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| Issue date | Title | Topic | |
|---|---|---|---|
| ML20084H811 | 15 May 1974 | AO BFAO-7425W:on 740505,HPCI Sys Failed to Deliver Water to Reactor When Initiated on Low Water Level After Reactor Scram.No Absolute Cause Determined.Possibly Caused by Overspeed Trip of Machine | |
| ML20084H818 | 6 May 1974 | Telecopy AO BFAO-7425T:on 740505,HPCI Sys Failed to Deliver Water to Reactor When Initiated on Low Water Level Following Reactor Scram.Apparently Caused by Overspeed Trip.Sys Restarted Manually & Performed Satisfactorily | |
| ML20084H826 | 23 May 1974 | AO BFAO-7419W:on 740429,plant Exceeded ETS Limit of 5 F River Temp License.Apparently Caused by Natural Difference in Temp of Water Between Upstream & Downstream Monitors at 5-ft Depth,Due to Diurnal Solar Heating | |
| ML20084H834 | 19 April 1974 | AO BFAO-7424W:on 740403,unit Tripped Due to Transmission Interruptions.Caused by Tornados.One 161-kV Line Lost.No Known Corrective Actions | |
| ML20084H843 | 23 April 1974 | AO BFAO-7423W:on 740413,HPCI Failed to Reach Rated Flow in Required Time During Performance of post-maint Testing at Rated Pressure.Caused by Defective 10,000-ohm Coverter Zero Potentiometer in Combined Ramp Generator & Signal Converter | Safe Shutdown |
| ML20084H852 | 15 April 1974 | Telecopy AO BFAO-7423T:on 740414,HPCI Failed to Reach Rated Flow in Required Time.Hpci Returned to Svc After Satisfactory Testing | |
| ML20084H868 | 12 April 1974 | AO BFAO-7422W:on 740404,damage Discovered to HPCI Turbine Steam Supply Piping Hanger Support Rods,Piping Restraints, Steam Supply Valve FCV 73-16 Limit Switches & Turbine Inboard Bearing Pedestal.Cause by Slug of Water | |
| ML20084H881 | 12 April 1974 | AO BFAO-7421W:on 740403,diesel Engine D Failed to Start W/Right Bank of Air Start Motors During Surveillance Test of Diesel Generator Redundant Air Start Sys.Caused by Starter Failure Due to Rust & Possible Lack of Adequate Lubrication | |
| ML20084H884 | 5 April 1974 | Telecopy AO BFAO-7421T:on 740403,start Circuit 2,right Bank of D Diesel,Failed to Start Engine During Surveillance Testing of Diesel Generator Redundant Start Sys | |
| ML20084H889 | 4 April 1974 | AO BFAO-7420W:on 740325,rod Sequence Control Sys Malfunctioned.Caused by Failed Integrated Circuit.Failed Sequence Logic Board Replaced & Rod Sequence Control Sys Logic Tested Satisfactorily | |
| ML20084H892 | 29 March 1974 | AO BFAO-7419W:on 740321,diesel Generator a Made Inoperable for 5 H W/O Previous Testing of Eccs.Caused by Personnel Error.Detailed Discussion of Tech Specs Held W/Personnel | |
| ML20084H894 | 27 March 1974 | AO BFAO-7418:on 740318,RCIC Failed to Reach Rated Flow within Required Time After Manual Initiation.Caused by Malfunction of Egm Control Box Due to Low Power Supply Voltage | |
| ML20084H897 | 26 April 1974 | Amend to AO BFAO-7417W Re 740315 Failure of Suppression Chamber to Drywell Vacuum Breaker Valve FCV 64-28M to Close Fully | |
| ML20084H900 | 25 March 1974 | AO BFAO-7417W:on 740315,suppression Chamber to Drywell Vacuum Breaker Valve FCV 64-28M Failed to Close Fully as Indicated by Check Light.Cause Unknown Until Valve Can Be Investigated | |
| ML20084H903 | 12 September 1974 | AO BFAO-7416W:on 740312,HPCI Egm Box Failed.Caused by Defective Transistor.Transistor Replaced | |
| ML20084H908 | 21 March 1974 | AO BFAO-7416W:on 740312,HPCI Turbine Failed to Reach Rated Speed & Flow During Surveillance Testing.Apparently Caused by Inability of Governor to Respond.Cause Being Investigated | Safe Shutdown |
| ML20084H912 | 13 March 1974 | Telecopy AO BFAO-7416T:on 740312,HPCI Turbine Failed to Reach Rated Speed During Manual Initiation Test. Investigation Underway to Determine Cause | |
