05000280/LER-1980-028-03, W/Unit at 100% Power, Reduction in Svc Water Pressure to Charging Pump Experienced.Caused by Missing Valve Disk for 2-SW-113.Check Valve Replaced
05000280/LER-1979-014-03, /03L-0 on 790422:liquid Waste Disposal Radiation Monitor Failed to Give High Alarm & Trip Release Valve. Caused by Instrument Drift in High Alarm Setpoint.All Liquid Waste Releases Were Secured & Alarm Board Checked
05000280/LER-1978-047-03, /03X-1 on 781211:primary to Secondary Leakage in C Steam Generator Exceeded Allowable Limit.Caused by Leakage Through Five Steam Generator Tubes,Combined Flow Resulted in Excessive Leakage
05000280/LER-1978-030-03, /03L-0 on 781009:w/unit at Rated Pwr,Charging Pump Component Cooling Water Pump Btripped.Pump Tripped on Overcurrent.Caused by Corrosion Damage to Motor Bearings. Pump & Motor Rebuilt & Reinstalled
05000280/LER-2078-009-03, L Re Snubber Body in Contact with Structure; LER 1978-009-03L Re Trip of Boric Acid Transfer Pump; & LER 1978-010-03L Re Failure of Pressurizer Channel
0CAN029902, Forwards Response to NRC 990205 RAI Re Proposed AC TS Changes
05000280/LER-1983-022-03, /03L-0:on 830505,w/unit at Cold Shutdown,Special Test Showed Flow Orifice Used During Control Room Leakage Test Would Not Simulate Emergency Bottle Air Pressurization. Orifice Modified
05000280/LER-1983-038-03, /03L-0:on 830829,at 100% Power,Svc Water Pumps 1-SW-P-10A & 1-SW-P-10B Failed to Develop Sufficient Discharge Pressure When Redundant Water Supply Header Isolated.Caused by Npsh.Pumps Vented
05000281/LER-1983-037-03, /03L-0:on 830918,w/unit at Cold Shutdown, During H & J Train Safety Injection Sys Tests,Main Feed Regulation Valve Would Not Fully Close on Signal.Cause Undetermined
05000281/LER-1983-036-03, /03L-0:on 830918,w/unit at Cold Shutdown,During Performance of H & J Train Safety Injection Sys Tests, Feedwater Valve Would Not Fully Close on Signal.Caused by Out of Adjustment Pneumatic Relay Valves
05000295/LER-1983-031-03, /03L-0:on 830819,while Reviewing MSIV Schematic Drawings,Continuity of Keane Solenoid Valve Coil & Hfa Operate Relay Coil Could Not Be Verified Using Existing Test Procedure.Procedure Change Initiated
05000280/LER-1976-012-03, /03L:on 760909,low Pressure Alarm Occurred on Safety Injection Accumulator C.Caused by HCV 1936 Partially Open & Body to Bonnet Leaks on HCV-1898 & 1549.Repairs Made on HCV 1936,1898 & 1549
05000281/LER-1976-015-03, /03L:on 761006,leakage of Water Observed from Recirculation Spray HX a Piping.Caused by Cloride Stress Corrosion of Type 304 Stainless Steel Piping.Repairs Will Be Made Following Investigation
05000281/LER-1976-016-03, /03L:on 761230,boron Injection Tank (Bit) Concentration Was 11.4% Weight.Caused by Leakage Through Bit Inlet Valves MOV-2867A & B.Boric Acid Batched to Storage Tank C Concentration to 11.9%
05000280/LER-1976-016-03, /03L:on 761101,comparator TC-1-432C Failed to Trip.Caused by Power Capacitor Malfunction.Comparator Replaced
05000280/LER-1976-008-03, /03L:on 760702,safety Injection Accumulator B Indicated 1,928 Ppm Boron.Caused by Leaking Check Valves 1-SI-128 & 1-SI-130.Accumulator Recirculated in Raw Water Storage Tank to Increase Boron Concentration
05000280/LER-1977-001-03, /03L:on 761113,pressurizer Safety Valve Setpoints for Valves SV-1551A & SV-1551B Found Below 2,485 Psig Requirement.Caused by Setpoint Drift.Testing Procedure Will Be Revised
05000280/LER-1977-010-03, /03L:on 770328,high Steam Flow Relay FC-485-XA Malfunctioned.Caused by Foreign Matl Impregnating Bf Relay. Debris Removed
05000280/LER-1977-006-03, /03L:on 770208,charging Pump Cooling Water Pump 1-CC-P-2A Tripped Due to Thermal Overload.Caused by Faulty Motor Bearings.Bearings Replaced & Minor Mechanical Defects Corrected
05000281/LER-1977-001-03, /03L:on 770118,recirculation Flow from Boric Acid Tank B Ceased.Caused by Broken Coupling Between Motor & Pump on Transfer Pump 1-CH-P-20.Coupling Repaired
05000280/LER-1977-007-03, /03L:on 770215,safety Valve SV-MS-101A Lifted Prematurely at Approx 950 Psi,Below Normal Setpoint of 1,085 Psi.Caused by Torque Limiting Device Setting Low Causing Drift.Safety Valves Reset
05000281/LER-1977-003-03, /03L:on 770209,loop C Cold Protection Channel T-432 Failed.Caused by Malfunction of Span Potentiometer in Low Level Amplifier TM-2-432.Amplifier Replaced W/Shop Spare
05000280/LER-1977-009-03, /03L:on 770219,chemical Addition Tank Discharge Valve MOV-CS-102A Position Indicating Lights Extinguished. Caused by Incorrectly Wired Switch.Maint Procedure Revised
05000281/LER-1977-002-03, /03L:on 770126,ability to Maintain Recirculation Between Boric Acid Tank & Boron Injection Tank Lost.Caused by Obstruction in Line from Tank C to Transfer Pumps. Line Back Flushed
