Pages that link to "05000373/LER-2015-001, Regarding Secondary Containment Inoperable Due to Interlock Doors Open"
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The following pages link to 05000373/LER-2015-001, Regarding Secondary Containment Inoperable Due to Interlock Doors Open:
Displayed 7 items.
- 05000373/LER-2015-001 (redirect page) (← links)
- ENS 50674 (← links)
- 05000373/LER-2001-001 (← links)
- 05000373/LER-1982-072, Forwards LER 82-072/03L-0 (← links)
- 05000373/LER-1982-041, Forwards LER 82-041/03L-0 (← links)
- 05000373/LER-1982-042, Forwards LER 82-042/03L-0 (← links)
- 05000373/LER-1982-039, Forwards LER 82-039/03L-0 (← links)
- 05000373/LER-1982-035, Forwards LER 82-035/03L-0 (← links)
- 05000373/LER-1982-036, Forwards LER 82-036/03L-0.Detailed Event Analysis Encl (← links)
- 05000373/LER-1982-034, Forwards LER 82-034/03L-0.Detailed Event Analysis Encl (← links)
- 05000373/LER-1982-026, Forwards LER 82-026/03L-0.Detailed Event Analysis Encl (← links)
- 05000373/LER-1982-023, Forwards LER 82-023/03L-0 (← links)
- 05000373/LER-1982-027, Forwards LER 82-027/03L-0 (← links)
- 05000373/LER-1982-038, Forwards LER 82-038/01T-0 (← links)
- 05000373/LER-1982-028, Forwards LER 82-028/03L-0 (← links)
- 05000373/LER-1982-030, Forwards LER 82-030/03L-0 (← links)
- 05000373/LER-1982-046, Forwards LER 82-046/01T-0 (← links)
- 05000373/LER-1982-033, Forwards LER 82-033/03L-0.Detailed Event Analysis Encl (← links)
- 05000373/LER-1982-032, Forwards LER 82-032/03L-0.Detailed Event Analysis Encl (← links)
- 05000373/LER-1982-043, Forwards LER 82-043/03L-0 (← links)
- 05000373/LER-1982-019, Forwards LER 82-019/03L-0 (← links)
- 05000373/LER-1982-022, Forwards LER 82-022/03L-0.Detailed Event Analysis Encl (← links)
- 05000373/LER-1982-024, Forwards LER 82-024/03L-0 (← links)
- 05000373/LER-1982-021, Forwards LER 82-021/03L-0 (← links)
- 05000373/LER-1982-031, Forwards LER 82-031/01T-0 (← links)
- 05000373/LER-1982-020, Forwards LER 82-020/03L-0.Detailed Event Analysis Encl (← links)
- 05000373/LER-1982-004, Forwards LER 82-004/03L-0 (← links)
- 05000373/LER-1982-014, Forwards LER 82-014/03L-0 (← links)
- 05000373/LER-1982-018, Forwards LER 82-018/03L-0 (← links)
- 05000373/LER-1982-015, Forwards LER 82-015/03L-0 (← links)
- 05000373/LER-1982-017, Forwards LER 82-017/03L-0 (← links)
- 05000373/LER-1982-012, Forwards LER 82-012/03L-0 (← links)
- 05000373/LER-1982-025, Updated LER 82-025/03X-1:on 820516 & 17,during Leak Rate Testing,Drywell Equipment Sump Pump Started & Pumped Down Sump.Caused by Control Switches for Valves 1RE024 & 25 Left in Auto Position Instead of Closed Position (← links)
- 05000373/LER-1982-121, Forwards LER 82-121/01T-0 (← links)
- 05000373/LER-1982-105, Forwards LER 82-105/03L-0 (← links)
- 05000373/LER-1982-111, Forwards LER 82-111/03L-0 (← links)
- 05000373/LER-1982-110, Forwards LER 82-110/03L-0 (← links)
- 05000373/LER-1982-099, Forwards LER 82-099/03L-0 (← links)
- 05000373/LER-1982-098, Forwards LER 82-098/03L-0 (← links)
- 05000373/LER-1982-097, Forwards LER 82-097/03L-0 (← links)
- 05000373/LER-1982-091, Forwards LER 82-091/03L-0 (← links)
- 05000373/LER-1982-087, Forwards LER 82-087/03L-0 (← links)
- 05000373/LER-1982-085, Forwards LER 82-085/03L-0 (← links)
- 05000373/LER-1982-084, Forwards LER 82-084/03L-0 (← links)
- 05000373/LER-1982-100, Forwards LER 82-100/03L-0 (← links)
- 05000373/LER-1982-107, Forwards LER 82-107/03L-0 (← links)
- 05000373/LER-1982-086, Forwards LER 82-086/03L-0 (← links)
- 05000373/LER-1982-081, Forwards LER 82-081/03L-0 (← links)
- 05000373/LER-1982-082, Forwards LER 82-082/03L-0 (← links)
- 05000373/LER-1982-049, Forwards LER 82-049/03L-0 (← links)
- 05000373/LER-1982-078, Forwards LER 82-078/03L-0 (← links)
- 05000373/LER-1982-073, Forwards LER 82-073/03L-0 (← links)
- 05000373/LER-1982-069, Forwards LER 82-069/03L-0 (← links)
- 05000373/LER-1982-066, Forwards LER 82-066/03L-0 (← links)
- 05000373/LER-1982-076, Forwards LER 82-076/03L-0 (← links)
- 05000373/LER-1982-077, Forwards LER 82-077/03L-0 (← links)
- 05000373/LER-1982-062, Forwards LER 82-062/03L-0 (← links)
- 05000373/LER-1982-044, Forwards LER 82-044/03L-0 (← links)
- 05000373/LER-1982-054, Forwards LER 82-054/03L-0 (← links)
- 05000373/LER-1982-037, Forwards LER 82-037/03L-0 (← links)
- 05000373/LER-1982-061, Forwards LER 82-061/03L-0 (← links)
- 05000373/LER-1982-064, Forwards LER 82-064/03L-0.Detailed Event Analysis Encl (← links)
- 05000373/LER-1982-068, Forwards LER 82-068/03L-0 (← links)
- 05000373/LER-1982-063, Forwards LER 82-063/03L-0 (← links)
- 05000373/LER-1982-083, Forwards LER 82-083/01T-0 (← links)
- 05000373/LER-1982-074, Forwards LER 82-074/03L-0 (← links)
- 05000373/LER-1982-060, Forwards LER 82-060/03L-0 (← links)
- 05000373/LER-1982-075, Forwards LER 82-075/03L-0 (← links)
- 05000373/LER-1982-057, Forwards LER 82-057/03L-0.Detailed Event Analysis Encl (← links)
- 05000373/LER-1983-007, Forwards LER 83-007/01T-0 (← links)
- 05000373/LER-1983-008, Forwards LER 83-008/03L-0 (← links)
- 05000373/LER-1983-004, Forwards LER 83-004/03L-0 (← links)
- 05000373/LER-1983-005, Forwards LER 83-005/01T-0 (← links)
- 05000373/LER-1983-002, Forwards LER 83-002/03L-0 (← links)
- 05000373/LER-1982-178, Forwards LER 82-178/03L-0 (← links)
- 05000373/LER-1982-176, Forwards LER 82-176/03L-0 (← links)
- 05000373/LER-1982-177, Forwards LER 82-177/03L-0 (← links)
- 05000373/LER-1982-155, Forwards LER 82-155/03L-0.Detailed Event Analysis Encl (← links)
- 05000373/LER-1982-150, Forwards LER 82-150/03L-0 (← links)
- 05000373/LER-1982-147, Forwards LER 82-147/03L-0 (← links)
- 05000373/LER-1982-148, Forwards LER 82-148/03L-0 (← links)
- 05000373/LER-1982-146, Forwards LER 82-146/03L-0 (← links)
- 05000373/LER-1982-145, Forwards LER 82-145/03L-0 (← links)
- 05000373/LER-1982-144, Forwards LER 82-144/03L-0 (← links)
- 05000373/LER-1982-143, Forwards LER 82-143/03L-0 (← links)
- 05000373/LER-1982-139, Forwards LER 82-139/03L-0 (← links)
- 05000373/LER-1982-140, Forwards LER 82-140/03L-0 (← links)
- 05000373/LER-1982-141, Forwards LER 82-141/03L-0 (← links)
- 05000373/LER-1982-142, Forwards LER 82-142/03L-0 (← links)
- 05000373/LER-1982-106, Forwards LER 82-106/03L-0 (← links)
- 05000373/LER-1982-108, Forwards LER 82-108/03L-0 (← links)
- 05000373/LER-1983-022, Forwards LER 83-022/03L-0 (← links)
- 05000373/LER-1983-025, Forwards LER 83-025/03L-0 (← links)
- 05000373/LER-1982-114, Forwards LER 82-114/01T-0 (← links)
- 05000373/LER-1982-102, Forwards LER 82-102/03L-0 (← links)
- 05000373/LER-1982-113, Forwards LER 82-113/03L-0 (← links)
- 05000373/LER-1982-103, Forwards LER 82-103/03L-0 (← links)
- 05000373/LER-1982-104, Forwards LER 82-104/03L-0 (← links)
- 05000373/LER-1983-014, Forwards LER 83-014/03L-0 (← links)
- 05000373/LER-1983-013, Forwards LER 83-013/03L-0 (← links)
- 05000373/LER-1983-011, Forwards LER 83-011/03L-0 (← links)
- 05000373/LER-1994-004, Forwards LER 94-004-00 Re Control Rod Position Indication Sys Failure on 940105.Although Event Occurred on 940105, Reportability Requirement Under 10CFR50.73 Not Recognized Until 940203 (← links)
- 05000373/LER-1982-137, Forwards LER 82-137/03L-0 (← links)
- 05000373/LER-1982-138, Forwards LER 82-138/03L-0 (← links)
- 05000373/LER-1982-127, Forwards LER 82-127/03L-0 (← links)
- 05000373/LER-1982-124, Forwards LER 82-124/03L-0.Detailed Event Analysis Encl (← links)
- 05000373/LER-1982-125, Forwards LER 82-125/03L-0 (← links)
- 05000373/LER-1982-128, Forwards LER 82-128/03L-0 (← links)
- 05000373/LER-1982-120, Forwards LER 82-120/03L-0 (← links)
- 05000373/LER-1982-117, Forwards LER 82-117/03L-0 (← links)
- 05000373/LER-1982-123, Forwards LER 82-123/03L-0 (← links)
- 05000373/LER-1982-115, Forwards LER 82-115/03L-0 (← links)
- 05000373/LER-1982-122, Forwards LER 82-122/03L-0 (← links)
- 05000373/LER-1982-133, Forwards LER 82-133/03L-0 (← links)
- 05000373/LER-1982-112, Forwards LER 82-112/03L-0 (← links)
- 05000373/LER-1983-003, Forwards LER 83-003/03L-0 (← links)
- 05000373/LER-1982-179, Forwards LER 82-179/03L-0 (← links)
- 05000373/LER-1982-175, Forwards LER 82-175/03L-0 (← links)
- 05000373/LER-1983-117, Updated LER 83-117/03X-1:on 830920 & 30,RHR HX B Outlet Valve Limit Switches Temporarily Changed,Allowing Wedge Travel to Stop (← links)
- 05000373/LER-1982-156, Forwards LER 82-156/03L-0 (← links)
- 05000373/LER-1982-157, Forwards LER 82-157/03L-0 (← links)
- 05000373/LER-1982-158, Forwards LER 82-158/03L-0 (← links)
- 05000373/LER-1982-149, Forwards LER 82-149/03L-0 (← links)
- 05000373/LER-1983-029, Forwards LER 83-029/03L-0 (← links)
- 05000373/LER-1983-024, Forwards LER 83-024/03L-0 (← links)
- 05000373/LER-1983-023, Forwards LER 83-023/03L-0 (← links)
- 05000373/LER-1983-021, Forwards LER 83-021/01T-0 (← links)
- 05000373/LER-1983-020, Forwards LER 83-020/03L-0 (← links)
- 05000373/LER-1983-016, Forwards LER 83-016/03L-0 (← links)
- 05000373/LER-1995-001, Cancels LER 95-001-00 for Facility.Licensee Determined That LaSalle County Station Not in Condition Prohibited by TS 3.4.3.2 (← links)
- 05000373/LER-1983-019, Forwards LER 83-019/03L-0 (← links)
- 05000373/LER-1983-018, Forwards LER 83-018/03L-0 (← links)
- 05000373/LER-1983-017, Forwards LER 83-017/03L-0 (← links)
- 05000373/LER-1983-015, Forwards LER 83-015/03L-0.Detailed Event Analysis Encl (← links)
- 05000373/LER-1983-006, Forwards Updated LER 83-006/01X-1 (← links)
- 05000373/LER-1983-012, Forwards LER 83-012/03L-0 (← links)
- 05000373/LER-1983-001, Forwards LER 83-001/01T-0 (← links)
- 05000373/LER-1982-171, Forwards LER 82-171/03L-0 (← links)
- 05000373/LER-1982-094, Forwards LER 82-094/03L-0 (← links)
- 05000373/LER-1982-096, Forwards LER 82-096/03L-0 (← links)
- 05000373/LER-1982-093, Forwards LER 82-093/03L-0.Detailed Event Analysis Encl (← links)
- 05000373/LER-1983-010, Forwards LER 83-010/03L-0 (← links)
- 05000373/LER-1982-090, Forwards Revised LER 82-090/03X-1 (← links)
- 05000373/LER-1998-016, Forwards LER 98-016-00,per 10CFR50.73(a)(2)(i).Attachment a Provides Commitments for Submittal (← links)
- 05000373/LER-1998-013, Forwards LER 98-013-00,IAW 10CFR50.73(a)(2)(iv).Commitments Made by Util,Encl (← links)
- 05000373/LER-1983-026, Forwards LER 83-026/03L-0 (← links)
- 05000373/LER-1983-028, Forwards LER 83-028/03L-0 (← links)
- 05000373/LER-1983-027, Forwards LER 83-027/03L-0 (← links)
- 05000373/LER-1983-030, Forwards LER 83-030/03L-0 (← links)
- 05000373/LER-1999-001, Forwards LER 99-001-00,IAW 10CFR50.73(a)(2)(ii).Attachment a Provides Commitments for Submittal (← links)
- 05000373/LER-1982-089, Forwards Updated LER 82-089/03X-1 (← links)
- 05000373/LER-1998-008, Forwards LER 98-008-00 IAW 10CFR50.73(a)(2)(i).Commitments Made by Util,Provided in Attachment a (← links)
