| | | Reporting criterion |
|---|
| 05000293/LER-1981-001, Forwards LER 81-001/03L-0 | Forwards LER 81-001/03L-0 | |
| 05000293/LER-1981-001-03, /03L-0:on 801226,unidentified Drywell Leakage Measured at Rate Contrary to Tech Specs.Cause Not Known Excessive Leakage Eliminated by Backstating B Recirculation Pump Suction Valve Mo 202-4B & Discharge Valve Mo 202-5B | /03L-0:on 801226,unidentified Drywell Leakage Measured at Rate Contrary to Tech Specs.Cause Not Known Excessive Leakage Eliminated by Backstating B Recirculation Pump Suction Valve Mo 202-4B & Discharge Valve Mo 202-5B | |
| 05000293/LER-1981-002-03, /03L-0:on 810107,main Stack Sample Flow Alarm Received Twice on Panel C903 in Control Room.Caused by Frozen Suction Line (First Occurrence) & Blown Power Supply Fuse (Second Occurrence) | /03L-0:on 810107,main Stack Sample Flow Alarm Received Twice on Panel C903 in Control Room.Caused by Frozen Suction Line (First Occurrence) & Blown Power Supply Fuse (Second Occurrence) | |
| 05000293/LER-1981-002, Forwards LER 81-002/03L-0 | Forwards LER 81-002/03L-0 | |
| 05000293/LER-1981-003, Forwards LER 81-003/03L-0 | Forwards LER 81-003/03L-0 | |
| 05000293/LER-1981-003-03, /03L-0:on 810123,heat Detector Failed in Diesel Generator a Room.Detector Alarm Could Not Be Reset.Cause Not Stated.Jumper Added to Eliminate Alarm on Control Room Panel C-114 Until Sys Repaired.Detector Replaced & Jumper Re | /03L-0:on 810123,heat Detector Failed in Diesel Generator a Room.Detector Alarm Could Not Be Reset.Cause Not Stated.Jumper Added to Eliminate Alarm on Control Room Panel C-114 Until Sys Repaired.Detector Replaced & Jumper Removed | |
| 05000293/LER-1981-004, Forwards LER 81-004/01T-0 | Forwards LER 81-004/01T-0 | |
| 05000293/LER-1981-004-01, /01T-0:on 810225,review Indicated That If Backup Scram Solenoids Failed,Actuation of ATWS Sys Would Prevent Closure of Scram Discharge Vol Vent & Drain Valves,Violating Primary Containment.Cause Due to Oversight in Design | /01T-0:on 810225,review Indicated That If Backup Scram Solenoids Failed,Actuation of ATWS Sys Would Prevent Closure of Scram Discharge Vol Vent & Drain Valves,Violating Primary Containment.Cause Due to Oversight in Design | |
| 05000293/LER-1981-005, Forwards LER 81-005/03L-0 | Forwards LER 81-005/03L-0 | |
| 05000293/LER-1981-005-03, /03L-0:on 810202,unidentified Reactor Drywell Coolant Leakage Rates Measured Above Tech Spec Level.Cause Not Stated.Recirculation Pump Suction Valves a & B & Discharge Valves Backseated | /03L-0:on 810202,unidentified Reactor Drywell Coolant Leakage Rates Measured Above Tech Spec Level.Cause Not Stated.Recirculation Pump Suction Valves a & B & Discharge Valves Backseated | |
| 05000293/LER-1981-006-01, /01X-0:on 810219,review of Alleged Omission in Scheduling of 11 Once Per Cycle Instrumentation Verified Oversight.Caused by Misinterpretation of Special Circumstances Which Must Be Applied to Testing Definition | /01X-0:on 810219,review of Alleged Omission in Scheduling of 11 Once Per Cycle Instrumentation Verified Oversight.Caused by Misinterpretation of Special Circumstances Which Must Be Applied to Testing Definition | |
| 05000293/LER-1981-007-03, /03L-0:on 810217,reactor Coolant Leak Detection Air Sampling Sys Declared Inoperable.Caused by Blown Fuses. Fuses Replaced.Pump Will Be Rebuilt | /03L-0:on 810217,reactor Coolant Leak Detection Air Sampling Sys Declared Inoperable.Caused by Blown Fuses. Fuses Replaced.Pump Will Be Rebuilt | |