05000280/LER-1982-125-03, /03L-0:on 821221,w/unit at Full Power,Periodic Test 2.1 Revealed That Output of Loop a Delta T Summator Below Acceptable Limits.Caused by Instrument Drift.Summator Recalibr & Returned to Svc
05000280/LER-1982-127-03, /03L-0:on 821228,while Gaseous Release in progress,RR-175 Indicated off-scale Process Vent Gaseous Radiation Monitor RM-GW-102.Caused by Failure of Discriminator Printed Circuit Board.Board Replaced
05000280/LER-1983-055-03, /03L-0:on 831126,core Cooling Monitor a Observed Displaying Erratic Indications & Declared Inoperable.Caused by Faulty Computer Card.Replacement Card Installed
05000280/LER-1983-051-03, /03L-0:on 831110,suction Line for Containment Vacuum Pump B 1-CV-P-1B Inadvertently Blank Flagged.Caused by Incorrect Identification by Operator.Flange Removed & Pump Verified Operable.Operator Disciplined
05000280/LER-1983-049-03, /03L-0:on 831102,performance of Heat Tracing Periodic Test Revealed Ampere Readings for Heat Tracing Circuits 23A,24C,22A & 24D Not within Test Limits.Caused by Excessive Heat.Heat Tracing Replaced
05000280/LER-1983-048-03, /03L-0:on 831024,discharge Pressure of Charging Pump B Pump CC Decreased to Point Which Automatically Started Redundant Pump.Caused by Closed Valve LCV-CC-001
05000280/LER-1983-045-03, /03L-0:on 831010 & 17,core Cooling Monitor a Declared Inoperable Following Erratic Indication.Cause of 831010 Event Not Determined.Event on 831017 Caused by Bad Connector in Power Supply.Supply Replaced
05000280/LER-1982-105-03, /03L-0:on 821123,amplifier Reading for Heat Tracing Panel 9,circuit 7A,fell Below Acceptance Criteria.On 821126,low Reading Detected for Panel 8.Caused by Excessive Heat.Defective Heat Tracing Replaced & Tested
05000281/LER-1983-019-03, /03L-0:on 830415,MOV-LCV-2115D Failed to Open During Performance of PT18.6.Caused by Motor Leads Not Making Contact Due to Loose Plug in Terminal Strip in Motor Control Ctr.Terminal Strip Properly Seated
05000280/LER-1983-031-03, /03L-0:on 830710,w/Unit 1 at 100% Power, Containment Temp Exceeded 120 F for Approx 3 H.Caused by Incorrect Data Supplied by Unit 2 Computer.Data Corrected
05000280/LER-1983-020-03, /03L-0:on 830408,20 of 58 Snubbers Failed to Meet Acceptance Criteria Stipulated in Periodic Test.Caused by Seal Degradation.Snubbers Either Readjusted,Repaired or Replaced
05000281/LER-1983-018-03, /03L-0:on 830406,at 100% Power,Control Rod B-6 Dropped to Fully Inserted Position Causing Quadrant Power Tilt or Turbine Runback.Cause Unknown.Fuses & Other Components Operable.Control Rod Withdrawn
05000280/LER-1983-016-03, /03L-0:on 830310,undervoltage (UV) Relay Setpoints for Bus a & Phase A-B UV Relay Setpoint for Bus C Indicated Less than Tech Specs.Caused by Instrument Drift.Undervoltage Relays Reset
05000280/LER-1983-015-03, /03L-0:on 830307,w/fuel Movement in Progress,Valve 1-GN-3 Removed,Resulting in Unisolated Path from Containment to Outside Atmosphere & Violation of integrity.Open-ended Pipe Capped
05000281/LER-1983-007-03, /03L-0:on 830217,operators Discovered Heat Tracing Panels 8 & 9 Circuit 2 & 13 Tagged Out & de-energized.Caused by Operator Improperly Performing Tagout Procedure.Circuits Energized & Verified Operable
05000281/LER-1983-024-03, /03L-0:on 830517,PT-27D Revealed That Ampere Readings for Heat Tracing Panel 8,Circuit 13C Below Acceptance Criteria in PT-27D.Caused by Excessive Heat. Defective Heat Tracing Replaced
05000280/LER-1982-010-03, /03L-0:on 820105,while Removing Unit from Svc, Spurious Safety Injection Signal Generated & Trip Valve Failed to Close.Cause Not Found.Investigation Continuing
05000280/LER-1982-007-03, /03L-0:on 820119,PT-27C Revealed Amp Reading for Heat Tracing Panel 9,circuit 20B Below Acceptance Criteria. Caused by Excessive Heat.Defective Heat Tracing Replaced & Tested
05000280/LER-1983-007-03, /03L-0:on 830204,at 85% Power,Latch Mechanism of Fire Door 20 Taped Over,Causing Fire Barrier to Be Inoperable.Caused by Const Personnel Error.Tape Removed & Door Returned to Operable Status
05000280/LER-1982-126-03, Rod Position Indication for Control Rod F-4 Indicated Erratically & Fluctuated Greater than 12 Steps.Cause Unknown.Erroneous Signal Suspected of Being Inside Containment.Testing Underway
05000281/LER-1983-001-03, /03L-0:on 830118,amp Readings for Heat Tracing Panel 8,circuit 13B,fell Below Acceptance Criteria.Caused by Excessive Heat.Defective Heat Tracing Replaced & Tested. Design Change Prepared
05000280/LER-1982-107-03, /03L-0:on 821221,at 100% Power,Testing Revealed Amp Readings for Heat Tracing Panels 8 & 9,redundant Circuits 17A Below Tech Spec Limits.Caused by Excessive Heat.Defective Heat Tracing Replaced
05000280/LER-1982-128-03, /03L-0:on 821228,at 100% power,PT-27D Revealed Amp Readings for Heat Tracing Panel 9,circuit 4B Above Test Criteria.Caused by Excessive Heat.Defective Heat Tracing Replaced & Tested.Design Change Initiated