- 05000373/LER-1998-002, Forwards LER 98-002-00,per 10CFR50.73(a)(2)(i).Commitments Made by Util,Encl (← links)
- 05000373/LER-1998-010, Forwards LER 98-010-00,IAW 10CFR50.73(a)(2)(ii).Commitments Made within Ltr,Encl (← links)
- 05000373/LER-1998-006, Forwards LER 98-006-00 IAW 10CFR50.73(a)(2)(i).Attachment a Provides Commitments for Submittal (← links)
- 05000373/LER-1998-001, Forwards LER 98-001-00,being Submitted to Nrc,Per 10CFR50.73(a)(2)(i).Rept Contains Listed Commitments (← links)
- 05000373/LER-1998-007, Forwards LER 98-007-00,being Submitted to Nrc,Per 10CFR50.73(a)(2)(ii).Commitments for Submittal,Encl (← links)
- 05000373/LER-1998-005, Forwards LER 98-005-00 IAW 10CFR50.73(a)(2)(ii).Commitments Made by Util,Contained in Attachment a (← links)
- 05000373/LER-1999-003, Forwards LER 99-003-00 IAW 10CFR50.73(a)(2)(iv).Commitments for Submittal Also Encl (← links)
- 05000373/LER-1999-002, Forwards LER 99-002-00,IAW 10CFR50.73(a)(2)(i).Commitments Made by Util Are Listed (← links)
- 05000373/LER-1982-052, Forwards LER 82-052/03L-0 (← links)
- 05000373/LER-1982-050, Forwards LER 82-050/03L-0 (← links)
- 05000373/LER-1982-045, Forwards LER 82-045/03L-0 (← links)
- 05000373/LER-1982-053, Forwards LER 82-053/03L-0 (← links)
- 05000373/LER-2023-001-01, Air Circuit Breaker (Acb) Mechanically Operated Contacts (MOC) Switch Failed to Actuate (← links)
- 05000373/LER-2024-004-01, Emergency Diesel Generator Auto-Start and Load Due to Loss of System Auxiliary Transformer (← links)
- 05000373/LER-2024-003-01, Supplement to Technical Specification (TS) Limiting Condition for Operation (LCO) 3.6.1.3 Completion Time Exceeded (← links)
- 05000373/LER-2024-004, Emergency Diesel Generator Auto-Start and Load Due to Loss of Station Auxiliary Transformer (← links)
- 05000373/LER-2024-003, Technical Specification (TS) Limiting Condition for Operation (LCO) 3.6.1.3 Completion Time Exceeded (← links)
- 05000373/LER-2024-002, Reactor Protection System Half Scram Due to Motor Generator Set Electric Power Monitoring Assembly Output Breaker Trip (← links)
- 05000373/LER-2024-001, Core Operating Limits Report Thermal Limits Exceeded (← links)
- 05000373/LER-2023-002, Turbine Stop Valve Limit Switch Failure Due to Lubricant Degradation (← links)
- 05000373/LER-2023-001, Low Pressure Core Spray Inoperable Due to Minimum Flow Valve Flow Pressure Switch Failure (← links)
- 05000373/LER-2022-004, Both Trains of Main Control Room and Auxiliary Electric Room HVAC Declared Inoperable Due to Compressor Trips (← links)
- 05000373/LER-2022-003-02, Supplement to Main Control Room and Auxiliary Electric Room HVAC Declared Inoperable Due to Multiple Component Failures (← links)
- 05000373/LER-2022-003-01, Main Control Room and Auxiliary Electric Room HVAC Declared Inoperable Due to Multiple Component Failures (← links)
- 05000373/LER-2022-003, Main Control Room and Auxiliary Electric Room HVAC Declared Inoperable Due to Multiple Component Failures (← links)
- 05000373/LER-2022-001, Turbine Stop Valve Limit Switch Failure Due to Lubricant Degradation (← links)
- 05000373/LER-1997-026-01, :on 970715,inadequate Channel Functional Test of Refueling Interlocks Was Discovered.Caused by Procedural Deficiencies.Procedure to Perform Logic Sys Functional Test on Rod Block Logic Will Be Developed (← links)
- 05000373/LER-1997-005, :on 970220,potential Loss of Both Trains of SGTS & Containment Pressure Suppression During First 10 of LOCA Was Noted.Caused by Deficiencies in Original Design Analysis & Procedures.Revised TS 3.6.1.8 (← links)
- 05000373/LER-1997-005-04, Forwards LER 97-005-04,IAW 10CFR50.73(a)(2)(ii).Commitments Made by Util,Encl (← links)
- 05000373/LER-1998-002-06, :on 980510,noted That EDGs Were Not Being Declared Inoperable in Quarterly Tests When Engine Cooling Was Involved.Caused by Failure to Establish Procedural Guidance.Will Revise Diesel Surveillance Procedures (← links)
- 05000373/LER-1997-023-01, :on 970626,identified Inadequate Channel Functional Testing of Rps.Caused by Procedure Deficiencies. Will Revise Surveillance Procedures to Encompass Requirements of Channel Functional Testing & Calibr (← links)
- 05000373/LER-1989-023-01, :on 890908,reactor Recirculation Process Sample Inboard Isolation Stop Valve Spuriously Went Closed W/No Apparent Isolation Signal Present.Caused by Short in Coil of Relay 1B21H-K72.Work Request Written (← links)
- 05000373/LER-1989-011, :on 890302,sys Auxiliary Transformer Tripped. on 890304,diesel Generator 2B Fuel Filter Inlet Pressure Gauge Found Leaking Fuel Oil Into Room.Caused by Damaged Gauge Due to Vibration.Line Plugged (← links)
- 05000373/LER-1989-015-01, :on 890428,fire Protection Valves Found to Exceed Surveillance Frequency Requirements of Tech Specs 4.7.5.1.1.a/b.Caused by Error in Two Station Procedures. Procedures Revised (← links)
- 05000373/LER-1989-014-01, :on 890428,error in Reactor Bldg Ventilation Isolation Damper Indicating Light Circuit Logic Found.Caused by Inconsistency Between Drawings & Method of Timing Damper Closing.Damper Repaired & Circuitry Modified (← links)
- 05000373/LER-1989-016, :on 890502,Tech Specs Violated.Caused by Diesel Generator Surveillances Being Revised Incorrectly After Diesel Generator Prelube Mods Installed.On 890503,diesel Generator Would Not Shut Down (← links)
- 05000373/LER-1997-030-01, :on 970818,containment Integrated Leak Rate Test Error Identified.Caused by Failure to Track Issue to Resolution.Evaluated & Provided NRC W/Justification to Demonstrate Performance of Cilrts W/Channel Vent Plugs (← links)
- 05000373/LER-1989-005, :on 890207,determined That Static-O-Ring in Main Steam Line Flow Switch Exceeded Rejection Limits,Cause Not Determined.Replacement Flow Switch Installed,Calibr & Placed in Svc (← links)
- 05000373/LER-1989-010-01, :on 890303,setpoint Drift of Low Level Confirmed Automatic Depressurization Sys Permissive Switch Found in Excess of Reject Limit.Caused by Low Reactor Level During Reactor Scram.Mods Planned (← links)
- 05000373/LER-1989-008, :on 890228,reactor Vessel Low Water Level 2 Switch Found W/Setpoint Out of Tolerance in Excess of Reject Limit During Surveillance.Caused by Setpoint Drift.Work Request L87899 Written to Replace Instrument (← links)
- 05000373/LER-1989-009-01, :on 890302,phase to Ground Fault Resulted in Generator Isolation.Caused by Failure Phase C Lightning Arrestor on Primary of Side of Station Auxiliary Transformer (← links)
- 05000373/LER-1994-015-01, :on 941212,PCI & Scram Due to Switch Failure Was Noted.Caused by Group 1 Isolation Signal Initiated by Spurious Trip.Replaced Switch (← links)
- 05000373/LER-1998-010-02, :on 980416,incorrect Range Radiation Detectors Were Installed in SR Sys.Caused by Human Error Performance. Replaced Incorrect Range Detectors (← links)
- 05000373/LER-1989-022, :on 890810,RCIC Received Div I & Div II Isolation on RCIC High Steam Line Flow.Caused by Spurious High Steam Flow Signal.Rcic Sys Piping Integrity Verified & Isolation Logic Reset (← links)
- 05000373/LER-1997-046, :on 971216,potential Pressurization of TBV Exhaust Tunnel Resulted from Ms Helb.Caused by Calculation Error.Revised Final SAR to Include VT Exhaust Ventilation Dampers (← links)
- 05000373/LER-1997-046-01, Forwards LER 97-046-01 IAW 10CFR50.73(a)(2)(ii).Commitments Made within Ltr,Encl (← links)
- 05000373/LER-1998-011, :on 980410,TS FP Special Rept Was Not Submitted.Caused by Mgt Deficiency.Proper Guidance Re Fire Pump Operability Has Been Provided to Plant Operators (← links)
- 05000373/LER-1997-020, :on 970422,recirculation Flow Converter Calibration & Functional Testing Defciencies Were Determined.Caused by Inadequate Reviews of Test Procedures. Engineering Evaluated Procedure Deficiencies (← links)
- 05000373/LER-1997-020-01, Forwards LER 97-020-01 IAW 10CFR50.73(a)(2)(i).Attachment a Provides Commitments for Submittal (← links)
- 05000373/LER-1998-012, :on 970410,low-low Setpoint Function of MSSVs Had Not Been Tested IAW TS SRs Due to Inadequate Procedural. Procedure LTS-500-5 Has Been Deleted (← links)
- 05000373/LER-1997-012-01, Forwards LER 97-012-01,being Submitted to NRC IAW 10CFR50.73(a)(2)(i).Commitments,encl (← links)
- 05000373/LER-1989-009, :on 890302,phase to Ground Fault Occurred at Phase C Lightning Arrestor on Primary Side of Sys Auxiliary Transformer.Caused by Phase to Ground Fault That Occurred from Lightning Arrestor Due to Blown Debris (← links)
- 05000373/LER-1989-021, :on 890609,RCIC Outboard Isolation Valve Failed to Open.Caused by build-up of Corrosion Products Between Stem & Stem Nut Causing Breaker to Trip.Valve Operator Disassembled,Inspected & Repaired (← links)
- 05000373/LER-1989-013-01, :on 890331,suppression Chamber High Level Alarm Exceeded Tech Spec Alarm Setpoint.Caused by Procedural Inadequacy.Switch 1E22-N002A Calibr (← links)
- 05000373/LER-1989-020, :on 890529,unit 250 Volt Dc Main Feed Circuit Breaker to Bus 121Y Failed During Manual Closure Attempt, Rendering RCIC Sys Inoperable.Caused by Failure of Main Feed Circuit Breaker.Closing Mechanism Repaired (← links)
- 05000373/LER-1989-019, :on 890526,determined That Previous Test Results of LTS-400-16 Did Not Meet Acceptance Criteria of Reg Guide 1.52.Root Cause of Event Was That Charcoal Adsorber Efficiency of 90% Assumed (← links)
- 05000373/LER-1989-017, :on 890515,operating Dept Started RHR Pump a, But Diesel Generator O Cooling Water Pump Did Not Auto Start as Expected.Caused by Pitted Contacts Internal to Breaker. Contacts Cleaned & Burnished (← links)
- 05000373/LER-1989-018, :on 890515,RCIC Received Divs I & II Isolation on RCIC High Steam Line Flow.Caused by Spurious High Steam Flow Signal Generated When Steam Admitted to Steam Line. Isolation Logic Reset (← links)
- 05000373/LER-1989-012-01, :on 890309,pressure Differential Switch PDS-1E31-N013BB Found to Have Diaphragm Leak During Instrument Surveillance LIS-RI-101.Replacement Switch Installed,Calibr & Functionally Tested (← links)
- 05000373/LER-1998-012-01, :on 980729,reactor Scram During Scram Discharge Volume Surveillance Occurred.Caused by Inadequate Procedures.Revised Subject Surveillance Procedure Accordingly (← links)
- 05000373/LER-1987-028-01, :on 870813,control Room B HVAC Sys Ammonia Detector B Tripped & ESF Actuation Occurred.Caused by Tape Breakage in Chemcassette Assembly.Chemcassette Tape Readjusted & Verified as Functional (← links)
- 05000373/LER-1987-026-01, :on 870706,discovered That RHR Pump Motor Terminations Not Environmentally Qualified.Caused by Mods Performed W/O Properly Identified Environ Qualifications. Qualified NUREG-0588 Splices Will Be Installed (← links)
