Time Period. Caused by Personnel Error.Test performed.W/900524 Ltr ML20043E3761990-05-18018 May 1990 LER 90-007-00:on 900517,discovered That Several Relays Deenergized & Automatic Start & Loading of Diesel Generator D1 Initiated.Caused by Inadequate Design.Mod Initiated to Install Test points.W/900608 Ltr ML20042F5681990-05-0404 May 1990 LER 89-021-01:on 891212,chlorine Monitors on One Train of Control Room Ventilation Inoperable for More than 11 H. Caused by Personnel Error.Operating Procedure for Chlorine Monitoring Sys Issued & Training provided.W/900504 Ltr ML20006A9721990-01-22022 January 1990 LER 89-004-00:on 891221,unit Tripped & Reactor Coolant Pumps Lost Power.Caused by Faulty Voltage Regulation of One CRD Mechanism motor-generator Set.Regulator for Set Replaced & Tested.On 891226,identical Trip occurred.W/900122 Ltr ML20005G3731990-01-11011 January 1990 LER 89-021-00:on 891211,computer Alarmed Indicating Malfunction of Chlorine Monitors 121 & 122 & Leaving Control Room Ventilation Sys Inoperable for More than 11 H.Caused by Personnel Error.Monitor 122 Returned to normal.W/900111 Ltr ML19351A4681989-12-11011 December 1989 LER 89-020-00:on 891108,17,20,23,1201 & 08,automatic Isolation of Control Room Supply & Exhaust Occurred.Caused by Malfunctions of Chlorine Gas Detectors.Addl Monitors Installed & Actuation Logic modified.W/891211 Ltr ML20005D7071989-11-30030 November 1989 LER 89-018-01:on 891024,25,31 & 1112,control Room Received High Radiation Alarm Which Initiated Automatic Start of Auxiliary Bldg Special Ventilation Sys.Caused by Radiation Monitor Spikes.Monitor Modules replaced.W/891130 Ltr ML19332C6241989-11-22022 November 1989 LER 89-003-00:on 891023,measured Leakage Rate Exceeded Tech Specs Limit While Performing Surveillance Test Sp 2136. Caused by Wear of Grafoil Packing Due to High Frequency of Door Usage.Test Procedures modified.W/891122 Ltr ML19332C6171989-11-22022 November 1989 LER 89-018-00:on 891024,25 & 1112,control Room Received Train a High Radiation Alarm,Initiating Automatic Start of Auxiliary Bldg Special Ventilation Sys.Caused by Spike of Radiation Monitor.Monitor replaced.W/891122 Ltr ML19332C7001989-11-20020 November 1989 LER 89-019-00:on 891025,Train a of Auxiliary Bldg Special Ventilation Sys Started Automatically When Power Mistakenly Turned Off.Caused by Personnel Error.Involved Personnel Counseled.Clarifying Revs Made to procedure.W/891121 Ltr ML19325D4901989-10-16016 October 1989 LER 89-017-00:on 890914,discovered That Present Position of Transfer Switch for Power Supplying Control & Protection Relays for Diesel Generator Does Not Meet Requirements of App R.Caused by Inadequate procedures.W/891016 Ltr ML19325C7491989-10-10010 October 1989 LER 89-016-00:on 890908,control Room Received Train B High Radiation Alarm,Which Initiated Automatic Start of Auxiliary Bldg Special Ventilation Sys.Caused by Spike on Radiation Monitor 2R-30.Monitor Upgrade Being pursued.W/891010 Ltr ML19325C1981989-10-0505 October 1989 LER 89-014-00:on 890905,operations Personnel Recalled That SP1093.1 Performed Two Wks Previously Instead of SP1093.2. Caused by Personnel Error in Selecting Incorrect Procedure. Proper Notifications Made & SP1093.2 performed.W/891005 Ltr ML19325C1991989-10-0505 October 1989 LER 89-015-00:on 890905 & 23,special Ventilation Sys of Control Rooms 122 & 121 Actuated Automatically.Caused