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| Issue date | Title | Topic | |
|---|---|---|---|
| 05000000/LER-1950-237, Updated LER 50-237/01L:on 760406,unacceptable Ultrasonic Indication Found on Isolation Condenser safe-end.Caused by Cracks in safe-ends.Cracked safe-end Removed & Sent to Bmcl for Metallographic Analysis | 13 July 1976 | Updated LER 50-237/01L:on 760406,unacceptable Ultrasonic Indication Found on Isolation Condenser safe-end.Caused by Cracks in safe-ends.Cracked safe-end Removed & Sent to Bmcl for Metallographic Analysis | |
| 05000280/LER-1975-006, Supplemental LER 75-06/010:on 750215,module S/N D401 Failed Due to Capacitor C-37 Being Open Circuit.Capacitors Replaced | 4 April 1975 | Supplemental LER 75-06/010:on 750215,module S/N D401 Failed Due to Capacitor C-37 Being Open Circuit.Capacitors Replaced | |
| 05000280/LER-1975-008, Supplementary LER 75-08/01L on 750427.Previously Described Event Caused by Apparent Inadequate Implementation of Administrative Controls During Const & Preoperation. Administrative Control of Electrical Wire Changes Increased | 7 July 1975 | Supplementary LER 75-08/01L on 750427.Previously Described Event Caused by Apparent Inadequate Implementation of Administrative Controls During Const & Preoperation. Administrative Control of Electrical Wire Changes Increased | |
| 05000280/LER-1975-011, Suppl to LER 75-11/01T:on 750416,pinhole Leak Developed in Recirculation Line on Charging Pump 2-CH-P-1C Causing Ventilation Vent Sampler RMS-VG-109 to Alarm.Leak Found & Isolated | 10 July 1975 | Suppl to LER 75-11/01T:on 750416,pinhole Leak Developed in Recirculation Line on Charging Pump 2-CH-P-1C Causing Ventilation Vent Sampler RMS-VG-109 to Alarm.Leak Found & Isolated | |
| 05000280/LER-1975-015, Updated LER 75-15/01T:on 750803,leaking Fitting on Overhead Gas Compressor B Resulted in Unplanned Release of Radioctive Matl from Site.Caused by Loose Fitting.Leaking Fitting Repaired | 3 September 1975 | Updated LER 75-15/01T:on 750803,leaking Fitting on Overhead Gas Compressor B Resulted in Unplanned Release of Radioctive Matl from Site.Caused by Loose Fitting.Leaking Fitting Repaired | |
| 05000280/LER-1975-016, Updated LER 75-16/010:on 750822 & 23,channel II Protection Drifted in Nonconservative Direction.Caused by Moisture Accumulation Between Senson Insulation & Copper Lead Wire. All RTDs Replaced W/Improved Versions | 2 February 1976 | Updated LER 75-16/010:on 750822 & 23,channel II Protection Drifted in Nonconservative Direction.Caused by Moisture Accumulation Between Senson Insulation & Copper Lead Wire. All RTDs Replaced W/Improved Versions | |
| 05000280/LER-1976-002, Updated LER 76-02/01T:on 760313,determined Worst Break LOCA Core Thermal Transient Analysis Inaccurate Since Effects of Steam Generator Tube Plugging on LOCA Not Considered | 17 May 1976 | Updated LER 76-02/01T:on 760313,determined Worst Break LOCA Core Thermal Transient Analysis Inaccurate Since Effects of Steam Generator Tube Plugging on LOCA Not Considered | |
| 05000280/LER-1976-002, Updated LER 76-02/01T:on 760313,determined Worst Break LOCA Core Thermal Transient Analysis Inaccurate Since Effects of Steam Generator Tube Plugging on LOCA Not Considered. W/760525 Ltr | 17 May 1976 | Updated LER 76-02/01T:on 760313,determined Worst Break LOCA Core Thermal Transient Analysis Inaccurate Since Effects of Steam Generator Tube Plugging on LOCA Not Considered. W/760525 Ltr | |
