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Category:LICENSEE EVENT REPORT (SEE ALSO AO
MONTHYEARML20024J3271994-10-0303 October 1994 LER 94-020-00:on 940901,discovered That Elapsed Time Meters Installed in Essential CR HVAC & SGTS Due to Defective Procedures at Time of Installation.Crefs & SGTS Declared inoperable.W/941003 Ltr ML20029E5871994-05-13013 May 1994 LER 94-007-00:on 940413,HPCI Sys Declared Inoperable.Caused by Lack of Sufficient Restraint on Tubing.Corrective Action: Tubing Placed Back on Fitting & Clamp Was Retensioned.W/ 940513 Ltr ML20029C7211994-04-22022 April 1994 LER 92-020-00:on 920130,containment Level Instruments Were Removed & re-installed Without Being Declared Inoperable. Caused by Personnel Failure to Follow Procedures.Operators retrained.W/940422 Ltr ML20046B4881993-07-30030 July 1993 LER 93-028-00:on 930630,two Potentially Valves Were Inoperable Due to Inadequate Design of Valve Operators by Manufacturer.Modified Valve operators.W/930730 Ltr ML20046A3001993-07-21021 July 1993 LER 93-010-01:on 930331 & 0621,RPS Bus B Deenergized Due to Defective Under Frequency (Uf) Trip Unit Resulting in Unplanned Actuations of Several Esfs.Action Initiated to Permanently Remove Uf feature.W/930721 Ltr ML20045H6011993-07-13013 July 1993 LER 93-025-00:on 930618,determined That Hydrogen/Oxygen Monitoring Sys May Not Effectively Perform post-accident Monitoring Functions.Caused by Insufficient Slope in Lines.Filters Removed & Pump Internals Upgraded ML20045H6051993-07-13013 July 1993 LER 93-026-00:on 930618,discovered That Hydrostatic Tests of Essential Portions of Svc Water & Reactor Equipment Cooling Sys Not Performed Once Per 10 Year ISI Interval. Inclusion of Essential Sys Portion Being Reevaluated ML20045H6071993-07-13013 July 1993 LER 93-027-00:on 930308,standby Gas Treatment Sys Unable to Establish & Maintain Reactor Bldg Pressure + or - 0.25 Inches Water Gauge Under Calm Wind Conditions.Evaluation of Secondary Containment Operability in Progress ML20045E9861993-06-28028 June 1993 LER 93-023-00:on 930528,fuel Assemblies Loaded Into Reactor Core Without Control Rods Fully Inserted,In Violation of TS 3.10.A.2.Caused by Need to Reposition Fuel Support Piece. Training Will Be revised.W/930628 Ltr ML20045E6561993-06-28028 June 1993 LER 93-024-00:on 930527,discovered That Testing of Four Reactor Vessel Low Water Level RPS Sensors Not Completed as Scheduled.Caused by Personnel Error.Stroke Testing Suspended & Surveillance Testing completed.W/930628 Ltr ML20045B4701993-06-11011 June 1993 LER 93-021-00:on 930611,determined That RB Ventilation Exhaust Inboard Isolation Valve HV-AOV-261AV Inoperable & Open Due to Personnel Error.Subj Valve Manually Closed. Proposed Change to TS Will Be submitted.W/930611 Ltr ML20045A5431993-06-0505 June 1993 LER 93-020-00:on 930507,determined That H2/O2 Sys Not Leak Tested to Verify Primary Containment Integrity During Testing of Sys.Caused by Failure to Have Administrative Controls in Place.Pressure Testing conducted.W/930605 Ltr ML20045A4331993-06-0101 June 1993 LER 93-SO1-00:on 930429,discoverd That Individual Had Tested Positive for Drugs at Another Facility on 930226.Employer Had Not Previously Been Notified.Approved Contractor Access Authorization Program suspended.W/930601 Ltr ML20045A4611993-06-0101 June 1993 LER 93-019-00:on 930501,nonconservative Testing Methodology Discovered During LLRT Due to Nonconservative Interpretation of Info Supplied by Valve Mfg.Testing Conducted for Valves Not Previously tested.W/930601 Ltr ML20044G8011993-05-28028 May 1993 LER 93-017-00:on 930428,discovered That Hourly Fire Watch Patrol for RB Per TS Had Not Been Performed.Caused by Personnel Error.Review of Fire Watch Patrol Implementation Process Will Be conducted.W/930528 Ltr ML20044E6301993-05-20020 May 1993 LER 93-015-00:on 930420,design Discrepancy in HPCI Sys Identified.Caused by Design Deficiency in Original Design. Mods Will Be Made to Startup from Current Refueling Outage to Correct Design discrepancy.W/930520 Ltr ML20044D8211993-05-17017 May 1993 LER 93-014-00:on 930316,small through-wall Leak Developed on High Pressure Side of SW Throttle Valve.Caused by Inadequate Valve Design.Frequency of Visual Insp of Valve Internals Will Be Increased to Once Per cycle.W/930517 Ltr ML20044D6511993-05-15015 May 1993 LER 93-013-00:on 930415,determined That as-found Setpoint for Seven SRVs Not within TS Limit.Caused by Lift Setpoint Discrepancies of Srvs.Review of Setpoint Data Will Be performed.W/930515 Ltr ML20044D5341993-05-14014 May 1993 LER 93-012-00:on 930414,violation of Primary Containment Integrity Occurred.Caused by Personnel Error.Procedure Change Being Made to Eliminate Test Return Line Venting When Primary Containment Integrity required.W/930514 Ltr ML20044D2041993-05-12012 May 1993 LER 93-011-00:on 930308,max Differential Pressure Between Reactor Bldg & External Environ of -0.22-inches Water Gauge Exceeded TS Required Min.Caused by Lack of Loop Seal on Rupture Seal Drain Line.Seals replaced.W/930512 Ltr ML20024G7421991-04-23023 April 1991 LER 91-002-00:on 910324,RWCU Occurred Due to High Sys Temp During Plant Cooldown.Caused by Failed Temp Indication & Potential Equipment Failure.Failed Thermocouple & Temp Switch Replaced & calibr.W/910423 Ltr ML20043D2311990-05-30030 May 1990 LER 90-005-00:on 900430,reactor