05000334/LER-1979-034-03, /03L-0:on 790424,loop B Temp Indication Failed Downscale.Caused by Failure of Capacitor in Low Level Amplifier TM-RC-422H for Loop B Hot Leg Temp.Redundant Instrumentation Used Until Capacitor Replaced

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/03L-0:on 790424,loop B Temp Indication Failed Downscale.Caused by Failure of Capacitor in Low Level Amplifier TM-RC-422H for Loop B Hot Leg Temp.Redundant Instrumentation Used Until Capacitor Replaced
Person / Time
ML19249D826
Site:	Beaver Valley
Issue date:	09/18/1979
From:	Werling J DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19249D821	List: 05000334/LER-1979-034, Forwards LER 79-034/03L-0 05000334/LER-1979-034-03, /03L-0:on 790424,loop B Temp Indication Failed Downscale.Caused by Failure of Capacitor in Low Level Amplifier TM-RC-422H for Loop B Hot Leg Temp.Redundant Instrumentation Used Until Capacitor Replaced
References
LER-79-034-03L, LER-79-34-3L, NUDOCS 7909250444
Download: ML19249D826 (1)
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LER-1979-034, /03L-0:on 790424,loop B Temp Indication Failed Downscale.Caused by Failure of Capacitor in Low Level Amplifier TM-RC-422H for Loop B Hot Leg Temp.Redundant Instrumentation Used Until Capacitor Replaced

Event date:
Report date:
3341979034R03 - NRC Website
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text

Licensee Event Report

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		Reporting criterion
05000334/LER-1979-001-04, /04T-0 on 790104:chlorination Performed in River Water Sys & Condenser Section.High Alarm on Chlorine Analyzer Received Twice;Chlorine Reached Max of 2.0 Ppm. Caused by Reversed Flow Through Condenser	/04T-0 on 790104:chlorination Performed in River Water Sys & Condenser Section.High Alarm on Chlorine Analyzer Received Twice;Chlorine Reached Max of 2.0 Ppm. Caused by Reversed Flow Through Condenser
05000334/LER-1979-001, LER 79-1/04P on 790105:during Plant Shutdown,All 4 Cooling Tower Pumps Were Secured,Reversing Flow Thru Main Condenser, Resulting in Direct Backwash of Chlorine Additions Into the River.Addl Info & Corrective Action to Follow	LER 79-1/04P on 790105:during Plant Shutdown,All 4 Cooling Tower Pumps Were Secured,Reversing Flow Thru Main Condenser, Resulting in Direct Backwash of Chlorine Additions Into the River.Addl Info & Corrective Action to Follow
05000334/LER-1979-002-03, /03L-0 on 790103:reactor Trip & Safety Injection Occurred.During recovery,1C Charging Pump Had Low Discharge Pressure Due to Faulty Rotating Element in Pump	/03L-0 on 790103:reactor Trip & Safety Injection Occurred.During recovery,1C Charging Pump Had Low Discharge Pressure Due to Faulty Rotating Element in Pump
05000334/LER-1979-002, Forwards LER 79-002/03L-0 & 79-003/03L-0	Forwards LER 79-002/03L-0 & 79-003/03L-0
05000334/LER-1979-003-03, /03L-0 on 790102:increasing Containment Air Partial Pressure observed.1B Containment Vacuum Pump Motor Running,But Pump Not Turning Due to Seized Rotor on Pump	/03L-0 on 790102:increasing Containment Air Partial Pressure observed.1B Containment Vacuum Pump Motor Running,But Pump Not Turning Due to Seized Rotor on Pump
05000334/LER-1979-005-99, /99X-0 on 790118:during Load Reduction,Condenser Steam Dump Control Valves Opened,Resulting in High Steam Flow Condition Causing Reactor Trip & Safety Injection. Caused by Valve Operator Exposure to Cold Temp	/99X-0 on 790118:during Load Reduction,Condenser Steam Dump Control Valves Opened,Resulting in High Steam Flow Condition Causing Reactor Trip & Safety Injection. Caused by Valve Operator Exposure to Cold Temp
