Reactor Enclosure Recirculation System# QUERYc6b85d30dd72fb2ef4cda49a405a9cf4
Reactor Enclosure Recirculation System
Reactor Enclosure Recirculation System# QUERY47bc2bc56d423c2bd2bc00a60e24c1ab
Reactor Enclosure Recirculation System# QUERY5a660ce033b5c09683d89fb7f202f07d
Reactor Enclosure Recirculation System# QUERY3af0445f38020847c6b0f5ca55e23df5
Reactor Enclosure Recirculation System# QUERY995e662ee46fcd8639419d654bce25a9
RS-17-137, Application to Revise Technical Specifications to Adopt TSTF-551, Revise Secondary Containment Surveillance Requirements
05000353/LER-1998-004, Forwards LER 98-004-00,reporting Manual Actions Taken in Response to Plant Conditions,To Perform Secondary Containment Isolation,Sgts Initiation & RERS Initiation
RS-22-049, Constellation Energy Generation, LLC, Supplemental Information to Correct Typographical Errors in Constellations Application to Revise Technical Specifications to Adopt TSTF-541 Revision 2, Add Exceptions to Surveillance Requirements for V
05000352/LER-1989-009, :on 890331,determined That One Channel of Secondary Containment Isolation Sys,Standby Gas Treatment Sys,Reactor Encl Recirculation Sys & NSSS Sys Inoperable. Caused by Personnel Error.Procedure Revised
05000352/LER-1989-028, :on 890424,reactor Encl Ventilation Sys Inoperable Beyond Tech Spec Limits.Caused by Tavis Corp Providing Incorrect Info About Actions Needed to Ensure That Transmitters Operated within Required Accuracy
05000352/LER-1989-034, :on 890512,certain Excess Flow Check Valve Test Valves Would Not Remain Leak Tight During post-DBA Conditions.Caused by Inadequate Review of Sys Design Specs. All 19 Test Valves Removed
05000352/LER-1987-065, :on 871121,reactor Encl Ventilation Isolation Occurred.Caused by Low Differential Pressure.Isolation Reset & Normal Reactor Encl Ventilation Restored.No Adverse Consequences
05000352/LER-1987-062, :on 871114,reactor Encl Isolation Occurred. Caused by Personnel Error When Operator Changed Operating Lineup of Reactor Encl Ventilation Fans.Operator Counseled & Operator Aid Posted at Exhaust Control Panel
05000352/LER-1987-064, :on 871121,reactor Encl Ventilation Isolation & Nssss Isolation Occurred.Caused by Series of Events Re Loss of Auxiliary Steam Boilers.Plant Heating Sys Restored & Isolation Reset
05000352/LER-1987-059, :on 871023,reactor Encl Isolated on Low Differential Pressure During Application of Blocking Permit. Caused by Failed Check Valve on Instrument Air Compressor/ Dryer Train A.Failed Valve Replaced
05000353/LER-1998-004-02, :on 980626,secondary Containment Isolation, SGTS & RERS Initiation Manual Action,Occurred.Caused by Failure of Normal Reactor Enclosure HVAC to Maintain Negative Pressure.Repaired B Train SGTS Control Components
05000352/LER-1987-060, :on 871029,two Reactor Encl Isolations Occurred Due to Decreased Pressure Between Encl & Outside Atmosphere. Caused by Lack of Adequate Valve Tagging Sys.Mod 5561 Prepared to Correct Air Sys Deficiencies
05000352/LER-1987-058, :on 871019,reactor Encl Ventilation Isolation & Nssss Isolation Occurred.Caused by Loss of Auxiliary Steam in Inlet Plenum.Auxiliary Steam Restored & Isolations Reset
05000352/LER-1987-056, :on 871014,reactor Encl Ventilation Isolation Occurred.Caused by Series of Events Related to Auxiliary Steam Boilers.Outside Assistant Operators Replaced Torch Tip on Auxiliary Boiler B
05000352/LER-1987-050, :on 870917,reactor Enclosure Secondary Containment Isolated.Caused by Leak in Instrument Air Line to Reactor Enclosure Exhaust Fan Blade Pitch Control Device. Leak Repaired.Similar Tubing Will Be Inspected
05000352/LER-1987-045, :on 870830,standby Gas Treatment Sys Initiated. Caused by Polyphase Fault to Ground on Unit 2 Load Ctr Transformer,Producing Low Voltage Condition on Unit 1 Instrument Panel.Transformer Returned to Mfg