| 05000280/LER-1977-012, RO S1-77-01 Re Failures of Hydraulic Shock Supports (Snubbers).Extent of Failures Reported in LER 77-12.All Snubbers Operable on 771207 Startup | 5 January 1978 | RO S1-77-01 Re Failures of Hydraulic Shock Supports (Snubbers).Extent of Failures Reported in LER 77-12.All Snubbers Operable on 771207 Startup | |
| 05000280/LER-1979-045, Updated LER 79-045/01X-1:on 791228,air Would Not Flow Through Filters If Consequence Limiting Safeguards hi-hi Signal Removed from Control Circuit of Safeguards Area Exhaust Ventilation Dampers.Caused by Design Deficiency | 15 July 1982 | Updated LER 79-045/01X-1:on 791228,air Would Not Flow Through Filters If Consequence Limiting Safeguards hi-hi Signal Removed from Control Circuit of Safeguards Area Exhaust Ventilation Dampers.Caused by Design Deficiency | |
| 05000280/LER-1980-059, Updated LER 80-059/01X-1:on 801016,util Informed of Potential for Loss of Auxiliary Feedwater Flow Following Steamline Rupture.Caused by Original Design Allowing Pump Runout & Subsequent Tripping of Sys Pump Motors | 15 July 1982 | Updated LER 80-059/01X-1:on 801016,util Informed of Potential for Loss of Auxiliary Feedwater Flow Following Steamline Rupture.Caused by Original Design Allowing Pump Runout & Subsequent Tripping of Sys Pump Motors | |
| 05000280/LER-1981-047, Updated LER 81-047/03X-1:on 810910,following Reactor Trip & While Returning to Power,Specific Activity of RCS Indicated Dose Equivalent I-131 Level Greater than Tech Spec Limit. Caused by Fuel Element Defect in Reactor Core | 3 August 1982 | Updated LER 81-047/03X-1:on 810910,following Reactor Trip & While Returning to Power,Specific Activity of RCS Indicated Dose Equivalent I-131 Level Greater than Tech Spec Limit. Caused by Fuel Element Defect in Reactor Core | |
| 05000280/LER-1981-081, /03L-0:on 820121,during Research for LER 81-081/03L-0,found That Original Vacuum Pumps Were Replaced W/Pumps That Failed to Meet Required Seismic Qualifications. Study of Present Pumps Completed.Assistance Request Issued | 19 February 1982 | /03L-0:on 820121,during Research for LER 81-081/03L-0,found That Original Vacuum Pumps Were Replaced W/Pumps That Failed to Meet Required Seismic Qualifications. Study of Present Pumps Completed.Assistance Request Issued | Design basis earthquake |
| 05000280/LER-1982-024 | 8 June 1982 | LER 82-024/01T-0:on 820524,weld Leak on a Steam Generator Channel Head Drain Piping at 2-RC-159 Identified During RCS Integrity Test PT-11.Caused by Random Defect in Root Weld, Possibly Due to Split Pass | Liquid penetrant |
| 05000280/LER-1982-025 | 28 May 1982 | LER 82-025/03L:on 820509,control Room Operator Overfilled B Accumulator Beyond Upper Tech Spec Limit.Caused by Operator error.HCV-2852B Opened to Drain Accumulator Tank to Tech Spec Limits | |
| 05000280/LER-1982-026 | 9 July 1982 | LER 82-026/03L-0:on 820618,electrical Penetration Found Improperly Sealed.Caused by Personnel Failure to Restore Penetration to Original State Following Cable Installation. Penetration Sealed | Fire Barrier Fire Watch |