05000334/LER-1979-005, Forwards LER 79-005/99X-0	Forwards LER 79-005/99X-0
05000334/LER-1979-006-03, /03L-0 on 790120:vital Bus Inverter 3 Failed Resulting in Loss of Voltage on Bus.Caused Reactor to Trip on False Indication of 1C Reactor Coolant Pump Breaker Opening.Failure Caused by Faulty Components in Inverter	/03L-0 on 790120:vital Bus Inverter 3 Failed Resulting in Loss of Voltage on Bus.Caused Reactor to Trip on False Indication of 1C Reactor Coolant Pump Breaker Opening.Failure Caused by Faulty Components in Inverter
05000334/LER-1979-006, Forwards LER 79-006/03L-0	Forwards LER 79-006/03L-0
05000334/LER-1979-007-01, /01T-0 on 790305:steam Driver Auxiliary Feedwater Pump Declared Inoperable Because 1B Steam Supply Trip Valve Would Not Close.Caused by Missing Nut & Washer on 1C Steam Generator Supply Check Valve.Nut & Washer Replaced	/01T-0 on 790305:steam Driver Auxiliary Feedwater Pump Declared Inoperable Because 1B Steam Supply Trip Valve Would Not Close.Caused by Missing Nut & Washer on 1C Steam Generator Supply Check Valve.Nut & Washer Replaced
05000334/LER-1979-007, Forwards LER 79-007/01T-0	Forwards LER 79-007/01T-0
05000334/LER-1979-008-01, /01T-1 on 790329:notifies of Potential Inconsistency of Single Dropped Control Rod.Caused by Incorrect Measurement of Core Average Power Level by Rod Controller During Rod Drop Events	/01T-1 on 790329:notifies of Potential Inconsistency of Single Dropped Control Rod.Caused by Incorrect Measurement of Core Average Power Level by Rod Controller During Rod Drop Events
05000334/LER-1979-009-03, /03L-0 on 790320:during Surveillance Test,Diesel Generator 1 Output Breaker Failed to Close Upon Actuation of Control Switch.Cause of Inoperable Breaker Unknown.Operators Reinstructed in Test Circuit & Surveillance Increased	/03L-0 on 790320:during Surveillance Test,Diesel Generator 1 Output Breaker Failed to Close Upon Actuation of Control Switch.Cause of Inoperable Breaker Unknown.Operators Reinstructed in Test Circuit & Surveillance Increased
05000334/LER-1979-010-01, /01T-1 on 790416:notifies of Potential for Failure of Inside Recirculation Spray Pump Motors.Caused by Reduction of Internal Clearance Due to Heat Gradient as Motor Comes Up to Operating Temp.Mods Made to Clearance	/01T-1 on 790416:notifies of Potential for Failure of Inside Recirculation Spray Pump Motors.Caused by Reduction of Internal Clearance Due to Heat Gradient as Motor Comes Up to Operating Temp.Mods Made to Clearance
05000334/LER-1979-013-03, /03L-0 on 790522:during Surveillance of Control Room Habitability Sys,Pressure Regulators for Control Room Pressurization Were Found Cycling.Caused by Improper Calibr. Controls Tuned & Procedure Revised	/03L-0 on 790522:during Surveillance of Control Room Habitability Sys,Pressure Regulators for Control Room Pressurization Were Found Cycling.Caused by Improper Calibr. Controls Tuned & Procedure Revised
05000334/LER-1979-014-01, /01T-1 on 790618:during Special Radiographic Insp of Feedwater Inlet Piping Welds,Cracking Was Discovered in Inlet Elbows.Caused by Fatigue Failure Along W/Corrosion. Insp Completed & Welds Repaired	/01T-1 on 790618:during Special Radiographic Insp of Feedwater Inlet Piping Welds,Cracking Was Discovered in Inlet Elbows.Caused by Fatigue Failure Along W/Corrosion. Insp Completed & Welds Repaired