by False High Chlorine Signal & Broken Chlorine Sensitive Paper Tape,Respectively.Detectors repaired.W/891005 Ltr ML20050A8331982-03-24024 March 1982 LER 82-004/03L-0:on 820226,maint Workman Accidentally Bumped Overspeed Trip Mechanism on Auxiliary Feedwater Pump, Tripping Valve & Making Pump Inoperable.Caused by Personnel Error.Valve Operator Reset ML20042A5101982-03-12012 March 1982 LER 82-003/03L-0:on 820209,during Annual Visual Insp,One Steam Exclusion Control Damper Found Inoperable.Caused by Failure of Drive Gear in Pacific Air Products Damper Model R-35-FS.Gear Replaced ML20040A5671982-01-15015 January 1982 LER 81-030/03L-0:on 811210,degraded Voltage Relay 27A1/B25 Found W/Voltage Setpoint Outside Allowable Band.Causes Being Considered Are Last Calibr Error & Unfamiliarity W/Time Delay Relay Characteristics ML20039E5521981-12-30030 December 1981 LER 81-031/01T-0:on 811216,during Transfer of Spent Fuel in Preparation for Reracking of Pool 2,spent Fuel Assembly Top Nozzle Separated,Causing Assembly to Tip Toward Edge of Pool.Cause Unknown.Fuel Handling Operations Suspended ML20039C2681981-12-16016 December 1981 LER 81-027/03L-0:on 811116,discovered That Pre,Absolute & Charcoal Filter Test Not Done on 11 Shield Bldg Ventilation Sys Replacement on 811112.Caused by Procedural Inadequacies & Poor Communications ML20004D5131981-06-0505 June 1981 LER 81-006/03L-0:on 810507,charging Pump 121 Drive Unit Failed.Caused by Bearing Failure in Varidrive Unit.Damaged Parts Replaced ML20003H9831981-05-0505 May 1981 LER 81-004/03L-0:on 810406,during testing,turbine-driven Auxiliary Feedwater Pump 22 Failed to Come Up to Rated Speed.Caused by Low Governor Setting.Governor Adjusted to Proper Speed ML20003F4861981-04-14014 April 1981 LER 81-003/03L-0:on 810316,during Surveillance Test,Steam Exclusion Damper Actuation Setpoint Exceeded Limit.Caused by Foxboro Model 63U-CC-OHDR-F 6 Bistable Drift.Instrument Recalibr & Tested Satisfactorily ML19345B1201980-11-21021 November 1980 LER 80-034/03L-0:on 801031,auxiliary Bldg Special Vent Exhaust Fan 122 Tripped.Caused by Actuation of Thermal Overload Protective Device.Device Replaced ML19339B1991980-10-31031 October 1980 LER 80-028/03L-0:on 801003,previously Acknowledged Annunciator Indicating Fan Coil Unit 24 Was Noticed in Local Control.Caused by Personnel Error.Switch Returned to Remote & Personnel Cautioned to Exercise Care ML19338F5501980-10-15015 October 1980 LER 80-026/03L-0:on 800916,while Performing Fire Protection Mod Work in Auxiliary Feedwater Pump 22,workman Accidentally Bumped Overspeed Trip Mechanism,Tripping Valve & Making Pump Inoperable for 15 Minutes.Caused by Personnel Error ML19338F5141980-10-13013 October 1980 Updated LER 80-10/03L Dtd 801008,has Been Cancelled ML19347B6351980-10-0808 October 1980 Updated LER 80-010/03L-1:on 800311,containment Vacuum Breaker Isolation Valve 11 Opened at 0.57 Psi Rather than 0.5 Psi.Caused by Drift in Differential Pressure Switch. Setpoint Adjusted & Satisfactorily Tested ML19347B6461980-10-0808 October 1980 Updated LER 80-024/03L-0:on 800829,failed to Perform Inservice Insp of Safety Injection Nozzle to Shell Weld of Both Reactor Vessels.Caused by Unavailability of Test Equipment.Tech Spec & ASME Code Revisions Requested ML19347A9431980-09-25025 September 1980 Updated LER 80-025/01T-1:on 800904,ultrasonic Examination of Steam Generator Support