Protection Sys B Motor Generator Set Output Breaker Tripped.Caused by Equipment Malfunction & Preventive Maint Program Deficiency.Sys Restored to Pretrip Operational state.W/900530 Ltr ML20042G9411990-05-10010 May 1990 LER 90-004-00:on 900413,ESF Group Isolations & Diesel Generator Starts Occurred Due to Equipment Malfunction & Personnel Error.Equipment Repaired,Manual Disconnect Operating Location Labeled & Personnel trained.W/900510 Ltr ML20011F1321990-02-23023 February 1990 LER 90-001-00:on 900124,outboard Steam Supply Line Isolation Valve Unexpectedly Closed During Surveillance Testing,Causing Isolation of HPCI Sys.Caused by Procedural Inadequacy.Test Procedure Will Be upgraded.W/900223 Ltr ML20005E3331989-12-26026 December 1989 LER 89-026-00:on 891125,reactor Scram Occurred Due to Closure of Outboard Msivs.Caused by post-filter Media Ignition by Hot Air or Particles from Dryer.Air Dryer B Disassembled & inspected.W/891226 Ltr ML19332F1191989-12-0707 December 1989 LER 88-016-02:on 880517,pipe Stress Analyses Revealed That Resultant Stresses for Five Piping Segments/Components Exceed Plant Design Basis.Caused by Support Design Problems. Long-term Corrective Program implemented.W/891207 Ltr ML19325E2201989-10-27027 October 1989 LER 89-025-00:on 890928,main Turbine Trip Occurred,Followed Immediately by Reactor Scram.Caused by Spurious Actuation of Level Switch Due to Equipment Vibration.Plant Stabilized & Temporary Instruction Re Pump Shifting issued.W/891027 Ltr ML20024C3571983-06-28028 June 1983 LER 83-008/03L-0:on 830530,HFA Relay 9-17-16A K6B Contacts Failed to Open.Cause Not Determined.Relay Coil Replaced. Systematic Replacement of All Relays within 4-yr Period planned.w/830628 Ltr ML20028F0921983-01-20020 January 1983 LER 82-025/03L-0:on 821222,coil of Reactor Protection Relay 915-5AK8C Overheated.Relay Did Not Fail.Cause Undetermined. Relay Replaced & Proper Operation Verified ML20028F0781983-01-20020 January 1983 LER 82-024/03L-0:on 821221,pressure Switch RHR-PS-120A Setpoint Found Outside Range Specified in Tech Specs.Caused by Failed Diaphragm.Pressure Switch Adjusted & Subsequent Testing Showed Nonrepeatable Trip Point.Switch Replaced ML20028B4671982-11-22022 November 1982 LER 82-022/03L-0:on 821025,RHR Time Delay Relay 10A-K45A Failed to Operate within Required Time Limits.Caused by Setpoint Being Set Too Conservatively.Relay Readjusted & Correct Operation Verified ML20028B4661982-11-19019 November 1982 LER 82-021/03L-0:on 821023,relay 917-16A-K44B Failed to Open Contacts When de-energized.Cause Not Determined.Relay Replaced & Correct Operation Verified.Monitoring Program Implemented to Determine Need for Generic Replacement ML20052G5321982-05-0606 May 1982 LER 82-008/03L-0:on 820415,during Diagnostic Testing of Mechanical Snubbers,Model PSA-10 SN/544 Snubber Exceeded Specified Acceleration Rate.Caused by Improper Installation of Clutch Spring.Snubber Sent to Manufactures for Repair ML20052B4041982-04-22022 April 1982 LER 82-007/03L-0:on 820324,differential Pressure Between Drywell & Suppression Chamber Reduced Below Tech Spec Limits During RHR Test Mode Operation.Caused by Nitrogen Flow from Drywell to Suppression Chamber.Return Piping to Be Modified ML20052A3561982-04-21021 April 1982 LER 82-006/03L-0:on 820322,while Inerting Drywell,Ductwork Between Primary Containment & Reactor Bldg Ventilation Found Failed in Several Places,Preventing Oxygen Concentration & Differential Pressure from Being Established ML20050B2101982-03-19019 March 1982 LER 82-005/03L-0:on 820221,MSIV-86A Found to Have Closing Time Faster than Tech Spec.Cause Unknown.Closing Time Adjusted & Control Valve Locked Into Required Position ML20041F8271982-03-0505 March 1982 LER 82-004/03L-0:on 820109,during Planned Power Reduction, Min Critical Power Ratio Was Below Operating Limit W/O Initiation of Corrective Actions Required by Tech Specs. Caused by Personnel Error.Procedures Will Be Revised ML20041C4151982-02-18018 February 1982 LER 81-003/03L-1:on 810223,valve RHR-MO-26B Motor Current Increased & Remained High When Valve Reached Closed Position.Valve Motor Breaker Manually Tripped & Valve Declared Inoperable.Caused by Failure of Brake Coil ML20041C3881982-02-17017 February 1982 LER 82-003/03L-0:on 820126,overload Alarm Condition Received While Closing Valve RHR-MO-26B,caused by Motor Brake Coil Failing to Release.New Motor & Brake Installed & Tested Satisfactorily ML20041C3741982-02-17017 February 1982 LER 82-002/03L-0:on 820121,during Routine Surveillance Testing NBI-LIS-101A Found to Trip at Lower than Tech Spec Limits.Caused by Barton Model 288 Switch Actuating at Random Positions.Switch Replaced ML20041C3871982-02-17017 February 1982 LER 82-001/03L-0:on 820122,reactor Vessel Level Switch NBI-LIS-72C Failed to Trip at Tech Spec Setpoint.Caused by Misalignment of Switch Mechanism.New Switch Calibr & Installed ML20040D3491982-01-20020 January 1982 LER 81-026/03L-0:on 811223,switches NBI-LIS-01A & NBI-LIS- 101B Found Set at Level Lower That Tech Spec Limits.Caused by Setpoint Drift.Switches Returned to Correct Setpoints. Instrument Drift to Be Closely Monitored ML20040D9261982-01-0505 January 1982 LER 81-025/04T-0:on 811224,during Full Power,Discharge Was Made from Floor Drain Sample Tank W/O Adequate Sampling & Analysis of Batch.Caused by Personnel Error.Liquid