- 05000373/LER-1987-027, :on 870720,RHR,HPCS & LPCS Pump Motor Terminations Found Not in Exact Configuration,Per Environ Qualification Rept.Caused by Not Identifying Motor Connections in Exact Configuration (← links)
- 05000373/LER-1998-008-03, :on 980720,determined That Fire Protection Valves Were Not Tested Per Ts.Caused by Mgt Deficiencies Associated W/Mod.Subject Valves Have Since Been Cycled & Demonstrated to Have Been Operable (← links)
- 05000373/LER-1998-009-02, :on 980721,Div III EDG Actuated During Removal of Sys Auxiliary Transformer from Service.Caused by Failure to Use Operating Procedure by Personnel.Div III Was Placed in Proper Configuration for SAT to Remain de-energized (← links)
- 05000373/LER-1998-009-01, Forwards LER 98-009-01,IAW 10CFR50.73(a)(2)(iv).Commitments Made within Ltr,Encl (← links)
- 05000373/LER-1987-036-01, :on 871114,control Room HVAC Sys a Ammonia Detector OXY-VC125A Tripped.Caused by Chemcassette Broken at Takeup Spool.Chemcassette Tape Replaced (← links)
- 05000373/LER-1987-035-01, :on 871108,ammonia Detector Tripped Spuriously. Caused by Failure of Detector Front Optics Indicator Lamp. Indicator Lamp Was Replaced (← links)
- 05000373/LER-1998-006-03, :on 980622,local Fire Detection Module in Standby Gas Treatment Sys Was Located in Harsh Environ. Caused by Inadequately Addressed Potential Impact. Performed Assessment (← links)
- 05000373/LER-1987-034-02, :on 871017,Control Room a HVAC (VC) Intake Radiation Monitor 1D18-K751D Spuriously Tripped (Spiked High) Causing Auto Start of VC Emergency Makeup Train A. Possibly Caused by Random Noise in Electronics (← links)
- 05000373/LER-1988-029-01, :on 881230,discovered That Reactor Vessel Low Water Level 3 Switch LS-1B21-N038B Found W/Setpoint out-of- Tolerance in Excess of Reject Limit.Caused by Degradation of Contact on Microswitch.Rejected Switch Removed (← links)
- 05000373/LER-1987-033-01, :on 870917,diesel Generator 1A Failed to Close Output Breaker & Synchronize to Bus 142Y During Surveillance Testing.Cause Unknown.Event Could Not Be Repeated.Procedure LTP-500-1 Written for Troubleshooting (← links)
- 05000373/LER-1987-032-01, :on 870917,reactor Scram Occurred on Low Reactor Water Level Signal.Caused by Difficulty of Controlling Reactor Water Level.Low Load Regulating Valve Will Be Added to Feedwater Sys (← links)
- 05000373/LER-1988-028, :on 881219,reactor Vessel Low Water Level 3 Switch Found W/Setpoint out-of-tolerance in Excess of Reject Limit.Caused by Setpoint Drift.Level Switch Will Be Replaced by Analog Trip Sys (← links)
- 05000373/LER-1989-007-01, :on 890210,potential Loss of Control Room Isolation Noted.Caused by Possible Failure of Exhaust Purge Dampers in Open Position W/O Direct Indication.Dampers Mechanically Disconnected & Wired Closed (← links)
- 05000373/LER-1987-025-01, :on 870618,while Performing Surveillance LTS-600-11,snubber Found Omitted from Surveillance List for Rcic.Caused by Error in Documentation.Snubber Replaced, Tested & Added to Station Surveillances (← links)
- 05000373/LER-1987-031-01, :on 870905,reactor Protection Sys (RPS) Motor Generator B Set Tripped Due to Control Relay Fault,Which in Turn,Deenergized RPS Bus B.Cause of Control Relay Failure Unknown.Power Restored to Bus.Isolations Reset (← links)
- 05000373/LER-1987-030-01, :on 870902,full Scram Occurred When Half Scram Condition Had Not Been Reset Prior to Performing Test on Relay.Caused by Inadequate Communication.Event Discussed W/ Personnel Involved (← links)
- 05000373/LER-1989-004, :on 890125,spurious B Control Room HVAC Sys B Ammonia Detector Trip Occurred.Root Cause of Event Could Not Be Determined.Tech Spec Amend Request Approved on 890118 to Remove Refs to Ammonia Detectors (← links)
- 05000373/LER-1987-023-01, :on 870531,technician Identified Mispositioned Instrument Root Valve While Performing Routine Surveillance. Cause Undetermined.Procedure Revised Requiring Lockwiring of All Instrument Valves During Surveillance (← links)
- 05000373/LER-1987-029-01, :on 870829,blown Fuse Caused Outboard Isolation Valve IG33-F004 to Close.Caused by Procedural Deficiency. Blown Fuse Replaced,Outboard Isolation Valve Reopened & RWCU Sys Restarted (← links)
- 05000373/LER-1987-024-01, :on 870602,control Room HVAC a Ammonia Detector OXY-VC125YB Tripped.Caused by Tape Breakage in Chemcassette Assembly.Chemcassette Tape Adjusted by Instrument Technician & Detector Returned to Operable svc.W/870701 (← links)
- 05000373/LER-1998-001-06, :on 980131,missed TS Fire Watch Were Noted Due to Personnel Error.Terminated Responsible Contracted Fire Watch Inspectors (← links)
- 05000373/LER-1997-033-01, Forwards LER 97-033-01,updating Safety Analysis.Commitments Made by Util,Listed (← links)
- 05000373/LER-1997-028, :on 970618,missed RHR Sys Increased Frequency Surveillance Resulted in Operation to Be Outside of TS Requirements Due to Personnel Error.Improved Procedures Governing Station Surveillances (← links)
- 05000373/LER-1998-004-02, :on 980227,TS Fire Watch Was Missed Due to Personnel Error.Permanent Policy Was Established to Ensure That Fire Watch Supervisors Check That Each Insp Route Started at Top of Each Hour (← links)
- 05000373/LER-1997-032, :on 970904,failure to Comply W/Ts Action Statement Was Determined.Caused by non-conservative Maintenance Planning.Dg 1A Control Room Frequency Meter Was Replaced (← links)
- 05000373/LER-1998-007-03, :on 980319,potential Pressurization of Reactor Building Ventilation Exhaust Plenum Resulted from Main Steam Helb.Caused by Calculation Error.Lasalle County Station UFSAR Will Be Revised (← links)
- 05000373/LER-1998-005-02, :on 980320,noted That post-LOCA H2/02 Monitoring Sys Design Is Inconsistent W/Ufsar.Cause Indeterminate.Appropriate Documentation Will Be Obtained or 10CFR50.59 Evaluation Will Be Completed (← links)
- 05000373/LER-1999-003-04, :on 990902,reactor Scram on Low Reactor Water Level,Was Received.Caused by Personnel Error.Appropriate Disciplinary Action Taken with non-licensed Operator (← links)
- 05000373/LER-1990-012-04, :on 901016,automatic Start of Oa Control Room Emergency Makeup Fan Occurred Due to Procedural Deficiency (← links)
- 05000373/LER-1998-003-02, :on 980210,abnormal Startup of Idle Reactor Recirculation Loop Analysis Not Bounding Due to Vendor Inadequate Calculation.Caused by GE Insufficient Analyses. Resolution Will Be Addressed by GE CA Program (← links)
- 05000373/LER-1996-019-03, Forwards LER 96-019-03,re Event Which Occurred at LaSalle County Station Unit 1.Commitments Made within Ltr,Listed (← links)
- 05000373/LER-1987-022-01, :on 870528,reactor Scram Occurred Due to Failure of Turbine Driven Reactor Feed Pump Control Valve. Cause Unknown.Licensed Personnel Tailgated on Event & Tracked by Air 373-200-87-04702 (← links)
- 05000373/LER-1986-038, :on 860921,reactor Mode Switch over-rotated to Run Position,Resulting in Scram Signal & Main Steam Line Isolation.Caused by Personnel Error.Switch Returned to Startup Position.Personnel Briefed (← links)
- 05000373/LER-1986-022, :on 860612,shutdown Cooling Isolation Occurred During Performance of LES-PC-107 Re Group 7 Isolation Logic Sys Functional Test.Caused by Operation of Wrong Keylock Switch.Isolation Signal Reset (← links)
- 05000373/LER-1987-013-01, :on 870312,high Drywell Temp Event Began on Trip of Primary Containment Fan B.Caused by Failure of Fan Motor Bearings.Fan Repaired.Drywell Equipment Not Damaged (← links)
- 05000373/LER-1987-021-01, :on 870513,inadvertent ESF Actuation Occurred. Caused by Unanticipated Entanglement of out-of-svc Card W/ Circuit Breaker & Cabinet Door Latch.Circuit Reenergized by Closing Breaker 23 (← links)
- 05000373/LER-1987-010, :on 870302,level Switch LS-1B21-NO38B Found W/ out-of-tolerance Setpoint During Performance of LIS-NB-106. Caused by Setpoint Drift.Switch Replaced & New Switch Recalibr & Placed in Svc (← links)
- 05000373/LER-1986-040-01, :on 861118,control Room HVAC Sys a Ammonia Detector OXY-VC125YA Tripped & Declared Inoperable.Caused by Sample Wisa Pump Providing Insufficient Flow Due to Sample Pump Degradation.Pump Replaced (← links)
- 05000373/LER-1986-033, :on 860806,RCIC High Ambient Leak Detection Switch Tripped,Causing Inboard Div II Isolation Signal. Caused by Faulty Leak Detection Temp Module.New Module Installed & Calibr (← links)
- 05000373/LER-1986-034, :on 860807,automatic Start of Diesel Generator 1B Occurred.Caused by Spurious Actuation of Protection Logic Relay.Relay Replaced (← links)
- 05000373/LER-1987-020-01, :on 870416,control Room Received Indications of Loss of 120/208 Volt Power at Motor Control Ctr 136X-1. Caused by Painters Drop Cloth Draped Over Ctr Coming Loose & Tripping Breaker.Contractors Informed (← links)
- 05000373/LER-1984-062, :on 840930,RHR Shutdown Cooling Suction Inboard Isolation Valve 1E12-F009 Failed to Open Automatically or Manually.Cause Undetermined.Valve Opened.Shutdown Cooling Initiated.Procedures Revised (← links)
- 05000373/LER-1987-018-01, :on 870413,control Room HVAC ESF Actuation Occurred Due to Broken Ammonia Detector Chemcassette Tape. Caused by Weak Magnets.Instrument Maint Procedure LIP-GM-940 Performed to Adjust Chemical Cassette Tape (← links)
- 05000373/LER-1986-039, :on 861016,discovered That RHR High Pressure Shutdown Cooling Switch Lockwired Closed.Caused by Personnel Error.Applicable Personnel Trained.Revs Made to Functional Test Procedures (← links)
- 05000373/LER-1986-036-01, :on 860521,snubber Functional Tests Confirmed 104 safety-related Snubbers Failed to Meet Test Acceptance Limits.Cause of Each Failure Determined & Listed.Corrective Actions Implemented from 860521-0829 (← links)
- 05000373/LER-1987-008-01, :on 870203,required Sample of Offgas to Determine Hydrogen Content Taken Late.Caused by Personnel Error.Individual Foreman Counseled & Second Alarm Programmed Into Reminder Clock (← links)
- 05000373/LER-1986-031, :on 860715,spurious Trip of High Radiation Monitor Occurred on Control Room HVAC Sys B.Caused by Defective High Voltage Board Indicator Relay 2D18-K751B. Power Control Board & Capacitor Replaced (← links)
- 05000373/LER-1987-005-01, :on 870131,reactor Scram Occurred on Turbine Stop Valve Fast Closure Due to Loss of Alternator Exciter Field.Caused by Degradation of Collector Brushes Due to Insp Failure.Brushes Replaced.Insps Upgraded (← links)
- 05000373/LER-1986-028, :on 860702,control Room B HVAC Sys Ammonia Detector OXY-VC165YA Tripped Spuriously.Caused by Broken Fuseholder.Fuseholder Resoldered,Components Replaced & Detector Reset (← links)
- 05000373/LER-1987-003-03, :on 870126,reactor Scram Occurred from Main Generator Lockout Due to Failed Potential Transformer Contacts.All Slide Contacts Cleaned & Relaying & Metering B Phase Slide Contacts Replaced (← links)