| 05000293/LER-1981-007, Forwards LER 81-007/03L-0 | Forwards LER 81-007/03L-0 | |
| 05000293/LER-1981-008, Forwards LER 81-008/03L-0 | Forwards LER 81-008/03L-0 | |
| 05000293/LER-1981-008-03, /03L-0:on 810313,inboard Isolation Valve Mo 2301-5 Was Determined to Be Inoperable.Caused by Manual Operation Disengagement Spring in Limitorque Operator Being Broken & Imbedded in Operator Gear Teeth,Jamming Gears | /03L-0:on 810313,inboard Isolation Valve Mo 2301-5 Was Determined to Be Inoperable.Caused by Manual Operation Disengagement Spring in Limitorque Operator Being Broken & Imbedded in Operator Gear Teeth,Jamming Gears | |
| 05000293/LER-1981-009-03, Inboard Isolation Valve Failed to Open & HPCI Sys Declared Inoperable.Caused by Incorrect Min Torque Switch Setting of Motor Operator & Thermal Binding.Torque Switch Set at Max Value | Inboard Isolation Valve Failed to Open & HPCI Sys Declared Inoperable.Caused by Incorrect Min Torque Switch Setting of Motor Operator & Thermal Binding.Torque Switch Set at Max Value | |
| 05000293/LER-1981-010, Forwards LER 81-010/04T-0 | Forwards LER 81-010/04T-0 | |
| 05000293/LER-1981-010-04, /04T-0:on 810407,rept Received Indicating Excessive Co-60 Concentration in Mussel Sample Taken from Discharge Canal.Cause Not Stated.Dose Insignificant When Compared to Natural Background Dose | /04T-0:on 810407,rept Received Indicating Excessive Co-60 Concentration in Mussel Sample Taken from Discharge Canal.Cause Not Stated.Dose Insignificant When Compared to Natural Background Dose | |
| 05000293/LER-1981-011, Forwards LER 81-011/03L-0 | Forwards LER 81-011/03L-0 | |
| 05000293/LER-1981-011-03, /03L-0:on 810402,recirculation Pump B Motor Generator Set Tripped Resulting in Drive Motor Trip & Generator Lockout Alarms Sounding.Cause Not Determined.Set Returned to Svc | /03L-0:on 810402,recirculation Pump B Motor Generator Set Tripped Resulting in Drive Motor Trip & Generator Lockout Alarms Sounding.Cause Not Determined.Set Returned to Svc | |
| 05000293/LER-1981-012, Forwards LER 81-012/03L-0 | Forwards LER 81-012/03L-0 | |
| 05000293/LER-1981-012-03, /03L-0:on 810403,4 Kv Breaker A507,feeding Core Spray Pump P215A,inadvertently Closed During Routine Keep Fill Checks on Low Pressure ECCS Sys.Caused by Inconsistency in Automatic & Close/Trip Sequence Timings | /03L-0:on 810403,4 Kv Breaker A507,feeding Core Spray Pump P215A,inadvertently Closed During Routine Keep Fill Checks on Low Pressure ECCS Sys.Caused by Inconsistency in Automatic & Close/Trip Sequence Timings | |
| 05000293/LER-1981-013, Forwards LER 81-013/04T-0 | Forwards LER 81-013/04T-0 | |
| 05000293/LER-1981-013-04, /04T-0:on 810430,rept Received from Yankee Atomic Lab Re High Concentration of Co-60 in Irish Moss Sample Taken on 810218.Probably Caused by Fallout from Recent Atmospheric Weapons Tests | /04T-0:on 810430,rept Received from Yankee Atomic Lab Re High Concentration of Co-60 in Irish Moss Sample Taken on 810218.Probably Caused by Fallout from Recent Atmospheric Weapons Tests | |