05000352/LER-1987-022, :on 870609,two Penetrations Containing Testable O-ring Assemblies Not Included in Surveillance Test Procedures.Caused by Procedure Deficiency.Temporary Procedure Change Made
05000352/LER-1987-021, :on 870601,various Channel D Nuclear Steam Supply Shutoff Sys Isolations Occurred.Engineer Caused Short Circuit to Ground,Blowing Fuse Supplying Sys Isolation Circuit Logic.Fuse Replaced.Engineer Counseled
05000352/LER-1998-002, :on 980206,primary Containment & Rv Isolation Control Sys Actuation Occurred.Caused by Personnel Error. Fuse Was Replaced & All Isolations Were Reset within 55 Minutes
05000352/LER-1987-016, :on 870515,reactor Encl Secondary Containment Isolated.Caused by Const Worker Removing Instrument Cap from Outside Atmosphere Pressure Sensing Line.Instrument Cap Replaced & Isolation Reset
05000352/LER-1987-012, :on 870418,reactor Encl Secondary Containment Isolated Due to Low Differential Pressure Between Reactor Encl & Outside.Caused by Loss of Instrument Air Supply to Pressure Converter.Air Supply Restored
05000352/LER-1987-011, :on 870416,operation Personnel Discovered That Reactor Encl Recirculation Sys a Inoperable Since 870403. Cause Unknown.Operator Placed Circuit Breaker Charging Motor Disconnect Switch in on Position
05000352/LER-1986-014, :on 860227,reactor Encl Isolation Occurred W/ Actuation of Recirculation Sys & Standby Gas Treatment Sys. Caused by Break in Equipment Access Airlock.Sys Reset & HVAC Returned to Normal
05000352/LER-1987-001, :on 870105,reactor Encl Secondary Containment Isolation Occurred as Result of Low Differential Pressure. Caused by Events Resulting from Trip of Auxiliary Steam Boiler.Boiler Restarted & Heating Sys Restored
05000352/LER-1986-057, :on 861230,discovered That Surveillance Test (ST) for Leak Tightness of Primary Containment Air Lock Over Due.Caused by Cognitive Personnel Error.St Performed & Scheduling Data Entered Into ST Computer
05000352/LER-1988-025, :on 880627,reactor Encl Isolation Occurred While Performing Surveillance Test.Caused by Instrument Isolation Valve Being Partially Closed During Surveillance. Reactor Encl Isolation Reset Per Procedure
05000353/LER-1999-002-03, :on 990419,various ESF Actuations Due to Loss of Power to 2A Rps/Ups Distribution Panel,Occurred.Caused by Loose Bus Bar Connection in RPS Breaker panel.Bus-bar Connection Inspected,Cleaned & re-tightened
05000352/LER-1986-054, :on 861218,reactor Encl Secondary Containment Isolation Occurred When Fuse Blew in Isolation Logic.Cause Unknown.Fuse Replaced W/Fuse of Correct Size & Isolation Reset
05000352/LER-1986-026, :on 860516,reactor Encl HVAC Isolated During Surveillance Test ST-2-26-621-1.Caused by Blown Fuse in High Radiation Isolation Circuit of Reactor Encl Ventilation Sys. Fuse Replaced & Reactor Encl Isolation reset.W/860613 1tr
05000352/LER-1986-021, :on 860503,inadvertent Initiation of ESF Occurred During Surveillance Testing.Caused by Improper Use of Jumpers.Jumper Removed & Fuse Replaced
05000352/LER-1985-067, :on 850813,reactor Encl Ventilation Sys Isolation Occurred.Caused by Low Encl Differential Pressure. Isolation Reset.Interim Measure Info Tags Placed at Fan Control Panel Re Exhaust Fan Combination
05000352/LER-1988-034, :on 881106,isolation of Reactor Encl Secondary Containment Occurred on Low Differential Pressure.Caused by Severed Instrument Air Line Servicing Reactor Encl Exhaust Fan Blade Pitch Positioner B
05000352/LER-1988-020, :on 880521,reactor Encl Secondary Containment Isolation Occurred.Caused by Vibration Induced to Tubing or Tubing Defect.Air Line Tubing Repaired & Reactor Encl Isolation Reset