- 05000373/LER-1987-007, :on 870120,while in Operational Condition 1 at 88% Power,Esf Alarm & half-scram on Reactor Protection Sys B Occurred When Power Lost to Scram Discharge Vol Redundant Level Sensors.Caused by Contractor Error (← links)
- 05000373/LER-1987-004-02, :on 870128,ammonia Detector Tripped,Causing ESF Damper Actuation & Min Outside Air Dampers to Close.Caused by Jammed Chemcassette in Makeup Spool.Chemcassette Replaced & Preventive Maint Program Initiated (← links)
- 05000373/LER-1986-021, :on 860608,ESF Damper Actuated.Caused by Spurious Trip on High Radiation Monitor/Detector 2D18-K751D Due to Apparent Bad Connector from Indicator Relay.Detector Observed.No Further Problems Noted (← links)
- 05000373/LER-1997-030, :on 970818,containment Integrated Leak Rate Test Error Was Identified.Caused by Failure to Track Issue to Resolution.Prior to Unit 1 Startup,Evaluation of Channel Welds & Plugs Will Be Performed (← links)
- 05000373/LER-1987-002-06, :on 870115,diesel Generator O Output Breaker Failed to Close Onto Bus 241Y During Operability Test.Caused by Limit Switch Dev.Tsc in Breaker Close Circuitry. Surveillance Computer Program Being Updated (← links)
- 05000373/LER-1986-018-02, :on 860504,ESF Damper Actuated When Control Room a HVAC Sys Ammonia Detector OXY-VC125YB Tripped.Caused by Binding of Tape Cassette Spool Mechanism in Detector Unit.Tape Realigned.Alarm Reset (← links)
- 05000373/LER-1987-002-03, :on 870109,QA Audit Revealed Procedural Deficiencies W/Instrument Maint APRM Rod Block & Scram Calibr & Functional Tests.Caused by Procedural Deficiency. Procedure Revised (← links)
- 05000373/LER-1987-006, :on 870106,Div II Dc Distribution Panels 212X & 212Y Became Inoperable But Not Declared Inoperable.Caused by Personnel Error.Battery Test Procedures Will Be Revised & Personnel Counseled (← links)
- 05000373/LER-1997-029, :on 970723,full Scram Signal Generated During Performance of LES-PC-108, Main Steam Isolation Actuation Logic Sys Functional Test. Caused by Poor Mgt Decision to Defer Scheduled Maint.Sspvs Replaced (← links)
- 05000373/LER-1986-025, :on 860625,spurious Trip of Control Room Ventilation hi-radiation Monitor Occurred Due to Incomplete Stabilization Following Calibr.Cause Not Determined. Detector Recalibr (← links)
- 05000373/LER-1997-026, :on 970715,inadequate Channel Functional Testing of RMCS Refueling Interlocks Were Identified.Caused by Procedure Deficiencies.Appropriate Rod Block & Refueling Interlocks Procedures Revised to Satisfy TS (← links)
- 05000373/LER-1986-008-02, :on 860226,when Standby Liquid Control Sys Injection Test LOS-SC-R1 Commenced,Pressure Transient from Injection Line to Differential Pressure Indicator PDI-1B21-R005 Occurred.Caused by Air in Line (← links)
- 05000373/LER-1986-007-03, :on 860226,discovered That Several Primary Containmet Isolation Valves Installed Using Wrong Gasket Matl,Invalidating Leak Rate Test Data.Caused by Inadequate Instructions.Adequate Instructions Provided (← links)
- 05000373/LER-1986-009-02, :on 860225,during Reactor Protection Sys Bus B Transfer,Partial Group IV (ESF Actuation) Isolation Received W/Ventilation Fan Tripping.Caused by Alligator Clip Jumper Slippage Off Terminal Screw (← links)
- 05000373/LER-1986-010-01, :on 860304,during Test LIS-PC-15,primary Containment Isolation Sys Groups II & IV Isolation Occurred. Caused When Jumper Became Grounded During Installation, Causing Fuse to Blow.Fuse Replaced (← links)
- 05000373/LER-1999-002-05, :on 990623,TS Re Rod Operability Surveillance Was Missed.Caused by Personnel Error.Counseled Responsible Individual (← links)
- 05000373/LER-1987-017-01, :on 870402,primary Containment Pressure Switch Isolated Longer than Allowed by Tech Spec.Caused by Personnel Error.Tech Spec Timeclock Stamp Program Implemented for Surveillance Purposes (← links)
- 05000373/LER-1987-016, :on 870401,RCIC High Steam Flow Isolation Signal Received Due to Inadvertent Draining of Instrument Line.Caused by Inattention to Detail by Technician. Instrument Line Backfilled & Returned to Svc (← links)
- 05000373/LER-1987-019-01, :on 870403,during Weekly Control Rod Exercising surveillance,11 Rods Listed on Signoff Sheet Skipped by Previous Shift.Caused by Personnel Error.Personnel Will Be Trained on Event (← links)
- 05000373/LER-1986-035, :on 860811,diesel Generator 1B Failed to Start. Caused by Failure of Agastat Time Delay Relay Model 7012PE Due to Lost Screw Holding Diaphragm.Relay Replaced (← links)
- 05000373/LER-1987-015-01, :on 870328,RCIC Water Leg Pump Tripped on Breaker Thermal Overloads & Could Not Be Restarted.Caused by Procedural Inadequacy of Operating Surveillance.Pump Replaced (← links)
- 05000373/LER-1986-025-01, :on 860625,ESF Actuation of Control Room HVAC Sys B Emergency make-up Train from Spurious Trip of High Radiation Monitor 2D18-K751C Occurred.Caused by Incomplete Stabilization Following Detector Calibr (← links)
- 05000373/LER-1985-032-02, :on 850328,excessive Leakage Found During Local Leak Rate Test on Inboard Feedwater Check Valve.Caused by Deterioration of Soft Seat Matl Due to Exposure to Hot Feedwater.Matl Replaced (← links)
- 05000373/LER-1986-026, :on 860623,primary Containment Air Lock Leak Rate Test Not Performed within 6 Months Prior to Startup. Caused by Engineer Inadequately Listing Frequency as 184 Days W/O Noting Tech Spec 4.0.2 (← links)
- 05000373/LER-1985-066, :on 851105,during Local Leak Rate Test,Leakage in Excess of Limit Observed.Caused by Valve Disc Not Fully Seated in Valve Seat.Valve Disassembled,Inspected & Repaired (← links)
- 05000373/LER-1986-043, :on 861204,reactor Scram Occurred,Caused by Concurrent half-scrams on Reactor Protection Sys a & B Due to Surveillance Testing & Spurious Main Steam Line High Radiation Signal,Respectively (← links)
- 05000373/LER-1986-042-01, :on 861204,HPCS Water Leg Discharge Check Valve Failed to Close on Reverse Flow as Designed During Performance of LOS-HP-Q1.Caused by Accumulation of Magnetite on Valve Disc.Valve Internals Cleaned (← links)
- 05000373/LER-1988-016-04, :on 880717,control Room HVAC Sys Intake Radiation Monitor Instrument Tripped.Caused by Random Noise of Unknown Origin in Electronics.Mod Initiated to Perform Logic Rev of Radiation Monitors (← links)
- 05000373/LER-1986-041-01, :on 861126,RWCU Sys Primary Isolation Occurred Due to Spurious Differential Temp Signal.Cause Unknown. Instrument Wiring Checked.Installation of Time Delay Relays to Ensure Leak Exists Proposed (← links)
- 05000373/LER-1987-014-01, :on 870319,reactor Scram Occurred Due to Generator Lockout & Subsequent Turbine Trip.Caused by Moisture Intrusion Into Bus Ducts.Main Power Transformers Inspected & Tested (← links)
- 05000373/LER-1986-020-01, :on 860530,Groups 2 & 4 Primary Containment Isolation Occurred.Caused by Installation of Spade Lug Jumper Interrupting Continuity of Isolation Logic.Alligator Clip Used to Restore Continuity (← links)
- 05000373/LER-1986-032, :on 860722 & 0803,discovered That Two Reactor Vessel Low Level Switches Out of Tolerance.Cause Unknown. Level Switches Immediately Recalibr to Normal Setpoint Values.Comprehensive Action Plan Developed (← links)
- 05000373/LER-1999-001-02, :on 990407,main Control Room,Auxiliary Electrical Equipment Room & Switchgear Room Ventilation Sys Were Found Outside Design Basis.Caused by Inadequate Initial Design.Placed Vx Sys Heat Recovery Fans in Stop Position (← links)
- 05000373/LER-1988-023-03, :on 881017,ESF Isolation of Reactor Bldg Ventilation Occurred Due to Jumper Falling Off Relay 1PDS-VR049X3 During Surveillance Testing.Caused by Unplanned Removal of Electrical Jumper (← links)
- 05000373/LER-1987-012-01, :on 870311,control Room HVAC Sys a Ammonia Detector OXY-VC125YB Tripped.Caused by Broken Chemcassette Tape.Tape Adjusted & Detector Reset (← links)
- 05000373/LER-1988-024-03, :on 881017,drywell Circuits Found Energized Due to Lack of Sufficient Administrative Controls.Circuits de-energized & Breakers for Drywell Circuits,Welding Grid Sys 1A & 1B & Drywell Hoists Taken Out of Svc (← links)
- 05000373/LER-1988-009, :on 880529,HPCS Lo Lo Level Initiation Static-O-Ring Level Diaphragm Rupture Discovered.Cause Undetermined.Replacement Switch Installed,Calibr & Functionally Tested Satisfactorily (← links)
- 05000373/LER-1987-005, :on 870131,reactor Scram Occurred on Turbine Stop Valve Fast Closure.Caused by Degradation of Alternator Exciter Collector Brushes.Defective Brushes Replaced.Brushes Will Be Inspected Weekly (← links)
- 05000373/LER-1987-011-01, :on 870307,HPCS Water Leg Pump Discharge Check Valve Failed to Close on Reverse Flow.Caused by Surface Irregularities on Valve Seat.Valve Repaired (← links)
- 05000373/LER-1987-010-01, :on 870302,level Switch LS-1B21-N038B Found W/ Setpoint out-of-tolerance in Excess of Reject Limit for Application.Caused by Setpoint Drift.Level Switch Replaced & New Switch Recalibr (← links)
- 05000373/LER-1985-057, :on 850802,radiation Survey of Facility Dump Revealed Two 55 Gallon Drums W/Internal Contamination. Cause Unknown.Drums Removed from Dump.Efforts in Progress to Eliminate Dump (← links)
- 05000373/LER-1988-020-03, :on 880926,control Room HVAC Sys a Ammonia Detector Tripped.Caused by Design Deficiency in Chemcassette Tape Mechanism.Chemcassette Tape,Rena Pump,Panel Meter, Photocell Board,Optics Block & Roller Replaced (← links)
- 05000373/LER-1986-024-01, :on 860422,AE Confirmed Design Discrepancies on Small Bone Piping Sys.Caused by Design Personnel Hand Calculation Error.Mods Initiated.Ae Small Bore Piping Analysis Converted to Computerized Format (← links)
- 05000373/LER-1983-028-03, /03L-0:on 830320,steam Leak Discovered on Offgas Steam Jet Air Ejector 1A Drain Line to Turbine Bldg Equipment Drains.Caused by Defective Weldment.Work Request L23380 Generated to Repair Weldment (← links)
- 05000373/LER-1983-027-63, /03L-0:on 830320,steam Leak on Main Turbine Control Valve 1 Stem Seal Leakoff Line ITD20AA 1-/2 Inches Discovered.Caused by Overlap of Weldments.Welds Repaired (← links)
- 05000373/LER-1983-030-03, /03L-0:on 830324,local Leak Rate Test on CRD Removal Hatch Double Gasket Seals Incorrectly Performed Prior to Startup.Caused by Personnel Error.Leak Rate Test Reperformed & New Procedure Lts 100-8 Initiated (← links)
- 05000373/LER-1987-009-01, :on 870217,while Removing Jumpers Installed Per LIS-VR-03,Group IV Isolation Occurred.Caused by Instrument Maint Procedure Inadequacy.Procedure Being Deleted & Replacement Surveillance Being Generated (← links)
- 05000373/LER-1986-037, :on 860908,primary Containment Isolation Sys Isolation of Groups II & IV Occurred.Caused by Inadequate Out of Svc Taken on Reactor Level Switch.Procedure LAP-900-4 Revised.Personnel Training Initiated (← links)
