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	Issue date	Title	Topic
ML093620602	16 February 1979	LER 79-003/03L-0 on 790120:during Normal Operation,Signal from One of Two Low Level Alarm Devices for Refueling Water Tank Became Erratic,Making Alarm Inoperable.Caused by Freezing of Sensing Line for Level Instrument Controller
ML19249B487	30 August 1979	LER 79-008/03L-0:on 790803,while Operating at 75% Power,Svc Water Pump 36 Was Smoking at Shaft Packing Gland Area.Caused by Wearing of Line Shafts & Bearings Under Normal Loads.Svc Water Pump Was Replaced
ML19259D693	12 October 1979	LER 79-022/03L-0:on 790913,amount of Water in Condensate Storage Tank Was 60,000 Gallons Below Tech Spec Requirement. Caused by Efforts to Reduce High Sodium Concentration in Hot Well
ML19261B854	2 March 1979	LER 79-002/03L-0 on 790205:at 100% Power,Increase in Gaseous Activity Was Observed.Caused by Leakage of No 32 Charging Pump Plunger.Plunger & Packing for Union Pump QX-300 Quintuplex Were Replaced & Unit Returned to Svc
ML19269D146	16 February 1979	LER 79-004/03L-0 on 790126:during Normal Operation,Process Radiation Monitors R-11 & R-12 Became Inoperable Due to Seized Sample Pump.Caused by Seizure of Conde Dry Air Pump, Model 6SFCW,for Process Radiation Monitors R-11 & R-12
ML19269D559	26 September 1978	LER 78-025/03L-0 on 780831:excessive Noise from Svc Water Pump 35 Observed at 90% Power.Main Pump Shaft Broken, Disabling One of Three Header Pumps.Caused by Bearing Failures.Pump Secured & Header Redirected
ML19269D565	17 November 1978	LER 78-034/03L-0 on 781027:increase in Plant Vent Radio Gas Monitor Observed.Caused by Leakage of Charging Pump Plunger 31.Plunger & Packaging for Union Pump QX-300 Quintuplex Replaced.Plunger Returned to Operable Status
ML19277C591	26 June 1983	LER 83-024/03L-0:on 830527,during Normal Operation,Boron Injection Tank Level Channel 944F Became Inoperable.Caused by Erroneous Level Indication Due to Solidification of Boric Acid in Instrument Line.Affected Line cleared.W/830626 Ltr	Boric Acid
ML19282B674	12 March 1979	LER 79-001/03L-0 on 790211:high Dew Point & Air Leakage on Breaker 2-6 Noted.To Preclude Breaker Damage,Breaker 2-6 Was Opened.Caused by Apparent Gasket Leak in Westinghouse C-A Breaker.Feeder & Breaker Repaired
ML19289F121	9 June 1979	LER 78-020/04T-0 on 780428:activity of Water Sample Taken from Camp Field Reservoir on 780327 Exceeded 10 Times Historical Level.Caused by non-representative Sampling Technique & Adverse Meteorological Conditions
ML19350E683	12 June 1981	LER 81-014/03L-0:on 810517,one Sensing Device Found Not Operating on Level Transmitters LT-940 & LT-941.Caused by Foreign Matl Buildup on Instrument Stalks of Gem Level Transmitters.Matl Removed & Transmitter Tested
ML20004E188	22 May 1981	LER 81-012/01T-0:on 810511,3/4-inch Swagelok Union in Remote Reactor Head Vent Line Parted During Test to Assure Operability of Low Power Injection/Rhr Check Valves Prior to Restart.Caused by Improper Installation.Valve Closed
ML20004E929	3 June 1981	LER 81-013/01T-0:on 810520,low Flow from Two Motor Driven Auxiliary Boiler Feed Pumps at Hot Shutdown Discovered During Surveillance Testing.Caused by New Trim in Generator Level Control Valves Restricting Auxiliary Feedwater Flow
ML20004F374	22 May 1981	LER 81-011/01T-0:on 810508,pits Observed on Exterior Surface of Svc Water Pump Discharge Piping.Caused by External Corrosion,Resulting in Local Areas Below Min Wall Thickness. Areas Sand Blasted,Patch Welded & Repainted
ML20004F634	12 June 1981	LER 81-015/03L-0:on 810528,during Low Power Operation, Control Room Instrumentation Indicated Control Rod in Inserted Position.Cause Undetermined.Control Rod Returned to Bank Position.Subsequent Tests Satisfactory