05000352/LER-1988-017, :on 880509,reactor Encl Isolation & Nssss Group VI a & B Isolations Occurred.Caused by Component Failure. Instrument Air Supply to SV-76-144A Closed Following Second Reactor Encl Isolation
05000352/LER-1986-004, :on 860109,during Mode 2,reactor Encl Isolation & Reactor Encl Recirculation Sys & Standby Gas Treatment Sys Actuations Occurred.Caused by Exhaust Fan Blade Oscillation. Fan Blade Pitch Adjusted
05000352/LER-1986-002, :on 860105,during Mode 4,unplanned Actuation of Reactor Encl Recirculation Sys & Initiation of Standby Gas Treatment Sys Occurred.Caused by Personnel Error.Personnel Counseled.Info Tags Placed Near Reset Switches
05000352/LER-1988-010, :on 880326,initiation of ESF Occurred Due to Reactor Encl Isolation.Caused by Nonlicensed Operator Failure to Follow Procedures.Reactor Encl Isolation Reset & Normal Ventilation Put in Svc
05000352/LER-1988-002, :on 880130,isolation of Reactor Encl Secondary Containment Occurred.Caused by Exhaust Fan a & B Blade Pitch Settings Requiring Adjustment.Instrument Air Tubing to Exhaust Fan B Damper Replaced
05000352/LER-1985-089, :on 851115,isolation of Reactor Encl Ventilation Sys Occurred.Caused by Inability of Exhaust Fans to Extract Enough Higher Density Air to Maintain Negative Pressure.Auxiliary Steam Restored & Sys Reset
05000352/LER-1985-100, :on 851226,hourly Fire Watch Insps for Four Reactor Encl Fire Barriers Not Performed within Required Time Frame.Caused by Negative Encl Pressure,Due to Supply Fan Trip,Preventing Opening of Airlock Doors
05000353/LER-1993-001-01, :on 930103,reactor Shut Down Automatically on High Pressure After Transient in EHC Sys Occurred Coincident w/balance-of-plant Battery Ground Alarm.Cause Indeterminate. Alarm Reset & Testing Currently Underway
05000352/LER-1985-041, :on 850401,reactor Encl HVAC Sys Isolated. Caused by Spurious Low Reactor Encl to Outside Air Differential Pressure Signal.Isolation Logic Reset & Current Loop Connections Cleaned & Inspected
05000352/LER-1984-041, :on 841222,reactor Encl HVAC Isolated Simultaneous W/ Channel B Low Differential Pressure Annunciation.Caused by False Input Due to High Winds.Related Correspondence
05000352/LER-1985-023, :on 850205,reactor Encl Equipment Compartment B Exhaust Fan Failed,Resulting in Low Air Flow Rate & Low Differential Pressure.Caused by Loose Pneumatic Fitting on Fan.Fitting Tightened
05000353/LER-1996-002-02, :on 960315,ESFA Occurred Due to Loss of Power to Rps/Ups Power Distribution Panel.Caused by Inadvertent Actuation of Underfrequency Relay.Created Necessary Addl Physical Barriers Arounds Units 1 & 2
05000352/LER-1985-005, :on 850108,reactor Encl HVAC Isolated Because of Low Differential Pressure.Possibly Caused by High Winds Providing False Input to Outside Sensing Leg.Isolation Reset & Ventilation Normalized
05000352/LER-1984-045, :on 841230,reactor Encl HVAC Isolated Due to Low Differential Pressure.Caused by False Input in Differential Pressure Sensors Due to High Winds.Isolation Reset & HVAC Sys Restarted
05000353/LER-1992-006-02, :on 920621,operations Personnel Observed Loss of Reactor Enclosure Secondary Containment Causing Blowout Panel to Actuate.Caused by Design Defienciency.Mod to Raise Unit 1 Setpoint Completed
05000352/LER-1996-003, :on 960204,ESFA Occurred Due to Loss of Power to Rps/Ups Power Distribution Panel Caused by Spurious Actuation of Underfrequency Relay.Replaced Relay
05000353/LER-1992-008-02, :on 920717,various Actuations of Primary Containment,Reactor Vessel Isolation Sys & Reactor Encl Secondary Containment Isolation Occurred.Caused by Blown Fuse.Fuse Sent to Mfg for Failure Analysis