- 05000373/LER-1996-017, :on 961106,determined That MCR Was Outside of Design Basis Due to Inadequate TS Surveillance Procedure. Will Complete Required Tests,Procedure Revs,Analysis & Mods to Establish post-accident Habitability in MCR (← links)
- 05000373/LER-1996-017-02, Forwards LER 96-017-02 Per 10CFR50.73(a)(2)(i).Commitment Made by Util,Listed (← links)
- 05000373/LER-1997-021-02, :on 970512,undrainable Low Areas in Drywell Floor Resulting in Degradation of Lds Due to Increased Delays in Detection of Unidentified Leakage.Caused by Design Specification.Declared Lds Inoperable (← links)
- 05000373/LER-1986-027, :on 860628 & 29,control Room B HVAC Sys Ammonia Detector OXY-VC165YA Spuriously Tripped.Caused by Warped Rubber Capstan Roller.Roller Replaced (← links)
- 05000373/LER-1997-037, :on 971105,DG Response Time Was Not Consistent W/Ts.Caused by Inadequate Review of Procedures.All DGs That Are Required to Be Operable at Present Time Have Had Time Delay for RHR Pumps Recalibrated (← links)
- 05000373/LER-1986-023-02, :on 860613,trip Signal Received Causing Inboard Secondary Containment Isolation Dampers to Isolate & Tripping Supply & Exhaust Fans.Caused by Loss of Continuity While Installing Jumper (← links)
- 05000373/LER-1997-042-01, Forwards LER 97-042-01,which Is Being Submitted to NRC Office to Update Safety Analysis.Commitments Made by Ltr, Listed (← links)
- 05000373/LER-1997-039, :on 971024,unanalyzed Condition While Removing Ms SRV Was Noted.Caused by Inadequate Procedural Guidance. Analyzed Tailpipe Restraints Including Seismic Loads (← links)
- 05000373/LER-1997-039-01, Forwards LER 97-039-01 to Update Safety Analyses.New Commitments Listed (← links)
- 05000373/LER-1996-019-02, Forwards LER 96-019-02 to Update Safety Analysis.New Commitments Listed (← links)
- 05000373/LER-1995-015-01, :on 950824,TS Fire Protection Valve Surveillance Was Missed.Caused by Insufficient Review of TSs During Mod Process.Revised Fire Protection Design Checklist (← links)
- 05000373/LER-1986-022-02, :on 860612,RHR Shutdown Cooling Isolation Occurred During Performance of LES-PC-107.Caused by Operator Error.Operator Counseled on Unacceptability of Actions & Need for Attention to Details (← links)
- 05000373/LER-1986-021-02, :on 860608,ESF Actuation of HVAC Emergency make-up Train B Occurred Due to Spurious Radiation Monitor Trip.Cause Attributed to Electronics Problem W/Radiation Detector 2D18-K751D.Detector Replaced (← links)
- 05000373/LER-1997-038, :on 971020,inadequate Calibr of HR Instrumentation Was Noted.Caused by Misinterpretation of Ts. Channel Functional Testing Requirements for HR Sys Will Be Corrected Through Procedure Changes (← links)
- 05000373/LER-1986-019-02, :on 860521,RCPB Pipe Leaks Found Coming from RHR Loop Injection Piping.Possibly Caused by Entrapped Slag or Other Defect in Plug Seal Weld.Coupling Will Be Capped (← links)
- 05000373/LER-1997-036, :on 971014,identified Error in Station Method of Accomplishing Channel Functional Test Requirements of TS 4.8.3.3.1.b.Caused by Personnel Error.Procedure Revised.W/ (← links)
- 05000373/LER-1997-045, :on 971223,PAMS Instrumentation Was Noted Outside Design Basis.Caused by Personnel Error.Revised EQ Life Calculation for Affected Components (← links)
- 05000373/LER-1997-034, :on 971008,determined That Method Used to Satisfy TS 4.8.1.1.2.d.9 for Verifying auto-connected Loads non-conservative.Caused by Misinterpretation of TS Requirement.Loading Calculations Reviewed (← links)
- 05000373/LER-1997-035, :on 971007,channel Calibration of APRM Flow Biased Simulated Thermal power-upscale Did Not Conform with TS Requirements,Due to Misinterpretation of Table Notation. Surveillance Procedures Will Be Revised (← links)
- 05000373/LER-1986-017-02, :on 860503,reactor Scrammed on Low CRD Charging Water Header Pressure.Caused by Operator Reliance on Defective Low Level Alarm Annunciator.Annunciator Repaired & Operator Counseled (← links)
- 05000373/LER-1986-015-02, :on 860425,full Scram Received During Performance of APRM Rod Block & Scram Function.Caused by Failure of Right Side Switches of Scram Contactor.Switches Realigned (← links)
- 05000373/LER-1986-016-02, :on 860425,fuel Bundle Loaded Into Core W/O Operable source-range Monitor in Corresponding Core Quadrant.Caused by Breakdown in Communications.Personnel Trained.Speaker Phones Installed (← links)
- 05000373/LER-1997-044, :on 971205,potentially Unanalyzed Condition for Automatic Depressurization Sys Accumulator Capacity,Was Identified.Caused by Lack of Design Basis Info.Determined Licensing Basis for ADS Accumulator Capacity (← links)
- 05000373/LER-1985-065-01, :on 850929,both Chlorine Detectors for Control Room & Auxiliary Electrical Equipment Room HVAC Train B Alarmed,Resulting in ESF Damper Operation.Cause Undetermined.Detectors Checked & Recalibr (← links)
- 05000373/LER-1997-043, :on 971125,incomplete TS Surveillance on Div III Edgs,Was Determined.Caused by Inadequate Procedure Review.Dgs Declared Inoperable Until Methodology Developed to Adequately Satisfy Surveillance Requirements of TS (← links)
- 05000373/LER-1984-028, :on 840513,spurious Closure of Div II RCIC Steam Line High Temp Isolation Switch Caused Steam Line to Isolate & Turbine to Trip.Temp Switches Recalibr (← links)
- 05000373/LER-1988-007-07, :on 880503,ESF Isolation Occurred Due to Jumper Falling Off Terminal & Shorting Isolation Sys.Temporary Jumper Device Built to Prevent Recurrence.Blown Fuse Replaced (← links)
- 05000373/LER-1997-041, :on 971120,failure to Verify Thermal Limits Prior to Exceeding 25% Power During Unit Startups Prior to 1996 Due to Misinterpretation of TS Requirements.Procedure (LGP-1-1) Will Be Revised (← links)
- 05000373/LER-1997-002-01, Submits Solution to Accumulation of Snow on Control Room & Auxiliary Electric Equipment Room Ventilation Sys Filters During Heavy Snow Falls,In Lieu of Suppl LER as Stated in LER 97-002-01 (← links)
- 05000373/LER-1988-012-02, :on 880608,failure of Diesel Generator O to Satisfy Frequency Requirements Occurred.Caused by High Governor Oil Temp & Governor Speed Compensation Adjustment Problem.Speed Compensation Adjusted (← links)
- 05000373/LER-1988-026-02, :on 881105,spurious Ammonia Detector Trip Due to Design Deficiency in Chemcassette Tape Mechanism.Caused by Jammed Chemcassette Tape in Detector Unit.Chemcassette Tape Unbound & Realigned & Detector Reset (← links)
- 05000373/LER-1988-025-02, :on 881103,spurious Ammonia Detector Trip Due to Failure of Chemcassette Tape Drive Motor.Caused by Design Deficiency of Chemcassette Tape Mechanism.Drive Motor Assembly & Chemcassette Tape Replaced (← links)
- 05000373/LER-1988-002-03, :on 880316,Type B & Type C Total Leakage Exceeded 0.6 La During Leak Rate Testing.Caused by Excessive Leakages.Corrective Actions Include Installment of New Disc Listed in Table 1 (← links)
- 05000373/LER-1987-037-01, :on 871213,RWCU Suction Isolation Valve Closed on Hi Filter/Demineralizer Inlet Temp.Caused by Inoperable Capacitor in Temp Switch Trip Circuit.Switch Repaired & Put Back in Svc (← links)
- 05000373/LER-1988-008-05, :on 880517,reactor Protection Sys (RPS) Bus B Tripped.Caused by Short to Ground During Jumper Installation RPS Motor Generator Set Restored to Operable Status & Rubber Boots Provided to Cover Free End of (← links)
- 05000373/LER-1988-021-02, :on 880928,ESF Actuation Occurred Resulting in Partial Isolation of Primary Containment & Loss of Reactor Protection Sys Bus B.Caused by Wire Guard Falling on Breaker Stabs.New Breaker Installed (← links)
- 05000373/LER-1988-022-01, :on 881013,control Room HVAC Sys B Ammonia Detector Tripped.Caused by Design Deficiency in Chemcassette Tape Mechanism.Chemcassette Tape Realigned in Spool Mechanism.Detector Reset & Returned to Svc (← links)
- 05000373/LER-1986-013-02, :on 860403,overcurrent Relay for Sys Auxiliary Transformer Inadvertently Tripped Causing Loss of Offsite Power to Bus 141Y.Caused by Personnel Error.Personnel Will Be Trained (← links)
- 05000373/LER-1986-012-03, :on 860402,ESF Actuation of Control Room HVAC Emergency Makeup Train a Started by Spurious Trip of High Radiation Monitor.Caused by Lack of Source Calibr of Monitor.Monitor Calibr & Procedure Revised (← links)
- 05000373/LER-1986-014-01, :on 860412,Control Room a HVAC Sys Ammonia Detector OXY-VC125YA Tripped Spuriously,Causing ESF Damper Actuation.Caused by Broken Tape Carriage Mechanism in Chemcassette Unit.Tape Adjusted & Wound Back (← links)
- 05000373/LER-1986-002-01, :on 860120,Wyle Lab Test Results Determined That Main Steam Safety Relief Valves E,H & U Failed to Meet Setpoint Tolerance Per Tech Specs.Caused by Seat Leakage. Valve Setpoints Adjusted to Nameplate (← links)
- 05000373/LER-1988-019-03, :on 880829,diesel Generator 1B Output Breaker Acb 1433 Failed to Close Onto Dead Bus within 13 Tech Spec Limit.Caused by Failure of Diesel Generator to Close on First Attempt.Output Breaker Replaced (← links)
- 05000373/LER-1988-017-04, :on 880821,control Room HVAC Sys B Ammonia Detector a Tripped.Maint Dept Found Takeup Spool Drive Motor Had Jammed.Caused by Design Deficiency in Chemcassette Tape Mechanism.Tech Spec Amend Request Submitted (← links)
- 05000373/LER-1988-018-04, :on 880822,O Diesel Generator Cooling Pump Motor Failure Caused by Overheating Due to Failed Breaker. Motor & Breaker Replaced,Testing Completed & Sys Declared Operable (← links)
- 05000373/LER-1988-006-06, :on 880330,continuous Conductivity Monitor for Reactor Water Samples Declared Inoperable.Caused by Vessel Draindown for Chemical Decontamination.Vessel Flooded Up After Decontamination Work & Svc Resumed (← links)
- 05000373/LER-1988-004-09, :on 880422,reactor Protection Sys (RPS) Bus a Tripped.Caused by Improper Installation of 1C51B-K1 Relay at 1H13-P608 Panel by Instrument Maint Technician.Rps MG Set a Restored to Operable Status (← links)
- 05000373/LER-1988-005-05, :on 880422,diesel Generator 1A Failed to Meet Load Acceptance Criteria & Declared Inoperable.Caused by Difference in Tolerance Between Fuel Racks & Newly Installed Fuel Injectors & Insufficient Speed Setting (← links)
- 05000373/LER-1986-004-02, :on 860205,control Room HVAC Sys Ammonia Detector Tripped Spuriously.Caused by Broken Chemcassette Tape in Tape Carriage Mechanism.Chemcassette Tray Replaced & Vaporizer Concentrate Sys Declared Operable (← links)
- 05000373/LER-1986-003-02, :on 860122,reactor Water Sampled for Ph.Sample Point Had No Flow Next Time Surveillance Scheduled.Work Request Written.No Sample Obtained Until 860126.Caused by Personnel Error.Technicians Will Be Retrained (← links)