Discharge Procedures Being Revised.Personnel Reprimanded ML20038C5321981-12-0303 December 1981 LER 81-024/03L-0:on 811106,safety Relief Valve 71-D Failed to Close After Test.Caused by Failure of Solenoid Plunger to Drop Out When Solenoid de-energized.Solenoid Replaced ML20010G0961981-08-25025 August 1981 LER 81-020/03L-0: on 810728, During Procedure Returning Diesel Generator 1 to Svc After Flexible Fuel Line Leak, Control Air Line Fitting Failed Causing Generator to Shut Down. Caused by Broken Air Line Due to Crimped Ferrule ML20010F9881981-08-25025 August 1981 LER 81-019/03L-0:on 810728,during Surveillance to Prove Operability of Diesel Generator 1,fuel Supply Hose Developed Leak.Caused by Excessive Localized Flexure & Vibration. Hose Replaced ML20010G2661981-08-25025 August 1981 LER 81-021/03L-0:on 810728,during Performance of Surveillance Procedure on Diesel Generator 2,injection Line Failed.Caused by Metal Fatigue & Vibration.Component Replaced ML20010A1391981-07-22022 July 1981 LER 81-018/03L-0:on 810625,pressure Switch NBI-PS-52A Found W/Trip Point Less Conservative than Tech Spec.Apparently Caused by Setpoint Drift.Switch Readjusted.Setpoints for Switches Reset ML20010A1671981-07-13013 July 1981 LER 81-017/03L-0:on 810613,reactor Core Isolation Cooling Sys Steam Supply Valve RCIC-MOV-M016 Failed to Open.Caused by Improperly Wired Motor Operator Circuit.Jumper Installed ML20010A5391981-07-0909 July 1981 LER 81-016/03L-0:on 810610,core Thermal Power Calculation Performed by Process Computer Found Incorrect Due to Incorrect Feedwater Flow Value in Computer.Caused by Personnel Error in Changing Conversion Coefficient 1994-05-13
[Table view] Category:RO)
MONTHYEARML20024J3271994-10-0303 October 1994 LER 94-020-00:on 940901,discovered That Elapsed Time Meters Installed in Essential CR HVAC & SGTS Due to Defective Procedures at Time of Installation.Crefs & SGTS Declared inoperable.W/941003 Ltr ML20029E5871994-05-13013 May 1994 LER 94-007-00:on 940413,HPCI Sys Declared Inoperable.Caused by Lack of Sufficient Restraint on Tubing.Corrective Action: Tubing Placed Back on Fitting & Clamp Was Retensioned.W/ 940513 Ltr ML20029C7211994-04-22022 April 1994 LER 92-020-00:on 920130,containment Level Instruments Were Removed & re-installed Without Being Declared Inoperable. Caused by Personnel Failure to Follow Procedures.Operators retrained.W/940422 Ltr ML20046B4881993-07-30030 July 1993 LER 93-028-00:on 930630,two Potentially Valves Were Inoperable Due to Inadequate Design of Valve Operators by Manufacturer.Modified Valve operators.W/930730 Ltr ML20046A3001993-07-21021 July 1993 LER 93-010-01:on 930331 & 0621,RPS Bus B Deenergized Due to Defective Under Frequency (Uf) Trip Unit Resulting in Unplanned Actuations of Several Esfs.Action Initiated to Permanently Remove Uf feature.W/930721 Ltr ML20045H6011993-07-13013 July 1993 LER 93-025-00:on 930618,determined That Hydrogen/Oxygen Monitoring Sys May Not Effectively Perform post-accident Monitoring Functions.Caused by Insufficient Slope in Lines.Filters Removed & Pump Internals Upgraded ML20045H6051993-07-13013 July 1993 LER 93-026-00:on 930618,discovered That Hydrostatic Tests of Essential Portions of Svc Water & Reactor Equipment Cooling Sys Not Performed Once Per 10 Year ISI Interval. Inclusion of Essential Sys Portion Being Reevaluated ML20045H6071993-07-13013 July 1993 LER 93-027-00:on 930308,standby Gas Treatment Sys Unable to Establish & Maintain Reactor Bldg Pressure + or - 0.25 Inches Water Gauge Under Calm Wind Conditions.Evaluation of Secondary Containment Operability in Progress ML20045E9861993-06-28028 June 1993 LER 93-023-00:on 930528,fuel Assemblies Loaded Into Reactor Core Without Control Rods Fully Inserted,In Violation of TS 3.10.A.2.Caused by Need to Reposition Fuel Support Piece. Training Will Be revised.W/930628 Ltr ML20045E6561993-06-28028 June 1993 LER 93-024-00:on 930527,discovered That Testing of Four Reactor Vessel Low Water Level RPS Sensors Not Completed as Scheduled.Caused by Personnel Error.Stroke Testing Suspended & Surveillance Testing completed.W/930628 Ltr ML20045B4701993-06-11011 June 1993 LER 93-021-00:on 930611,determined That RB Ventilation Exhaust Inboard Isolation Valve HV-AOV-261AV Inoperable & Open Due to Personnel Error.Subj Valve Manually Closed. Proposed Change to TS Will Be submitted.W/930611 Ltr ML20045A5431993-06-0505 June 1993 LER 93-020-00:on 930507,determined That H2/O2 Sys Not Leak Tested to Verify Primary Containment Integrity During Testing of Sys.Caused by Failure to Have Administrative Controls in Place.Pressure Testing conducted.W/930605 Ltr ML20045A4331993-06-0101 June 1993 LER 93-SO1-00:on 930429,discoverd That Individual Had Tested Positive for Drugs at Another Facility on 930226.Employer Had Not Previously Been Notified.Approved Contractor Access Authorization Program suspended.W/930601 Ltr ML20045A4611993-06-0101 June 1993 LER 93-019-00:on 930501,nonconservative Testing Methodology Discovered During LLRT Due to Nonconservative Interpretation of Info Supplied by Valve Mfg.Testing Conducted for Valves Not Previously tested.W/930601 Ltr ML20044G8011993-05-28028 May 1993 LER 93-017-00:on 930428,discovered That Hourly Fire Watch Patrol for RB Per TS Had Not Been Performed.Caused by Personnel Error.Review of Fire Watch Patrol Implementation Process Will Be