Semantic search
Jump to navigation
Jump to search
| Issue date | Title | Topic | |
|---|---|---|---|
| ML17317B264 | 8 June 1979 | LER 79-019/01T-0 on 790519:cracks Found in 16-inch Feedwater Elbows Adjacent to Nozzle Welds Caused Buildup of Nonradioactive Water in Containment Sump.Caused Being Determined.Elbows in Generators Being Replaced | Liquid penetrant |
| ML17317B275 | 8 June 1979 | LER 79-019/01X-1 on 790519:small Leaks Found in Feedwater Piping to Steam Generator.No Further Description | |
| ML17317B325 | 13 July 1979 | LER 79-034/03L-0 on 790613:several Valves Exhibited Excessive Leakage Causing as-found Leak Rate to Exceed Limit.Caused by Leakage from Check Valves.Check Valves Replaced | |
| ML17317B330 | 13 July 1979 | LER 79-020/03L-0 on 790615:several Valves Exhibited Excessive Leakage,Causing as-found Leak Rate to Exceed Limit.Major Source of Leak Attributed to Check Valves.Caused by Sand Deposits on Seating Surfaces & Pitted Seats | |
| ML17317B349 | 19 July 1979 | LER 79-021/03L-0 on 790622:starting Time Exceeded Tech Specs During Test on Hydrogen Skimmer Recirculation Fan.Design Change Installed 781118 After Repeated Occurences & 10 Tests Satisfactorily Performed | |
| ML17317B374 | 25 July 1979 | LER 79-022/03L-0 on 790706:bistable 2PB-934B Tripped at Value Exceeding Tech Spec Limit by 0.104 Psi During Surveillance Test on Containment Pressure Protection.Caused by Drifting of Bistable Trip Set Point.Bistable Replaced | |
| ML17317B398 | 27 July 1979 | LER 79-023/03L-0 on 790629:in Mode 4,during Startup from Cold Shutdown,East Engineered Safety Features Ventilation Sys Fire Protection Spray for Charcoal Filter Operated at 2,230.Caused by Grounded Manual Actuation Station | Fire Watch |
| ML17317B407 | 31 July 1979 | LER 79-024/03L-0 on 790702:south Boric Acid Storage Tank & Boron Injection Tank Were Out of Spec While Unit Was in Hot Standby.Caused by Normal Fluctuation.Boric Acid Was Transferred to Tank | Boric Acid |
| ML17317B408 | 31 July 1979 | LER 79-025/03L-0 on 790702:safety Valve Was Lifted on Steam Generator 3,which Brought Reactor to sub-critical Condition. Operation of Safety Valve Was within Allowed Setpoints.Gag Removed & High Power Trips Reset | |
| ML17317B412 | 31 July 1979 | LER 79-034/03L-0 on 790705:during Plant Tour,Two Ice Condenser Intermediate Deck Doors Were Found Frozen Shut. Cause Not Determined.No Further Action Planned.Formerly Numbered Incorrectly as LER 79-034/03L-0 | |
| ML17317B413 | 31 July 1979 | LER 79-035/03L-0 on 790705:while Cleanup of Demineralized Water Sys Was in Process,Rcs Passed from Operational Mode 5 to Mode 4 & Isolation Valves Closed.Caused by Breakdown of Communication Between Cleanup Crew & Reactor Operator | |
| ML17317B430 | 8 August 1979 | LER 79-025/03L-0 on 790709:while Reviewing Axial Power Distribution Monitoring Sys Printouts,Discovered Two Occasions in Which Results of Only One Detector Scan Printed Out.Cause Under Investigation | |
| ML17317B433 | 8 August 1979 | LER 79-037/03L-0 on 790709:position of Certain Control Bank C Rods Exceeded 12-step Limit Imposed by Tech Specs. Caused by Drifting of Rod Signal Conditioning Module | |
| ML17317B434 | 31 July 1979 | LER 79-036/03L-0 on 790709:two Ice Condenser Intermediate Deck Doors Found Frozen Shut.Cause Not Determined.Ice Chipped Off & Doors Returned to Operable Status | |
| ML17317B470 | 8 August 1979 | LER 79-026/03L-0 on 790723:while Studying Computer Printout for Axial Power Distribution,Discovered One Detector Scan Printed Out.Problem Under Investigation.Operations Personnel Closely Monitoring Printouts | |
| ML17317B471 | 15 August 1979 | Updated LER 78-065/03X-1 on 781229:previous Rept of Inoperable Pressurizer Level Channel Is No Longer Considered RO Due to Recent Tech Spec Change Deleting All Pressurizer Low Level Operability Requirements | |
| ML17317B472 | 15 August 1979 | LER 79-027/03L-0 on 790723,previously Issued as LER 79-025/03L-0:while Reviewing Computer Printout,Discovered K 0900 Address Not Reset to 0 Prior Ro Scanning Core.Temporary Change Sheet Issued | |