| 05000280/LER-1982-027 | 8 June 1982 | LER 82-027/03L-0:on 820513,performance of PT 27B Revealed Amp Readings for Heat Tracing Panels 8 & 9,circuit 21A,below Acceptance Criteria.Caused by Excessive Heat.Defective Heat Tracing Replaced | Boric Acid |
| 05000280/LER-1982-028 | 11 June 1982 | LER 82-028/03L-0:on 820513,both Charging Pump Svc Water pumps,2-SW-10A & 10B,lost Suction.Caused by Clogged Suction Line Strainer Due to Marine Growth & Increased Use of Svc Water by Chillers | |
| 05000280/LER-1982-029 | 14 June 1982 | LER 82-029/03L-0:on 820518,during Periodic Test 2-PT-39B-2 Snubbers 2-RC-HSS-162 & 163 Found to Have Empty Remote Reservoir.Caused by Damaged O Ring on Common Valve Block. O Ring Replaced | Earthquake |
| 05000280/LER-1982-032 | 28 June 1982 | LER 82-032/03L-0:on 820531,pressure in Nitrogen Bottle Supplying Emergency Air to PCV-MS-202A & B Found Below Tech Spec Limit.Caused by Fitting Leaks in Air Lines.Fittings Tightened & Pressurized Bottle Installed | |
| 05000280/LER-1982-035 | 2 July 1982 | LER 82-035/03L-0:on 820607,w/unit at Full power,TV-IA-201A Would Not Remain Closed After High Radiation Test Signal Cleared.Caused by Incomplete Valve Contact Due to Loosened Limit Switch Mounting Plate.Plate Secured | |
| 05000280/LER-1982-036 | 9 July 1982 | LER 82-036/03L-0:on 820611,motor Operated Valve CS-203C Failed to Close During Performance of PT-17.1.Caused by Loose Field Wiring Disconnect Device at Motor Control Ctr Cubicle.Plug Reinserted & Valve Returned to Svc | |
| 05000280/LER-1982-049, Updated LER 82-049/03X-1:on 820419,at 100% Power,Charging Pump Svc Water Pump 1-SW-P 10B Found W/Zero Discharge Pressure.Caused by Loss of Suction to Pumps Due to Increased Use of Svc Water by Chillers.Pump Operation Restored | 3 August 1982 | Updated LER 82-049/03X-1:on 820419,at 100% Power,Charging Pump Svc Water Pump 1-SW-P 10B Found W/Zero Discharge Pressure.Caused by Loss of Suction to Pumps Due to Increased Use of Svc Water by Chillers.Pump Operation Restored | |
| 05000280/LER-1982-055 | 28 May 1982 | LER 82-055/03L-0:on 820429,MDP 21.3 Revealed That Control Room Envelope Might Not Meet Tech Spec Requirements.Caused by Leak in Door Seals & Improper Exterior Ventilation Lineup.Seals Replaced & Lineup Corrected | |
| 05000280/LER-1982-057 | 8 June 1982 | LER 82-057/03L-0:on 820515,review of I-131 Spike History Revealed That Deviation Repts Not Submitted for 820106 & 0325 post-reactor Trip Specific Activity Samples of RCS W/Dose Equivalent I-131 Higher than Tech Specs | |
| 05000280/LER-1982-058 | 8 June 1982 | LER 82-058/03L-0:on 820516,T-26.1 Revealed Component Cooling Sys Radiation Monitor RM-CC-105 Reading Above Alarm Setpoint But Not Alarming.Caused by Out of Calibr Alarm & Oscillator Cards.Cards Calibr | |
| 05000280/LER-1982-059 | 14 June 1982 | LER 82-059/03L-0:on 820517,during Recorder Pen Check,Pen on FR-GW-100 (Process Vent) Did Not Correspond to Actual Process Vent Flow Per Tech Spec.Caused by Seized Recorder Motor Bearing Due to Lack of Lubrication.Bearing Replaced | |
| 05000280/LER-1982-060 | 11 June 1982 | LER 82-060/03L-0:on 820514,charging Pump Svc Water Pump 1-SW-P-10A Found to Have 0 Discharge Pressure Due to Loss of Suction.Caused by Increased Use of Svc Water by Chillers.One Control Room Chiller Secured | |
| 05000280/LER-1982-061 | 2 July 1982 | LER 82-061/03L-0:on 820606,w/unit at 100% Power,Core Cooling Monitor a Showed Erratic Indication & Was Removed from Svc. Caused by Failed Printed Circuit Board.Board Replaced | |