- 05000373/LER-1986-002-06, :on 860120,safety Relief Valves 1B21-F013E,H & U Exceeded Set Pressure Tolerance in Tech Spec 3/4.4.2. Caused by Seat Leakage for Valves 1B21-F013E & U.Setpoints Adjusted & Returned to Util for Installation (← links)
- 05000373/LER-1998-016-02, :on 980823,APRM Reactor Scram & Rod Block Setpoints Found to Be non-conservative After Calibr Due to Human Performance Error.Flow Converter Correctly Calibr in Accordance with Procedure LIS-NR-107 (← links)
- 05000373/LER-1998-015-02, :on 980819,manual Reactor Scram Occurred Following Level Control Transient.Caused by Failure of Control Card Associated with Bailey Rwl Cs.Replaced Failed Card with Refurbished Unit.With (← links)
- 05000373/LER-1986-001-03, :on 860110,control Room HVAC Sys Ammonia Detector Tripped,Causing ESF Actuation.Caused by Master Fault Due to Misaligned Gate Assembly or Dirty Photo Cell. Detector Reset & Mechanism & Optics Cleaned (← links)
- 05000373/LER-1988-003-10, :on 880325,two Intermediate Range Monitors Inoperable During Operational Condition Five.Caused by Personnel Error,Poor Administrative Controls & Procedures. Corrective Action:Procedure Implemented (← links)
- 05000373/LER-1998-013-01, :on 980817,reactor Water Cleanup Isolations Occurred Due to Inadequate Operating Procedure Guidance. Caused by Human Error.Revised Operating Procedures for RT Sys (← links)
- 05000373/LER-1988-003-08, :on 880325,two Inoperable Intermediate Range Monitors Found During Refuel.Caused by Personnel Error,Poor Administrative Controls & Procedural Inadequacy.Functional Surveillance on Range Monitors Performed (← links)
- 05000373/LER-1997-023, :on 970626,inadequate Channel Functional Testing of RPS Was Noted.Caused by Procedure Deficiencies. Revised Procedures & Appropriate Testing Has Been Completed. with (← links)
- 05000373/LER-1988-015-04, :on 880712,RCIC Turbine Remotely Tripped to Satisfy Surveillance Prerequisite.Caused by Insufficient Engagement of Trip Linkage.Work Request Initiated to Repair Linkage & Overspeed Trip Linkage Repaired (← links)
- 05000373/LER-1985-069-01, :on 851130,LMS-FP-15, Monthly Insp of Tech Spec Fire Hose Stations Not Performed within Time Interval Specified by Tech Specs.Caused by Personnel error.LMS-FP-15 Completed & Foremen Reprimanded (← links)
- 05000373/LER-1985-068-01, :on 851124,attempt Made to Start RHR Sys a in Shutdown Cooling Mode,Causing Isolation Due to High Flow. Caused by RHR Sys Not Being in Svc for Several Wks.Sys Refilled & Vented Per LOP-RH-06 (← links)
- 05000373/LER-1988-014-03, :on 880403,safety-related Snubbers Failed to Meet Functional Test Acceptance Limits.Causes Listed. Snubbers Dismantled & Inspected & Replaced (← links)
- 05000373/LER-1988-002-09, :on 880316,Type B & C Total Leakage Exceeded 0.6 La During Leak Rate Testing.Cause Undetermined.Valves Repaired as Necessary (← links)
- 05000373/LER-1988-011-06, :on 880601,feeder Breaker Inadvertently Tripped When Contractor Working in Area Bumped Breaker W/Cart.Caused by Lack of Awareness of Equipment Around Work Area.Temporary Plywood Panels Placed Over Breakers (← links)
- 05000373/LER-1997-025, :on 970613,erroneous Determination of RHR Sys Pump Operability Resulted in Operation Outside of TS Requirements Due to Personnel Error.Shift Manager Was Counseled (← links)
- 05000373/LER-1987-039-01, :on 871216,RCIC Sys Declared Inoperable When Water Leg Pump Seized.Cause Unknown.Rcic Water Leg Pump Replaced,Tested & Declared Operable on 871217 (← links)
- 05000373/LER-1996-010, :on 960829,violations of TS & Design Basis Occurred.Caused by Inadequate Standards for TS Clarification.Deleted Clarifications in Question on 960829 & Revised One Clarification (← links)
- 05000373/LER-1997-003, :on 970213,4.16 Kv Switchgear Breakers Were Found to Be Racked in Seismically Unqualified Positions Resulting in Condition Outside Design Basis.Caused by Inadequate Procedure.Walkdown Performed (← links)
- 05000373/LER-1997-021, :on 970512,undrainable Low Areas in Drywell Floor Resulting in Degradation of Leak Detection Sys Due to Increased Delays in Detection of Unidentified Leakage. Declared Leak Detection Sys Inoperable (← links)
- 05000373/LER-1987-041-01, :on 871222,control Room HVAC Sys B Ammonia Detector Trip Occurred Due to Chemcassette Out of Tape. Caused by Procedural Weakness.Chemcassette Replaced & Procedures Revised (← links)
- 05000373/LER-1988-001-09, :on 880222,RCIC Discovered That High Level Instrument 1B21-N101A Out of Tolerance,Per Tech Specs.Caused by Stripped Setpoint Locking Mechanism Screw.Temporary Sys Change Installed to Use Alternate Switch (← links)
- 05000373/LER-1987-038-01, :on 871216,reactor Scrammed on Low Reactor Water Level Due to Feedwater Heater 12C String Isolations. Caused by Design Deficiency in Feedwater Heater 11C.Mods Scheduled to Install Continuous Operating Vent (← links)
- 05000373/LER-1997-004-02, :on 970214,discovered That Incomplete Understanding of Engineered Safety Features Occurred.Caused by Incomplete Understanding of Verbatim Requirements of Ts. TS Change Submitted (← links)
- 05000373/LER-1997-003-03, :on 970213,inadequate Procedure for Racking 4.16 Kv Switchgear Breakers Results in Seismically Unqualified Condition Outside Design Basis.Caused by Incomplete Procedures.Procedures Revised (← links)
- 05000373/LER-1987-040-01, :on 871218,diesel Generator 1A Output Breaker Failed to Close.Caused by Failure of Contact on 27X Relay to Close & Make Contact.Relay Replaced & LOS-DG-M2 Reperformed (← links)
- 05000373/LER-1997-015-01, :on 970430,identified Potential for Diversion of Low Pressure Coolant Injection Flow to Suppression Pool Due to Manual Override Logic.Caused by Inadequate Design. Alerted Personnel of This Condition (← links)
- 05000373/LER-1997-019, :on 970422,post LOCA Hydrogen Analyzers Did Not Monitor to 10% as Stated in Ufsar.Caused by Ineffective Design Control.Declared Containment Hydrogen Analyzers Inoperable & Placed on Degraded Equipment Log (← links)
- 05000373/LER-1997-018, :on 970421,fire Protection Carbon Dioxide Suppression Sys Declared Inoperable.Caused by Human Performance Problems During Initial Const.Fire Watches Immediately Established (← links)
- 05000373/LER-1986-011-03, :on 860317,Group 4 Primary Containment Isolation Occurred.Caused by Personnel Error.Investigation of Incident Conducted.Operator Involved Counseled on Importance of Attention to Detail (← links)
- 05000373/LER-1997-002, :on 970203,main Control Room & Auxiliary Equipment Room Ventilation Sys Was Found Outside of Design Basis.Caused by Inadequate Initial Design.Operating Procedures Will Be Revised (← links)
- 05000373/LER-1997-016, :on 970414,rod Block Monitor Were Not Adequately Functionally Tested as Required by Ts.Caused by Inadequate Procedures.Affected Procedures Will Be Revised & Performed Prior to Plant Restart (← links)
- 05000373/LER-1997-014, :on 970415,drywell/SP Vacuum Breaker Isolation Valve Packing Was Not Locally Leak Tested Due to Personnel Error.Evaluation of Primary Containment Penetrations/ Isolation Valves Has Been Completed (← links)
- 05000373/LER-1997-022, :on 970529,minimum Shift Manning Was Not Met. Caused by Ineffective Tracking of Active License Maintenance Requirements.Proper Criteria Applied to Proficiency Records from First Quarter 1997 (← links)
- 05000373/LER-1997-012, :on 970410,low-low Setpoint Function of Ms S/R SRVs Have Not Been Tested IAW TS Sr.Caused by Inadequate Procedure.Procedures Revised to Functionally Test LLS Logic & ADS Logic (← links)
- 05000373/LER-1997-017, :on 970416,deficiencies Identified in ASME Testing of RHR Pump Sp Spray Flow Using Instruments Were Not Included in Calibration Program Due to Mgt Deficiency.Caused by Change to Sp.Procedure Change Issued (← links)
- 05000373/LER-1997-013, :on 970320,identified Concern Regarding LaSalle Electrical Surveillance Isolation Logic Sys Functional Test. Caused by Misinterpretation of TS Surveillance Requirement 4.3.2.2.Procedures Revised (← links)
- 05000373/LER-1997-011, :on 970318,source Range Monitor Detector Retract Permit Enabled Lower than Allowed by TS Due to Nonconservative Setpoint in Inadequate Procedure.Setpoint Determination Was Performed (← links)
- 05000373/LER-1986-006-03, :on 860218,w/RWCU Sys Out of Svc & Reactor Recirculation Sys Sample Line Plugged,Continuous Conductivity Monitor Rendered Inoperable.Caused by Misunderstanding of Tech Specs (← links)
- 05000373/LER-1986-005-05, :on 860217,while Uncrosstieing Div I Dc Buses, ESF Actuation Occurred Due to Loss of Dc Power to Div I Buses 111X & 111Y.Caused by Personnel Error.Personnel Retrained (← links)
- 05000373/LER-1997-007, :on 970225,functional Test of Pressure Switches on Unit 1A RHR Pump Discharge Line Identified as Past Due. Caused by Inadequate Validation & Verification of Instrument Surveillance Program.Program Data Corrected (← links)
- 05000373/LER-1985-067-01, :on 851120,control Room Ventilation/Auxiliary Electric Equipment Room Ventilation Sys Chlorine Detector B Spuriously Alarmed.Cause Undetermined.Detector Reset (← links)
- 05000373/LER-1996-015, :on 961126,declared Diesel Driven Fire Suppression Pumps Inoperable Due to Misinterpretation of Ts. Will Change Frequency for Performing Maint to Correspond W/ TS Frequency (← links)
- 05000373/LER-1985-063-01, :on 851008,control Room HVAC Chlorine Detector B Tripped & Would Not Reset.Caused by Lower than Normal Electrolyte Drip Rate.Proper Drip Rate & Local & Control Room Alarms Restored (← links)
- 05000373/LER-1985-064-01, :on 851014,spurious Trip of Ammonia Detector B Resulted in ESF Actuation.Cause Unknown.Detector Reset (← links)
- 05000373/LER-1985-066-01, :on 851105,local Leak Rate Test Performed on Inboard Feedwater Check Valve 1B21-F010B.Leakage of 1,982 Scfh Observed,Exceeding 0.6 La Limit.Cause of Failure Unknown.Complete Insp to Be Made (← links)
- 05000373/LER-1997-009, :on 970311,determined Lake Level Higher than Max Level Described in Ufsar.Caused by Inadequate Knowledge & Consideration of Design Basis of Max Lake Level.Revised Operating Procedures & Will Review UFSAR (← links)
- 05000373/LER-1984-015-08, :on 840227,Groups II & IV Isolations Occurred. Caused by Installation of Mod M-1-1-83-045 Adding MSIV Group I Automatic Closure Relay Alarm Logic.Mod Terminated, Problem Corrected & Isolation Reset (← links)
- 05000373/LER-1996-012, :on 961010,determined as-found Condition of Auxiliary Electric Equipment Room May Not Be Habitable During Design Basis Event.Caused by Failure to Implement Design Basis Requirements.Duct Replaced (← links)
- 05000373/LER-1997-005-02, :on 970220,potential Loss of Both Trains of SGTS & Containment Pressure Suppression During First 10 Seconds of LOCA Noted Due to Deficiencies in Original Design Analysis & Procedures.Design Review Performed (← links)
