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 Issue dateTitleTopic
ML20084D23912 April 1974Preliminary AO 50-219/74/26:on 740412,emergency Svc Water Pump 52C Failed to Start.Cause Under Investigation
ML20085K06020 December 1973Ao:On 731212,w/reactor at Full Temp & Pressure,Mechanical Failure of Oil Line in HPCI Turbine Control Sys Rendered Turbine Operable.Caused by Full Circumferential Sheer Failure of Pipe Bushing.Bushing Replaced
ML20086F8435 December 1975AO 75-77:on 751126,LS-4223 Failed to Operate RHR Head Spray Line High Point Vent SV-4223 on Low Accumulator Level.Caused by Blown Fuse in Solenoid Valve Circuit.Grounded Wire Repaired & Vent Valve Returned to Svc
ML20086F8491 December 1975Telecopy AO 75-77:on 751126,LS-4223 Failed to Operate SV-4223 on Low Accumulator Level.Caused by Blown Fuse in Solenoid Valve Circuit.Operator Manually Vented Accumulator to Ensure Head Spray Line Maintained Filled
ML20086F85526 November 1975AO 75-76:on 751117,rigid Pipe Support Found Broken on RHR Shutdown Cooling Suction Line.Caused by Component Failure. Pipe Support Replaced.Investigation Continuing
ML20086F86118 November 1975Telecopy AO 75-76:on 751117,rigid Pipe Support Found Broken on RHR Shutdown Cooling Suction Line.Cause Under Investigation.Corrective Action to Be Determined After Investigation
ML20086F87126 November 1975AO 75-75:on 751117,reservoirs of Two Hydraulic Snubbers Found Empty.Caused by Leaking O-rings & Gaskets.Defective gaskets,seals,O-rings & Fittings Will Be Replaced & Snubbers Will Be Checked
ML20086F87418 November 1975Telecopy AO 75-75:on 751117,two Outside Drywell Snubbers Found to Have Empty Reservoirs.Cause Under Investigation. Corrective Action to Be Determined After Investigation
ML20086F88026 November 1975AO 75-74:on 751116,setpoint of RCIC Steam Supply Line Area High Temp Switch TE-TS 4939A Found Less Conservative than Specified by Tech Specs.Caused by Slight Setpoint Drift. Switch Recalibr,Tested & Returned to Svc
ML20086F89017 November 1975Telecopy AO 75-74:on 751116,setpoint of RCIC Steam Supply Line High Temp Switch TE-TS 4939A Found Less Conservative than Allowed by Tech Specs.Caused by Slight Setpoint Drift. Switch Recalibr & Returned to Svc
ML20086F89621 November 1975AO 75-73:on 751113,leak Observed on RHR Sys Relief Valve RV-35B.Caused by Throttling of MO-2-10-154B Valve Resulting in Crack.Weld Repairs Will Be Made to Relief Valve in Accordance W/Approved Procedures
ML20086F90214 November 1975Telecopy AO 75-73:on 751113,leak on Body of RV-35B RHR Sys Relief Valve Observed.Caused by Throttling of MO-2-10-154B Valve Resulting in Crack.Rhr Loop B Shut Down in Preparation for Repair of Relief Valve
ML20086F90617 November 1975AO 75-71:on 751107,cracked Weld on 1-inch Line to Relief Valve RV-35B Observed.Caused by Throttling MO-2-10-154B Resulting in Cracked Weld.Repairs Completed in Accordance W/Approved Procedure
ML20086F91110 November 1975Telecopy AO 75-71:on 751107,cracked Weld on Line to RV-35B Observed.Caused by Throttling Down on MO-2-10-154B Resulting in Weld Crack.Repairs Completed.Pipe Vibration Readings Taken to Determine If Mods Required
ML20086F91814 November 1975AO 75-70:on 751104,reservoirs of Five Hydraulic Snubbers Found Empty.Caused by Leaking O-rings & Gaskets.Defective Gaskets & O-rings Will Be Replaced
ML20086F9235 November 1975Telecopy AO 75-70:on 751104,reservoirs of Five Hydraulic Snubbers Found Empty.Cause Under Investigation.Corrective Action to Be Determined After Investigation
ML20086F92931 October 1975AO 75-69:on 751021,nitrogen Found to Leak Out of Test Connection on Inboard Flange of AO-2519.Caused by Use of Wrong Connection for Testing Double O-ring Seal.Connection Capped & Leak Checked Successfully
