| | | Reporting criterion |
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| 05000247/LER-1981-003-03, 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 | 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 | |
| 05000286/LER-1981-003-03, /03L-1:on 810223,during Seismic Restraint Test, Snubber RC-R-344-5-H Failed to Lock Up in Extension Position.Caused by Excessively High Bleed Rate W/Result That Lockup Was Unobservable.Snubber Rebuilt & Tested | /03L-1:on 810223,during Seismic Restraint Test, Snubber RC-R-344-5-H Failed to Lock Up in Extension Position.Caused by Excessively High Bleed Rate W/Result That Lockup Was Unobservable.Snubber Rebuilt & Tested | |
| 05000286/LER-1981-003, Forwards LER 81-003/03L-1 | Forwards LER 81-003/03L-1 | |
| 05000247/LER-1981-004-03, 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 | 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 | |
| 05000286/LER-1981-005, Forwards LER 81-005/03L-1.Detailed Event Analysis Encl | Forwards LER 81-005/03L-1.Detailed Event Analysis Encl | |
| 05000286/LER-1981-005-03, /03L-1:on 810305,snubber RC-R-70-8-H Was Declared Inoperable Because of Oil Leak.Caused by Failure of O-ring in Main Cylinder Flange & Scoring on Extension & Compression Poppets.Snubber Repaired,Rebuilt & Tested | /03L-1:on 810305,snubber RC-R-70-8-H Was Declared Inoperable Because of Oil Leak.Caused by Failure of O-ring in Main Cylinder Flange & Scoring on Extension & Compression Poppets.Snubber Repaired,Rebuilt & Tested | |
| 05000286/LER-1981-006, Forwards LER 81-006/03L-0 | Forwards LER 81-006/03L-0 | |
| 05000286/LER-1981-006-03, /03L-0:on 810706,battery Charger 32 Discovered in Tripped Position.Caused by Faulty delta-P Air Flow Sensing Switch.Switch Replaced | /03L-0:on 810706,battery Charger 32 Discovered in Tripped Position.Caused by Faulty delta-P Air Flow Sensing Switch.Switch Replaced | |
| 05000286/LER-1981-007-01, /01T-0:on 810928,following Hydrostatic Testing of Rcs,Leakage of Coolant Observed in Steam Generator 31.Cause Not Specified.Unit in Cold Shutdown.Eddy Current Insp of Steam Generators Underway | /01T-0:on 810928,following Hydrostatic Testing of Rcs,Leakage of Coolant Observed in Steam Generator 31.Cause Not Specified.Unit in Cold Shutdown.Eddy Current Insp of Steam Generators Underway | |
| 05000286/LER-1981-007, Forwards LER 81-007/01T-0.Detailed Event Analysis Encl | Forwards LER 81-007/01T-0.Detailed Event Analysis Encl | |
| 05000286/LER-1981-008, Forwards LER 81-008/01T-0.Detailed Event Analysis Encl | Forwards LER 81-008/01T-0.Detailed Event Analysis Encl | |
| 05000286/LER-1981-008-01, /01T-0:on 811109,at Hot Shutdown,Two Manual Isolation Vlaves in Weld Channel & Containment Penetration Pressurizaiton Sys Were Closed.Caused by Administrative Error.Valves Opened | /01T-0:on 811109,at Hot Shutdown,Two Manual Isolation Vlaves in Weld Channel & Containment Penetration Pressurizaiton Sys Were Closed.Caused by Administrative Error.Valves Opened | |
| 05000286/LER-1981-009-03, /03L-0:on 811110,battery Charger 31 Tripped.Cause Not specified.Delta-P Air Flow Sensing Switch Replaced | /03L-0:on 811110,battery Charger 31 Tripped.Cause Not specified.Delta-P Air Flow Sensing Switch Replaced | |
| 05000286/LER-1981-009, Forwards LER 81-009/03L-0 | Forwards LER 81-009/03L-0 | |
| 05000286/LER-1981-010, Forwards LER 81-010/01T-0 | Forwards LER 81-010/01T-0 | |
| 05000286/LER-1981-010-01, /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 | /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 | |
| 05000247/LER-1981-011-01, /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 | /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 | |
| 05000247/LER-1981-011, Forwards LER 81-011/01T-0 | Forwards LER 81-011/01T-0 | |
| 05000247/LER-1981-012, Forwards LER 81-012/01T-0 | Forwards LER 81-012/01T-0 | |
| 05000247/LER-1981-012-01, /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 | /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 | |
| 05000247/LER-1981-013-01, /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 | /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 | |
| 05000247/LER-1981-013, Forwards LER 81-013/01T-0 | Forwards LER 81-013/01T-0 | |
| 05000247/LER-1981-014, Forwards LER 81-014/03L-0 | Forwards LER 81-014/03L-0 | |
| 05000247/LER-1981-014-03, /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 | /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 | |