- 05000373/LER-1997-006-01, :on 970221,DG Testing Did Not Meet Surveillance Requirements,Due to Misinterpretation of Tech Specs. Surveillance Procedures for DG LOCA Load Sequence Testing Being Reviewed (← links)
- 05000373/LER-1985-055-01, :on 850722,hydraulic Surge Resulted When Manual Stop Valve for Standby Liquid Control Opened to Relieve Pressure After Hydrostatic Test.Caused by Defective Procedure.Procedure Will Be Revised (← links)
- 05000373/LER-1985-047, :on 850610,hydrogen Concentration Samples of Offgas Sys Collected at Incorrect Location.Caused by Poor Communication Between Operations Personnel.Sample Location Revised (← links)
- 05000373/LER-1985-061-01, :on 850814,diesel Generator 1A Not Run within 1 H of Generator 2A Being Declared Inoperable.Caused by Difficulty in Interpreting Tech Spec Requirements.Diesel Generator 1A Run & Tech Spec 3.8.1 Revised (← links)
- 05000373/LER-1985-060-01, :on 850813,ammonia & Chlorine Detectors for Train a of Control Room/Auxiliary Electrical Equipment Room HVAC Sys Tripped.Caused by Momentary Loss of Power to Sys. Power Restored (← links)
- 05000373/LER-1984-014-08, :on 840301,while Performing Electrical Surveillance LES-R1-01,electrical Jumper Installed in Incorrect Panel,Causing Reactor Recirculation Pump Trip. Caused by Procedure Error.Jumper Removed (← links)
- 05000373/LER-1997-002-03, :on 970203,main Control Room & Auxiliary Equipment Room Ventilation Sys Found Outside Design Basis Due to Inadequate Initial Design.Will Perform Analysis to Determine Whether Sys Was Capable of Function (← links)
- 05000373/LER-1996-016-03, :on 961106,discovered Hot Short Could Result in Damage to MOVs Required for Safe Hot Shutdown.Caused by Failure to Recognize Potential for Mechanical Valve Damage from Hot Shorts & Design Deficiency (← links)
- 05000373/LER-1996-017-04, :on 961106,main CR Found Outside of Design Basis Due to Inadequate TS Surveillance Procedure.Caused by Failure to Fully Implement Design Basis Requirements. Required Tests,Analysis & Mods Implemented (← links)
- 05000373/LER-1996-018-02, :on 961104,determined That RHR Pump Seal Coolers Do Not Meet Design Pressure Requirements.Caused by Inadequate Design Info from Vendor.Replaced Casings (Shell Side) W/Casings W/Design Pressure of 15 Psig (← links)
- 05000373/LER-1984-016-07, :on 840307,instruments 1B21-N431B & 1B21-N413D Isolated During Performance of LIS-NB-115 & Not Returned to Svc.Caused by Personnel Error.Verification of Valves Covered by LIP-GM-35 Performed (← links)
- 05000373/LER-1985-058-01, :on 850817,pressure Transient in Instrument Ref Line Actuated.Caused by Valving in of Differential Pressure Switch Instrument Ref Line While at Reactor Pressure by Instrument mechanic.w/850830 Ltr (← links)
- 05000373/LER-1985-059-01, :on 850807,spurious Actuation of Control Room B Ventilation/Auxiliary Electric Equipment Room Ventilation Sys Chlorine Detector OAE-VCO91B Occurred.Cause Not Determined.Chlorine Detector Reset (← links)
- 05000373/LER-1996-011-02, :on 960928,less than Adequate Pneumatic Valves Resulted in Inadequate Valve Closing Forces Which May Affect Containment Isolation.Lasalle Is Implementing Design Change Packages to Compensate for Reduced EDA (← links)
- 05000373/LER-1996-008-01, :on 960628,all Cscs,Eccs & DGs Declared Inoperable Due to Foreign Matl Injected Into Svc Water Tunnel.Caused by Inadequate Work Control.Tunnel Cleaned & Inspected,Floor & Wall Repair Work Stopped (← links)
- 05000373/LER-1996-014-05, :on 961030,480 Volt Safety Related Switchgear Breakers in Degraded Condition Due to Untimely Implementation of Previous Corrective Actions.Work Requests 960101523 & 960101525 Written for Repairs (← links)
- 05000373/LER-1985-056-01, :on 850803,control Room Vent Radiation Monitor B Spurious High Trip Initiated Emergency Makeup Train A. Caused by Radio Interference.Radiation Monitor Trip Reset & Emergency Makeup Train Shut Down (← links)
- 05000373/LER-1996-021, :on 961217,inadequate Review of Mod of Main Control Room Atmospheric Control Sys Radiation Monitoring Logic Resulted in Unreviewed Safety Question.Se for Mod Was Performed in Sept 1992 (← links)
- 05000373/LER-1996-013-05, :on 961016,determined That Some of Current TS Requirements for Fuel Oil Analyses Were Not Being Met.Caused by Mgt Deficiency.Assigned Offsite Lab to Analyze Fuel Oil & Revised Procedure LOS-DO-SR2 (← links)
- 05000373/LER-1996-012-05, :on 961010,auxiliary Electric Equipment Room Was Found to Not Meet GDC 19 Habitability Requirements Due to Failure to Understand Design & Licensing Basis.Ufsar Conformance Review Is Being Implemented (← links)
- 05000373/LER-1997-001-02, :on 970108,special Rept Was Not Written as Required by TS When Loose Parts Monitoring Sys Was Inoperable During Power Operations.Automatic Recording Capability Will Be Installed on Unit Lpms (← links)
- 05000373/LER-1985-053-01, :on 850717,RHR Shutdown Cooling High Suction Flow Switches 1E31-NO12AA/AB/BA/BB Discovered Piped in Reverse of Sys Design & Inoperable.Caused by Failure to Revise Design Drawing.Drawing & Piping Revised (← links)
- 05000373/LER-1996-011-06, :on 960928,pneumatic Valves W/Less than Designed Effective Diaphragm Area Results in Inadequate Valve Closing Forces Which May Affect Containment Isolation. Caused by Incorrect Effective Diaphragm Area (← links)
- 05000373/LER-1985-054-01, :on 850718,process Radiation Monitors Registered off-scale High,Actuating Control Room Emergency Makeup Filter Train B.Caused by Defective Procedure. Procedure Revised & Submitted for Approval (← links)
- 05000373/LER-1996-021-03, :on 961217,identified Inconsistency Between TS Clarification Re Main Control Room Atmospheric Control Sys (Mcracs) Radiation Monitoring Sys & TS 3.4.7.1.Caused by Inadequate Review.Will Issue Supplemental LER (← links)
- 05000373/LER-1996-020-04, :on 961217,discovered Div 2 Piping Supplying RHR Heat Exchanger Out of Design Basis.Cause Indeterminate. Installed Keep Fill Sys to Eliminate Potential for Water Hammer During Design Basis Events (← links)
- 05000373/LER-1996-022-03, :on 961213,determined That Thermal Overload Protection Devices for RHR Valves Were Not Bypassed.Caused Indeterminate.Implemented Design Changes to Revise Thermal Overload Bypass Circuit (← links)
- 05000373/LER-1996-019-04, :on 961210,RHR Sys Containment Spray Isolation Valves Not Tested IAW ASME Section XI Requirements.Caused by Personnel Error.Procedure LOS-RH-Q2 Revised to Test CS Isolation Valves IAW IST Program (← links)
- 05000373/LER-1985-051-01, :on 850627,alarm Received for High Chlorine/ Ammonia Concentration for Train B of Control Room/Auxiliary Electrical Equipment Room HVAC Sys.Caused by Spurious Alarm from Chlorine Detector.Chlorine Detector Reset (← links)
- 05000373/LER-1985-052-01, :on 850629,during Preparation for Routine Maint,Crd Pump a Tripped on Low Suction Pressure When CRD Pump B Shut Down.Caused by Failure of CRD Pump B Discharge Stop Check Valve to Close.Valve Repaired (← links)
- 05000373/LER-1985-050-01, :on 850626,alarm Received for High Chlorine/ Ammonia Concentration on Train a of Control Room/Auxiliary Electrical Equipment Room HVAC Sys.Caused by Jammed Tape in Ammonia Detector Chemcassette Mechanism (← links)
- 05000373/LER-1985-049-01, :on 850625,chlorine Detector Actuation Occurred Resulting in ESF Damper Operations to Isolate Vital Control Areas of Plant from Outside Air.Caused by Debris in Glass Orifice of Chlorine Detector for Vc/Ve Train B (← links)
- 05000373/LER-1996-015-04, :on 961126,misinterpretation of TS Surveillance Resulted in Inoperable Diesel Driver Fire Suppression Pumps. Svc Water Sys Was Established as Backup Fire Suppression Water Sys IAW Abnormal Procedures LOA-FP-101 (← links)
- 05000373/LER-1984-045, :on 840715,reactor Water Cleanup Sys C Isolated on High Differential Flow.Caused by Improper Positioning of Ball Valves Resulting in Partial Draining of Filter/ Demineralizer.Sign Re Valve Positioning Posted (← links)
- 05000373/LER-1984-043-01, :on 840627,reactor Water Cleanup Sys a Isolated on High Differential Flow.Caused by Improper Positioning of Ball Valves Resulting in Partial Draining of Filter/ Demineralizer.Sign Re Valve Positioning Posted (← links)
- 05000373/LER-1985-062-01, :on 850823,chlorine Detectors for Train B of Control Room/Auxiliary Electrical Equipment Room HVAC Actuated.Possibly Caused by Radiofrequency Interference. Signs Posted Prohibiting Use of Radios (← links)
- 05000373/LER-1985-048-01, :on 850614,sample of RHR a Svc Water Not Obtained to Meet Sampling Requirements of Tech Specs.Caused by Lack of Communication Between Rad Chem & Operating Depts. Memo for Radchem Dept Re Communication Issued (← links)
- 05000373/LER-1996-010-06, :on 960829,determined Conditions Outside of Design Basis.Caused by Inadequate Standards for TS Clarifications.Implemented Development of TS Clarifications & Evaluates TS Interpretations (← links)
- 05000373/LER-1985-040-01, :on 850423 & 0505 Jammed Chemcassette Tape in Ammonia Detector B of Train a of Control Room/Auxiliary Electrical Equipment Room HVAC Triggered Alarms for High Chlorine/Ammonia Concentration (← links)
- 05000373/LER-1985-046-01, :on 850619,for Approx 15 Minutes,Neither Diesel Driven Fire Pump Available.Caused by Broken Alternator Belt on Fire Pump B During Fire Drill,While Pump a Out of Svc for Flywheel Replacement.Pump a Returned to Svc (← links)
- 05000373/LER-1985-047-01, :on 850610,four Samples of Hydrogen Concentration of Offgas Sys Collected at Incorrect Location Due to Confusion Re Which Prefilter in Operation.Sign Posted to Alert Personnel (← links)
- 05000373/LER-1985-037-01, :on 850417,Div II ADS lo-lo-lo Level Permissive Differential Pressure Switches Found Wired Incorrectly.Caused by Difference Between Wiring Diagram & Schematic for Environ Qualification (← links)
- 05000373/LER-1985-045-01, :on 850531,reactor Manually Scrammed.Caused by Failure of Circulating Pump 1B Discharge Valve Gear Operator Mounting Bolts.Stop Logs Placed in Intake Structure for Circulating Water Pump 1B (← links)
- 05000373/LER-1993-001-02, :on 930105,LPSI Pumps 1B & 1C & DG 1A Received Automatic Start Signal.Caused by Personnel Error.Instrument Maint Dept Will Be Tailgated on Event & Correct Reactor Level Verified (← links)
- 05000373/LER-1985-039-01, :on 850419,high Chlorine/Ammonia Concentration Alarm Received for Control Room/Auxiliary Electrical Equipment Room HVAC Train B.Caused by out-of-calibr Ammonia Detector.Ammonia Detector Recalibr (← links)