| 05000280/LER-1982-062 | 14 June 1982 | LER 82-062/03L-0:on 820520,PT-27 Revealed Low Ampere Readings for Circuit 7A in Panels 8 & 9,contrary to Tech Spec.Caused by Damaged Tapes.Tapes Replaced | Boric Acid |
| 05000280/LER-1982-063 | 28 May 1982 | LER 82-063/03L:on 820330,circuit Breakers for Heat Tracing Panels 8 & 9,circuits 7,found Inoperable.Caused by Mechanical Failure in One Breaker.Defective Breaker Replaced & Other Circuit Breaker Reset | Boric Acid |
| 05000280/LER-1982-065 | 2 July 1982 | LER 82-065/03L-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-1982-066 | 28 June 1982 | LER 82-066/03L-0:on 820602,steam Driven Auxiliary Feed Pump Started Automatically Due to Failure of Time Delay Relay Coil.Caused by Open Circuit in Coil.Defective Relay Replaced | |
| 05000280/LER-1982-068 | 14 July 1982 | LER 82-068/03L-0:on 820614,fire Detection Sys Discovered to Have Lost Program,Rendering Sys Inoperable.Probably Caused by Voltage Spike in Sys Resulting in Loss of Program.Sys Reprogrammed & Verified Operational | |
| 05000280/LER-1982-070 | 28 June 1982 | LER 82-070/03L-0:on 820604,containment Spray Pump 1-CS-P-1A Failed to Start During Performance Testing 17.1.Caused by Pump Motor Breaker.Breaker Replaced & Pump Tested Satisfactorily | |
| 05000280/LER-1982-071 | 16 July 1982 | LER 82-071/03L-0:on 820618,motor Operated valve-1536 Pressure Power Operated Relief Block Valve Was Cycled Open But Failed to Close Fully,Remotely or Manually.Cause Undetermined.Valve Closed Electrically | |
| 05000280/LER-1982-073 | 16 July 1982 | LER 82-073/03L-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-1982-074 | 9 July 1982 | LER 82-074/03L-0:on 820618,following Check of Svc Water Piping,Pump 1-SW-P-10B Failed to Auto Start.Caused by Drift of Low Pressure Setpoint of Pressure Switch PS-SW-105.Switch Replaced | |
| 05000280/LER-1982-084, Updated LER 82-084/01X-1:on 820808,venting of a Charging Pump Resulted in Max Instantaneous Release Rate Being Exceeded.Caused by Failure to Change Radiation Monitor Setpoint Alarms to Reflect New Vent Sys Flow Rates | 27 September 1982 | Updated LER 82-084/01X-1:on 820808,venting of a Charging Pump Resulted in Max Instantaneous Release Rate Being Exceeded.Caused by Failure to Change Radiation Monitor Setpoint Alarms to Reflect New Vent Sys Flow Rates | |
| 05000280/LER-1982-126, Updated LER 82-126/03X-1:on 821223,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 | 8 February 1983 | Updated LER 82-126/03X-1:on 821223,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-1975-005, Updated LER 75-05/010:on 750225,radial Trip of Max 2.5% Existed.Caused by Prolonged Recovery of Rod F-2.Control Room Alarm Did Not Function Due to Defective Circuit Card. Card Replaced & Staff Cautioned | 8 April 1975 | Updated LER 75-05/010:on 750225,radial Trip of Max 2.5% Existed.Caused by Prolonged Recovery of Rod F-2.Control Room Alarm Did Not Function Due to Defective Circuit Card. Card Replaced & Staff Cautioned | |
| 05000281/LER-1975-012, Suppl to LER 75-12/01T:on 750706,reactor Trip Occurred. Caused by Sudden Closure of Trip Valve in Main Steam Line B Followed by Closure of Main Steam Line Valves a & C | 20 January 1976 | Suppl to LER 75-12/01T:on 750706,reactor Trip Occurred. Caused by Sudden Closure of Trip Valve in Main Steam Line B Followed by Closure of Main Steam Line Valves a & C | |