| ML17317B473 | 15 August 1979 | Updated LER 79-022/03X-1 on 790323:to Prevent Recurrence of Nearly Simultaneous Bus Failures,Battery Equalizing Charge Has Been Reduced from 280 to 275 Volts.Addl Design Change Requested to Provide Overvoltage Alarm to Alert Operators | |
| ML17317B474 | 15 August 1979 | Updated LER 79-030/03X-1 on 790417:design Change Coupled W/Relay Degradation Caused Relay to React Slower During Sequence.Design Change RFC-DC-12-2384 Installed as Preventive Measure | |
| ML17317B475 | 15 August 1979 | Updated LER 79-039/03L-0 on 790720:control Sys Repaired to Deliver Larger Quantity of Acid to Rcs.No Further Action Planned | |
| ML17317B496 | 26 July 1979 | LER 79-040/03L-0 on 790726:during Moderator Coefficient Test,Reactor Power Decreased from 79% to 58% in 43 Minutes. Iodine Isotopic Analysis Not Performed in Required Time. Caused by Poor Communication Between Operator & Supervisor | |
| ML17318A260 | 13 September 1979 | LER 79-042/03L-0:on 790814,pressurizer Pressure Transmitters Isolated.Caused by Instrument Drift.Investigation in Progress.Transmitters Recalibr | |
| ML17318A261 | 13 September 1979 | LER 79-043/03L-0:on 790201,axial Power Distribution Monitoring Sys Detector Alarm Setpoint Was Set Nonconservatively.Setpoint Reset.Personnel Received Addl Training | |
| ML17318A275 | 18 September 1979 | LER 79-044/03L-0:on 790825,cable Penetration in Floor of Hot Shutdown Panel Found to Have Fire Barrier Seal Removed. Removed by Contractor for Design Change.Continuous Fire Watch Stationed | Fire Barrier Continuous fire watch |
| ML17318A318 | 1 October 1979 | LER 79-045/03L-0:on 790831,ice Condenser Intermediate Deck Door Found Frozen Shut.Caused by Condensation as Result of Increased Influx of Humid Air.Ice Was Chipped Away & Door Freed | |
| ML17318A414 | 13 November 1979 | LER 79-002/03X-1:on 790127,injection of Boric Acid Caused Increase of Neutron Flux in Reactor Core.Axial Flux Difference Exceed Limits & Alarm Did Not Function Properly. Caused by Hardware Failure | Boric Acid |
| ML17318A464 | 28 November 1979 | LER 79-057/03L-0:on 791029,while Shifting to RHR,motor- Operated Containment Isolation Valve Failed to Open Completely & Would Not Close.Caused by Corrosion of Valve Operator Torque Switch Due to Condensation in Conduit | |
| ML17318A468 | 28 November 1979 | LER 79-039/03L-0:on 791031,containment Air Particulate Detector Tripped on Low Flow While Plant Was in Mode 6. Caused by Flow Trip Switch in Nonvertical Position.Proper Air Particulate Flow Established | |
| ML17318A471 | 26 November 1979 | LER 79-056/03L-0 on 791027,opening Torque on Two Ice Condenser Lower Inlet Doors Exceeded Max Tech Spec Limit. Caused by Door Springs Slightly Stiffer than Doors on Other Bays.Spring Tension Bolts Adjusted | |
| ML17318A476 | 28 November 1979 | LER 79-038/01T-0:on 791114,boron Injection Flow Path Was Inadvertantly Made Inoperable to Perform Surveillance Testing.Caused by Charging Line Being Out of Svc for Sys Mod.Fuel Element Altered | |
| ML17318A579 | 22 January 1980 | LER 79-054/03L-0:on 791226,during Surveillance Test on Automatic Load Sequence Timing Relays,Four Timers Found to Exceed Tolerance.Caused by Original Setpoint Valve Value Differing from Design Value.Test Procedure Modified | |
| ML17318A645 | 17 March 1980 | LER 80-010/03L-0:on 800216,during Surveillance Test,Suction Valve VMO-102 for Containment Equalization Fan HV-CEQ-2 Failed to Open,Making Air Recirculation Sys Inoperable. Caused by Maladjusted Torque Switch in Motor Operator | |
| ML17318A797 | 4 June 1980 | Updated LER 80-001/03X-1:on 800119,w/approx 10% Power Level, Steam Generators Fed Too Much Feedwater Flow Resulting in Temp & Pressure Drop.Caused by Attempt to Recover Low Steam Generator Level | |
| ML17319A456 | 19 June 1980 | LER 80-024/03L-0:on 800520,w/turbine Drive Auxiliary Feedwater Pump in Nonrunning Standby Position,Alarm Received That Pump Tripped.Probably Caused by Control Linkage Disconnecting from Throttle Valve | |