| 05000247/LER-1981-015-01, /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 | /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 | |
| 05000247/LER-1981-015, Forwards LER 81-015/03L-0 | Forwards LER 81-015/03L-0 | |
| 05000247/LER-1981-016, Forwards LER 81-016/03L-0 | Forwards LER 81-016/03L-0 | |
| 05000247/LER-1981-016-03, /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 | /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 | |
| 05000247/LER-1981-017-03, /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 | /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 | |
| 05000247/LER-1981-017, Forwards LER 81-017/03L-0 | Forwards LER 81-017/03L-0 | |
| 05000247/LER-1981-018-03, /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 | /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 | |
| 05000247/LER-1981-018, Forwards LER 81-018/03L-0 | Forwards LER 81-018/03L-0 | |
| 05000247/LER-1981-019-03, /03L-0:on 810810,safety Injection Pump 23 Tripped After Flash & Smoke Observed in Pump Motor.Caused by Two Rotor Bars Lifting,Making Contact W/Stator Windings & Rubbing Through Insulation.Motor Replaced | /03L-0:on 810810,safety Injection Pump 23 Tripped After Flash & Smoke Observed in Pump Motor.Caused by Two Rotor Bars Lifting,Making Contact W/Stator Windings & Rubbing Through Insulation.Motor Replaced | |
| 05000247/LER-1981-019, Forwards LER 81-019/03L-0 | Forwards LER 81-019/03L-0 | |
| 05000247/LER-1981-020, Forwards LER 81-020/03L-0 | Forwards LER 81-020/03L-0 | |
| 05000247/LER-1981-020-03, /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 Repaire | /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 | |
| 05000247/LER-1981-021-99, /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 | /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 | |
| 05000247/LER-1981-021, Forwards LER 81-021/99X-0 | Forwards LER 81-021/99X-0 | |
| 05000247/LER-1981-022, Forwards LER 81-022/03L-0 | Forwards LER 81-022/03L-0 | |
| 05000247/LER-1981-022-03, /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 | /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 | |
| 05000247/LER-1981-023-03, /03L-0:on 811014,perturbation in Secondary Blowdown Piping Associated W/Steam Generator 21 Resulted in Failure of Bolts Between Strut Assembly & Base of Snubber 46-SR-3.Cause Due to Water Hammer.Bolts & Snubber Replaced | /03L-0:on 811014,perturbation in Secondary Blowdown Piping Associated W/Steam Generator 21 Resulted in Failure of Bolts Between Strut Assembly & Base of Snubber 46-SR-3.Cause Due to Water Hammer.Bolts & Snubber Replaced | |
| 05000247/LER-1981-024-03, /03L-0:on 811014,snubber 70-SR-13 on Pressurizer Relief Line & Bergen Patterson Hydraulic Snubber Hssa 3 Shaft Found Broken.Caused by Transverse Impact Load on Snubber Piston Rod.Snubber Replaced & Rod Analyzed | /03L-0:on 811014,snubber 70-SR-13 on Pressurizer Relief Line & Bergen Patterson Hydraulic Snubber Hssa 3 Shaft Found Broken.Caused by Transverse Impact Load on Snubber Piston Rod.Snubber Replaced & Rod Analyzed | |
| 05000247/LER-1981-025, Forwards LER 81-025/99X-0 | Forwards LER 81-025/99X-0 | |
| 05000247/LER-1981-025-99, /99X-0:on 811009,code Safety Valve Ms 48A on Main Steam Line 21 Was Found Lifting at Lower than Specified Pressure.Caused by Broken Section on Disc Holder in Valve. Defective Parts Replaced | /99X-0:on 811009,code Safety Valve Ms 48A on Main Steam Line 21 Was Found Lifting at Lower than Specified Pressure.Caused by Broken Section on Disc Holder in Valve. Defective Parts Replaced | |
| 05000247/LER-1981-026, Forwards LER 81-026/03L-0 | Forwards LER 81-026/03L-0 | |
| 05000247/LER-1981-026-03, /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 | /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 | |
| 05000247/LER-1981-027-03, /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 | /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 | |
| 05000247/LER-1981-027, Forwards LER 81-027/03L-0 | Forwards LER 81-027/03L-0 | |
| 05000247/LER-1981-028-03, /03L-0:on 811120,pressurizer Safety Valve PCV-464 Found to Actuate Approx 4% Below Tech Spec Min.Cause Unknown.Valve Readjusted & Retested | /03L-0:on 811120,pressurizer Safety Valve PCV-464 Found to Actuate Approx 4% Below Tech Spec Min.Cause Unknown.Valve Readjusted & Retested | |
| 05000247/LER-1981-029-03, /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 | /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 | |