| 05000293/LER-1981-014-03, /03L-0:on 810414,pressure Instrument 261-39B Indicating Needle Went Beyond Mechanical Stop.Caused by Technician Error.Instrument Repaired.Technician Instructed | /03L-0:on 810414,pressure Instrument 261-39B Indicating Needle Went Beyond Mechanical Stop.Caused by Technician Error.Instrument Repaired.Technician Instructed | |
| 05000293/LER-1981-014, Forwards LER 81-014/03L-0 | Forwards LER 81-014/03L-0 | |
| 05000293/LER-1981-015-03, During Surveillance Testing,Nozzle on 23-ft Level Cardox Sys Hose Reel Failed to Deliver Adequate Stream.Caused by Operator Error.Fire Brigade Training Revised | During Surveillance Testing,Nozzle on 23-ft Level Cardox Sys Hose Reel Failed to Deliver Adequate Stream.Caused by Operator Error.Fire Brigade Training Revised | |
| 05000293/LER-1981-016-03, /03L-0:on 810430,reactor Core Isolation Cooling Valve Mo 1301-17 Failed to Close on Demand Following Switch Actuation.Caused by Deteriorated Packing Jammed Between Valve Stem & Packing Gland.Packing Replaced | /03L-0:on 810430,reactor Core Isolation Cooling Valve Mo 1301-17 Failed to Close on Demand Following Switch Actuation.Caused by Deteriorated Packing Jammed Between Valve Stem & Packing Gland.Packing Replaced | |
| 05000293/LER-1981-016, Forwards LER 81-016/03L-0 | Forwards LER 81-016/03L-0 | |
| 05000293/LER-1981-017-03, /03L-0:on 810503,refuel Floor Exhaust Radiation Monitor 1705-8A Failed Downscale.Caused by Drop in High Voltage Output Due to Failed Capacitor in High Voltage Power Supply Circuit.Capacitor Replaced | /03L-0:on 810503,refuel Floor Exhaust Radiation Monitor 1705-8A Failed Downscale.Caused by Drop in High Voltage Output Due to Failed Capacitor in High Voltage Power Supply Circuit.Capacitor Replaced | |
| 05000293/LER-1981-017, Forwards LER 81-017/03L-0 | Forwards LER 81-017/03L-0 | |
| 05000293/LER-1981-018, Forwards Updated LER 81-018/03X-1 | Forwards Updated LER 81-018/03X-1 | |
| 05000293/LER-1981-018-03, Stack Gas Radiation Monitor 1705-18A Was Downscale & Inoperable Following Lightning Strike Near Main Stack.Caused by Voltage Surge Resulting in Preamplifier & Discriminator Circuits Failure | Stack Gas Radiation Monitor 1705-18A Was Downscale & Inoperable Following Lightning Strike Near Main Stack.Caused by Voltage Surge Resulting in Preamplifier & Discriminator Circuits Failure | |
| 05000293/LER-1981-019-03, /03L-0:on 810514,level Recorder 5049 Was Found Indicating High.Caused by Calibr Shift Due to Jarring Instrument Sensing Lines During Installation of Torus Room Staging.Recorder & Transmitters Recalibr | /03L-0:on 810514,level Recorder 5049 Was Found Indicating High.Caused by Calibr Shift Due to Jarring Instrument Sensing Lines During Installation of Torus Room Staging.Recorder & Transmitters Recalibr | |
| 05000293/LER-1981-019, Forwards LER 81-019/03L-0 | Forwards LER 81-019/03L-0 | |
| 05000293/LER-1981-020, Forwards LER 81-020/03L-0 | Forwards LER 81-020/03L-0 | |
| 05000293/LER-1981-020-03, /03L-0:on 810603,fire Protection Engineer Determined That 810224 Fire on 51-ft Elevation,Initially Reviewed Per Orc Meeting 81-39,should Be Reported.Caused by Failure to Follow Combustible Matl Removal Procedures | /03L-0:on 810603,fire Protection Engineer Determined That 810224 Fire on 51-ft Elevation,Initially Reviewed Per Orc Meeting 81-39,should Be Reported.Caused by Failure to Follow Combustible Matl Removal Procedures | |
| 05000293/LER-1981-021, Forwards LER 81-021/01T-0 | Forwards LER 81-021/01T-0 | |