ML20086F93321 October 1975Telecopy AO 75-69:on 751021,O-ring Gasket Leak Discovered on Drywell & Torus Inerting Nitrogen Supply Valve AO-2519.Cause Under Investigation.Corrective Action to Be Determined After Investigation
ML20086F93831 October 1975AO 75-68:on 751021,O-ring Gasket Leak Discovered on Torus Purge Supply Valve AO-2521B.Caused by Use of Improper Connection for Testing Double O-ring Seal.Connection Capped & Leak Checked Successfully
ML20086F94421 October 1975Telecopy AO 75-68:on 751021,leak Found on O-ring Gasket on Torus Purge Supply Valve AO 2521A.Cause Under Investigation. Corrective Action to Be Determined After Investigation
ML20086F94921 October 1975Telecopy AO 75-67:on 751021,diesel Generator Breaker E-4 Inoperable.Caused by Inoperative Charging Motor Failing Due to Brush Wear.Breaker Replaced
ML20086F95230 October 1975AO 75-66:on 751020,APRM B Flow Bias Signal Failed Upscale. Caused by Internal Ground in Channel Flow Transmitter D Combined W/Installed Instrument Loop Ground,Lowering Total Loop Resistance.Defective Components Replaced
ML20086F95821 October 1975Telecopy AO 75-66:on 751020,logic Aprm/Rbm B Flow Bias Signal from FT-2-2-110D Failed Upscale.Caused by Failure of Second Ground on Recirculation Drive Flow Transmitter Signal Loop.Flow Signal Corrected
ML20086F96624 October 1975AO 75-65:on 751015,setpoints on Reactor High Pressure Scram Switches Found Less Conservative than Specified by Tech Specs.Caused by Instrument Setpoint Shift.Channel D Switch Recalibr,Tested & Returned to Svc
ML20086F97016 October 1975Telecopy AO 75-65:on 751015,setpoint on Reactor High Pressure Scram Switches Found to Be Less Conservative than Specified by Tech Specs.Caused by Instrument Setpoint Shift. Channel D Switch Recalibr,Tested & Returned to Svc
ML20086F9743 October 1975Telecopy AO 75-65:on 751015,alarm Received Indicating Sampling Sys Exhaust Pump Suction Low.Cause Under Investigation.Corrective Action to Be Determined After Investigation
ML20086F98110 October 1975AO 75-64:on 751002,upper Isolation Valve to LS-2-3-231C Found Closed.Caused by Technician Error.Technicians Involved Interviewed & Seriousness of Error StressedScram Discharge Volume
ML20086F9863 October 1975Telecopy AO 75-64:on 751002,upper Isolation Valve to LS-2-3-231C Found Closed.Caused by Technician Error. Technicians Involved Interviewed & Seriousness of Error StressedScram Discharge Volume
ML20086F98930 September 1975Telecopy AO 75-63:on 750929,outer Isolation Valves 86C & 86D Closed in 1.7 & 2.3 S,Respectively.Caused by Insufficient Hydraulic Fluid in Valve Actuator.Hydraulic Fluid Added & Adjustments Made to Closing Speed
ML20086F99319 September 1975Telecopy AO 75-61:on 750918,auto Close Function of TIP Machine Ball Valve Failed.Caused by Failure of Shield Limit Switch.Shield Limit Switch Inspected & Adjusted to Give Proper Operation Over Full Detector Travel
ML20086F99519 September 1975Telecopy AO 75-59:on 750918,TIP Machine Isolation Valve Failed to Close.Caused by Sticking or Binding in Ball Valve Solenoid Mechanism.Slight Mechanical Shock Applied to Valve Mechanism
ML20086F99729 August 1975AO 75-58:on 750821,setpoint of Torus to Reactor Bldg Vacuum Breaker Exceeded Prescribed Limit.Caused by Setpoint Drift. Differential Pressure Indicating Switch Calibr & Setpoint Check Found Repeatable
ML20086G00222 August 1975Telecopy AO 75-58:on 750821,setpoint of One Torus to Reactor Bldg Vacuum Breaker Exceeded Prescribed Limit.Cause Under Investigation.Operation of Differential Pressure Indicating Switch Being Checked & Will Be Corrected