| ML17319A463 | 23 June 1980 | LER 80-010/03L-0:on 800522,during Ice Condenser Insp,Eight Intermediate Deck Doors Were Found Frozen & Considered Inoperable Per Tech Spec.Caused by Condensation on Top Deck Door Divider Beam.Design Change Requested | |
| ML17319A467 | 25 June 1980 | LER 80-011/03L-0:on 800531,w/unit in Shutdown Mode, Containment Atmosphere Air Particulate & Gaseous Radiation Monitoring Sys Pump Tripped on Low Flow.Caused by Inaccurate Flowmeter.Flowmeter Replaced | |
| ML17319A511 | 14 July 1980 | LER 80-027/03L-0:on 800613,during Piping Mod,Hand Shutoff Valve in Suction Line to Motor Driven Auxiliary Feed Pump 1 Was Closed to Stop Leakage Interfering W/Welding.Pump Was Inoperable Until Completion of Welding | |
| ML17319A735 | 26 February 1981 | Updated LER 80-024/03X-1:on 800520,alarm Indicated Auxiliary Feedwater Pump Tripped in Nonrunning Auto Standby Position. Caused by Turbine Control Linkage Unlatching from Trip & Throttle Valve,Possibly Due to Lumber on Trip Linkage | |
| ML17319A766 | 12 March 1981 | LER 81-002/03L-0:on 810215,west Motor Driven Auxiliary Feed Pump Was Removed from Svc to Repair Emergency Leakoff Line Check valve,FW-160.Caused by Dirt Causing Valve to Stick. Valve Cleaned | |
| ML17319A776 | 13 March 1981 | LER 81-003/03L-0:on 810212,during Normal Operations,Control Room Cable Vault Left Unattended W/No Fire Watch Posted While Access Door Was Sealed for Testing.Caused by Misunderstanding of Tech Spec 3.7.10.Personnel Reinstructed | Fire Watch |
| ML17319A788 | 23 March 1981 | Updated LER 80-019/03X-1:on 800811,surveillance Requirement Tech Spec 4.8.1.1a Not Performed.Caused by Operator Error. Operator Reprimanded.Procedures Revised to Include Breaker Alignment & to Require Signoff on Completion | |
| ML17319A792 | 17 March 1981 | LER 81-003/03L-0:on 810217 & 0301,ESW Pump 2-E Found Inoperable.Caused by Closed Inlet & Outlet Slide Gate Valves to Strainers on Discharge of ESW Pumps Due to Defective Agastat Timer.Timer Replaced & Backwash Sys Cycled | |
| ML17319A800 | 1 April 1981 | LER 81-004/03L-0:on 810308,ISI Data Review for Ba Transfer Pump 3 Was Not Reviewed within 96-h Time Limit.Caused by Test Data Being Inadvertently Overlooked by Technical Inservice Insp Coordinator.Card File Developed | |
| ML17319A802 | 1 April 1981 | LER 80-029/03L-0:on 801217,during NRC Audit of Surveillance Records of Essential Svc Water Sys,Operations Dept Procedure 01-OHP 4030.STP.022,Revision 5,found Deficient in Meeting Tech Spec Requirements.Caused by Personnel Error | |
| ML17319A823 | 27 April 1981 | LER 81-008/03L-0:on 810407,during Fire Protection Spray Sys Surveillance Test,Eight Spray Nozzles for Engineered Safety Features Vent Charcoal Filter 2-HV-AES-1 & 14 Nozzles for 2-HV-AES-2 Were Found Partially Plugged.Sys Flushed | |
| ML17319A825 | 27 April 1981 | LER 81-009/03L-0:on 810408,during Fire Protection Spray Sys Surveillance Test,Eight Spray Nozzles for Engineered Safety Feature Charcoal Filter 1-HV-AES-1 Were Found Partially Plugged.Caused by Buildup of Debris in Nozzles.Sys Flushed | |
| ML17319A828 | 29 April 1981 | LER 81-009/03L-0:on 810331,after Entering Mode 6 & Floodup of Reactor Cavity,Routine Analysis of RCS Indicated Chloride Concentration of 0.26 Ppm.Cause Is Undetermined. Contamination Was Reduced by Purification | |
| ML17319A841 | 5 May 1981 | LER 81-010/03L-0:on 810411,snubbers 1 & 29 Were Found Inoperable.Caused by Fluid Leak on 29 Due to Separation of Joint at End Seal O-ring.O-ring Replaced.Snubber 1 Upside Down Due to Loose Extension Rod Locknut.Locknut Tightened | |
| ML17319A842 | 5 May 1981 | LER 81-011/03L-0:on 810411,steam Line Pressure Transmitter MPP-210 Was Found Exceeding Allowable Value for Differential Pressure Between Steam Lines.Caused by Instrument Drift. Transmitter Recalibr | |
| ML17319A843 | 5 May 1981 | LER 81-012/03L-0:on 810413,cracks Found in Divider Barrier Seal.Cause Unknown.Defective Portions Replaced |