Bolts Revealed That Most Had Crack Indications.Preliminary Cause Suggests Environmentally Assisted Cracking ML19330B4661980-07-29029 July 1980 LER 80-020/01T-0:on 800715,during Severe Electrical Storm Several Breakers Operated.Main Generator Was Separated from Grid & Reactor & Reactor Coolant Pumps Tripped.Caused by Electrical Storm.Next Day Conditions Returned to Normal ML19330A8721980-07-24024 July 1980 LER 80-019/03L-0:on 800630,two Power Range High Power Trip Setpoints Were Over Tech Spec Limit.Caused by Personnel Error.Rept Reviewed & Technicians Cautioned ML19320D5061980-07-15015 July 1980 LER 80-018/01T-0:on 800701,unit Was Shut Down Due to Leaking Tube in Hot Leg of Vertical Steam Generator 12,Westinghouse Series 51.Cause Not Stated.Defective Tube Will Be Plugged ML19320D4491980-07-14014 July 1980 LER 80-017/03L-0:on 800615,during Normal Operation,Found One Charging Pump Out of Svc.Charge Pump 23 Started & Shut Down.Caused by Air Leaks on Speed Control Unit Due to Broken Packing Ring.Packing Ring Replaced ML19318C0651980-06-27027 June 1980 Updated LER 80-009/03L-1:on 800310,during Normal Operation, Nuclear Power Range Channel 1N44 Was Inoperable for Few Minutes.High Voltage Supply for Detector Latched Up Due to Spike on Yellow Instrument Bus ML19318C4941980-06-27027 June 1980 LER 80-016/03L-0:on 800529,during Instrument Calibr, Instrument Was Dropped on Trip Throttle Valve Linkage, Tripping Valve & Making Pump Inoperable for 3 Minutes. Caused by Personnel Error ML19323G1721980-05-23023 May 1980 Supplementary LER 80-003/01X-2:on 800109,during Eddy Current Testing of Tubes in Unit 2 Steam Generators,Several Indications of Tube Degradation Were Observed.Cause Unstated.Several Tubes Plugged & One Removed for Exam ML19323C6301980-05-13013 May 1980 LER 80-015/01T-0:on 800429,containment Maint Airlock Showed Leakage Greater than Tech Spec Limit.Caused by Degradation of Airlock Door Seal.Inner Door Seals Replaced & Leak Tested Satisfactorily ML19309H6111980-05-0909 May 1980 LER 80-013/03L-0:on 800411,while Performing Maint,Workman Accidentally Tripped Overspeed Valve for turbine-driven Auxiliary Feedwater Pump 22.Valve Immediately Reset ML19309H5971980-05-0909 May 1980 LER 80-014/03L-0:on 800410,during Surveillance Test,One Overpower Delta T Setpoint Was Found to Trip About 70% Above Desired Setpoint.Caused by Intermittent Capacitor.Capacitor Was Replaced ML19309G4051980-04-30030 April 1980 LER 80-012/03L-0:on 800331,during Review of Electrical Surveillance Program,Discovered That Individual Float Cell Voltage Measurements Were Not Done in Mar 1980 on Battery Monthly Test.Caused by Personnel Oversight ML19305E3201980-04-17017 April 1980 Updated LER 80-010/03L-1: Cause Code & Component Manufacturer Corrected ML19309E1001980-04-11011 April 1980 LER 80-011/03L-0:on 800312,motor Breaker of Charging Pump 22 Would Not Stay Closed.Pump Stopped.Caused by Failed Tfk Breaker.Breaker Replaced ML19305D8401980-04-10010 April 1980 LER 80-010/03L-0:on 800311,during Surveillance Test, Containment Isolation Valve 11 Opened at 0.57 Psi.Caused by Apparent Drift in Barton Model 288A Differential Pressure Switch.Setpoint Adjusted & Valve Retested Satisfactorily 1994-05-04 Category:RO) MONTHYEARML20029E4701994-05-12012 May 1994
