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    "query_string": "[[Category:REPORTABLE OCCURRENCE REPORT (SEE ALSO AO LER)]] [[Site::Peach Bottom||05002787]]",
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	Issue date	Title	Topic
05000000/LER-1986-009, Ro:On 860312,discovered That LER 2-86-04 & LER 86-009 Not Submitted to Nrc.Caused by Misplaced Repts.Repts Telecopied to Nrc.Procedure for Distribution of Repts Revised	14 April 1986	Ro:On 860312,discovered That LER 2-86-04 & LER 86-009 Not Submitted to Nrc.Caused by Misplaced Repts.Repts Telecopied to Nrc.Procedure for Distribution of Repts Revised
ML20055B518	13 July 1982	RO Advising That Triaxial Accelerometer Devices in Reactor Core Isolation Cooling Sys Pump Room Inoperable for More than 30 Days.Replacement Detector to Be Installed by 820831
ML20056G870	27 August 1993	Special Rept:On 930803,discovered That Cylinder on 2-EDG Lower than Normal Operating Temps.Caused by Fuel Pin on Cylinder Injector Pump Not Fully Engaged
ML20058B710	14 July 1982	Ro:On 820619,during Scheduled Loss of Power Test on Unit 2, Inadvertent Startup of ECCS on Unit 3 Initiated While at Full Power.Caused by Defective Elma Dc Power Supply to 24-volt Dc Logic Circuit
ML20058N665	8 August 1990	Special Rept:On 900802 & 07,diesel Driven & Motor Driven Fire Pumps,Respectively,Declared Administratively Out of Svc.Caused by Engine Overheating & Diesel Generator (DG) E-2 Out of Svc.Local Fire Depts Notified & DG E-2 Repaired
ML20059A827	22 October 1993	Special Rept:On 931012,valid Failure of EDG E-2 Occurred During Routine Monthly Test.Edg E-2 Declared Inoperable Due to High Fuel Oil Differential Pressure Condition.Edg E-2 Fuel Oil Filters Replaced
ML20059B899	21 August 1990	Special Rept:On 900802,diesel Driven Fire Pump Declared Inoperable During Testing Due to Engine Overheating.Diesel Generator E-2 Returned to Operable Status & motor-driven Fire Pump Declared Operable on 900807
ML20062C316	11 October 1978	Rept Occurrence 2-78-41/1P:on 781010 During Routine Surveillance Test of Unit 2 4KV Undervoltage Relays,Setpoint of Bus Sequence Loading Relays E-32 & E-42 Were Out of Calibr,Due to Engr Error
ML20062J851	6 November 1980	Ro:On 801106,during Increase of Reactor Power from Hot Standby Condition,Main Steam Bypass Valve 3 Exhibited Erratic Operation.Caused by Defective Circuitry Board. Board Removed.Stable Pressure Control Sys re-established
ML20062J852	6 November 1980	Ro:On 801105,while Performing Routine Surveillance Test on HPCI Sys,Hpci Observed to Start,Trip & Restart in Succession Several Times.Caused by Open Resistor Which Provides Input Power to Emergency Generator Motor.Component Replaced
ML20062L016	5 January 1981	RO 2-81-02/1P:on 810105,at 100% Power,During Surveillance Testing,Reactor Core Isolation Cooling Pump Flow Indication Observed Upscale W/Pump Secured.Caused by Failed Square Root Extractor in Flow Control Loop.Extractor Replaced
ML20062L218	14 January 1981	RO 2-81-4/1P on 810114:diesel Generator E3 Output Breaker to Unit 2 Emergency Bus Failed.Cause Unknown.Failed Breaker Replaced
ML20062L528	13 January 1981	RO 81-003/01P-0:on 810113,leak Discovered on Oil Supply Line to Turbine Manual/Overspeed Trip Mechanism of HPCI Auxiliary Oil Pump.Probable Cause Due to Leaking Valve or Fitting in Supply Line.Investigation Underway
ML20064A465	27 August 1990	Special Rept:On 900802,diesel-driven Fire Pump Declared Inoperable During Testing Due to Engine Overheating.Caused by Silt & Marine Biotic Life Plugging Y Strainer in Cooling Line.Strainer Cleaned & Retested
ML20064C301	28 February 1994	Special Rept:On 940211,non Valid Failure of EDG E-4 Occurred When Voltage Shutdown Button Inadvertently Bumped.Maint Insp Initiated to Determine If Generator Damage May Have Occurred Due to Event.Remaining EDGs Were Operable
ML20064E050	19 October 1978	Reportable Occurrence 3-78-20/1P on 781019:while Unit 2 Was Being Inerted,Unit 3 Drywell Oxygen Concentration Exceeded Tech Spec Limit by 0.1%.Drywell Was Depressurized & Purged to Bring Oxygen Concentration W/In Limit