ML20009H544	30 July 1981	LER 81-017/03L-0:on 810630,feed Breaker for 480-volt Bus 5A Opened & Associated Lockout Relay Actuated.Caused by Defective Westinghouse DB-75 Breaker Tripping Device. Device Replaced
ML20010B332	4 August 1981	LER 81-016/03L-0:on 810705,during Routine Check of Diesel Generator 23,water Found in Crankcase.Caused by Water Leaking from Lube Oil Cooler Into Lube Oil.Leaking Tube Plugged & Oil Changed
ML20010C617	10 August 1981	LER 81-018/03L-0:on 810710,during Attempt to Automatically Start,Diesel Generator 21 Shut Down.Caused by Over Crank Due to Incorrectly Set Timer Relays.Relays Reset
ML20010G016	3 September 1981	LER 81-006/03L-0:on 810706,battery Charger 32 Discovered in Tripped Position.Caused by Faulty delta-P Air Flow Sensing Switch.Switch Replaced
ML20010H753	14 September 1981	LER 81-021/99X-0:on 810829,pinhole Leak Discovered in Elbow on 2-inch Svc Water Outlet Line.Caused by Erosion of Pipe Matl.Elbow & Pipe Replaced
ML20011A677	16 October 1981	LER 81-022/03L-0:on 810916,during Normal Operation W/Reactor at 100% Power,Lubricating Oil of Diesel Generator 21 Had Unusual Appearance.Caused by Leaking Water Into Lube Oil. Cooler Tube Bundle Replaced & Generator Returned to Svc
ML20024A346	21 May 1983	LER 83-014/03L-0:on 830421,charging Pump 21 Developed Leak & Declared Inoperable.Caused by Defective Head Gasket on Cylinder Head 4.Gasket Replaced
ML20024A379	22 May 1983	LER 83-017/03L-0:on 830422,leak Observed in Isolation Valve Seal Water Sys.Caused by Damage to 3/8-inch Stainless Steel Weld Connection FW10016.Weld repaired.W/830522 Ltr
ML20024A383	22 May 1983	LER 83-021/03L-0:on 830422,analysis Revealed Adsorption Efficiency for Methyl Iodine of 82.2%.Cause Under Investigation.Charcoal Filters replaced.W/830522 Ltr
ML20024A384	27 May 1983	LER 83-015/03L-0:on 830427,shutdown Initiated When Containment Spray Pump 21 Did Not Meet Operability Criteria. Repairs Not Completed within Allowable Time Period.Caused by High Vibrations.Pump replaced.W/830527 Ltr
ML20024A420	22 May 1983	LER 83-019/03L-0:on 830422,valve 743,nonautomatic Containment Isolation Valves in RHR Pump Miniflow Line Would Not Operate.Cause Not Stated.Reach Rods Disconnected & Valve Stem & Universal Joints Cleaned & lubricated.W/830522 Ltr
ML20024A456	20 May 1983	LER 83-020/03L-0:on 830420,high Steam Flow Bistable FC449A Setpoint Found Higher than Tech Spec Limit.Caused by Defective Internal Dc Power Supply Board.Board Replaced & Bistable Reset
ML20024A517	22 May 1983	LER 83-016/03L-0:on 830422,boron Injection Tank Level Channel 944F Became Inoperable.Caused by Erroneous Level Indication Due to Boric Acid Solidification in Instrument Impulse Line.Affected Impulse Line cleaned.W/830522 Ltr	Boric Acid
ML20024A524	20 May 1983	LER 83-013/03L-0:on 830420,during Surveillance Testing of Containment Isolation Valves,Valve 1702 Did Not Fully Close. Cause Not Stated.Shaft & Inside of Actuator Cleaned.Air Motor Diaphragm Replaced as Preventive measure.W/830520 Ltr
ML20024A529	22 May 1983	LER 83-018/03L-0:on 830422,plant Shutdown Commenced When Binding of Valve 1870 Could Not Be Corrected within Tech Spec Time Period.Cause Not Stated.Binding Alleviated by Lubricating Valve Stem & Universal joints.W/830522 Ltr
ML20024A535	19 May 1983	LER 83-012/03L-0:on 830419,reactor Cavity Continuous Sump Level Monitor LI-3302 Indicated Above 20-ft,but Independent Cavity Level Alarm Did Not Annunciate.Reactor Cavity Found Dry.Caused by Instrument drift.W/830519 Ltr
ML20024E793	19 August 1983	LER 83-029/03L-0:on 830720,analysis of Central Control Room Air Filtration Sys Charcoal Filters Indicated Absorption Efficiencies for methyl-iodine of 92.9% & 95%.Cause of Inefficiencies Unknown.Charcoal replaced.W/830819 Ltr
ML20027B907	16 September 1982	LER 82-037/99X-0:on 820902,svc Water Leak Identified on Reactor Containment Fan Cooler Unit 22.Cause Under Investigation.Leakage Will Be Closely Monitored & Failed Tubes Examined During Upcoming Refueling Outage