| 05000293/LER-1981-021-01, /01T-0:on 810615,review of Analysis Responding to 10CFR50.44 Determined Inadequate.Mgt Controls Failed to Identify Effect of Rendering post-accident Nitrogen Supply Sys Inoperable.Caused by Inadequate Mgt Controls | /01T-0:on 810615,review of Analysis Responding to 10CFR50.44 Determined Inadequate.Mgt Controls Failed to Identify Effect of Rendering post-accident Nitrogen Supply Sys Inoperable.Caused by Inadequate Mgt Controls | |
| 05000293/LER-1981-022-03, /03L-0:on 810519,reactor Coolant Leak Detection Air Sampling Sys C-19 Pump Motor Overheated & Blew Fuses. Cause Under Investigation | /03L-0:on 810519,reactor Coolant Leak Detection Air Sampling Sys C-19 Pump Motor Overheated & Blew Fuses. Cause Under Investigation | |
| 05000293/LER-1981-022, Forwards LER 81-022/03L-0 | Forwards LER 81-022/03L-0 | |
| 05000293/LER-1981-023-03, /03L-0:on 810601 & 800721,two Primary Containment Nitrogen Supply Valves Made Inoperable & Valve in Same Line Placed in Isolated Condition.Caused by Lines Cut & Capped Due to Maint on post-accident Nitrogen Supply Sys | /03L-0:on 810601 & 800721,two Primary Containment Nitrogen Supply Valves Made Inoperable & Valve in Same Line Placed in Isolated Condition.Caused by Lines Cut & Capped Due to Maint on post-accident Nitrogen Supply Sys | |
| 05000293/LER-1981-023, Forwards LER 81-023/03L-0 | Forwards LER 81-023/03L-0 | |
| 05000293/LER-1981-024-03, /03L-0:on 810604,shutdown Transformer Primary & Secondary Breakers Opened Due to Fault in Offsite Power Supply.Caused by Failure of Cable Porcelain Clamps.Clamps removed.Post-type Insulators Installed | /03L-0:on 810604,shutdown Transformer Primary & Secondary Breakers Opened Due to Fault in Offsite Power Supply.Caused by Failure of Cable Porcelain Clamps.Clamps removed.Post-type Insulators Installed | |
| 05000293/LER-1981-024, Forwards LER 81-024/03L-0 | Forwards LER 81-024/03L-0 | |
| 05000293/LER-1981-025-03, /03L-0:on 810607,technician Failed to Document Jumper Installation.Caused by Shift Turnover During Installation.Personnel Instructed to Remain W/Job Until Completion,Regardless of Shift Times | /03L-0:on 810607,technician Failed to Document Jumper Installation.Caused by Shift Turnover During Installation.Personnel Instructed to Remain W/Job Until Completion,Regardless of Shift Times | |
| 05000293/LER-1981-025, Forwards LER 81-025/03L-0 | Forwards LER 81-025/03L-0 | |
| 05000293/LER-1981-026-01, /01X-0:on 810707,during Engineering Analyses, Components of Standby Gas Treatment Sys Were Found to Have Insufficient Documentation to Demonstrate Operation During Loca.Documentation Acquired | /01X-0:on 810707,during Engineering Analyses, Components of Standby Gas Treatment Sys Were Found to Have Insufficient Documentation to Demonstrate Operation During Loca.Documentation Acquired | |
| 05000293/LER-1981-026, Forwards LER 81-026/01T-0 | Forwards LER 81-026/01T-0 | |
| 05000293/LER-1981-027-03, /03L-0:on 810616,while Performing Rod Block Monitor Surveillance Test 8.M.2.3.1,step 31 High Rod Block Came on at 123% Vs 94% Power.Caused by Failed Trip Ref Card. Card Replaced in Kind | /03L-0:on 810616,while Performing Rod Block Monitor Surveillance Test 8.M.2.3.1,step 31 High Rod Block Came on at 123% Vs 94% Power.Caused by Failed Trip Ref Card. Card Replaced in Kind | |