05000338/LER-1979-076-03, /03L-0 on 790530:quadrant Power Tilt Ratio in Upper Core in Excess of Tech Spec Limit.Cause Unknown. Possibly Due to Dropped Rod Cluster Control Assembly Rodlets

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/03L-0 on 790530:quadrant Power Tilt Ratio in Upper Core in Excess of Tech Spec Limit.Cause Unknown. Possibly Due to Dropped Rod Cluster Control Assembly Rodlets
Person / Time
ML19248C600
Site:	North Anna
Issue date:	06/29/1979
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19248C598	List: 05000338/LER-1979-076-03, /03L-0 on 790530:quadrant Power Tilt Ratio in Upper Core in Excess of Tech Spec Limit.Cause Unknown. Possibly Due to Dropped Rod Cluster Control Assembly Rodlets 05000338/LER-1979-078-03, /03L-0 on 790606:leak Detected in Casing Cooling Pump 1-RS-P-3A,making Casing Cooling Subsystem Inoperable. Caused by Unevenly Cast Facing Adjoining O Ring.Corrective Action: O Ring Cleaned & Overhauled ML19248C597
References
LER-79-076-03L, LER-79-76-3L, NUDOCS 7907030425
Download: ML19248C600 (2)
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LER-1979-076, /03L-0 on 790530:quadrant Power Tilt Ratio in Upper Core in Excess of Tech Spec Limit.Cause Unknown. Possibly Due to Dropped Rod Cluster Control Assembly Rodlets

Event date:
Report date:
3381979076R03 - NRC Website
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text

Licensee Event Report

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		Reporting criterion
05000338/LER-1979-001-01, /01T-0 on 790115:non-conservatism Identified in Calculations Performed in Monitoring Axial Power Distribution Fj(Z).Caused by Omission of Sys & Procedures Used to Monitor Fj(Z)	/01T-0 on 790115:non-conservatism Identified in Calculations Performed in Monitoring Axial Power Distribution Fj(Z).Caused by Omission of Sys & Procedures Used to Monitor Fj(Z)
05000338/LER-1979-001, Forwards LER 79-001/01T-0	Forwards LER 79-001/01T-0
05000338/LER-1979-002, Forwards LER 79-002/03L-0 & 79-003/03L-0	Forwards LER 79-002/03L-0 & 79-003/03L-0
05000338/LER-1979-002-03, /03L-0 on 790101:during Normal Operation,Pump 1-RM-P-159A Tripped on Overload.Containment Particulate Sample Flow Was Lost,Rendering Inoperable 1 Reactor Coolant Leak Detection Sys,Due to Deficient Federal 1206LLT Bearing	/03L-0 on 790101:during Normal Operation,Pump 1-RM-P-159A Tripped on Overload.Containment Particulate Sample Flow Was Lost,Rendering Inoperable 1 Reactor Coolant Leak Detection Sys,Due to Deficient Federal 1206LLT Bearing
05000338/LER-1979-003-03, /03L-0 on 790102:during Periodic Test,Noted That Containment Isolation Valve TV-SV-102-1 Would Not Shut Fully.Cause Undetermined	/03L-0 on 790102:during Periodic Test,Noted That Containment Isolation Valve TV-SV-102-1 Would Not Shut Fully.Cause Undetermined
05000338/LER-1979-004-03, /03L-0 on 790108:during 1-PT-36-1(A) Found That Steam Generator 3 Hi Hi Level Test Panel Was Faulty, Preventing Test of This Channel.Caused by Faulty Universal Logic Card on Test Panel	/03L-0 on 790108:during 1-PT-36-1(A) Found That Steam Generator 3 Hi Hi Level Test Panel Was Faulty, Preventing Test of This Channel.Caused by Faulty Universal Logic Card on Test Panel