05000281/LER-1982-007-03, /03L-0:on 820118,periodic Test 10 Revealed Unidentified Leak Rate Greater than 1 Gallon Per Minute. Caused by Inlet Flange Leak on Relief Valve.Flange Gasket Replaced
05000281/LER-1982-008-03, /03L-0:on 820118,fault Occurred on Feeder Cables to B Reserve Station Svc Transformer.Isolation of Fault de-energized Emergency Bus.Caused by Flashover to Ground & to Adjacent Phase Due to Spraying of Insulators
05000280/LER-1982-116-03, /03L-0:on 821113,containment Spray Chemical Addition Tank Level Decreased Below Tech Spec Limit.Caused by Loss of Vol Due to Leakage Past Manual Isolation Valve During Maint.Valve Torqued Shut.Tank Refilled
05000281/LER-1983-006-03, /03L-0:on 830214,during Full Power,Trip Valve TV-DA-200B Failed to Close When Containment Sump Pump Stopped.Caused by Defective solenoid-operated Valve.Valve Replaced
05000280/LER-1982-120-03, /03L-0:on 821020,w/unit at 100%,both Containment Vacuum Pumps Declared Inoperable.Caused by Sliding Vanes Becoming Bound to Respective Guide Slots Due to Water Damage to Carbon Vanes.Broken Belt Replaced on Pump 1-CV-P-1B
05000280/LER-1982-102-03, /03L-0:on 820923,discovered Pin Attaching Snubber 1-SHP-HSS-35B to Main Steam Line Partially Out & Snubber Cocked.Caused Undetermined.Snubber Straightened & Pins Properly Installed
05000280/LER-1982-103-03, /03L-0:on 820927,amp Readings for Heat Tracing Panel 2 Circuit 24D Found Below Acceptance Level.Cause Unknown.Defective Heat Tracing Replaced & Design Change Initiated
05000281/LER-1982-056-03, /03L-0:on 820907,pressure in Nitrogen Bottle Supplying Emergency Air to PCV-MS-202A & B Discovered Below Limit.Caused by Leaking Nitrogen Bottle Connection. Replacement Bottle Correctly Installed
05000280/LER-1982-087-03, /03L-0:on 820901 & 20,pump 1-SW-P-10A Experienced Loss of Suction Power & on 820901,14 & 20,pump 1-SW-P-10A Experienced Similar Loss of Suction.Cause Due to Insufficient Npsh.Svc Water Replaced.Svc Water Pumps Vented
05000280/LER-1982-054-03, /03L-0:on 820905,unattended Portable Pump in Use to Clean Waterbox C Swung Around & Flooded Svc Water Pit Containing Svc Water.Valve MOV-SW-202B Grounded in Open Position.Caused by Operator error.MOV-SW-202B Dried
05000280/LER-1982-124-03, /03L-0:on 821214,svc Water Inlet Valve to Recirculation Spray HX,MOV-SW-103C,inadvertently de-energized & Red Tagged.Caused by Personnel Error.Tag Removed & Breaker Closed.Personnel Disciplined
05000281/LER-1982-074-03, /03L-0:on 821211,w/unit in Cold Shutdown,Pt 39B-2 Revealed 2-RC-HSS-162 & 163 & 2-RH-HSS-5 Snubbers Had Low Levels in Reservoirs.Caused by Leak in Reservoir Sight Glass & on Pipe Fitting to Valve Block
05000280/LER-1978-028-03, /03L-0 on 780916:snubber Not Meeting Inspec Criteria Caused by Low Oil Level Due to Leakage at Mating Surface Between Body & End Plate.Holding Bolts Were Tightened & Snubber Was Refilled
05000280/LER-1982-096-03, /03L-0:on 820916,w/unit at 99% power,PT-27C Revealed That Amp Readings for Heat Tracing Panel 9,circuit 19,was Below Acceptance Criteria.Caused by Excessive Heat. Defective Heat Tracing Replaced & Tested
05000280/LER-1982-086-03, /03L-0:on 820827,radiation Monitor RM-LW-10F Indicated 9.0E4 CPM W/O Annunciation of Alarm.Caused by Defective Push Button & Setpoint Drift.Push Button Replaced & Monitor Recalibr
05000281/LER-1981-042-03, /03L-0:on 810719,containment Spray Chemical Addition Tank (Cat) Level Found Below Tech Specs.Caused by Leaking Valve MOV-CS-202B.Valve Scheduled for Repair During Next Outage.Tank Level Restored
05000280/LER-1982-083-03, /03L-0:on 820831,performance of PT-27E Revealed That Amp Reading for Heat Tracing Panel 9,circuit 2B,was Below Acceptance Criteria.Caused by Excessive Heat.Heat Tracing Replaced & Tested
05000280/LER-1982-076-03, /03L-0:on 820803,performance of PT-27A Revealed That Amp Reading for Heat Tracing Panel 1,circuit 23A Was Below Acceptance Criteria Stipulated in Pt.Caused by Excessive Heat.Defective Heat Tracing Replaced & Tested
05000280/LER-1982-033-03, /03L-0:on 820530,w/unit at 96% Power,Charging Pump Svc Water Pump 2-SW-P-10B Failed to Develop Sufficient Discharge Pressure.Caused by Insufficient Npsh.Svc Water to Chillers Throttled
05000280/LER-1982-079-03, /03L-0:on 820701,during Periodic Test 6,control Rods from Cabinet 2AC Did Not Respond to Demand Signal. Caused by Faulty Phase Control Card.Card Replaced & Periodic Test Completed
05000280/LER-1982-075-03, /03L-0:on 820626,setpoint for CC Rad Monitor RM-CC-105 Discovered Greater than Twice Background.Caused by Decreasing Activity in Computer Cooling Sys.Setpoint Readjusted W/New Background Activity Levels
05000280/LER-1982-073-03, /03L-0:on 820622,charging Pump Svc Water Pump 1-SW-P-10B Failed to Develop Adequate Discharge Pressure. Caused by Insufficient Npsh.Svc Water to Chillers Throttled to Provide Sufficient NPSH