05000334/LER-1979-014, Submits Supplemental Info to LER 79-014/01T-0 Re Identification of Cracks in Feedwater Line Elbows.Response Fulfills Requirements of IE Bulletin 79-13.Tables Attached	Submits Supplemental Info to LER 79-014/01T-0 Re Identification of Cracks in Feedwater Line Elbows.Response Fulfills Requirements of IE Bulletin 79-13.Tables Attached
05000334/LER-1979-015-01, /01T-0 on 790621:received Vendor Notification That High Energy Break Inside Containment Could Cause Potential Steam Generator Level Bias Leading to Delayed Protection Signals.Caused by Calculation Error	/01T-0 on 790621:received Vendor Notification That High Energy Break Inside Containment Could Cause Potential Steam Generator Level Bias Leading to Delayed Protection Signals.Caused by Calculation Error
05000334/LER-1979-016, Forwards LER 79-016/03L-1	Forwards LER 79-016/03L-1
05000334/LER-1979-016-03, /03L-1 on 790608:discovered Cables on Pump Header Isolation Valves Incorrectly Routed Through Cable Trays. Caused by Failure of Const Personnel to Install & Verify Cable Routings Per Procedure.Routing Corrected	/03L-1 on 790608:discovered Cables on Pump Header Isolation Valves Incorrectly Routed Through Cable Trays. Caused by Failure of Const Personnel to Install & Verify Cable Routings Per Procedure.Routing Corrected
05000334/LER-1979-017-03, /03L-0 on 790609:during insp,1B Lhsi Pump Suction Valve from Refueling Water Storage Tank Found Inoperable. Caused by Failure of Motor Operator Torque Switch.Switch Assembly Replaced,Tested & Returned to Svc	/03L-0 on 790609:during insp,1B Lhsi Pump Suction Valve from Refueling Water Storage Tank Found Inoperable. Caused by Failure of Motor Operator Torque Switch.Switch Assembly Replaced,Tested & Returned to Svc
05000334/LER-1979-018, Forwards LER 79-018/03L-0	Forwards LER 79-018/03L-0
05000334/LER-1979-018-03, /03L-0 on 790703:while Switching Vital Bus 3 to Alternate Source Containment Isolation,Phase B Actuation Occurred.Caused by Hi-Hi Containment Pressure.Revised Procedure for Transferring Vital Bus	/03L-0 on 790703:while Switching Vital Bus 3 to Alternate Source Containment Isolation,Phase B Actuation Occurred.Caused by Hi-Hi Containment Pressure.Revised Procedure for Transferring Vital Bus
05000334/LER-1979-019, Forwards LER 79-019/01T-0	Forwards LER 79-019/01T-0
05000334/LER-1979-019-01, /01T-0 on 790723:two of Four Vendors of Wire Used in Safety Injection Sys Cannot Document Quality of Wire for post-DBA Containment Environ.Wire Will Be Replaced on Four Valves During Refueling	/01T-0 on 790723:two of Four Vendors of Wire Used in Safety Injection Sys Cannot Document Quality of Wire for post-DBA Containment Environ.Wire Will Be Replaced on Four Valves During Refueling
05000334/LER-1979-020, Forwards LER 79-020/01T-0	Forwards LER 79-020/01T-0
05000334/LER-1979-020-01, /01T-0 on 790724:during Insp,Inoperable Pipe Hanger Baseplate Observed.Caused by Improper Installation of Concrete Expansion Anchors in Baseplate Due to Lack of Formal Procedures During Initial Installation	/01T-0 on 790724:during Insp,Inoperable Pipe Hanger Baseplate Observed.Caused by Improper Installation of Concrete Expansion Anchors in Baseplate Due to Lack of Formal Procedures During Initial Installation
05000334/LER-1979-021, Notifies of LER 79-21/01P:during Testing of Emergency Bus Volt Transformers,Readings Indicated Degradation of Insulation Resistance as Compared to Original Acceptance Testing.Transformers Will Be Required	Notifies of LER 79-21/01P:during Testing of Emergency Bus Volt Transformers,Readings Indicated Degradation of Insulation Resistance as Compared to Original Acceptance Testing.Transformers Will Be Required