[Table view]LER 94-001-00:on 940412,discovered That Total Pressure Offset Constant in Error.Caused by Technician Error. Procedure Will Be Revised to Prevent recurrence.W/940512 Ltr ML20029D7761994-05-0404 May 1994 LER 94-002-00:on 940303,noble Gas Monitor in R-35 Did Not Respond When source-checked During Surveillance.Caused by Component Failure.Corrective Actions:Monitor Repaired & Returned to svc.W/940504 Ltr ML20046A9151993-07-26026 July 1993 LER 93-007-01:on 930413,discovered That Valves Required to Mitigate Consequences of Accident Not Included in Section XI ISI & Testing Program.On 930624,identified Six Addl Valve Inappropriately Ommitted from Subj Program.Valves Included ML20046A8931993-07-23023 July 1993 LER 93-008-00:on 930624,observed That Valve CV-31740, Instrument Air to Unit 1 Containment Closed Due to Failure of Coil in Solenoid Operated Pilot Valve.Valve Reopened Locally to Restore Instrument air.W/930723 Ltr ML20044D2241993-05-13013 May 1993 LER 93-007-00:on 930413,discovered That Certain Feedwater Valves,Required to Mitigate Consequences of Accident,Not Included in ASME Section XI ISI & Test Program.Caused by Failure to Interpret Requirements.Valves Tested ML20044D2181993-05-13013 May 1993 LER 93-002-00:on 930403,containment Isolation Valve Which Controls Reactor Makeup Water to Containment Exceeded Max Time for Closure.On 930413,lockwire & Safety Tag Removed. Caused by Communication Errors.Safety Tag Process Reviewed ML20024G7001991-04-22022 April 1991 LER 91-002-00:on 910323,auto-start of Control Room Special Ventilation Sys Occurred.Caused by Spike on Newly Installed Radiation Monitor.Wiring Changed to Provide Time Delay Feature for Remaining Four modules.W/910422 Ltr ML20043B6041990-05-24024 May 1990 LER 90-004-00:on 900424,discovered That Surveillance Test SP1042, Resistance Temp Detector Bypass Flow Meter Functional Test Not Performed within Required Time Period. Caused by Personnel Error.Test performed.W/900524 Ltr ML20043E3761990-05-18018 May 1990 LER 90-007-00:on 900517,discovered That Several Relays Deenergized & Automatic Start & Loading of Diesel Generator D1 Initiated.Caused by Inadequate Design.Mod Initiated to Install Test points.W/900608 Ltr ML20042F5681990-05-0404 May 1990 LER 89-021-01:on 891212,chlorine Monitors on One Train of Control Room Ventilation Inoperable for More than 11 H. Caused by Personnel Error.Operating Procedure for Chlorine Monitoring Sys Issued & Training provided.W/900504 Ltr ML20006A9721990-01-22022 January 1990 LER 89-004-00:on 891221,unit Tripped & Reactor Coolant Pumps Lost Power.Caused by Faulty Voltage Regulation of One CRD Mechanism motor-generator Set.Regulator for Set Replaced & Tested.On 891226,identical Trip occurred.W/900122 Ltr ML20005G3731990-01-11011 January 1990 LER 89-021-00:on 891211,computer Alarmed Indicating Malfunction of Chlorine Monitors 121 & 122 & Leaving Control Room Ventilation Sys Inoperable for More than 11 H.Caused by Personnel Error.Monitor 122 Returned to normal.W/900111 Ltr ML19351A4681989-12-11011 December 1989 LER 89-020-00:on 891108,17,20,23,1201 & 08,automatic Isolation of Control Room Supply & Exhaust Occurred.Caused by Malfunctions of Chlorine Gas Detectors.Addl Monitors Installed & Actuation Logic modified.W/891211 Ltr ML20005D7071989-11-30030 November 1989 LER 89-018-01:on 891024,25,31 & 1112,control Room Received High Radiation Alarm Which Initiated Automatic Start of Auxiliary Bldg Special Ventilation Sys.Caused by Radiation Monitor Spikes.Monitor