conducted.W/930528 Ltr ML20044E6301993-05-20020 May 1993 LER 93-015-00:on 930420,design Discrepancy in HPCI Sys Identified.Caused by Design Deficiency in Original Design. Mods Will Be Made to Startup from Current Refueling Outage to Correct Design discrepancy.W/930520 Ltr ML20044D8211993-05-17017 May 1993 LER 93-014-00:on 930316,small through-wall Leak Developed on High Pressure Side of SW Throttle Valve.Caused by Inadequate Valve Design.Frequency of Visual Insp of Valve Internals Will Be Increased to Once Per cycle.W/930517 Ltr ML20044D6511993-05-15015 May 1993 LER 93-013-00:on 930415,determined That as-found Setpoint for Seven SRVs Not within TS Limit.Caused by Lift Setpoint Discrepancies of Srvs.Review of Setpoint Data Will Be performed.W/930515 Ltr ML20044D5341993-05-14014 May 1993 LER 93-012-00:on 930414,violation of Primary Containment Integrity Occurred.Caused by Personnel Error.Procedure Change Being Made to Eliminate Test Return Line Venting When Primary Containment Integrity required.W/930514 Ltr ML20044D2041993-05-12012 May 1993 LER 93-011-00:on 930308,max Differential Pressure Between Reactor Bldg & External Environ of -0.22-inches Water Gauge Exceeded TS Required Min.Caused by Lack of Loop Seal on Rupture Seal Drain Line.Seals replaced.W/930512 Ltr ML20024G7421991-04-23023 April 1991 LER 91-002-00:on 910324,RWCU Occurred Due to High Sys Temp During Plant Cooldown.Caused by Failed Temp Indication & Potential Equipment Failure.Failed Thermocouple & Temp Switch Replaced & calibr.W/910423 Ltr ML20043D2311990-05-30030 May 1990 LER 90-005-00:on 900430,reactor Protection Sys B Motor Generator Set Output Breaker Tripped.Caused by Equipment Malfunction & Preventive Maint Program Deficiency.Sys Restored to Pretrip Operational state.W/900530 Ltr ML20042G9411990-05-10010 May 1990 LER 90-004-00:on 900413,ESF Group Isolations & Diesel Generator Starts Occurred Due to Equipment Malfunction & Personnel Error.Equipment Repaired,Manual Disconnect Operating Location Labeled & Personnel trained.W/900510 Ltr ML20011F1321990-02-23023 February 1990 LER 90-001-00:on 900124,outboard Steam Supply Line Isolation Valve Unexpectedly Closed During Surveillance Testing,Causing Isolation of HPCI Sys.Caused by Procedural Inadequacy.Test Procedure Will Be upgraded.W/900223 Ltr ML20005E3331989-12-26026 December 1989 LER 89-026-00:on 891125,reactor Scram Occurred Due to Closure of Outboard Msivs.Caused by post-filter Media Ignition by Hot Air or Particles from Dryer.Air Dryer B Disassembled & inspected.W/891226 Ltr ML19332F1191989-12-0707 December 1989 LER 88-016-02:on 880517,pipe Stress Analyses Revealed That Resultant Stresses for Five Piping Segments/Components Exceed Plant Design Basis.Caused by Support Design Problems. Long-term Corrective Program implemented.W/891207 Ltr ML19325E2201989-10-27027 October 1989 LER 89-025-00:on 890928,main Turbine Trip Occurred,Followed Immediately by Reactor Scram.Caused by Spurious Actuation of Level Switch Due to Equipment Vibration.Plant Stabilized & Temporary Instruction Re Pump Shifting issued.W/891027 Ltr ML20024C3571983-06-28028 June 1983 LER 83-008/03L-0:on 830530,HFA Relay 9-17-16A K6B Contacts Failed to Open.Cause Not Determined.Relay Coil Replaced. Systematic Replacement of All Relays within 4-yr Period planned.w/830628 Ltr ML20028F0921983-01-20020 January 1983 LER 82-025/03L-0:on 821222,coil of Reactor Protection Relay 915-5AK8C Overheated.Relay Did Not Fail.Cause Undetermined. Relay Replaced & Proper Operation Verified ML20028F0781983-01-20020 January 1983 LER 82-024/03L-0:on 821221,pressure Switch RHR-PS-120A Setpoint Found Outside Range Specified in Tech Specs.Caused by Failed Diaphragm.Pressure Switch Adjusted & Subsequent Testing Showed Nonrepeatable Trip Point.Switch Replaced ML20028B4671982-11-22022 November 1982 LER 82-022/03L-0:on 821025,RHR Time Delay Relay 10A-K45A Failed to Operate within Required Time Limits.Caused by Setpoint Being Set Too Conservatively.Relay Readjusted & Correct Operation Verified ML20028B4661982-11-19019 November 1982 LER 82-021/03L-0:on 821023,relay 917-16A-K44B Failed to Open Contacts When de-energized.Cause Not Determined.Relay Replaced & Correct Operation Verified.Monitoring Program Implemented to Determine Need for Generic Replacement ML20052G5321982-05-0606 May 1982 LER 82-008/03L-0:on 820415,during Diagnostic Testing of Mechanical Snubbers,Model PSA-10 SN/544 Snubber Exceeded Specified Acceleration Rate.Caused by Improper Installation of Clutch Spring.Snubber Sent to Manufactures for Repair ML20052B4041982-04-22022 April 1982 LER 82-007/03L-0:on 820324,differential Pressure Between Drywell & Suppression Chamber Reduced Below Tech Spec Limits During RHR Test Mode Operation.Caused by Nitrogen Flow from Drywell to Suppression Chamber.Return Piping to Be Modified ML20052A3561982-04-21021 April 1982 LER 82-006/03L-0:on 820322,while Inerting Drywell,Ductwork Between Primary Containment & Reactor Bldg Ventilation Found Failed in Several Places,Preventing Oxygen Concentration & Differential Pressure from Being Established ML20050B2101982-03-19019 March 1982 LER 82-005/03L-0:on 820221,MSIV-86A Found to Have Closing Time Faster than Tech Spec.Cause Unknown.Closing Time Adjusted & Control Valve Locked Into Required Position ML20041F8271982-03-0505 March 1982 LER 82-004/03L-0:on 820109,during