05000280/LER-1982-065-03, /03L-0:on 820609,w/unit at 100% Power,Core Cooling Monitor Channel B Failed,Resulting in Spurious Alarms.Caused by Faulty Thermocouple Input.Input Replaced
05000280/LER-1982-052-03, /03L-0:on 820428,amplifier for Heat Tracing Panel B,Circuit 2B,read Below Acceptance Criteria.Caused by Excessive Heat.Defective Heat Tracing Replaced & Tested. Design Change Initiated
05000281/LER-1982-013-03, /03L-0:on 820124,radioiodine Sample Taken 6-h & 28 Minutes Following Thermal Power Increase,Exceeded Tech Spec Time Limit.Caused by Delayed Oncoming Shift Chemists Due to Traffic Problems
05000280/LER-1982-019-03, /03L-0:on 820202,PT-27 Revealed Ampere Readings for Heat Tracing Circuits 24C,25A,panel 2 & Circuit 24D, Panels 1 & 2 (Boron Injection Tank Recirculation Line) Below Acceptance Criteria.Caused by Loss of Heat Tracing
05000280/LER-1982-023-03, /03L-0:on 820212,PT-39B.2 & PT-39B.1 Revealed That Snubbers 1-RC-HSS-131,1-WFPD-HSS-15 & 1-SHP-HSS-35B Were Inoperable Due to Low Oil Reservoir Level.Caused by Seal Leakage.Snubbers Replaced &/Or Repaired
05000280/LER-1982-022-03, /02L-0:on 820209,relief Valve RV-GW-103 Opened Causing Pressure Transient in Process Vent Sys & Damaging Process Vent Flow Transmitter.Caused by Momentary Pressure Spike That Overranged Flow Transmitter.Transmitter Replaced
05000280/LER-1982-006-03, /03L-0:on 820211,w/unit at 100% power,PT-27 Revealed That Amp Readings for Heat Tracing Panel 11,circuit 6A Was Below Acceptance Criteria.Caused by Excessive Heat. Defective Heat Tracing Replaced & Tested
05000280/LER-1982-020-03, /03L-0:on 820205,w/unit at 100% Power,Loss of Boric Acid Flow to Blender Was Observed.Caused by Operating Mechanism Failure on Valve 1-CH-88.Valve Mechanism Repaired
05000280/LER-1982-005-03, /03L-0:on 820207,trip Valve TV-SS-204B Was Discovered Open & Would Not Close W/O Operator Intervention. Caused by Misalignment of Actuation Disk.Actuation Disk Adjusted
05000281/LER-1981-081-03, /03L-0:on 811229,containment Isolation Valve, 2-VA-1,found Unlocked,Open & Unattended.Caused by Supervisor Failing to Recognize That Valve Had Been Opened to Allow Venting of C Loop.Valve Closed & Locked
05000281/LER-1981-083-03, /03L-0:on 811231,steam Flow Instruments FI-474 on a Main Stream Line & FI-485 on B Main Stream Line Found Isolated.Caused by Instruments Inadvertently Left Isolated Until Discovery During Startup
05000280/LER-1981-081-03, /03L-0:on 811222,both Containment Vacuum Pumps Were Inoperable.Caused by Sliding Vanes in Pump Rotor Binding in Guide Slots.One Pump Replaced & Other Repaired
05000280/LER-1981-083-03, /03L-0:on 811223,at 100% Power,Sliding Fire Door Between Units 1 & 2 Emergency Switchgear Rooms Found Partially Open & Unattended.Caused by Disconnected Counterweight;Intact Weight Acted to Partially Open Door
05000280/LER-1981-082-03, /03L-0:on 811231,during Biweekly Control Rod Assembly Partial Movements Test PT-6,rod J-9 Found Inoperable.Caused by Failure of Connector Pin in Lift Coil Wiring to Make Electrical Contact.Pin Pulled Up & Locked
05000280/LER-1981-076-03, /03L-0:on 811206,w/both Units at Cold Shutdown, Fuel Level in Diesel Fire Pump Fuel Tank Was Found to Be 215 Gallons,Below Tech Spec Limit.Caused by Administrative Oversite.Personnel Reinstructed
05000281/LER-1981-071-03, /03L-0:on 811107,setpoints of 2 Main Steam Safety Valves Not within Plus or Minus 3% of Required Value.Caused by Normal Setpoint Drift.Setpoints Adjusted
05000280/LER-1981-066-03, /03L-0:on 811027,technical Review Found Not Yet Begun on Design Change Package That Relocated Portions of Yard Firemain Piping.Caused by Project Engineer Administrative Error.Documents Updated
05000280/LER-1981-061, Forwards LER 81-061/03L-0.Detailed Event Analysis Encl
05000280/LER-1981-064-03, /03L-0:on 811020,PT-27 Revealed Amp Readings for Heat Tracing Panels 8 & 9,circuit 13A Were Below Acceptance Criteria.Caused by Excessive Heat.Heat Tracing Replaced & Tested
05000281/LER-1981-064-03, /03L-0:on 811008,during Charging Pump Svc Water Surveillance testing,2-SW-P-10B Failed to Develop Required Discharge Pressure & Was Declared Inoperable.Caused by Loss of Npsh.Svc Water Flow Adjusted & Pump Vented
05000280/LER-1981-042-03, /03L-0:on 810902,high Alarm Setpoint for Component Cooling Radiation Monitor RM-CC-105 Was Exceeded W/O Surge Tank Vent Closing or Annunciator Alarming.Caused by Failed Log Ratemeter Card.Card Replaced & Instrument Recalibr
05000280/LER-1981-030-03, /03L-0:on 810721,at 100% Power,Readings for Heat Tracing Panel 9 Circuits 25A & 7A Were Below Acceptance Criteria.Caused by Electrical Malfunction.Defective Heat Tracing Replaced & Tested.Design Change Initiated