05000352/LER-1985-018, :on 850126,reactor Encl Ventilation Isolation Sys A,Recirculation Sys & Standby Gas Treatment Sys Initiated.Caused by Failure to Isolate Refuel Floor Differential Transmitter
05000352/LER-1995-010-01, :on 951223,manual U/1 Sci W/Operation of Common Plant SGTS & U/1 Reactor Encl Recirculation Sys Esfa Occurred Due to Equipment Problems.Removed Re HVAC Sys from Operation
05000352/LER-1992-004-01, :on 920321,reactor Encl Supply Fans Failed to Trip,Resulting in High Reactor Encl Differential Pressure. Caused by Overpressurization Transient Causing Blowout Panel to Open.Mod to Setpoint Implemented
05000352/LER-1991-018, :on 910618,primary Containment & Reactor Vessel Isolation Control Sys Actuations Occurred.Caused by Loss of Power to Distrubution Panel.Preventive Maint Tasks Written to Replace Inductors in Inverters Annually
05000352/LER-1990-033-01, :on 901205,60-amp Power Supply Fuse in Panel 1AY160 Unexectedly Blew,Resulting in Actuation of Primary Containment & Esf.Caused by Wiring Installation Deficiency. Wiring Corrected & New Fuse Installed
05000353/LER-1994-010, :on 941019,reactor Scram & Actuation of Various ESF Resulted from Relay Coil Failure & Inappropriate Action by Licensed Reactor Operator.Evaluated Normal to Alternate Power Supply Transfer Circuits
05000352/LER-1991-023-01, :on 911007,reactor Protection Sys Inverter Output Circuit Breaker Tripped,Causing Loss of Power to Power Distribution Panel.Caused by Actuation of Relay. Alternate Test Method Under Development
05000353/LER-1991-002-03, :on 910324,inadvertent Actuation of Primary & Secondary Containments Occurred.Caused by Blown Fuse During Testing.Procedures for Divisional Safeguard Battery Testing & Preventative Maint Revised
05000353/LER-1995-001, :on 950102,actuations of Unit 1 & Unit 2 Primary Containment & Rv Isolation Control Sys (PCRVICS) Occurred Due to End of Life Fuse Failure.Fuse Replaced & Insp of PCRVICS Circuitry Performed on 950125
05000353/LER-1991-013, :on 910508,trains of SGTS Declared Operable & Tech Spec Action 3.0.3 Exited.Caused by Cognitive Personnel Error.Blocking Permits Reviewed,Operations Personnel Counseled & Existing Guidance Reviewed
05000352/LER-1991-012, :on 910508,reactor Encl Overpressurized & Blowout Panel Opened Due to Failure of C Reactor Encl HVAC Supply Air Fan.Fan Power Supply Breaker Trip Coil Replaced & Satisfactorily Tested
05000353/LER-1994-010-01, :on 941019,reactor Scram & Actuation of Various Engineered Safety Features Resulting from Relay Coil Failure & Inappropriate Action by Licensed Reactor Operator.Failure Analysis Being Performed
05000352/LER-1991-019-01, :on 910716,ESF Actuation Occurred Due to Loss of Power Distribution Panel.Caused by Spurious Actuations of Underfrequency Relay.Relay Replaced & Evaluation Performed Investigating Revs to Breaker Trip Logic
05000353/LER-1991-013-02, :on 910717,condition Prohibiting Tech Specs Where Surveillance Requirement Not Met & Primary Containment Integrity Not Verified.Caused by Personnel Error.Procedures Revised
05000352/LER-1994-002, :on 940116,manual Isolation of Reactor Enclosure Secondary Containment Occurred Due to Equipment Problems Encountered W/Auxiliary Boiler Sys.Thawed Sensing Line & Repaired Packing Leak
05000353/LER-1990-011, :on 900713,reactor Encl Secondary Containment Isolation or Low Differential Pressure Occurred.Caused by Severed Instrument Air Line.Instrument Air Line Repaired on 900713
05000352/LER-1991-001-01, :on 910107,3 of 4 Reactor Encl HVAC Supply & Exhaust Air Fans Tripped,Resulting in High Positive Air Pressure.Plant Shutdown on 910108.Caused by Failure of Discharge Dampers to Open Fully.Coil Replaced