Planned Power Reduction, Min Critical Power Ratio Was Below Operating Limit W/O Initiation of Corrective Actions Required by Tech Specs. Caused by Personnel Error.Procedures Will Be Revised ML20041C4151982-02-18018 February 1982 LER 81-003/03L-1:on 810223,valve RHR-MO-26B Motor Current Increased & Remained High When Valve Reached Closed Position.Valve Motor Breaker Manually Tripped & Valve Declared Inoperable.Caused by Failure of Brake Coil ML20041C3881982-02-17017 February 1982 LER 82-003/03L-0:on 820126,overload Alarm Condition Received While Closing Valve RHR-MO-26B,caused by Motor Brake Coil Failing to Release.New Motor & Brake Installed & Tested Satisfactorily ML20041C3741982-02-17017 February 1982 LER 82-002/03L-0:on 820121,during Routine Surveillance Testing NBI-LIS-101A Found to Trip at Lower than Tech Spec Limits.Caused by Barton Model 288 Switch Actuating at Random Positions.Switch Replaced ML20041C3871982-02-17017 February 1982 LER 82-001/03L-0:on 820122,reactor Vessel Level Switch NBI-LIS-72C Failed to Trip at Tech Spec Setpoint.Caused by Misalignment of Switch Mechanism.New Switch Calibr & Installed ML20040D3491982-01-20020 January 1982 LER 81-026/03L-0:on 811223,switches NBI-LIS-01A & NBI-LIS- 101B Found Set at Level Lower That Tech Spec Limits.Caused by Setpoint Drift.Switches Returned to Correct Setpoints. Instrument Drift to Be Closely Monitored ML20040D9261982-01-0505 January 1982 LER 81-025/04T-0:on 811224,during Full Power,Discharge Was Made from Floor Drain Sample Tank W/O Adequate Sampling & Analysis of Batch.Caused by Personnel Error.Liquid Discharge Procedures Being Revised.Personnel Reprimanded ML20038C5321981-12-0303 December 1981 LER 81-024/03L-0:on 811106,safety Relief Valve 71-D Failed to Close After Test.Caused by Failure of Solenoid Plunger to Drop Out When Solenoid de-energized.Solenoid Replaced ML20010G0961981-08-25025 August 1981 LER 81-020/03L-0: on 810728, During Procedure Returning Diesel Generator 1 to Svc After Flexible Fuel Line Leak, Control Air Line Fitting Failed Causing Generator to Shut Down. Caused by Broken Air Line Due to Crimped Ferrule ML20010F9881981-08-25025 August 1981 LER 81-019/03L-0:on 810728,during Surveillance to Prove Operability of Diesel Generator 1,fuel Supply Hose Developed Leak.Caused by Excessive Localized Flexure & Vibration. Hose Replaced ML20010G2661981-08-25025 August 1981 LER 81-021/03L-0:on 810728,during Performance of Surveillance Procedure on Diesel Generator 2,injection Line Failed.Caused by Metal Fatigue & Vibration.Component Replaced ML20010A1391981-07-22022 July 1981 LER 81-018/03L-0:on 810625,pressure Switch NBI-PS-52A Found W/Trip Point Less Conservative than Tech Spec.Apparently Caused by Setpoint Drift.Switch Readjusted.Setpoints for Switches Reset ML20010A1671981-07-13013 July 1981 LER 81-017/03L-0:on 810613,reactor Core Isolation Cooling Sys Steam Supply Valve RCIC-MOV-M016 Failed to Open.Caused by Improperly Wired Motor Operator Circuit.Jumper Installed ML20010A5391981-07-0909 July 1981 LER 81-016/03L-0:on 810610,core Thermal Power Calculation Performed by Process Computer Found Incorrect Due to Incorrect Feedwater Flow Value in Computer.Caused by Personnel Error in Changing Conversion Coefficient 1994-05-13
[Table view] Category:TEXT-SAFETY REPORT
MONTHYEARML20212K9781999-09-30030 September 1999 Safety Evaluation Accepting USI A-46 Implementation Program ML20217A9931999-09-30030 September 1999 NRC Regulatory Assessment & Oversight Pilot Program, Performance Indicator Data ML20217G7461999-09-30030 September 1999 Monthly Operating Rept for Sept 1999 for Cooper Nuclear Station 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 ML20212C5001999-08-31031 August 1999 Monthly Operating Rept for Aug 1999 for Cooper Nuclear Station ML20211D6491999-08-25025 August 1999 Part 21 Rept Re Nonconformance within LCR-25 safety-related Lead Acid Battery Cells Manufactured by C&D.Analysis of Cells Completed.Analysis of Positive Grid Matl Shows Nonconforming Levels of Calcium within Positive Grid Alloy ML20210R0381999-07-31031 July 1999 Monthly Operating Rept for July 1999 for Cooper Nuclear Station ML20210J2921999-07-29029 July 1999 Special Rept:On 990406,OG TS & Associated Charcoal Absorbers Were Removed from Svc.Caused by Scheduled Maint on Hpci. Evaluation of Offsite Effluent Release Dose Effects Was Performed to Ensure Plant Remained in Compliance ML20209H8281999-07-15015 July 1999 Safety Evaluation Accepting GL 95-07, Pressure Locking & Thermal Binding of Safety-Related Power-Operated Gate Valves, for Cooper Nuclear Station ML20211A9981999-07-12012 July 1999 Draft,Probabilistic Safety Assessment, Risk Info Matrix, Risk Ranking of Systems by Importance Measure ML20196H8621999-06-30030 June 1999 NRC Regulatory Assessment & Oversight Pilot Program, Performance Indicator Data, June 1999 Rept ML20209E1061999-06-30030 June 1999 Monthly Operating Rept for June 1999 for Cns.With ML20196B3851999-06-17017 June 1999 Summary Rept of Facility Changes,Test & Experiments,Per 10CFR50.59 for Period 970901-990331.Summary of Commitment Changes Made During Same Time Period Also Encl ML20195K2851999-05-31031 May 1999 Monthly Operating Rept for May 1999 for Cooper Nuclear Station.With ML20206P0481999-05-12012 May 1999 Safety Evaluation Concluding That NPP Established Acceptable Program to Verify