05000280/LER-1982-101-03, /03L-0:on 821009,snubbers 1-SHP-HSS-35B, 1-SW-MSS-2,1-S1-HSS-100,1-WFPD-HSS-14,WFPD-HSS-15 & 1-RC-HSS-116 Found Inoperable.Caused by Fitting Leaks & Failure to Stroke Due to Corrosion.Snubbers Replaced
05000281/LER-1982-051-03, /03L-0:on 820816,at 100% Power,Heat Tracing Circuit 23C on Panel 8 Found Below Criteria.Cause of Loss Unknown.Defective Heat Tracing Replaced & Tested.Design Change Implemented
05000281/LER-1982-047-03, /03L-0:on 820812,while at 100% Power,During Performance of PT 18.6B,trip Valve TV-CC-209B Would Not Close When Manually Operated.Caused by Sticking Pilot Valve. Air Supply to Pilot Valve Disconnected
05000295/LER-1983-020-03, /03L-0:on 830713,unidentified RCS Leak Rate of Approx 1.6 Gpm Found.Caused by Packing Leakage of 0.8 Gpm of Two Boron Injection Tank Inlet Valves.Work Requests Issued & Leakage Reduced to Less than 1 Gpm
05000304/LER-1983-022-03, /03L-0:on 830626,steam Generator 2D Feedwater Flow Channel 2F-531 Observed Tracking Low.Caused by Transmitter 2FT-531 Drifting.Transmitter Replaced W/Spare & Replacement Being Evaluated
05000304/LER-1983-018-03, /03L-0:on 830527 & 29,steam Generator 2D Steam Flow Channel 2F-533 Observed Spiking Erratically.Caused by Electronic Clock Circuitry in Extractor Out of Alignment. Module Replaced
05000304/LER-1983-014-03, /03L-0:on 830427,during Visual Insp,Snubbers Msrs 150-2,MSRS 150-11 & Sirs 2135 Failed to Lock Up in Tension &/Or Compression.Caused by Hydraulic Fluid Leak Due to Poor Seal Condition
05000281/LER-1983-015-03, /03L-0:on 830402,PT-27A Revealed That Amp Readings for Heat Tracing Panel 10 Circuit 1B & Panel 11 Circuits 2A, 4A & 6B Below Acceptance Criteria.Caused by Excessive Heat. Defective Heat Tracing Replaced & Design Change Init
05000280/LER-1981-041-03, /03L-0:on 810820,PT-27D Revealed That Amp Readings for Heat Tracing Panel 9 Circuit 7A Were Below Acceptance Criteria.Caused by Inadvertent Cutting of Heat Tracing Tape During Cleanup Operations on Boric Acid Flat
05000280/LER-1981-026-03, /03L-0:on 810709,during Startup,Max Allowable Containment Partial Pressure Was Exceeded.Caused by Feedwater Leak Through Failed Flange Gasket for Auxiliary Feedwater Line Flow Limiting Venturi.Gaskets Replaced
05000280/LER-1981-024-03, /03L-0:on 810701,fire Seal in Penetration Not Restored & Fire Watch Not Maintained Following Installation of New Cables.Caused by Const Personnel Error.Fire Barrier Sealed.Const Personnel Reinstructed
05000280/LER-1981-045-03, /03L-0:on 810703,BIT Recirculation Valves Closed. Caused by Isolation of Instrument Air to Auxiliary Bldg to Avert Reactor Trip.Air Line Break Isolated & Auxiliary Bldg Instrument Air Restored,Reopening Valves
05000280/LER-1981-063-03, /03L-0:on 811019,charging Pump Svc Water Pump 1-SW-P-10B Found to Have Zero Discharge Pressure Because of Loss of Suction to Pump.Caused by Increased Use of Svc Water by Chillers.Flow to Chillers Throttled
05000304/LER-1980-009, /03L-0 for Zion Re Conditions Leading to Operation in a Degraded Mode Permitted by a Limiting Condition for Operation or Plant Shutdown Required by a Limiting Condition for Operation Requires a 30 Day Written Report
05000280/LER-1979-011-03, /03X-1 on 790828:process & Ventilation Particulates & Gaseous Monitors Were W/O Power on Two Occasions.Caused by Loose Lug Connection on Power Supply Cable.Loose Connection Repaired & Plants Restored to Svc
05000304/LER-1978-079, Forwards LER 78-079/03X-1.Update Notes Rept Number Change from 78-077 to 78-079
05000304/LER-1977-082, Forwards LER 77-082/03L-0,reclassified as Reportable on 790126
05000304/LER-1977-081, Forwards LER 77-081/03L-0,reclassified as Reportable on 790109 After Internal Review
05000280/LER-2079-011-03, X for Surry Units 1 & 2 Loss of Power with Both Units at Cold Shutdown, Observed Radiation Monitors Without Power
05000280/LER-2076-012, Re Routine Sample of C Safety Injection Accumulator Indication of 1893 Ppm Boron
05000280/LER-2077-001, Re Cease of Recirculation Flow from B Boric Acid Tank
05000280/LER-2078-013-03, L for Surry Unit 2 Reactor Brought Critical Below Minimum Insertion Limit on D Control Bank
05000280/LER-2078-015-03, L for Surry Unit 2 Finding of Air Leak on Header of Control Room Emergency Air Supply Bank
05000280/LER-2078-007-03, L Re Failure of Sola Transformer, & LER 1978-007-03L Re Trip of Boric Acid Transfer Pump on Thermal Overload
05000280/LER-2077-007, Low Boron Injection Tank and C Boric Acid Storage Tank Concentration
05000280/LER-2078-004-03, L Re Erroneous Readings of Loop a Hot Leg Temperature Protection Channel; LER 1978-004-03L Re Unqualified Welding of Two Diaphragm Welds on Heat Exchanger; & LER 1978-005-03L Re Low Current Condition from Heat Tracing
05000280/LER-2078-014-03, L for Surry Unit 2 Charging Pump Service Water Pump a Tripped on High Current
05000280/LER-2078-028-03, L-0 for Surry 2 Re Containment Pressure Exceeded Allowable Limit