ML20086G00627 August 1975AO 75-57:on 750817,reactor Recirculation Sys Outboard Sample Isolation Valve AO-2-2-40 Failed to Close During Test.Caused by Stuck Solenoid Valve.Solenoid Valve Disassembled & Cleaned
ML20086G01118 August 1975Telecopy AO 75-57:on 750817,reactor Recirculation Sys Outboard Sample Isolation Valve AO-2-2-40 Failed to Close During Testing.Caused by Stuck Solenoid Valve.Solenoid Valve Disassembled,Cleaned & Repaired
ML20086G02627 August 1975AO 75-56:on 750817,standby Gas Treatment Sys Fan OBV20 Failed to Auto Start.Caused by Switch DIS-00014 Stuck in Open Position.Corrective Maint Performed on Actuator Plate Hinge & Auto Start Mode for Fan B
ML20086G04818 August 1975Telecopy AO 75-56:on 750817,standby Gas Treatment Sys Fan OBV20 Failed to Auto Start.Cause Under Investigation. Corrective Maint Will Be Performed Subsequent to Identifying Problem
ML20086G0568 August 1975AO 75-55:on 750731,high Pressure Svc Water Pump 2A Failed to Start.Caused by Bent Breaker Cell Switch Support.Cell Switch Support Straightened,Breaker Racked in & Pump Tested Successfully
ML20086G06531 July 1975Telecopy AO 75-55:on 750731,high Pressure Svc Water Pump 2A Failed to Start.Caused by Bent Breaker Cell Switch Support. Cell Switch Straightened,Breaker Restored to Position & Pump Run Satisfactory
ML20086G08118 July 1975AO 75-52:on 750708,core Spray Pump C Room Cooler 2CV24 Tripped When Operated in Run Mode.Cause Attributed to Random Trip.No Corrective Action Necessary
ML20086G2708 January 1976AO 75-79:on 751229,local Leak Test Identified through- Leakage of B Loop RHR Torus Spray Valve MO-3-10-38B & Torus Cooling Return Valve MO-3-10-34B.Cause Under Investigation
ML20086G2725 January 1976AO 75-78:on 751226,drywell Radiation Monitor Inoperative. Caused by Flow Blockage in on Stream Sample Line.Sample Point Changed to Reestablish Sample Flow to Drywell Radiation Monitor
ML20086G27430 December 1975AO 75-76:on 751220-21,local Leak Rate Test Identified through-leakage on Loop a & B RHR Outboard Injection Valves MO-3-10-154A & B.Cause Not Determined.Inboard Isolation Valves Verified as Leaktight & Closed
ML20086G27830 July 1975AO 75-54:on 750720,stack Flow Transmitters Failed.Caused by Lightning Strike.Repair of Electronics Initiated.One Flow Transmitter Returned to Svc.Awaiting Placement Parts for Second Transmitter
ML20086G42230 September 1975AOs 50-277-75-62 & 50-278-75-61:on 750920,main Stack Flow Transmitters Failed.Caused by Lightning Strike.Damaged Components Replaced.Util Begun Study to Provide Permanent Resolution of Problem
ML20086G42622 September 1975Telecopy AOs 50-277-75-62 & 50-278-75-61:on 750920,main Stack Flow Transmitters Failed.Caused by Lightning Strike. Damaged Components Replaced
ML20086G43030 July 1975AOs 50-277-75-54 & 50-278-75-44:on 750720,stack Flow Transmitters Failed.Caused by Lightning Strike.Repair of Electronics Initiated
ML20086G43418 July 1975AOs 50-277-75-53 & 50-278-75-40:on 750709,control Room Emergency Ventilation Fan B Damper Solenoid Coil & Fan Control Power Transformer Failed.Caused by Excessive Air Leakage Past Seat & Plunger
ML20086G4367 July 1975Telecopy AOs 50-277-75-51 & 50-278-75-38:on 750703,stack Flow Transmitters Failed.Caused by Lightning Strike.Repair Operations Initiated.Repairs Delayed Until Afternoon of 750704 Due to Difficulty in Obtaining Parts
ML20086G43913 June 1975AOs 50-277-75-41 & 50-278-75-33:on 750605,main Stack Monitoring Particulate Filter & Charcoal Cartridge Out of Svc.Caused by Individual Not Closing Filter Bypass Valve After Draining Moisture from Line
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