05000338/LER-1979-005-01, /01T-0 on 790129:mufflers for Emergency Diesel Generators Not Seismically Supported Nor Missile Protected as Required by Fsar.Caused by Const Error	/01T-0 on 790129:mufflers for Emergency Diesel Generators Not Seismically Supported Nor Missile Protected as Required by Fsar.Caused by Const Error
05000338/LER-1979-005, Forwards LER 79-005/01T-0 & 79-008/01T-0	Forwards LER 79-005/01T-0 & 79-008/01T-0
05000338/LER-1979-006-03, /03L-0 on 790111:damaged Wiper Seal Found on Hydraulic Suppressor 1-FW-HSS-233.Caused by Poppet Valves Which Control Lock Up Rate Being Improperly Set.Suppressor Replaced W/Operable Spare Suppressor.No Danger to Public	/03L-0 on 790111:damaged Wiper Seal Found on Hydraulic Suppressor 1-FW-HSS-233.Caused by Poppet Valves Which Control Lock Up Rate Being Improperly Set.Suppressor Replaced W/Operable Spare Suppressor.No Danger to Public
05000338/LER-1979-006, Forwards LER 79-006/03L-0	Forwards LER 79-006/03L-0
05000338/LER-1979-007-03, /03L-0 on 781116:during Normal Operation,Fire Door S54-5 Between Unit 1 Emergency Switchgear Room & Cable Vault Was Sprung & Would Not Make a Tight Seal,Evidently Due to Attempt to Free It While Stuck	/03L-0 on 781116:during Normal Operation,Fire Door S54-5 Between Unit 1 Emergency Switchgear Room & Cable Vault Was Sprung & Would Not Make a Tight Seal,Evidently Due to Attempt to Free It While Stuck
05000338/LER-1979-008-01, /01T-0 on 790129:design Flow of 37 Gpm to Charging Pump Coolers Could Not Be Met.Caused by 2 Inch Carbon Steel Piping & Charging Pump Skid Piping Being Too Large to Allow Adequate Flow	/01T-0 on 790129:design Flow of 37 Gpm to Charging Pump Coolers Could Not Be Met.Caused by 2 Inch Carbon Steel Piping & Charging Pump Skid Piping Being Too Large to Allow Adequate Flow
05000338/LER-1979-009, Forwards LER 79-009/03L-0	Forwards LER 79-009/03L-0
05000338/LER-1979-009-03, /03L-0 on 790212:during Normal Operation,Snubber Support for C Steam Generator Atmosphere Discharge Line Found Damaged.Caused by Use of Support as Anchor for Chain Fall.Support Replaced	/03L-0 on 790212:during Normal Operation,Snubber Support for C Steam Generator Atmosphere Discharge Line Found Damaged.Caused by Use of Support as Anchor for Chain Fall.Support Replaced
05000338/LER-1979-010-03, /03L-0 on 790127: During Calibr of Containment Particulate Monitor RMS159 in Mode 1, Instrument Read Low for Known Radiation Level. Caused by Detector High Voltage Setting Being Set Too Low	/03L-0 on 790127: During Calibr of Containment Particulate Monitor RMS159 in Mode 1, Instrument Read Low for Known Radiation Level. Caused by Detector High Voltage Setting Being Set Too Low
05000338/LER-1979-011, Forwards LER 79-011/03L-0	Forwards LER 79-011/03L-0
05000338/LER-1979-011-03, /03L-0 on 790126:fire Door SS54-9 Was Nonfunctional.Caused by Removal of Latch from Door by Person or Persons Unknown	/03L-0 on 790126:fire Door SS54-9 Was Nonfunctional.Caused by Removal of Latch from Door by Person or Persons Unknown
05000338/LER-1979-012-03, /03L-0 on 790127: Unidentified Primary Coolant Leakage Greater than 5 Gpm Noted. Caused by Blown Packing on Residual Heat Removal Isolation Valve MOV-1700 & Packing Leak on Pressurizer Spray Valve PCV-1455A	/03L-0 on 790127: Unidentified Primary Coolant Leakage Greater than 5 Gpm Noted. Caused by Blown Packing on Residual Heat Removal Isolation Valve MOV-1700 & Packing Leak on Pressurizer Spray Valve PCV-1455A