05000280/LER-1978-029-03, X-1, LER 78-029-03L-0, & LER 78-031-03L-0 for Surry 2 Re Critical Below Minimum Insertion Limit on D Control Bank
05000280/LER-2076-016, Re Low Boron Concentration of 11.4% by Weight in Boron Injection Tank
05000280/LER-2076-008, Re Electronically Non-Operable Condenser Outlet Valve MOV-CW-200B
05000280/LER-2078-011-03, L for Surry Unit 1 Loss of Service Water Flow Through Charging Pump Intermediate Seal Cooler
05000280/LER-2078-023-03, L-0 Re Axial Power Distribution Monitoring Was Exceeded,& Three LERs 1978-021-03L-0, LER 1978-023-03L-0, & LER 1978-024-03L-0 Re Inlet Circulating Water Temperature Exceeded
05000280/LER-2078-025-03, L for Surry Unit 2 Excessive Gap Around Battery Room Ventilation Duct
05000280/LER-2078-003, /03L-0. Follow-up Inspection for Valve Cleanliness, Discovered That Containment Spray Isolation Valves (MOV-CS-201C and D) Contained No More That Five Milliliters. Technical Specification TS 6.6.2.b.(3)
05000280/LER-2077-013-03, L Re Low Concentration of Boron Injection Tank and C Boric Acid Storage Tank
05000280/LER-2076-015, Re Leakage of Water from a Recirculation Spray Heat Exchange Piping
05000280/LER-1978-027, Submit LER 78-027/03L-0 Re Seven Snubbers Not Meeting Inspection Criteria
05000280/LER-2077-020-03, L Re Failure of Valve to Close After Opening, & LER 1977-020-03L Two Containment Temperature Was Less than 100 Degrees F
05000280/LER-1978-017, Submit Licensee Event Report Nos. LER 78-017/03L-0 Re Not Documenting Four Electric Maintenance Procedures & Two Periodic Tests, & 78-020/03L-0 Re Suspended Air Bubbles in Reservoir Fluid
05000280/LER-1978-003, Submit Licensee Event Report No. LER-78-003/03L-0 Re Failed Heat Tracing, Panel 8 Circuit 24
05000280/LER-2077-003, Submit Reportable Occurrence No. RO-S1-77-03 Re Failure of Trip Valves to Close from Control Panel
05000280/LER-1978-018, Sutmit Licensee Event Report No. LER 78-018/03L-0 Re Two Main Steam Safety Valves Were Not within Plus or Minus 3% of Setpoint as Required
05000280/LER-2077-019, Submit Reportable Occurrence No. RO-S1-77-19 Re More than One Snubber Inoperable
05000280/LER-1978-012, Submit Licensee Event Report No. LER-78-012/03L-0 Re Inside Recirculation Spray Pump 1-RS-P-1A, Failure to Rotate by Hand
05000280/LER-1981-031-03, /03L-0:on 810508,amp Reading for Heat Tracing Panel 11,circuit 1B,found Below Acceptance Criteria.Caused by Mechanical Damage to Tape.Heat Tracing Replaced & Tested. Design Change Initiated
05000280/LER-1982-034-03, /03L-0:on 820625,cabinet 2AC Control Rods Would Not Respond to Demand Signal.Caused by Blown Fuse & Failed Phase Control Rod in Power Cabinet.Failed Components Replaced & Rods Succesfully Tested
05000280/LER-1981-025-03, /03L-0:on 810414,penetrant Test PT-27B Showed Low Amp Readings for Heat Tracing Panels 10 & 11,circuit 6A. Caused by Excessive Heat.Design Change Initiated
05000281/LER-1981-018-03, /03L-0:on 810318,amp Readings for Heat Tracing Panel 10,circuit 4A,were Below Acceptance Criteria Per PT-27.Caused by Excessive Heat.Defective Heat Tracing Replaced & Tested
05000281/LER-1981-030-03, /03L-0:on 810504,emergency Diesel Generator Output Breaker Opened on Overspeed.Caused by Misaligned Overspeed Trip Limit Switch.Limit Switch Adjusted & Generator Tested Satisfactorily
05000281/LER-1981-004-03, /03L-0:on 810107,reactor Trip Breaker a Failed to Open.Caused by Sporadic Failure of Under Voltage Device Due to Missing Bushing.Under Voltage Device Replaced
05000281/LER-1980-049-03, /03L-0:on 801231,electrical Penetration E-4 Through Fire Wall Between Equipment Rooms 2 & 3 Turbine Basement Found Open.Caused by Fire Stop Removed to Accomodate Welding Lead.Fire Stop Repaired
05000281/LER-1981-009-03, /03L-0:on 810105,PT-27A Revealed Loss of Heat Tracing for Panel 11 Circuit 4C.Caused by Short in Heat Tape.Defective Heat Tracing Replaced.Design Change Initiated
05000281/LER-1980-038-03, /03L-0:on 801105,on-svc Boric Acid Storage Tank & Boron Injection Tank Concentration Found Less That 11.5%. Caused by Improper Valve Lineup.Boric Acid Concentration Increased
05000281/LER-1981-016-03, /03L-0:on 810119,at 100% Power,Positive Pressure Greater than 0.05 Inches Water Could Not Be Maintained in Control Room.Caused by Deteriorated Seals on Door to Control Room Complex.Defective Doors Repaired
05000280/LER-1980-074-03, /03L-0:on 801218,power Leads to MOV-1867A & C Discovered to Have Been Reversed.Cause Undetermined.Power Leads Returned to Normal & Valves Tested
05000280/LER-1980-037-03, While Performing Periodic Test 26.1,radiation Monitor RM-SV-111 Found Inoperative. Caused by Spare Lug Short Causing Erroneous Indications. Lug Removed.Monitor Returned to Svc