ML20038B814	24 November 1981	LER 81-026/03L-0:on 811029,reduction Observed in Delta & Average Temp on Loop 23.Caused by Defect in Hot Leg Model 176JA Resistance Temp Detector Circuit.Resistance Temp Element Replaced
ML20039B158	10 December 1981	LER 81-009/03L-0:on 811110,battery Charger 31 Tripped.Cause Not specified.Delta-P Air Flow Sensing Switch Replaced
ML20039B597	10 December 1981	LER 81-027/03L-0:on 811110,primary Heat Trace Circuit for Balance Leakoff Line of Safety Injection Pump 23 Failed. Caused by Burned & Broken Connection at Chromalox Strip Heater Element for Thrust Balance Line
ML20039D894	22 December 1981	LER 81-010/01T-0:on 811208,leak of Approx 1 Pint Per Minute Identified in Fan Cooler Unit 34.Caused by Leak in Tube of Cooling Coils for Motor Cooler.Tube Repaired
ML20039D900	21 December 1981	LER 81-030/99X-0:on 811111,seal Return Flow from RCP Increased to Greater than 5 Gpm.Caused by anti-rotation Pin Failure or Seal Failure.New Seals & Pin of Modified Design Installed
ML20039D908	21 December 1981	LER 81-028/03L-0:on 811120,pressurizer Safety Valve PCV-464 Found to Actuate Approx 4% Below Tech Spec Min.Cause Unknown.Valve Readjusted & Retested
ML20039D912	21 December 1981	LER 81-029/03L-0:on 811119,during Test Run of Safety Injection Pump,Motor Emitted Smoke & Did Not Turn.Caused by Frozen Shaft Bushings on Pump Rotating Elements.Pump Replaced
ML20040D677	18 January 1982	LER 81-033/03L-0:on 811217,containment Air Lock Type B Test PT-SA 10 Was Performed 7 Days Late.Cause Not Stated. Followup Sys Revised to Preclude Recurrence
ML20040E420	21 January 1982	LER 81-032/03L-0:on 811222,during Testing,Containment Isolation Valve 1723 Found Binding in Midstroke Position. Caused by Binding of Mechanical Linkage Between Grinnell Diaphragm Valve.Linkage Lubricated
ML20040E431	21 January 1982	LER 81-031/03L-0:on 811223,during Surveillance Test PT-MI/PC-MI at 100% Power,Value for Q (Upper) on Channel N44 Was Found Incorrect.Caused by Transcription Error.Channel Recalibr & Retested Satisfactorily
ML20041A605	5 February 1982	LER 82-001/03L-0:on 820106,steam Generator 23 Level Channel 437B Was Found Drifting in High Level Direction.Caused by Blockage in Impulse Lines to Foxboro Level Transmitter 437B. Lines Blown Out
ML20041B232	9 February 1982	LER 82-002/03L-0:on 820110,during Full Power Operation,Weld Channel & Penetration Pressurization Sys Air Consumption Exceeded Tech Spec Limits.Caused by Excessive Seat Leakage in Fischer Valve 1192.Valve Removed & Seat Replaced
ML20041D614	18 February 1982	LER 82-003/03L-0:on 820119,containment Fan Cooler Condensate Flow Monitoring Sys Failed to Operate.Caused by Dry Air Pump,Model 6 Sfcw for Process Radiation Monitors R-11 & 12. Pump Replaced & Returned to Svc
ML20041E202	24 February 1982	Updated LER 81-003/03L-1:on 810119,during Surveillance Test PT-R35 Shutoff Valve 822B in Component Cooling Water Return Line 21 for RHR Heat Exchange Would Not Open.Caused by Loose Torque Switch.Switch Tightened
ML20041E206	24 February 1982	Updated LER 81-004/03L-1:on 810119,during Surveillance Test PT-R35 Opening Time for One of Two Power Operated Relief Valves (PCV-456) Was 2.5-s Longer than Permitted.Caused by Nitrogen Supply Valve Inadvertently Closed.Valve Reopened
ML20041E395	24 February 1982	LER 82-004/03L-0:on 820125,charging Pump 22 Declared Inoperable Due to Excessive Plunger Seal Leakage.Caused by Normal Wear.Seal Packing Replaced
ML20042A246	8 March 1982	LER 82-005/03L-0:on 820206,main Steam Isolation Valve Dwg 20728-B for Loop 23 Failed to Close During Isolation of Secondary Plant for Maint.Caused by Insufficient Packing Lubrication.Packing Lubricated & Valve Stroked

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