05000334/LER-1979-021-01, /01T on 790726:meggar Readings Indicated Degradation of Insulation Resistance During Testing of Emergency Bus GE Transformers.Cause Not Stated. Transformers Replaced W/Qualified Ite Transformers	/01T on 790726:meggar Readings Indicated Degradation of Insulation Resistance During Testing of Emergency Bus GE Transformers.Cause Not Stated. Transformers Replaced W/Qualified Ite Transformers
05000334/LER-1979-022, Forwards LER 79-022/03L-0	Forwards LER 79-022/03L-0
05000334/LER-1979-022-03, /03L-0 on 790722:three of Four Wires Loose & Pulled Out of Main Power Connector on Containment Hydrogen Recombiner 1A While Disassembling for Insp.Caused by Insufficient Set Screw Torque on Wires in Pins of Connector	/03L-0 on 790722:three of Four Wires Loose & Pulled Out of Main Power Connector on Containment Hydrogen Recombiner 1A While Disassembling for Insp.Caused by Insufficient Set Screw Torque on Wires in Pins of Connector
05000334/LER-1979-023-03, Diesel Generator Output Breaker 1 Failed to Close When Control Switch Actuated & Alarm Indicated Air Start Motor 1 Failure to Start Generator.Caused by Sticking Pinion.Pinion Assembly Cleaned	Diesel Generator Output Breaker 1 Failed to Close When Control Switch Actuated & Alarm Indicated Air Start Motor 1 Failure to Start Generator.Caused by Sticking Pinion.Pinion Assembly Cleaned
05000334/LER-1979-023, Forwards Updated LER 79-023/03X-1	Forwards Updated LER 79-023/03X-1
05000334/LER-1979-024-01, /01T-0 on 790727:as Result of Review of Asco Solenoid Valves Per IE Bulletin 79-01A,44 Valves Found W/Deficiencies in Environ Qualifications.Caused by Inadequate Design	/01T-0 on 790727:as Result of Review of Asco Solenoid Valves Per IE Bulletin 79-01A,44 Valves Found W/Deficiencies in Environ Qualifications.Caused by Inadequate Design
05000334/LER-1979-025-03, /03L-0 on 790624:during Records Review,Biasing Circuit for Channel 2 Temp Change Signal Summator Produced Output Signal Setpoint Approx 25 Degrees Too Low. Caused by Failure of Instrument Loop Signal Summator	/03L-0 on 790624:during Records Review,Biasing Circuit for Channel 2 Temp Change Signal Summator Produced Output Signal Setpoint Approx 25 Degrees Too Low. Caused by Failure of Instrument Loop Signal Summator
05000334/LER-1979-026, Forwards LER 79-026/03L-0	Forwards LER 79-026/03L-0
05000334/LER-1979-026-03, /03L-0:on 790827,channel 3 Overpower Delta Temp Alarm Was Received.Caused by Miscalibr of Instrument Loop as Result of Not Having Current Resistance Temp Detector Calibr Data in Surveillance Test.Maint Procedures Will Be Rev	/03L-0:on 790827,channel 3 Overpower Delta Temp Alarm Was Received.Caused by Miscalibr of Instrument Loop as Result of Not Having Current Resistance Temp Detector Calibr Data in Surveillance Test.Maint Procedures Will Be Revised
05000334/LER-1979-028, Discusses LER 79-028/01P-0 on 790820:reactor Was Manually Tripped Following Trip of Main Feed Pump 1B Due to Low Net Positive Suction Head.Manual Trip Caused 1A & 1B 4kV Buses to Trip on All Reactor Coolant Pumps on Underfreque	Discusses LER 79-028/01P-0 on 790820:reactor Was Manually Tripped Following Trip of Main Feed Pump 1B Due to Low Net Positive Suction Head.Manual Trip Caused 1A & 1B 4kV Buses to Trip on All Reactor Coolant Pumps on Underfrequency
05000334/LER-1979-028-01, /01T-0:on 790819,while Performing Manual Actions Following Reactor Trip,Operator Tripped Generator Output Breakers,Resulting in Underfrequency.Caused by Operator Error.Operator Reprimanded	/01T-0:on 790819,while Performing Manual Actions Following Reactor Trip,Operator Tripped Generator Output Breakers,Resulting in Underfrequency.Caused by Operator Error.Operator Reprimanded