05000281/LER-1981-002-03, /03L-0:on 810105,PT-27A Revealed Loss of Heat Tracing for Panel 10 Circuits 1A & 1B & Panel 11 Circuit 4A. Caused by Open Heating Elements.Defective Heat Tracing Tape Replaced
05000281/LER-1980-003-03, MOV-CW-200B Found Inoperable.Caused by Electrical Malfunction Due to Mechanical Repair in Progress.Redundant Water Box Inlet Valve MOV-CW-206B Was Shut
05000280/LER-1980-013-03, Valve HCV-1852A to Tank 1-SI-TK-1A Delayed Closing 30-50 Secs,Resulting in Tank Draining Below Tech Spec Level.Caused by Moisture in Air Lines Feeding Valve Operator.Tank Filled to Tech Spec Level
05000281/LER-1981-001-03, /03L-0:on 810102,one Boric Acid Flow Path to Core Inoperable.Caused by Personnel Inadvertently Closing Valve 2-CH-226.Flow Path Restored & Personnel Reinstructed
05000280/LER-1980-044-03, /03L-0:on 800707,during Periodic Test 22.2, Circuit Breaker for 1-EE-P-1F Found Open.Caused by Personnel Error.Breaker Reclosed
05000280/LER-1980-033-03, /03L-0:on 801024,w/unit at 100% Power,Positive Pressure of Greater That 0.05 Inches of Water Could Not Be Maintained in Control Room.Caused by Deterioration of Door Seals.Defective Doors Repaired
05000281/LER-1980-021-03, /03L-0:on 800826,while Attempting to Pressurize Accumulator B Using Normal Nitrogen Supply,Pressure Fell Below Allowable Limits.Caused by Leak & Low Pressure in Nitrogen Fill Header.Added Pressure to Sys & Repaired Leak
05000280/LER-1980-068-03, /03L-0:on 800923,radiation Monitoring Sampling Pumps 1-SW-P-5C & D Were Found to Be Inoperable.Caused by Corroded Pump Impeller & Seals.Pumps Will Be Removed,Tested & Inspected Prior to Startup
05000280/LER-1980-042-03, /03L-0:on 800805,pump for Drawing Radiation Samples from Process Vent Sys Froze & Triggered Low Flow Alarm.Caused by Moisture Condensation in Pump Area.Pump Pulled & Replaced
05000281/LER-1980-022-03, /03L-0:on 800826,w/unit Operating at Steady State, Channel III Flow Computer,For Steam Generator Steam Flow Fc 2474,failed.Caused by Loose Printed Circuit Board & Cold Solder Joint on Filter Capacitor.Board & Capacitor Repai
05000281/LER-1981-011-03, /03L-0:on 810119,fire Watch Not Maintained While Fuel Oil Pumphouse Carbon Dioxide Sys Out of Svc for Design Change Mods.Caused by Personnel Leaving Post.Fire Watch re-established & Personnel Disciplined
05000281/LER-1980-008-03, /03L-0:on 800623,while Performing Periodic Test 26.1,found Air Ejector Monitor Alarm Setpoint Above Tech Spec Requirement.Caused by Instrument Drift.Alarm Setpoint Recalibr
05000280/LER-1980-047-03, /03L-0:on 801205,discrepancies Discovered in Documenting Performance of Periodic Tests PT-24.5B,18.4, 17.2 & 17.3.Caused by Operations Personnel Oversight. Personnel Reinstructed & Improved Mgt of Periodic Testing
05000281/LER-1980-006-03, /03L-0:on 800527,contrary to Tech Spec 3.1.G.2.b. (1),Containment 2 Pressurizer Level Exceeded 33% W/O Mitigation Protection.Caused by Addition of Water to Primary Sys to Maintain Level Indication.Rcs Drained
05000281/LER-1980-019-03, /03L-0:on 800822,during Operation Trip Valve TV- SS-206B Would Not Stay Closed When Actuated from Control Room.Caused by Misadjusted Limit Switch.Valve Isolated & Position Limit Switch Readjusted
05000281/LER-1980-028-03, /03L-0:on 800926,w/unit at 100% Power,Reduction in Svc Water Pressure to Charging Pumps Experienced.Caused by Missing Valve Disk for Check Valve 2-SW-112.Valve Replaced
05000281/LER-1980-015-03, /03L-0:on 800816,after Pressurization of Accumulator Tanks,Level Indicator for B SI Accumulator Indicated 61% Level,Above Tech Spec Max of 58.3%.Caused by Condensation & High Pressure in Nitrogen Feed Line
05000280/LER-1980-003-03, /03L-0:on 800107,during Prestartup Testing, Feedwater Bypass Valve HCV-FW-155B Did Not Fail Closed Upon Loss of Instrument Air as Per Design.Caused by Sticking, Dirty Pilot Valve.Valve Cleaned & Returned to Svc
05000280/LER-1979-043-03, /03L-0:on 791220,during Cold Shutdown,Radiation Recorder RR-175 Stopped Printing.Caused by Control String Disengaging from Drive Wheel.String Replaced
05000280/LER-1979-039-03, /03L-0:on 791214,during Normal Operation,Boric Acid Transfer Pump Strip Heater 2B on Heat Tracing Circuit 26A Failed.Caused by Water Damage to Heat Tracing Circuit. Replaced Strip Heater & Repaired Boric Acid Leak
05000280/LER-1979-028-03, /03L-0:on 791003,concluded That Ten of 209 Anchor Bolts Inspected Failed to Meet Acceptance Criteria.Caused by Improper Installation.Deficiencies Corrected as Required
05000280/LER-1979-007-03, /03L-0 on 790320:w/unit Shutdown,Visual Insp Resulted in Declaring One Snubber Inoperable Because of Low Fluid Level.Caused by Leakage from Reservoir Fill Fitting. Snubber Removed & Rebuilt
05000280/LER-1979-018-01, /01T-0 on 790509:solenoid Valve Model 8320A102 Mfg by Automatic Switch Co Found Environmentally Unqualified & Reportable Per IE Bulletin 79-01 & Tech Specs.Valve Could Fail to Control Admission & Venting of Air During LOCA