Periodically design-basis Capability of safety-related MOVs at CNS & Adequately Addressed Actions Requested in GL 96-05 ML20206J0811999-05-0404 May 1999 Rev 14 to CNS QA Program for Operation ML20206P9751999-04-30030 April 1999 Monthly Operating Rept for Apr 1999 for Cooper Nuclear Station ML20205Q0891999-03-31031 March 1999 Monthly Operating Rept for Mar 1999 for Cooper Nuclear Station.With ML20204G8951999-03-15015 March 1999 CNS Inservice Insp Summary Rept Fall 1998 Refueling Outage (RFO-18) ML20207M9231999-03-12012 March 1999 Amended Part 21 Rept Re Cooper-Bessemer Ksv EDG Power Piston Failure.Total of 198 or More Pistons Have Been Measured at Seven Different Sites.All Potentially Defective Pistons Have Been Removed from Svc Based on Encl Results ML20204B3701999-03-11011 March 1999 SER Accepting Third 10-year Interval Inservice Insp Plan Requests for Relief for RI-17,Rev 1 and RI-25,Rev 0.Request for Relief RI-13,Rev 2 Involving Snubber Testing & Is Being Evaluated in Separate Report ML20204C9751999-02-28028 February 1999 Monthly Operating Rept for Feb 1999 for Cooper Nuclear Station ML20199E6751999-01-14014 January 1999 Monthly Operating Rept for Dec 1998 for Cooper Nuclear Station ML20195B9191998-12-31031 December 1998 1998 NPPD Annual Rept. with ML20196J9641998-12-0707 December 1998 Safety Evaluation Accepting Licensee Third 10-yr Interval Inservice Insp Plan Request for Relief RI-27,rev 1 ML20198D2471998-11-30030 November 1998 Monthly Operating Rept for Nov 1998 for Cooper Nuclear Station.With ML20196A2861998-11-23023 November 1998 SER Re Core Spray Piping Weld for Cooper Nuclear Station. Staff Concluded That Operation During Cycle 19 Acceptable with Indication re-examined During RFO 18 ML20196A5241998-11-23023 November 1998 Safety Evaluation Accepting Proposed Alternative to Use UT Techniques Qualified to Objectives of App Viil as Implemented by PDI Program in Performing RPV Shell Weld & Shell to Flange Weld Examinations ML20196A5061998-11-23023 November 1998 Safety Evaluation Re Flaw Indication Found in Main Steam Nozzle to Shell Weld NVE-BD-N3A at Cns.Plant Can Be Safely Operated for at Least One Fuel Cycle with Indication in as-is Condition ML20196C4241998-11-20020 November 1998 Rev 1 to Cooper Nuclear Station COLR Cycle 19 ML20195H1761998-11-17017 November 1998 SER Authorizing Proposed Alternative in Relief Requests RV-06,RV-07,RV-09,RV-11,RV-12 & RV-15 Pursuant to 10CFR50.55a(a)(3)(ii).RV-08 Granted Pursuant to 10CFR50.55a(f)(6)(i) & RV-13 Acceptable Under OM-10 ML20195F8601998-10-31031 October 1998 Monthly Operating Rept for Oct 1998 for Cooper Nuclear Station.With ML20155D9961998-10-31031 October 1998 Rev 0 to GE-NE-B13-01980-24, Fracture Mechanics Evaluation on Observed Indication at N3A Steam Outlet Nozzle to Shell Weld at Cooper Nuclear Station ML20154Q5661998-10-0505 October 1998 Rev 0 to CNS COLR Cycle 19 ML20154L5381998-09-30030 September 1998 Monthly Operating Rept for Sept 1998 for Cooper Nuclear Station.With ML20151Z6141998-09-16016 September 1998 SER Accepting Util Responses to NRC Bulletin 95-002 for Cooper Nuclear Station ML20154F7931998-08-31031 August 1998 Rev 0 to J11-03354-10, Supplemental Reload Licensing Rept for CNS Reload 18,Cycle 19 ML20153B1101998-08-31031 August 1998 Monthly Operating Rept for Aug 1998 for Cooper Nuclear Station ML20237E7771998-08-20020 August 1998 Revised COLR Cycle 18 for Cooper Nuclear Station ML20151Q1211998-08-14014 August 1998 Rev 0 to Control of Hazard Barriers ML20237C0591998-07-31031 July 1998 Monthly Operating Rept for Jul 1998 for Cooper Nuclear Station ML20236R9131998-07-20020 July 1998 SER Accepting Rev 13 to Quality Assurance Program for Operation Policy Document for Plant ML20236P2971998-07-0707 July 1998 Rev 2 to NPPD CNS Strategy for Achieving Engineering Excellence ML20236R0931998-06-30030 June 1998 Monthly Operating Rept for June 1998 for Cooper Nuclear Station ML20249A7701998-05-31031 May 1998 Monthly Operating Rept for May 1998 for Cooper Nuclear Station ML20247G6131998-05-13013 May 1998 Part 21 Rept Re Defect Contained in Automatic Switch Co, Solenoid Valves,Purchased Under Purchase Order (Po) 970161. Caused by Presence of Brass Strands.Replaced Defective Valves ML20247G0951998-04-30030 April 1998 Monthly Operating Rept for Apr 1998 for Cooper Nuclear Station ML20237B6861998-04-24024 April 1998 Vols I & II to CNS 1998 Biennial Emergency Exercise Scenario, Scheduled for 980609 ML20217A1531998-04-16016 April 1998 Closure to Interim Part 21 Rept Submitted to NRC on 970929. New Date Established for Completion of Level I & 2 Setpoint Project Committed to in .Final Approval of Setpoint Calculations Will Be Completed by 980531 ML20216G5331998-03-31031 March 1998 Monthly Operating Rept for Mar 1998 for Cooper Nuclear Station 1999-09-30
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CNSS892321-W., -December 26, 1989--
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Dear = Sir:
Cooper-Nuclear Station' Licensee Event Report'89-026. Kevision 0,'is_being ,
- c. forwarded as an' attachment to this letter. -!
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.t Sincerely, ,
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~
h G. R ' Horn "
Division Manager of-Nuclear Operations Cooper Nuclear Station n
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'V. L. Wolstenholm~ -!