ML20066A581	28 October 1982	RO 2-82-36/1P:on 821024,71J Safety Relief Valve Opened When Pressure Reached 832 Psig.Cause Unknown.Valve to Be Sent to Vendor.Two Vacuum Breakers Replaced.Fatigue Analysis Determined Downstream Piping Not Overstressed
ML20066A939	25 October 1982	Ro:Response Spectrum Analyzer Component of Seismic Monitoring Sys Intermittently Inoperable Since 820909.Caused by Malfunctioning Power Control Card.Card Will Be Replaced. Component to Be Returned to Svc by 821130
ML20069L317	11 April 1983	Corrected RO 3-83-11/1P:on 830407,full-in Position Signal Jumpered Into Probe Buffer Cards.Control Rods Could Have Been Withdrawn W/O Initiating Single Control Rod Interlock. Caused by Personnel Error.Jumpers Removed
ML20071Q577	2 August 1994	Special Rept:On 940706,valid Failure of E-4 Emergency Diesel Generator Occurred.Caused by Solenoid Valve Spuriously Sticking.Valves Replaced
ML20077P970	15 August 1991	Special Rept:On 910714,diesel Driven Fire Pump Out of Svc for More than Seven Days Due to Annual Preventative Maint Activities.Preventative Maint Completed & Pump Returned to Svc.Operability Testing Completed Satisfactorily on 910723
ML20078C170	24 October 1994	Special Rept:On 940924,valid Failure of E-2 EDG Occurred. Caused by Problem w/4 Kv Breaker.Breaker Incorporated Into Preventive Maint Program to Replace Grease
ML20079L268	15 February 1983	RO 3-83-08/1P:on 830214,three of Eight MSIVs Failed to Pass Tech Spec Limit of 11.5 Scfh & Containment Isolation Valve Mo 2-74 Failed Leak Rate Test.Caused by Abnormal Wear of Valve Internals.Valves to Be Inspected & Repaired
ML20079L629	30 October 1991	Special Rept:On 910916 & 23,cable Spreading & Computer Room CO2 Fire Protection Sys Out for Svc for More than 14 Days. Caused by Need to Provide for Worker Safety During Mod Work. Fire Detectors Verified Operable & Firewatch Stationed
ML20080A773	16 January 1984	Ro:On 831128,from 830830-1128,seismic Monitoring Sys Inoperable.Caused by Personnel Oversight.Startup check-off List Modified to Require Maint Request
ML20083P820	5 March 1984	Ro:On 840125,moisture Sensor in Recirculation Sys Moisture Monitoring Sys Functioned Improperly & Sys Declared Inoperable.Caused by Failed Techmark Limited Moisture Sensor Circuit Card.Sensor Replaced
ML20083P963	12 March 1984	Ro:On 840209,CO2 Fire Protection Sys,Serving Cable Spreading Room & Computer Room,Declared Inoperable.Caused by Ground in One of Two Cables from Smoke Detector Control Panel.Cables Replaced & Sys Available for Svc	Continuous fire watch
ML20083Q023	23 March 1984	Ro:On 840224,during Verification of Moisture Monitoring Sys,Point 7 Failed.Cause Will Be Determined During Next Outage W/Drywell Deinerted.Drywell Sump Collection Sys Will Be Monitored Hourly
ML20085M395	29 October 1973	Ro:Describing Possible Backseating Disc Mislocation Problem on 2-inch Darling Valves on S-350 Wdd Welding End.Valves Repaired.Valve Stems Will Be Changed During Next Refueling Outage
ML20086F080	6 June 1977	Ro:On 770506,plant Iodine & Particulate Release Rate Exceeded 4% of Facility Tech Spec Averaged Over Second Calendar Quarter of 1977.Caused by Fuel Perforations Coupled W/End of Cycle Testing & Reactor Coolant & Steam Leaks	Fuel cladding
ML20086F307	21 September 1977	Environ RO 77-25:on 770912,pH for Settling Basin Effluent Exceeded Ets.Cause Not Determined.Settling Basin Isolated & Neutralized.After Ph Check,Sys Returned to Normal Operation	Grab sample
ML20086F309	6 September 1977	Environ RO 77-23:on 770827,pH for Settling Basin Effluent Exceeded Ets.Caused by Syphon Created in Effluent Pipe. Settling Basin Isolated & Neutralized	Grab sample
ML20086F312	10 August 1977	Environ RO 77-22:on 770801,small Contained Oil Spill Observed at North End of Plant Site.Caused by Turbine Lube Oil Conditioner Losing Water Seal.Water Seal Level Readjusted & Storm Drain Flushed to Remove Residual Oil