05000280/LER-1979-003-03, /03L-0 on 790124:error Detected in Calibr Procedures for Steam Flow Instrumentation.Caused by Error Made When Calibr Procedures Changed
05000281/LER-1978-033-03, /03X-1 on 780926:circulating Water Outlet Valve MOV-CW-200D Failed to Close When Operated Electrically. Caused When Actuator Cam for Shut Torque Switch Became Wedged Against Torque Switch Hold Down Screw
05000281/LER-1979-005-03, /03L-0 on 790204:at Cold Shutdown,Valve MOV-SW-203C Failed to Cycle Electrically.Caused by Slighting Bent Clutch Shaft in Valve Operation.Part Dismantled & Overhauled
05000281/LER-1979-004-03, /03L-0 on 790204:setpoints of Seven Main Steam Safety Valves Not within Tech Spec Limits.Caused by Normal Setpoint Drift
05000280/LER-1978-039-03, /03L-0 on 781115:during Normal Oper,Channel I of Pressurizer Level Instrumentation LI-1-459,drifted Low.Cause Unknown at This Time.Transmitter Recalibr
05000280/LER-1979-013-03, /03L-0 on 790410:100 Gallons Released from Boron Recovery Test Tank 1-BR-TK-2B Prior to Obtaining Sample Results.Caused by Improper Valve Lineup for Tank Recirculation in Preparation for Sampling
05000281/LER-1979-006-03, /03L-0 on 790204:at Cold Shutdown,Valve MOV-SW-203D Failed to Operate Electrically During Functional Test.Caused by Mechanical Binding of Valve.Valve Bearing Was Replaced
05000281/LER-1978-037-03, /03L-0 on 781022:with Unit at Rated Pwr,Panel Indicator for Radiat Monitor RM-213 Monitoring a Steam Generator Blowdown Read 0.Caused by Loose Connector Joining Detector Cable to Electronic Chassis
05000280/LER-1978-045-03, /03L-0 on 781205:radiation recorder,RR-175,stopped Printing.Caused by Frozen Bushing in Print Mechanism
05000281/LER-1978-011-03, /03X-1 on 780305:During Normal Full Pwr Oper,There Was No Svc Water Flow Thru Charging Pump Intermediate Seal Cooler 2-SW-E-1B,due to Failure of the Coolers Discharge Gate Valve
05000280/LER-1978-040-03, /03L-0 on 781031:periodic Test to Inspec EDGs During a Refueling Outage Had Not Been Completed for EDGs 1 & 3.Caused by Admin Error.Admin Guidelines Have Been Rev
05000280/LER-1978-033-03, /03L-0 on 781015:heat Tracing Circuit Failed. Caused by Old Boric Acid Buildup & Penetration of Heat Leakage
05000281/LER-1978-036-03, /03L-0 on 781015:compensatory Surveillance on RCP Cstator & Hearing Temp Had Not Been Performed.Caused by Failure of Operating Personnel to Restore Process Computer Trend Block Following Computer Reinitialization
05000280/LER-1978-032-03, /03L-0 on 781011:heat Tracing Circuit Faults Had Occurred as a Result of Boric Acid Incursion.Faults Repaired & Circuit Current Verified
05000280/LER-1978-043-03, /03L-0 on 781129:low Temp Alarm & Rapid Increase in Level Were Noted in Boric Acid Storage Tank a During Valve Line Up to Transfer Boric Acid from Storage Tank B to A.Caused by Erroneous Opening of 1-CH-74
05000281/LER-1978-032-03, /03L-0:on 780921,heat Tracing Circuit Manual Boration/Boric acid-to-blender Failed.Caused by Boric Acid Penetration of Heat Tracing Tape Circuits.Heat Tracing Tape Replaced
05000280/LER-1978-048-03, /03L-0 on 781209:2 Control Rod Assemblies Dropped During Rod Urgent Failure Alarm Investigation.Caused by a Faulty Phase Control Circuit Card in the Rod Control Power Cabinet
05000280/LER-1980-061-03, /03L-0:on 800904,release valve,HCV-LW-104A,was Not Closed as Required & 3% of a Liquid Waste Test Tank Was Released Before Release Rate Had Been Determined.Caused by Operator Error
05000280/LER-1983-046-03, /03L-0:on 831008,heat Tracing Panel 2A1 Found Deenergized.Caused by Damaged Heat Tape & Resistance Temp Device (RTD) on Circuit Resulting in Breaker Overload.Heat Tracing & RTD Replaced
05000280/LER-1983-023-03, /03L-0:on 830513,steam Generator Blowdown Released to Discharge Canal W/O Monitor.Caused by Procedures Not Requiring Flow Verification in Radiation Monitor. Blowdown Checklist Will Be Modified
05000281/LER-1983-023-03, /03L-0:on 830511,PT 27B Revealed Amp Readings for Heat Tracing Panel 9,circuit 28A,below Acceptance Criteria. Caused by Boric Acid Buildup on Heat Tape,Corroding Terminals & Resulting in Open Circuit.Heat Tracing Replaced
05000280/LER-1982-018-03, /03L-0:on 820121,PT-27 Revealed Amp Readings for Heat Tracing Panels 8 & 9,circuit 13A,below Acceptable Criteria.Caused by Excessive Heat.Defective Heat Tracing Replaced & Tested
05000281/LER-1983-027-03, /03L-0:on 830523,PT-27C Revealed That Amp Reading for Heat Tracing Panel 8,circuit 22A Below Tech Spec Limit. Caused by Excessive Heat.Heat Tracing Replaced.Design Change initiated.W/830620
05000280/LER-1983-027-03, /03L-0:on 830615,intermediate Range High Flux Trip Setpoint Found Nonconservative During Review of Cycle 7 & Cycle 8 Data.Caused by Improper Assessment of Effect of New Core Design on Instrumentation