05000334/LER-1979-029, Forwards Updated LER 79-029/03L-0	Forwards Updated LER 79-029/03L-0
05000334/LER-1979-029-03, Speed Increaser Bearings & Lube Oil Pump Overheated.Caused by Failure of Personnel to Insure Satisfactory Return to Svc of Charging Pump Following Maint.Replaced Bearing & Lube Oil Pump	Speed Increaser Bearings & Lube Oil Pump Overheated.Caused by Failure of Personnel to Insure Satisfactory Return to Svc of Charging Pump Following Maint.Replaced Bearing & Lube Oil Pump
05000334/LER-1979-030-03, /03L-0:on 790823,containment Air Lock Surveillance Test Not Performed as Required.Caused by Failure of Operations Personnel to Perform Surveillance Test.Operating Supervisors Instructed to Be More Aware	/03L-0:on 790823,containment Air Lock Surveillance Test Not Performed as Required.Caused by Failure of Operations Personnel to Perform Surveillance Test.Operating Supervisors Instructed to Be More Aware
05000334/LER-1979-031-03, /03L-0:on 790807,during Testing of Emergency Diesel Generator Sequencing Circuit,First Loading Sequence Was Shorter than Required.Caused by Starting Point Being Off Zero.Sequencer Cycled & Adjusted to within Spec Limits	/03L-0:on 790807,during Testing of Emergency Diesel Generator Sequencing Circuit,First Loading Sequence Was Shorter than Required.Caused by Starting Point Being Off Zero.Sequencer Cycled & Adjusted to within Spec Limits
05000334/LER-1979-031, Forwards LER 79-031/03L-0	Forwards LER 79-031/03L-0
05000334/LER-1979-032-03, /03L-0:on 790809,prior to Energizing 480-volt Stub Bus from Newly Installed Transformer,One Load Breaker Did Not Trip on Bus Undervoltage.Caused by Dirty Contacts on Phase Imbalance Relay.Contacts Cleaned & Tested	/03L-0:on 790809,prior to Energizing 480-volt Stub Bus from Newly Installed Transformer,One Load Breaker Did Not Trip on Bus Undervoltage.Caused by Dirty Contacts on Phase Imbalance Relay.Contacts Cleaned & Tested
05000334/LER-1979-032, Forwards LER 79-032/03L-0	Forwards LER 79-032/03L-0
05000334/LER-1979-033-03, /03L-0:on 790824,nuclear Instrumentation Sys Power Range Low Power Trip Logic Inoperable.Caused by Faulty Logic Board for Low Power Trip.Logic Board Replaced & Surveillance Test Completed Satisfactorily	/03L-0:on 790824,nuclear Instrumentation Sys Power Range Low Power Trip Logic Inoperable.Caused by Faulty Logic Board for Low Power Trip.Logic Board Replaced & Surveillance Test Completed Satisfactorily
05000334/LER-1979-034, Forwards LER 79-034/03L-0	Forwards LER 79-034/03L-0
05000334/LER-1979-034-03, /03L-0:on 790424,loop B Temp Indication Failed Downscale.Caused by Failure of Capacitor in Low Level Amplifier TM-RC-422H for Loop B Hot Leg Temp.Redundant Instrumentation Used Until Capacitor Replaced	/03L-0:on 790424,loop B Temp Indication Failed Downscale.Caused by Failure of Capacitor in Low Level Amplifier TM-RC-422H for Loop B Hot Leg Temp.Redundant Instrumentation Used Until Capacitor Replaced
05000334/LER-1979-035-03, /03L-0:on 790430,during 18-month Surveillance testing,23 Snubbers Had lock-up or Bleed Rate Values Outside of Acceptance Criteria.Caused by Air in Cylinder,Wear Ring Problems & Handling Damage.Snubbers Rebuilt	/03L-0:on 790430,during 18-month Surveillance testing,23 Snubbers Had lock-up or Bleed Rate Values Outside of Acceptance Criteria.Caused by Air in Cylinder,Wear Ring Problems & Handling Damage.Snubbers Rebuilt
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