- 05000373/LER-1985-038-01, :on 850412,control Room Received High Chlorine/ Ammonia Concentration Alarm for Train a of Control Room/ Auxiliary Electric Equipment Room HVAC Sys.Caused by Broken Tape in Ammonia Detector Chemcassette (← links)
- 05000373/LER-1985-044-01, :on 850509,ESF Damper Actuations Occurred When Train B Control Room HVAC Sys Chlorine Detectors Alarmed. Probable Cause Is radio-frequency Interference.Action Item Record 373-200-85-00072 Written Re Problem (← links)
- 05000373/LER-1992-016-08, :on 921203,an Unplanned ESF Actuation Occurred During RPS Bus B Transfer Due to Personnel error.LAP-100-40 Will Be Evaluated to Enhance Proper Use of Procedure Format as Useful Tools to Avoid Mistakes (← links)
- 05000373/LER-1985-043-01, :on 850508,high Chlorine Detector Actuated for Train B of Control Room.Caused by False Actuation of One or Both Chlorine Detectors of Control Room/Auxiliary Electrical Equipment Room HVAC (Vc/Ve) Sys (← links)
- 05000373/LER-1985-042-01, :on 850505,high Chlorine/Ammonia Concentration Alarm Received for Control Room/Auxiliary Electrical Equipment Room HVAC Train B.Caused by Faulty Takeup Reel in Ammonia Detector.Detectors Returned to Svc (← links)
- 05000373/LER-1992-015-07, :on 921201,Buses 141X & 141Y Crosstie Breaker (1415) Mistakenly Opened,Causing Loss of Bus 141Y Due to Personnel Error.Nuclear Station Operator Disciplined.W/ (← links)
- 05000373/LER-1985-041-01, :on 850505,fan OVC03CA for Emergency Makeup Train a of Control Room Auxiliary Electrical Room HVAC Started for No Apparent Reason.Cause Undetermined.Trip Reset & Fan Secured (← links)
- 05000373/LER-1992-013-07, :on 921114,DG 1A Automatically Started While Disconnecting Test Equipment at Completion of Instrument Procedure.Caused by Actuation of Rosemount Level Transmitters.Dg Shut Down (← links)
- 05000373/LER-1992-014-06, :on 921111,Reactor Bldg 673 Elevation Watertight Door Discovered Tied Open Due to Personnel Error. Health Physics Dept Will Walk Down All Unlocked High Radiation Area Access Points (← links)
- 05000373/LER-1996-006-03, :on 960512,Unit 1 Manual Scram Occurred Due to High Vibration on Main Turbine Generator exciter.Re-bored Oil Deflectors to Obtain Proper Clearance W/Exciter Shaft & Reinstalled (← links)
- 05000373/LER-1985-035-01, :on 850411,main Turbine Tripped from Bearing 11 High Vibration Signal,Causing Reactor Scram.Probable Direct Cause Was Loose Connection,Aggravated by Slight Vibration Detector Miscalibration & Imbalance (← links)
- 05000373/LER-1996-009-05, :on 960802,TS Surveillance Missed on Primary Containment Manual Valve.Caused by Inadequate Onsite Review of Amendment 63 to Fsar.Four Manual Isolation Valves on Each Unit Were Locked Closed (← links)
- 05000373/LER-1996-005-02, :on 960423,missed Tech Spec Surveillance LOS-PP-W1.Caused by Human Performance Error.Issued Directive to Control Room Supervisors Requiring Use of Predefined Detail Report (← links)
- 05000373/LER-1985-036-01, :on 850403,RHR Inboard Shutdown Cooling Suction Isolation Valve 1E12-F009 Isolated.Caused by Spurious Pressure Spike.Pressure Snubbers Installed & Upgrades for Environ Qualification Reviewed (← links)
- 05000373/LER-1985-033-01, :on 850402,noble Gas Grab Sample Not Obtained During Standby Gas Treatment Sys Run,Per Tech Spec 4.11.2.1.2.Caused by Personnel Error.Reminder to Operator Re Sample Collection Placed in Control Room (← links)
- 05000373/LER-1992-012-07, :on 921102,required TS Fire Watch of 690-ft Elevation of Offgas Bldg Not Performed.Caused by Miscommunication Between Individuals Performing Fire Watch During Turnover.Fire Watch Performed (← links)
- 05000373/LER-1985-031-01, :on 850311,while Discharging Radwaste,Sys Isolated on High Road Signal.Caused by Misreading of Max Allowable hi-hi Alarm/Trip Setpoint from Chart Recorder.Addl Training Instituted (← links)
- 05000373/LER-1985-034-01, :on 850330,RHR Sys Shutdown Cooling Inboard Isolation Valve 1E12-F009 Isolated Four Times.Possibly Caused by Environmentally Qualified Pressure Switches W/O Pressure Snubbers.Pressure Snubbers Installed (← links)
- 05000373/LER-1992-011-07, :on 921015,wrong High Radiation Door Downgraded Due to Personnel Error,Resulting from Initial Typing of High Radiation Area Door List.Physical Control of Door 136 Established & Door Properly Posted (← links)
- 05000373/LER-1985-030-01, :on 850325,both Ammonia Detectors for Train a Control Room/Auxiliary Electrical Equipment Room HVAC Sys Alarmed While Facility in Cold Shutdown.Caused by Loss of Power to Vc/Ve Sys.Alarms & Dampers Reset (← links)
- 05000373/LER-1985-028-01, :on 850327,reactor Scram Occurred While Unit in Hot Shutdown.Caused by Low Reactor Vessel Level Resulting from Opening of Safety Relief Valves During Leak Test.Rhr Sys Started (← links)
- 05000373/LER-1996-008-05, :on 960628,foreign Matl Injected Into SW Tunnel Caused Dual Unit Shutdown Due to Inadequate Work Control. Floor & Wall Repair Work in Lake Screen House Was Stopped (← links)
- 05000373/LER-1992-010-02, :on 921009,Unit 1 Automatic Reactor Scram Occurred Due to Low Charging Header Pressure.Discussed Event & Importance of Step by Step Procedure Adherence as Well as Need to Use self-checking Methods (← links)
- 05000373/LER-1985-029-01, :on 850321,scram Occurred When Instrument 1B21-N038A Level 3 Automatic Depressurization Sys Confirmatory Level Switch Incorrectly Valved Into Svc. Caused by Personnel Error.Training Initiated (← links)
- 05000373/LER-1996-007-06, :on 960626,full MSIV Isolation Was Received on Unit 1 During Instrument Maint Dept Instrument Mechanics Performance.Caused by Instrument Maint Dept Work Practice Deficiency.Procedures Have Been Changed (← links)
- 05000373/LER-1985-027-01, :on 850313,gate Which Secures Radwaste Filter Aisle High Radiation Area Found Unsecured & Unattended. Caused by Radwaste Foreman Leaving Gate Open.Radwaste Foreman Counseled (← links)
- 05000373/LER-1985-026-01, :on 850313,shutdown Cooling Header Pressure Switch Not Tested within Allowable Time Limits.Caused by Error in Identifying Proper Switch to Meet Tech Spec Requirements.New Requirements Added to Program (← links)
- 05000373/LER-1992-009-07, :on 920923,CR Ventilation Train Received Spurious Trip Signal from B Process Radiation Monitor Due to High Radiation Spike.Detector B Adjusted & Limited Procedure LLP-92-159 Implemented (← links)
- 05000373/LER-1984-087, :on 841222,HPCS Pump Suction Valve to Suppression Pool Opened While Normal Suction Valve to Cycled Condensate Tank Closed.Caused by High Suppression Pool Level Due to Valve Cycling & Leakage (← links)
- 05000373/LER-1984-091, :on 841220,train B ammonia-chlorine Alarm Tripped.Caused by Broken Chemcassette Tape.Chemcassette Replaced W/New Tape & Detector Reset (← links)
- 05000373/LER-1984-089-01, :on 841225,high Ammonia Alarm Received in Control Room Ventilation/Auxiliary Electric Equipment Room Ventilation Sys.Cause Could Not Be Determined.Alarm Reset (← links)
- 05000373/LER-1985-009, :on 850122,no Assigned Calibr or Functional Test Procedure for Calibr RHR Shutdown Cooling Suction Pressure Switch.Caused by Improper Identification on Tech Spec Surveillance Matrix.Procedure Drafted (← links)
- 05000373/LER-1985-024-01, :on 850303,reactor Scram Occurred,Resulting from Turbine Control Valve Fast Closure.Caused by Offsite Fault on 345-kv Transmission Line 0101.Lines 0101 & 0104 Inspected (← links)
- 05000373/LER-1985-022, :on 850222,RCIC Received Div 1 & 2 Isolation Signals on High RCIC Steam Line Flow.Caused by Release of Steam at Reactor Pressure Into RCIC Steam Line from Piping Between RCIC in- & Outboard Isolation Valves (← links)
- 05000373/LER-1984-088, :on 841212,misapplication of Pipe Thermal Expansion Design Criteria Discovered in Two Areas Creating Potential for Thermal Overstress.Caused by Error in Thermal Expansion Analysis.Reanalysis Performed (← links)
- 05000373/LER-1985-015-01, :on 850217,vacuum Breaker C Opened & Closed. Caused by Differential Pressure.Procedures Revised (← links)
- 05000373/LER-1984-086, :on 840927,liquid Radwaste Discharge Batch 45-84 Discharged to Illinois River W/Nonconservative Process Radiation Monitor hi-hi Trip Setpoint.Caused by Failure to Lower Monitor Setpoint (← links)
- 05000373/LER-1984-085, :on 841129,rev to LOA-FW-01 (Loss of Feedwater Heater) Made Due to Determination That Present Limit of 150 F Temp Change Caused by Loss in Feedwater Heating Nonconservative W/Respect to GE Analysis (← links)
- 05000373/LER-1996-004-04, :on 960412,Unit 1 B RPS MG Set Assembly & Inadvertently Set Breaker.Caused by Personnel Error.All Onsite Painting & Event Was Explained to Painters (← links)
- 05000373/LER-1985-008-01, :on 850202,exhaust Secondary Containment Isolation Dampers Inoperable.Caused by Failure of Solenoid Valves.Solenoid Valves Replaced (← links)
- 05000373/LER-1984-084, :on 841130,control Room HVAC Chlorine Detector Actuated.Caused by Undetermined Spurious Condition.Esf Reset & Instrumentation Tested Satisfactory (← links)
- 05000373/LER-1996-003-04, :on 960327,scram Signal Received Causing Single Control rod,50-43 to Fully Insert.Caused by Spurious Spike of H IR Neutron Monitor Channel & Degraded Signal Cable Shield & Connector.Scram Reset & H IRM Bypassed (← links)
- 05000373/LER-1984-075, On 841111,leak Discovered in Thermowell 1B33-NO 23B.Caused by Mechanical Fatigue Due to Turbulent Flow Conditions.Thermowell & Resistance Temp Device Replaced.Insp Will Be Performed During Outage (← links)
- 05000373/LER-1984-064-01, :on 841004,feedwater Inboard Check Valve 1BZ1-FO10A Not Fully Seated.Caused by Wedged Hinge Pin Bushing Between Disc Antirotation Weld & Shoulder.Bushings Replaced (← links)
- 05000373/LER-1996-002-08, :on 960323,TS Required Fire Watch Missed.Caused by Personnel Error & Breakdown in Communications Between Sys Engineers & Fire Watch Group.Fire Watch Staff Counseled & Retrained (← links)
- 05000373/LER-1984-062-01, :on 840930,shutdown Cooling Suction Inboard Isolation Valve 1E21-F009 Failed to Open.Cause Unknown. Personnel Trained on Correct Procedure for Declutching Motor Operators (← links)
- ML15041A830 (redirect page) (← links)
- 05000374/LER-2015-003, Regarding Reactor Recirculation Loop Discharge Isolation Valve Vent Line Leak Due to Weld Defect (← links)
- 05000373/LER-2015-003, Regarding Secondary Containment Inoperable Due to Interlock Doors Open (← links)
- 05000374/LER-2015-002, Regarding Two Main Steam Safety Relief Valves Failed Inservice Inspection Pressure Test (← links)
- 05000374/LER-2015-001, Regarding High Pressure Core Spray Inoperable Due to Division 3 Diesel Generator Cooling Water Pump Casing Leak (← links)
- 05000373/LER-2015-002, Regarding Valve Control Power Breaker-Fuse Coordination Issue Results in Unanalyzed Condition (← links)