Modules replaced.W/891130 Ltr ML19332C6241989-11-22022 November 1989 LER 89-003-00:on 891023,measured Leakage Rate Exceeded Tech Specs Limit While Performing Surveillance Test Sp 2136. Caused by Wear of Grafoil Packing Due to High Frequency of Door Usage.Test Procedures modified.W/891122 Ltr ML19332C6171989-11-22022 November 1989 LER 89-018-00:on 891024,25 & 1112,control Room Received Train a High Radiation Alarm,Initiating Automatic Start of Auxiliary Bldg Special Ventilation Sys.Caused by Spike of Radiation Monitor.Monitor replaced.W/891122 Ltr ML19332C7001989-11-20020 November 1989 LER 89-019-00:on 891025,Train a of Auxiliary Bldg Special Ventilation Sys Started Automatically When Power Mistakenly Turned Off.Caused by Personnel Error.Involved Personnel Counseled.Clarifying Revs Made to procedure.W/891121 Ltr ML19325D4901989-10-16016 October 1989 LER 89-017-00:on 890914,discovered That Present Position of Transfer Switch for Power Supplying Control & Protection Relays for Diesel Generator Does Not Meet Requirements of App R.Caused by Inadequate procedures.W/891016 Ltr ML19325C7491989-10-10010 October 1989 LER 89-016-00:on 890908,control Room Received Train B High Radiation Alarm,Which Initiated Automatic Start of Auxiliary Bldg Special Ventilation Sys.Caused by Spike on Radiation Monitor 2R-30.Monitor Upgrade Being pursued.W/891010 Ltr ML19325C1981989-10-0505 October 1989 LER 89-014-00:on 890905,operations Personnel Recalled That SP1093.1 Performed Two Wks Previously Instead of SP1093.2. Caused by Personnel Error in Selecting Incorrect Procedure. Proper Notifications Made & SP1093.2 performed.W/891005 Ltr ML19325C1991989-10-0505 October 1989 LER 89-015-00:on 890905 & 23,special Ventilation Sys of Control Rooms 122 & 121 Actuated Automatically.Caused by False High Chlorine Signal & Broken Chlorine Sensitive Paper Tape,Respectively.Detectors repaired.W/891005 Ltr ML20050A8331982-03-24024 March 1982 LER 82-004/03L-0:on 820226,maint Workman Accidentally Bumped Overspeed Trip Mechanism on Auxiliary Feedwater Pump, Tripping Valve & Making Pump Inoperable.Caused by Personnel Error.Valve Operator Reset ML20042A5101982-03-12012 March 1982 LER 82-003/03L-0:on 820209,during Annual Visual Insp,One Steam Exclusion Control Damper Found Inoperable.Caused by Failure of Drive Gear in Pacific Air Products Damper Model R-35-FS.Gear Replaced ML20040A5671982-01-15015 January 1982 LER 81-030/03L-0:on 811210,degraded Voltage Relay 27A1/B25 Found W/Voltage Setpoint Outside Allowable Band.Causes Being Considered Are Last Calibr Error & Unfamiliarity W/Time Delay Relay Characteristics ML20039E5521981-12-30030 December 1981 LER 81-031/01T-0:on 811216,during Transfer of Spent Fuel in Preparation for Reracking of Pool 2,spent Fuel Assembly Top Nozzle Separated,Causing Assembly to Tip Toward Edge of Pool.Cause Unknown.Fuel Handling Operations Suspended ML20039C2681981-12-16016 December 1981 LER 81-027/03L-0:on 811116,discovered That Pre,Absolute & Charcoal Filter Test Not Done on 11 Shield Bldg Ventilation Sys Replacement on 811112.Caused by Procedural Inadequacies & Poor Communications ML20004D5131981-06-0505 June 1981 LER 81-006/03L-0:on 810507,charging Pump 121 Drive Unit Failed.Caused by Bearing Failure in Varidrive Unit.Damaged Parts Replaced ML20003H9831981-05-0505 May 1981 LER 81-004/03L-0:on 810406,during testing,turbine-driven Auxiliary