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'INPO Records Center ANI Library NRC Resident Inspector J- R. J. Singer CNS' Training CNS Quality Assurance !
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LK;ENSEE EVENT REPORT (LER) E'IMMi#i A"OTRD ,o'fU AND REPORTS MANAGEMENT BRANCH (P430), U S. NUCLE AR REGULATORY COMMIS$10N, WASHINGTON. DC 20666 AND TO THE PAPERWORK Rf DUt' TION PROJECT (31504104). OF F ICE OF M ANAOf MENT AND BUDGET,WA$HINGTON, DC 20603
. ; FACILITY esanat 0) DOCast seveABER (21 PAGE m Cooper' Nuclear Station ol5l0lolc1219l8 1lOFl016
"' Reactor > Scram Due to Main Stear Isolation Valve Closure as a Result of Low Instrument Air Pressure Caused by an Air Dryer Malfunction EVEstT DATI (6) Ltn NyaABtR tel REPORT DAff (7) OTHER F ACILITlf 8 INVOLVED 65) - ,
MONTH DAY YEAR YEAR %OM n 'EN MONTH DAY YgAR
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AneTRACT as.,,, R, oa Na.u , mam,,.wr o.n .,ne.Nm rw. ant an.,1 oei 1 On November 25, 1989, at 10:15 P.M., with the plant at full power, a reactor scram occurred when the outbeard Main Steam Isolation Valves (MSIVs) closed as I
- a. result of depressurization of the Instrument Air (IA) System. The dscrease h l in IA System pressure occurrcd when the "B" Air Dryer Post Filter assembly I ruptured. Investin tien revealed that the Post Filtet media (paper cartridges) had been ignited by either hot air or hot particles from the ;
dryer. The burning cartridges resulted in overheating of the filter assembly j housing.-'The associated heat induced stress, coupled with internal (system) l air pressure, caused the housing to deform and rupture. l Corrective actions taken included complete disassembly, inspection and ;
refurbishment of the "B" Air Dryer, including replacement of the Post Filter assembly, as well as an extensive inspection of the "A" Air Dryer. Filter I cartridges capable of withstanding high temperature conditions were installed !
in both Post Filter assemblies. Approximately fifteen feet of piping downsteam of the Post Filter was replaced due to concerns about the possible effects of overheating. Checks were made of the IA System downstream of the
. Post Filters to verify system cleanliness. Additionally, components in the vicinity of the ruptured Post Filter asseml@ were inspected to ensure that debris from the event was not present.
Further corrective action includes upgrading the Air Dryer training programs, perfor, nance of a design review of the Air Dryer trains, and implementation of upgraded Air Dryer operational checks, and preventive maintenance activities.
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.4. PAPERWO K RE U T e J A ,' I OF MANAGEME NT AND OUD LYT. W ASHINGTON,0C 20603.
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'A2 : EVENT DESCRIPTION j
~t On November 25, 1989, at 10:15 P.M., with the plant in routine. j operation at_ full-power, a reactor scram occurred when the outboard l Main Steam Isolation Valves-(MSIVs) closed as.a result of l
'depressurization of the Instrument Air (IA) System. Just prior to '
.)
N the event, Control Room Operators heard a muff]cd rise. This was j immediately followed-by several Loss of Air Pressu~e alarms. IA and "
Service Air (SA) pressures were checked and determ ued to be about
~ 40 psig and decreasing. Normnl pressure ranges from 100 to 105 psig. The.b" pass around the air dryers (SA-MOV-81MV) was immediately opened in an effort to restore system pressure._ 1 IA-MOV-80MV was noted to be automatically closing to isolate 6 non-critical air system demands. Shortly thereafter,.the Control j
- Rod Drift alarm on Control Room Panel 9-5 annunciated. However, before the reactor could be manually scrammed, the automatic scram due to MSIV closure occurred. The tine interval!between receipt of the Control Rod Drift alarm and Reactor'Frotection System (RPS) !
actuation was approximately six seconds. .
Subsequent to tle scram, the ensuing water 3avel transient resulted_
in initiation of. Groups 2,.3, and 6 Isolations (Reactor Coolant;
-Reactor Water Clean-up; and Secondary Containment, including ;
actuation ~of the Standby Gas Treatment System). Additionally both '
i
, the High Pressure Coolant Injection (HPCI) and Reactor Core Isolation Cooling (RCIC) Systems automatically initiated as a result of the water level transient and functioned to restore and maintain !
l !
Reactor water level.
As_ indicated above, the reduction in-IA System pressure resulted in -!
closure of the outboard'MSIVs. It should'be noted that during normal plant operation,.the inboard MSIV pneumatic supply is N f*
- the Nitrogen Inerting Systec.; consequently, the inboard MSIVs,2 as ,
well as the remainder of the components inside the Drywell being supplied with N , were unaffected by the TA System depressurization.
Themostimmedikteeffect,however,oftheIASystem depressurizacion was associated with the Control Rod Drive (CRD) i System Scram Air Header. As IA System pressure decreased, Scram Air Header pressure also began to decrease. As a result, CRD insertion ,
(annunciated in the Control Room by the Control Rod Drift alarm) began due to the individual CRD Scram Pilot Valves and Scram Valves repositioning to their open (fail safe) position. Prior to y actuation of the RPS due to'the MSIVs not being fully open (with the Reactor Mode switch in RUN), 125 of the 137 contral rods were partially or fully inserted in the core. As a result, at the time of RPS actuation, power level had been reduced from 100 percent to less than 10 percent.
NRC Penn 30BA (6 89) '
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Ponts 300A . U.S. NUCLE A4 s E1ULATORY COMMITS 608s APP;;OVED Out NO.31504104
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~Upon rupture of the "B" Air Dryer Post Filter assembly, the high flow rate of air through the drying chamber in service resulted in
. excessive differential pressure across the Air uryer chamber outlet strainer.- The strainer collapsed, allowing a small amount of ,
!' desiccant to be transported out of the chamber, through the ruptured 1 Post Filter assembly and into the Control Building basement area.
4 At.10:37:P.M.,-the "B" Air Dryer was isolated and IA System pressure p restored'to-normal. Subsequently, normal scram recovery procedures
-were implemented.
B. PLANT STATUS 0
Prior to rupture of the "B" Air Dryer Post Filter assembly, the plant was operating at approximately 100 percent power (800 MWe).