05000338/LER-1979-013-03, /03L-0 on 790214:during Normal Operation,Fire Door S71-7 Between Auxiliary Bldg & Health Physics Found non- Functional.Caused by Bent Phaser on Left Door.Phaser Taped Out of Way & New Phaser Installed	/03L-0 on 790214:during Normal Operation,Fire Door S71-7 Between Auxiliary Bldg & Health Physics Found non- Functional.Caused by Bent Phaser on Left Door.Phaser Taped Out of Way & New Phaser Installed
05000338/LER-1979-014-03, /03L-0 on 790202:pressurizer Level Indicator Indicated High Over Allowable Range.Caused by Voltage Drift in Associated Level Transmitter.Appropriate Channel Placed in Trip Condition & Transmitter Recalibr	/03L-0 on 790202:pressurizer Level Indicator Indicated High Over Allowable Range.Caused by Voltage Drift in Associated Level Transmitter.Appropriate Channel Placed in Trip Condition & Transmitter Recalibr
05000338/LER-1979-014, Forwards LER 79-014/03L-0	Forwards LER 79-014/03L-0
05000338/LER-1979-015-03, /03L-0 on 790204:rod F08 Indicators in Disagreement.Caused by Voltage Drift in Signal Conditioning Card.Card Recalibrated & Functional Checks Performed Satisfactorily	/03L-0 on 790204:rod F08 Indicators in Disagreement.Caused by Voltage Drift in Signal Conditioning Card.Card Recalibrated & Functional Checks Performed Satisfactorily
05000338/LER-1979-015, Forwards LER 79-015/03L-0	Forwards LER 79-015/03L-0
05000338/LER-1979-016, Forwards LER 79-016/03L-0	Forwards LER 79-016/03L-0
05000338/LER-1979-016-03, /03L-0 on 790213:main Steam trip,TV-MS-111A,valve Opened to Only 75% Capacity.Caused by Improperly Positioned Needle Valve Which Supplied Air to Valve Actuator.Valve Repositioned & Operation Restored	/03L-0 on 790213:main Steam trip,TV-MS-111A,valve Opened to Only 75% Capacity.Caused by Improperly Positioned Needle Valve Which Supplied Air to Valve Actuator.Valve Repositioned & Operation Restored
05000338/LER-1979-017, Forwards LER 79-017/01T-0	Forwards LER 79-017/01T-0
05000338/LER-1979-017-01, /01T-0 on 790212:during Axial Power Distribution Monitoring Sys Failure on 790206,FQ Survey Computer Program Could Not Monitor Axial Power Distribution.Caused by Incorrect Power Inputs from Process Computer	/01T-0 on 790212:during Axial Power Distribution Monitoring Sys Failure on 790206,FQ Survey Computer Program Could Not Monitor Axial Power Distribution.Caused by Incorrect Power Inputs from Process Computer
05000338/LER-1979-018-03, /03L-0 on 790214:during Mode 1 Operation at 98% Power,Main Steam Trip Valve 1-TV-MS-111B Leaked Excessively & Was Isolated for Repair.Caused by Deteriorated Internal Gasket.Valve Isolated & Gasket Replaced	/03L-0 on 790214:during Mode 1 Operation at 98% Power,Main Steam Trip Valve 1-TV-MS-111B Leaked Excessively & Was Isolated for Repair.Caused by Deteriorated Internal Gasket.Valve Isolated & Gasket Replaced
05000338/LER-1979-019-03, /03L-0 on 790216:during Surveillance,Emergency Diesel Generator 1H Did Not Reach 900 Revolutions Per Minute in Required 10-s.Probable Cause Was Low Ambient Air Temp. Conditions of First Start Were Not Reproducible	/03L-0 on 790216:during Surveillance,Emergency Diesel Generator 1H Did Not Reach 900 Revolutions Per Minute in Required 10-s.Probable Cause Was Low Ambient Air Temp. Conditions of First Start Were Not Reproducible
