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| Issue date | Title | Topic | |
|---|---|---|---|
| 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 | |
| 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 |
| 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 | |
| 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 | |
| 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 | |
| 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 |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| ML20052B863 | 19 April 1982 | LER 82-014/03L-0:on 820320,valve 267A Found Leaking.Two Boric Acid Transfer Pumps & Boric Acid Storage Sys Isolated in Order to Isolate Valve for Repairs.Caused by Diaphragm Failure.Valve Repaired | Boric Acid |
| ML20050D525 | 26 March 1982 | LER 82-008/03L-0:on 820224,during Routine Insp,Three Lines in Rack 15 of Weld Channel & Containment Penetration Sys Were Isolated.Cause Not Stated.Affected Lines Promptly Returned to Svc & Sys Checked to Assure Proper line-ups | |
| ML20050C082 | 24 March 1982 | LER 82-010/01T-0:on 820310,determined That Existing Operating Procedures Required Necessary Safeguards Equipment to Be Operable Prior to Bringing Reactor Critical But Did Not Establish Specific Requirements in Hot Shutdown | |
| ML20050B343 | 23 March 1982 | LER 82-013/03L-0:on 820221,during Normal Operational Testing,Number 23 Svc Water Pump Indicated Vibration of 4.6 Mils.Caused by High Vibration in Pump Gland Seal Area. Packing & Latern Ring Removed,Inspected & Pump Repacked | |
| ML20050B314 | 19 March 1982 | LER 82-007/03L-0:on 820217,during Visual Insp of Number 21 Battery Cell,Number 31 Cell Found Leaking & Exhibiting Low Electrolyte Level.Caused by Cell Casing Crack Due to Expansion of Positive Plates.Cell Replaced | |
| ML20050B299 | 19 March 1982 | LER 82-009/01T-0:on 820305,during Power Operation,Nitrogen Pressure Reduction Required Corrective Measures to Prevent Operation in Manner Less Conservative than Assumed in Fsar. Caused by Malfunction of Nitrogen Regulator Valves | Boric Acid |
| ML20042A683 | 9 March 1982 | LER 82-006/03L-0:on 820207,power Range Nuclear Instrumentation Channel N 43 Indicated High & Then Became Erratic.Cause Not Given.Channel Returned to Normal During Operation.Instrumentation to Be Closely Monitored | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| ML20049A807 | 21 September 1981 | LER 81-020/03L-0:on 810821,during Normal Operation,Control Rod G-3 Dropped Into Core,Initiating Turbine Runback.Caused by Spray from Leaking Plug Needle Valve on Control Rod H-2, Causing Coil Stack Connector to Fault.Connector Repaired | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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 |