ML20086F313	26 July 1977	Environ RO 77-21:on 770716,total Suspended Solids for Sewage Plant Effluent Exceeded ETS 2.2.2 Limit.Caused by Efforts to Change Bacterial Strain Which Produced Low Ph During Digestive Process.Aeration of Sludge Tank Adjusted
ML20086F314	15 July 1977	Environ RO 77-20:on 770706,pH for Settling Basin Effluent Exceeded ETS Limit.Caused by Operator Error.Settling Basin Isolated & Neutralized,Ph Checked & Sys Returned to Normal Operation	Grab sample
ML20086F315	8 July 1977	Environ RO 77-19:on 770628,pH for Sewage Plant Effluent Exceeded ETS Limit.Cause Under Investigation.Sewage Plant Being Operated Normally & Effluent Being Neutralized When Possible	Grab sample
ML20086F316	5 July 1977	Environ RO 77-18:on 770624,pH for Settling Basin Effluent Exceeded ETS Limit.Caused by Leakage of Two Valves Located Between Neutralizing Tanks & Demineralizer Regeneration Waste Sump.Settling Basin Neutralized	Grab sample
ML20086F317	1 July 1977	Environ RO 77-17:on 770622,pH for Sewage Plant Effluent Exceeded ETS Limit.Caused by Development of Bacterial Strain Which Produces Low Ph During Digestive Process.Plant Operated Normally.Normal Ph Reached in 2 Days	Grab sample
ML20086F318	24 June 1977	Environ RO 77-16:on 770614,pH for Sewage Plant Effluent Exceeded ETS Limit.Caused by Development of Bacterial Strain Which Produces Low Ph During Digestive Process.Plant Being Operated Normally	Grab sample
ML20086F321	16 June 1977	Environ RO 77-15:on 770606,pH for Sewage Plant Effluent Exceeded ETS Limit.Caused by Bacterial Strain Which Produces Low Ph During Digestive Process.Sewage Plant Operated Normally & within 3 Day Ph Limit	Grab sample
ML20086F322	27 May 1977	Environ RO 77-13:on 770517,total Suspended Solids for Sewage Plant Effluent Exceeded ETS 2.2.2 Limit.Caused by Sys Upset & Greater than Normal Water Input Due to Refueling Outage. Aeration Rate Adjusted
ML20086F323	18 April 1977	Environ RO 77-11:on 770407,pH for Settling Basin Effluent Exceeded ETS Limit.Caused by Regeneration of Anion & Cation Demineralization W/O Verification of Closure of Neutralizing Pump Discharge Valve	Grab sample
ML20086F324	1 April 1977	Environ RO 77-10:on 770321 & 22,pH for Sewage Plant Effluent Exceeded ETS Limit.Caused by Influent W/Ph Slightly Lower than Normal.Plant Neutralized & Returned to Normal Operation	Grab sample
ML20086F325	22 February 1977	Environ RO 77-7:pH for Sewage Plant Effluent Exceeded ETS Limit.Caused by Influent W/Ph Slightly Lower than Normal.Plant Neutralized & Returned to Normal Operation	Grab sample
ML20086F326	2 May 1977	Environ RO 77-12:on 770422,pH for Sewage Plant Effluent Exceeded ETS Limit.Caused by Influent W/Ph Slightly Lower than Normal.Plant Neutralized & Returned to Normal Operation	Grab sample
ML20086F380	1 February 1977	Environ RO 77-5:on 770123,pH of Sewage Plant Effluent Exceeded ETS Limit.Caused by Influent W/Ph Slightly Lower than Normal.Plant Neutralized & Returned to Normal Operation	Grab sample
ML20086F381	27 December 1976	Environ RO 76-45:on 761217,chemical Usage for First 6 Months of 1976 Exceeded Twice Estimated Yearly Usage.Caused by High Demineralizer Water Consumption Due to High Makeup to Auxiliary Boilers & Increased Makeup to Main Units
ML20086F412	9 December 1976	Revised RO Re Plant Iodine & Particulate Release Rate Exceeding 4% of Tech Spec 3.8.C.2 Averaged Over Fourth Quarter 1976.Caused by Leaks in Reactor Water Cleanup Sys. Leaks Repaired & Equipment Modified to Reduce Leakage
ML20086F418	9 December 1976	RO Re Plant Iodine & Particulate Release Rate Exceeding 4% of Tech Spec 3.8.C.2 Averaged Over Fourth Calendar Quarter 1976.Caused by Leaks in Reactor Water Cleanup Sys.Leaks Repaired & Equipment Modified to Reduce Leakage
ML20086F426	16 June 1977	Environ RO 77-14:on 770606 & 08,ph for Settling Basin Effluent Exceeded ETS Limit.Cause Not Identified.Settling Basin Isolated & Neutralized.Ph Checked & Sys Returned to Normal Operation	Grab sample

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