05000352/LER-1990-032-01, :on 901204,personnel Received Indication That Isolation of Reactor Encl Heating Ventilation & Air Conditioning Sys ESF Actuation Occurred as Result of Blown Fuse in Panel.Cause Unknown.Fuse Replaced
05000353/LER-1990-019-01, :on 901101,various Actuations of Primary Containment & Reactor Vessel Isolation Control Sys,Esf & Channel B RPS half-scram Occurred.Caused by Damaged Connector in Inverter Circuitry
05000353/LER-1990-019-02, :on 901101,half-scram & Isolations Resulted from Loss of Power to Rps/Uninterruptible Supply Panel Due to Inverter Damage
05000353/LER-1990-015-02, :on 900910,reactor Scram Occurred Due to Spurious Trip Signal from Steam Leak Detection Sys Temp Switch.Caused by Equipment Failure.Temp Switch TTS-25-216D Was Replaced
05000353/LER-1990-011-02, :on 900713,positive Differential Pressure Condition Between Reactor Encl Secondary Containment & Outside Atmosphere Occurred,Resulting in Blowout Panel Actuation.Caused by Severed Air Supply Line
05000352/LER-1993-008-01, :on 930627,MCR Annunciator Alarmed Indicating That Outside Atmosphere Reactor Encl (Re) Negative Differential Pressure Decayed Due to Failure of Normal Re Ventilation Fan Motor.Subj Fan Replaced
05000352/LER-1993-006-01, :on 930506,ESF Actuation Resulted from Rwcs Isolation Due to High RWCU Pump a Room Temp.Faulty Breaker Replaced & Re HVAC Sys Repaired
05000353/LER-1990-007-01, :on 900330,actuations of Primary Containment & Reactor Vessel Isolation Control Sys ESF Occurred.Caused by Gross Failure of Inverter Inductor.Inverter Bypassed,Shunt Trip Breaker Closed & Isolations Reset
05000353/LER-1990-001, :on 900108,Tech Spec Violation & Reactor Encl Ventilation Isolation Occurred.Caused by Personnel Error. Chief Operator Counseled on Importance of Communicating All Pertinent Info
05000353/LER-1989-015-02, :on 891223 & 24,problem W/Reactor Protection Sys (Rps)/Uninterruptable Power Supply Static Inverter Caused Loss of Power to RPS Panel.Caused by Failure of Gate Drive Boost Card.Isolations Reset
05000352/LER-1989-055, :on 891025,reactor Protection Sys 1A Shunt Trip Breaker Tripped on Undervoltage,Causing Loss of Power to Distribution Panel 1AY160 & ESF Isolation.Caused by Relief Valve Failures.Isolations Reset
RS-19-017, Application to Remove the Table of Contents from Technical Specifications and Place It Under Licensee Control
05000352/LER-2012-003, Regarding Valid Manual Actuation of the Primary Containment Isolation System Due to Ventilation System Trip
05000352/LER-2011-001, Regarding 1B Reactor Enclosure Recirculation System Charcoal Sample Analysis Results Exceeded TS Limit
05000352/LER-2002-004, For Limerick Unit 1 Regarding Reactor Enclosure Recirculation System (RERS) Train Potentially Inoperable for a Period Exceeding the TS AOT
JAFP-21-0089, Application to Revise Technical Specifications to Adopt TSTF-541 Revision 2, Add Exceptions to Surveillance Requirements for Valves and Dampers Locked in the Actuated Position
05000352/LER-1987-013, :on 870508,reactor Encl Secondary Containment Isolated Due to Low Differential Pressure Between Encl & Outside Environ.Caused by Personnel Error.Sign Posted on Filter Entry Hatch
05000352/LER-1987-018, :on 870520,leakage Rates of MSIVs & Total Primary Containment Leakage Exceeded Tech Spec Limit.Caused by Normal Wear.Msivs Repaired & Type B & C Pentrations Repaired
05000352/LER-1986-040, :on 860723,RWCU Sys Isolated Twice as Result of Regenerative HX Room Temp Exceeding 122 F Setpoint.Caused by Ventilation Sys Being Removed from Svc & Failure of Pressure Safety Relief Valve
05000353/LER-1994-003, :on 940420,primary Containment & Reactor Vessel Isolation Control Sys ESF Actuation Occurred.Caused by Blown Fuse as Result of Personnel Error.I&C Technician Counseled Re Attention to Detail