05000338/LER-1979-020-03, /03L-0 on 790131:fire Door S54-9 Was Found to Be non-functional.Caused by Recently Installed Electric Door Strike Slipping Out of Adjustment	/03L-0 on 790131:fire Door S54-9 Was Found to Be non-functional.Caused by Recently Installed Electric Door Strike Slipping Out of Adjustment
05000338/LER-1979-020, Forwards LER 79-020/03L-0	Forwards LER 79-020/03L-0
05000338/LER-1979-021-99, /99T-0 on 790212:meterological Air Temp Change in Temp Indication Was Observed to Be off-scale Low.Caused by Faulty Resistance Temp Detector.Temp Element Replaced	/99T-0 on 790212:meterological Air Temp Change in Temp Indication Was Observed to Be off-scale Low.Caused by Faulty Resistance Temp Detector.Temp Element Replaced
05000338/LER-1979-021, Forwards LER 79-021/99T-0	Forwards LER 79-021/99T-0
05000338/LER-1979-022-03, /03L-0 on 790227:power Supply to Post DBA H Recombiner Deenergized Rendering Recombiner Inoperable for 4-h.Caused by Deenergizing of Motor Control Center to Perform Voltage Measurements	/03L-0 on 790227:power Supply to Post DBA H Recombiner Deenergized Rendering Recombiner Inoperable for 4-h.Caused by Deenergizing of Motor Control Center to Perform Voltage Measurements
05000338/LER-1979-023, Forwards LER 79-023/03L-0,79-025/03L-0 & 79-031/03L-0	Forwards LER 79-023/03L-0,79-025/03L-0 & 79-031/03L-0
05000338/LER-1979-023-03, /03L-0 on 790303:disagreement Noted Between Group & Individual Indication for Rod D-10.Caused by Voltage Drift in Conditioning Card.Calibr & Functional Checks Were Performed	/03L-0 on 790303:disagreement Noted Between Group & Individual Indication for Rod D-10.Caused by Voltage Drift in Conditioning Card.Calibr & Functional Checks Were Performed
05000338/LER-1979-024, Forwards LER 79-024/43X-1	Forwards LER 79-024/43X-1
05000338/LER-1979-024-43, /43X-1:on 790228,radwaste Release Occurred Unexpectedly During Pumping of Unit 2 Containment Sump Via Temporary Pump to Storm Drain Sys.Caused by Pressure Relief Valve Leaks in Units 1 & 2 Purge Headers	/43X-1:on 790228,radwaste Release Occurred Unexpectedly During Pumping of Unit 2 Containment Sump Via Temporary Pump to Storm Drain Sys.Caused by Pressure Relief Valve Leaks in Units 1 & 2 Purge Headers
05000338/LER-1979-025-03, /03L-0 on 790228:power Range Channel N42 Placed in Tripped Condition.Caused to Allow Replacement of Erratic Delta Flux Indicator.Indicator Replaced & Power Range Detector Returned to Svc	/03L-0 on 790228:power Range Channel N42 Placed in Tripped Condition.Caused to Allow Replacement of Erratic Delta Flux Indicator.Indicator Replaced & Power Range Detector Returned to Svc
05000338/LER-1979-026-03, /03L-0 on 790306:RHR Discharge Valve Opened Accidentally Causing Loop C Accumulator Level to Drop Below Min Volume Required.Caused by Accidental Operation of MOV-1720B.Valve Closed & Loop Accumulator Level Restored	/03L-0 on 790306:RHR Discharge Valve Opened Accidentally Causing Loop C Accumulator Level to Drop Below Min Volume Required.Caused by Accidental Operation of MOV-1720B.Valve Closed & Loop Accumulator Level Restored