At the' time of RPS actuation, power had been reduced to less than ten;(10) percent due to Control Rod insertion as a result of-low IA System (and Scram Air Header) pressure. I C. BASIS FOR REPORT An. unplanned RPS actuation, reportable in accordance with E
10 CFR 50.73(a)(2)(iv).
D. CAUSE i Each of the Air Dryers (A and B trains) has two chambers (towers) which contain an alumina oxide desiccant mat $ rial. While one ,
chamber is on line, the other chamber is being regenerated by reversing the purge air flow and heating the deciccant with an l~ electric heater-(Pall Trinity Drawing 6AC2024-ED1). A timer controls the switching action between the two chambers of the dryer.
'A regeneration cycle is three (3) hours of heating and one (1) hour of cooling. The heating of the desiccant is controlled by.
temperature switch 2TS (Pall Trinity Drawing C3024-46T), which is designed to open at 650*F. This temperature switch failed to control the electric heater during the regeneration cycle. As a result,'when the timer shifted the two air dryer chambers and placed g this chamber on line, hot air (and possibly some hot desiccant particles) flowed into the Air Dryer Post Filter and resulted in ignition of the paper filter elements in the Post Filter assembly.
The Post Filter assembly heated and ruptured under system pressure.
Contributing to the failure of the Post Filter assembly was the use of low temperature filter elements made of paper (ignition temperature of 451'F). At the time that the Air Dryers and Post Filter assemblies were installed, the vendor design specified these filter elements. The current design uses high temperature filter l
elements which are not susceptible to ignition.
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, None. .-During normal plant operation, the pneumatically operated
'devicca inside the primary containment (ADS, Low-Low Set, inboard MSIVs and-associated accumulators, etc.)_are suppled with N,3 from the Nitrogen Inerting System that was unaffected by the event.
Therefore, operability of these components was not affected by the Ldegraded IA System pressure, It should be noted also, that d.ese devices have Class I accumulators and check valves, and are
- periodically leak tested to ensure operability upon loss- of N '
2 The IA supplied air-operated devices outside of primary containment that perform isolation functions are provided with seismic Class 1 accumulators and check valves. .These components are periodically leak tested to verify their capability to perform their intended function-following loss of IA. During this event, these valves functioned as designed. Finally, the MSIVs have a " fail-safe" design in that they will close in the event of. loss of IA. The outboard MSIV's performed as intended during this event.
F. SAFETY IMPLICATIONS None. During normal plant operation, upon loss of IA, the outboard MSIVs will c1cse. As noted in the USAR.in Chapter XIV, Section 5.0, the analytical results of a MSIV closure event, considered to be an
- l. abnormal operational transient, are based upon the plant being in ;
t! operation at 105 percent of rated power. This event, then,
- l. constituted the most limiting transient which, as previously noted
'in Section E. resulted in no safety concerns.
l G. CORRECTIVE ACTION
'As noted in Section A, Event Description, HPCI and RCIC l automatically actuated to restore Reactor Vessel Water level and the "B" Air Dryer was isolated providing for restoration of the IA and L
SA Systems to normal. Subsequently, normal scram recovery actions were initiated.
With regard to the "B" Air Dryer and Post Filter assembly, a detailed systematic investigation of Air Dryer operation was completed. As a result of this effort, the "B" Air Dryer was completely refurbished. Elements of the investigation and refurbishment effort included:
- 1. All associated instrumentation and controls were either replaced or recalibrated, and verified to be operating correctly.
- 2. The electric heaters and the deaiccant in both chambers of the "B" Air Dryer were replaced.
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- 3. 'A replacement Post Filter assembly was procured and installed. '
The replacement unit is functionally equivalent to the originally installed unit that failed, but differs in overall r dimensions and inlet and outlet configuration. As a result, .
piping configuration changes were implemented as required.
- 4. Filter cartridges resistant to high temperature gases were procured and installed. Pre-service testing included verification that the new post filter media does not burn (tested to.1200'F).
- 5. The p-efilter media was inspected and replaced with the normal
- 6. ' Fifteen feet of piping downstream of the "B" Air Dryer Post Filter assembly was replaced due to concerne regardirg the potential effects of its being overheated, s
Following this effort, a detailed post mainte.ance test was performed to verify proper operations of the "B" Air Dryer.
An inspection and refurbishment effort of the "A" Air Dryer was also conducted.- A leaking check valve was replaced; following verification of correct setpoints, replacement thermal switches for the heaters were installed; and the heaters were tested, resulting in one being repinced. The dryer outlet strainers were inspected and cleaned. The control timer was also verified to be operating-correctly. The Post Filter media was replaced with new high temperature media, and the pre-filter media was replaced. Post maintenance testieg was performed to verify correct operating sequence. Further inspection of the "A" Air Dryer is planned during the 1990 Refueling Outage.
1 l The rupture of the "B" Ait Dryer Post Filter discharged filter i debris and a small amount of desiccant from the in-service chamber -
into the Control Building basement. The motors of pumps and the air compressors located in the basement, as well as Motor Control Center o cabinets MCC-L, T, and X, were inspected to ensure they were clean L and free of any material discharged by the ruptura. Additionally, l the intake air filters of the three Station Air Compressors were l' cleaned. To ensure that desiccant and/or other debris from the in-service chamber was not carried downstream into the IA System, in-line filters installed close to components supplied with IA were inspected. No contaminants were found. Additionally, the air lines l were blown down at varicus selected locations. No evidence that i desiccant or debris had migrated downstream from the Air Dryer or Post Filter assembly from this event was found.
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G.. CORRECTIVE ACTION (Contf.nued) ]
Corrective actions currently underway or being planned include the following:' ;
- 1. A revision-is being made to Operator logs to provide for more closely monitoring dryer. chamber bed temperatures. Normal operating parameter limits have been specified.
- 2. Appropriate training programs regarding Air Dryer operation will be reviewed and upgraded.- ;
- 3. The existing design of the dryer trains will be re-evaluated.
- 4. Preventative Maintenance requirements and routine operational. :
checks will be reassessed, based upon vendor manual. +
requirements and industry experience. Upgrades to existing program requirements will be implemented, as appropriate.
H. SIMILAR EVENTS None.
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