Feedwater Pump 22 Failed to Come Up to Rated Speed.Caused by Low Governor Setting.Governor Adjusted to Proper Speed ML20003F4861981-04-14014 April 1981 LER 81-003/03L-0:on 810316,during Surveillance Test,Steam Exclusion Damper Actuation Setpoint Exceeded Limit.Caused by Foxboro Model 63U-CC-OHDR-F 6 Bistable Drift.Instrument Recalibr & Tested Satisfactorily ML19345B1201980-11-21021 November 1980 LER 80-034/03L-0:on 801031,auxiliary Bldg Special Vent Exhaust Fan 122 Tripped.Caused by Actuation of Thermal Overload Protective Device.Device Replaced ML19339B1991980-10-31031 October 1980 LER 80-028/03L-0:on 801003,previously Acknowledged Annunciator Indicating Fan Coil Unit 24 Was Noticed in Local Control.Caused by Personnel Error.Switch Returned to Remote & Personnel Cautioned to Exercise Care ML19338F5501980-10-15015 October 1980 LER 80-026/03L-0:on 800916,while Performing Fire Protection Mod Work in Auxiliary Feedwater Pump 22,workman Accidentally Bumped Overspeed Trip Mechanism,Tripping Valve & Making Pump Inoperable for 15 Minutes.Caused by Personnel Error ML19338F5141980-10-13013 October 1980 Updated LER 80-10/03L Dtd 801008,has Been Cancelled ML19347B6351980-10-0808 October 1980 Updated LER 80-010/03L-1:on 800311,containment Vacuum Breaker Isolation Valve 11 Opened at 0.57 Psi Rather than 0.5 Psi.Caused by Drift in Differential Pressure Switch. Setpoint Adjusted & Satisfactorily Tested ML19347B6461980-10-0808 October 1980 Updated LER 80-024/03L-0:on 800829,failed to Perform Inservice Insp of Safety Injection Nozzle to Shell Weld of Both Reactor Vessels.Caused by Unavailability of Test Equipment.Tech Spec & ASME Code Revisions Requested ML19347A9431980-09-25025 September 1980 Updated LER 80-025/01T-1:on 800904,ultrasonic Examination of Steam Generator Support Bolts Revealed That Most Had Crack Indications.Preliminary Cause Suggests Environmentally Assisted Cracking ML19330B4661980-07-29029 July 1980 LER 80-020/01T-0:on 800715,during Severe Electrical Storm Several Breakers Operated.Main Generator Was Separated from Grid & Reactor & Reactor Coolant Pumps Tripped.Caused by Electrical Storm.Next Day Conditions Returned to Normal ML19330A8721980-07-24024 July 1980 LER 80-019/03L-0:on 800630,two Power Range High Power Trip Setpoints Were Over Tech Spec Limit.Caused by Personnel Error.Rept Reviewed & Technicians Cautioned ML19320D5061980-07-15015 July 1980 LER 80-018/01T-0:on 800701,unit Was Shut Down Due to Leaking Tube in Hot Leg of Vertical Steam Generator 12,Westinghouse Series 51.Cause Not Stated.Defective Tube Will Be Plugged ML19320D4491980-07-14014 July 1980 LER 80-017/03L-0:on 800615,during Normal Operation,Found One Charging Pump Out of Svc.Charge Pump 23 Started & Shut Down.Caused by Air Leaks on Speed Control Unit Due to Broken Packing Ring.Packing Ring Replaced ML19318C0651980-06-27027 June 1980 Updated LER 80-009/03L-1:on 800310,during Normal Operation, Nuclear Power Range Channel 1N44 Was Inoperable for Few Minutes.High Voltage Supply for Detector Latched Up Due to Spike on Yellow Instrument Bus ML19318C4941980-06-27027 June 1980 LER 80-016/03L-0:on 800529,during Instrument Calibr, Instrument Was Dropped on Trip Throttle Valve Linkage, Tripping Valve & Making Pump Inoperable for 3 Minutes. Caused by Personnel Error ML19323G1721980-05-23023 May 1980 Supplementary LER 80-003/01X-2:on 800109,during Eddy Current Testing