05000338/LER-1979-027-03, /03L-0 on 790225:axial Flux Difference Deviated Greater than 5% from Target.Caused by Xenon Transient Occurring During Startup Operation.Corrected by Boration by Reactor Operator	/03L-0 on 790225:axial Flux Difference Deviated Greater than 5% from Target.Caused by Xenon Transient Occurring During Startup Operation.Corrected by Boration by Reactor Operator
05000338/LER-1979-027, Forwards LER 79-027/03L-0	Forwards LER 79-027/03L-0
05000338/LER-1979-028-03, /03L-0 on 790225:greater than 12-step Disagreement Noted Among Rod Position Indication,Computer Position Indication & Demand Signal Indication for Rod 9.Caused by Voltage Drift in Signal Conditioning Card	/03L-0 on 790225:greater than 12-step Disagreement Noted Among Rod Position Indication,Computer Position Indication & Demand Signal Indication for Rod 9.Caused by Voltage Drift in Signal Conditioning Card
05000338/LER-1979-030-03, /03X-1 on 790308:nonconservative Gain Setting on delta-flux Signal Feeding Overpower Delta T Protection Circuitry Observed.Caused by Improper Setting of delta-flux Gain.Signal Recalibr	/03X-1 on 790308:nonconservative Gain Setting on delta-flux Signal Feeding Overpower Delta T Protection Circuitry Observed.Caused by Improper Setting of delta-flux Gain.Signal Recalibr
05000245/LER-1979-030-03, /03L-0 on 790308:calibr Procedure Revealed Nonconservative Gain Setting on delta-flux Signal Feeding Overpower Delta T Protection Circuitry.Caused by Improper Setting of delta-flux Gain.Signal Recalibrated	/03L-0 on 790308:calibr Procedure Revealed Nonconservative Gain Setting on delta-flux Signal Feeding Overpower Delta T Protection Circuitry.Caused by Improper Setting of delta-flux Gain.Signal Recalibrated
05000338/LER-1979-031-03, /03L-0 on 790302:surveillances of Engineered Safety Feature Pumps Not Performed within Interval.Caused by Personnel Error Due to Long Period from Preoperational Tests to Operation.Surveillances Will Be Performed	/03L-0 on 790302:surveillances of Engineered Safety Feature Pumps Not Performed within Interval.Caused by Personnel Error Due to Long Period from Preoperational Tests to Operation.Surveillances Will Be Performed
05000338/LER-1979-032-03, /03L-0 on 790312:containment Vacuum Pump Suction Valve TV-CV150A Would Not Remain Closed When Operated from Control Room.Caused by Relay Sticking in Energized Position.Relay Repaired & Tested Satisfactorily	/03L-0 on 790312:containment Vacuum Pump Suction Valve TV-CV150A Would Not Remain Closed When Operated from Control Room.Caused by Relay Sticking in Energized Position.Relay Repaired & Tested Satisfactorily
05000338/LER-1979-032, Forwards LER 79-032/03L-0	Forwards LER 79-032/03L-0
05000338/LER-1979-033, Forwards LER 79-033/03L-0,79-036/03L-0,79-037/03L-0 & 79-038/03L-0	Forwards LER 79-033/03L-0,79-036/03L-0,79-037/03L-0 & 79-038/03L-0
05000338/LER-1979-033-03, /03L-0 on 790321: C Steam Generator Narrow Range Level Indicator LI-1496 Gave Readings w/20% Disagreement W/Two Other Channels.Caused by Steam Leak in One Sensing Line Isolation Valve	/03L-0 on 790321: C Steam Generator Narrow Range Level Indicator LI-1496 Gave Readings w/20% Disagreement W/Two Other Channels.Caused by Steam Leak in One Sensing Line Isolation Valve
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