| 05000281/LER-1976-003, Updated LER 76-03/01T:on 760521,routine Chemistry Analysis of Primary Coolant Boron Concentration Indicated Unplanned Dilution Occurred.Caused by Three Tubes Cut on Steam Generator 2A.Tubes Plugged | 27 July 1976 | Updated LER 76-03/01T:on 760521,routine Chemistry Analysis of Primary Coolant Boron Concentration Indicated Unplanned Dilution Occurred.Caused by Three Tubes Cut on Steam Generator 2A.Tubes Plugged | Shutdown Margin |
| 05000281/LER-1976-015, Updated LER 76-15/03L:on 761006,leakage of Water Observed from Recirculation Spray HX a Piping.Caused by Cracking in Heat Affected Zones of Several Welds.Listed Piping Will Be Replaced | 19 November 1976 | Updated LER 76-15/03L:on 761006,leakage of Water Observed from Recirculation Spray HX a Piping.Caused by Cracking in Heat Affected Zones of Several Welds.Listed Piping Will Be Replaced | |
| 05000281/LER-1980-010, Updated LER 80-010/01X-1:on 800721,containment Gaseous & Particulate Radiation Monitor Found to Have One Automatic Function Incapable of Operating During Fuel Movement.Caused by Bypass of Containment Exhaust Fan Relay in Design | 13 August 1982 | Updated LER 80-010/01X-1:on 800721,containment Gaseous & Particulate Radiation Monitor Found to Have One Automatic Function Incapable of Operating During Fuel Movement.Caused by Bypass of Containment Exhaust Fan Relay in Design Change | |
| 05000281/LER-1981-052, Updated LER 81-052/03X-1:on 810815,valve MOV-SW-202A Failed to Close Due to Grounded Motor.Grounding Caused by Flooding in Sump.Motor Replaced | 31 January 1983 | Updated LER 81-052/03X-1:on 810815,valve MOV-SW-202A Failed to Close Due to Grounded Motor.Grounding Caused by Flooding in Sump.Motor Replaced | |
| 05000281/LER-1981-074, Updated LER 81-074/03X-1:on 811120,higher than Normal Activity Detected in Storm Drain Sys.Caused by Leaks from Stripper Feed Steam Heater Due to Failure of Heater Drain Receiver & Pumps to Prevent Overflow.Tubes Plugged | 31 January 1983 | Updated LER 81-074/03X-1:on 811120,higher than Normal Activity Detected in Storm Drain Sys.Caused by Leaks from Stripper Feed Steam Heater Due to Failure of Heater Drain Receiver & Pumps to Prevent Overflow.Tubes Plugged | |
| 05000281/LER-1992-001, Corrected Page 3 to LER 92-001-00 Re 920130 Mechanical Failure Due to Oil Leak from Charging Pump a Bearing & Damper Remaining Closed on Charging Pump B | 26 March 1992 | Corrected Page 3 to LER 92-001-00 Re 920130 Mechanical Failure Due to Oil Leak from Charging Pump a Bearing & Damper Remaining Closed on Charging Pump B | |
| IA-86-542, Requests Authorization to Issue Initial License for Dry Cask Storage of Spent Fuel Per 10CFR72 in Isfsi.License Should Be Granted | 6 June 1986 | Requests Authorization to Issue Initial License for Dry Cask Storage of Spent Fuel Per 10CFR72 in Isfsi.License Should Be Granted | High winds Offsite Dose Calculation Manual Tornado Missile Tornado Generated Missile Design basis earthquake Earthquake Turbine Missile Fuel cladding |
| ML17054D432 | 28 May 1982 | Valcor Valves & Gordos Limit Switches. | Safe Shutdown High winds Anticipated operational occurrence Earthquake Turbine Missile |