of Tubes in Unit 2 Steam Generators,Several Indications of Tube Degradation Were Observed.Cause Unstated.Several Tubes Plugged & One Removed for Exam ML19323C6301980-05-13013 May 1980 LER 80-015/01T-0:on 800429,containment Maint Airlock Showed Leakage Greater than Tech Spec Limit.Caused by Degradation of Airlock Door Seal.Inner Door Seals Replaced & Leak Tested Satisfactorily ML19309H6111980-05-0909 May 1980 LER 80-013/03L-0:on 800411,while Performing Maint,Workman Accidentally Tripped Overspeed Valve for turbine-driven Auxiliary Feedwater Pump 22.Valve Immediately Reset ML19309H5971980-05-0909 May 1980 LER 80-014/03L-0:on 800410,during Surveillance Test,One Overpower Delta T Setpoint Was Found to Trip About 70% Above Desired Setpoint.Caused by Intermittent Capacitor.Capacitor Was Replaced ML19309G4051980-04-30030 April 1980 LER 80-012/03L-0:on 800331,during Review of Electrical Surveillance Program,Discovered That Individual Float Cell Voltage Measurements Were Not Done in Mar 1980 on Battery Monthly Test.Caused by Personnel Oversight ML19305E3201980-04-17017 April 1980 Updated LER 80-010/03L-1: Cause Code & Component Manufacturer Corrected ML19309E1001980-04-11011 April 1980 LER 80-011/03L-0:on 800312,motor Breaker of Charging Pump 22 Would Not Stay Closed.Pump Stopped.Caused by Failed Tfk Breaker.Breaker Replaced ML19305D8401980-04-10010 April 1980 LER 80-010/03L-0:on 800311,during Surveillance Test, Containment Isolation Valve 11 Opened at 0.57 Psi.Caused by Apparent Drift in Barton Model 288A Differential Pressure Switch.Setpoint Adjusted & Valve Retested Satisfactorily 1994-05-04 Category:TEXT-SAFETY REPORT MONTHYEARML20217G4461999-09-30030 September 1999
[Table view]Monthly Operating Repts for Sept 1999 for Pingp.With ML20217A9931999-09-30030 September 1999 NRC Regulatory Assessment & Oversight Pilot Program, Performance Indicator Data 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 ML20216E7151999-08-31031 August 1999 Monthly Operating Repts for Aug 1999 for Pingp,Units 1 & 2. with ML20211J2851999-08-26026 August 1999 Safety Evaluation Supporting Amends 146 & 137 to Licenses DPR-42 & DPR-60,respectively ML20211D3981999-08-24024 August 1999 Safety Evaluation Supporting Requested Actions to Licenses DPR-42 & DPR-60,respectively ML20211C2531999-08-0404 August 1999 Unit 1 ISI Summary Rept Interval 3,Period 2 Refueling Outage Dates 990425-990526 Cycle 19 971212-990526 ML20210Q4891999-07-31031 July 1999 Monthly Operating Repts for July 1999 for Pingp,Units 1 & 2. with ML20211B5971999-07-31031 July 1999 Cycle 20 Voltage-Based Repair Criteria 90-Day Rept 05000282/LER-1999-007-01, :on 990625,loss of CR Special Ventilation Function Was Noted.Caused by Broken Door Latch Pins on CR Chiller Door.Ts Amend Request to Establish Allowed OOS Time Was Submitted1999-07-23023 July 1999
ML20237D6491998-08-13013 August 1998 Safety Evaluation Supporting Amends 137 & 128 to Licenses DPR-42 & DPR-60,respectively ML20237A3961998-08-11011 August 1998 Safety Evaluation on Westinghouse Owners Group Proposed Insp Program for part-length CRDM Housing Issue.Insp Program for Type 309 Welds Inadequate from Statistical Point of View ML20237A8171998-08-0505 August 1998 SER Related to USI A-46 Program GL 87-02 Implementation for Prairie Island Nuclear Generating Plant,Units 1 & 2 1999-09-30 |
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