| ML20084T966 | 26 April 1976 | Telecopy AO BFAO-50-259/763T Re Potential Design Deficiency. Power Supplies to Standby Liquid Control Pumps Locked Out Until Accident Signal Cleared or Normal Voltage Restored to Shutdown Boards | |
| ML20084T969 | 23 January 1976 | AOs BFAO-50-259/761W & BFAO-50-260/762W:on 760114,diesel Generator D Failed Monthly Surveillance Test.Caused by Failure of Hydraulic Actuator to Respond Properly to Signals from Electrical Governor | |
| ML20084T975 | 15 January 1976 | Telecopies AO BFAO-50-259/761T & BFRO-50-260/762T:on 760114, Diesel Generator D Failed Monthly Surveillance Test.Caused by Mechanical Governor Problems | |
| ML20084U415 | 6 July 1973 | AO BFAO-731W:on 730628,refueling Interlock Failed.Caused by Switch Being Loosened or Misaligned When Switch Actuating Arm Passed Over Power Cable Which Had Caught Under Platform Frame.Switch Readjusted | |
| ML20084U427 | 29 June 1973 | Telecopy AO BFAO-731T:on 730628,rod Permissive Light Remained Lit When Loaded Fuel Grapple Moved Over Reactor Pressure Vessel.Caused by Limit Switch Adjustment on Refueling Platform.Switch Readjusted & Functionally Tested | |
| ML20085E938 | 10 October 1975 | AO BFAO-50-259/75-10W:on 751001,diesel Generator Power Supply Unavailable Automatically to RHRSW Pump Running Continuously to Supply Water.Caused by Commencement of Mod Second Phase Prior to Completion of First Phase | |
| ML20085E955 | 9 July 1975 | AO BFAO-50-260/759T:on 750709,broken Stem Found on second- Stage Pilot of Main Steam Release Valve 1.Break Point Just Under Lock Nut Above Actuating Piston.Site Inspector Advised | |
| ML20085E963 | 18 July 1975 | AO BFAO-50-260/759W:on 750322,during Second Stage Relief Valve Testing & Refurbishing,Piston & Stem Locknut Found Loose in Air Actuator Chamber on Valve 2 PCV-1-31.Stem & Nut Drilled Twice.New second-stage Stem Installed | |
| ML20085E976 | 28 May 1975 | Telecopy Message of AO BFAO-50-259/759T:on 750527,signal Cable Inadvertently Disconnected,Making a & B Source Range Monitors Unavailable.Cables Reconnected & Function Restored | |
| ML20085E978 | 30 May 1975 | AO BFAO-50-259/758W:on 750521,diesel Generator a Failed to Start During Routine Surveillance Test.Caused by Rust & Grit in Starters Due to Moisture in Air Sys & Inadequate Lubricator Operation.Airline Strainers Cleaned | |
| ML20085E982 | 22 May 1975 | Telecopy Message of AO BFAO-50-259/758T:on 750521,diesel Generator a Failed to Start During Routine Surveillance Test.Air Motors Changed & Testing Accomplished | |
| ML20085E985 | 30 May 1975 | AO BFAO-50-260/757W:manual Valve in Drive Water Supply on Control Rod Drive Module 50-15 Found in Open Position.Cause Unknown.Valve Repositioned to Required Closed Position | |
| ML20085E996 | 21 May 1975 | Telecopy Message of AO BFAO-50-260/757T:on 750520,A Drive Water Supply Valve to Control Rod Drive Found Opened During Surveillance Instruction Performance | |
| ML20085F022 | 27 March 1975 | AO BFAO-50-259/755W:on 750318,one Less Senior Reactor Operator Was on Shift than Required Per Tech Spec.Caused by Scheduling Error.Weekly Shift Schedule Revised to Indicate Licenses Held by Personnel | |
| ML20085F024 | 25 April 1975 | AO BFAO-50-259/757W:on 750416,LPCI Injection Valve FCV-74-52 Became Inoperable Electrically.Caused by Bolt Fatigue Failure Due to Vibration,Resulting from Loose Bolts Securing Drive Motor to Valve.Spare Motor Installed | |
| ML20085F030 | 17 April 1975 | Telecopy Message of AO BFAO-50-259/757T:on 750416,drive Motor Support Bolts Sheared Off LPCI Injection Valve FCV-74-52,making Valve Inoperable Electrically | |
| ML20085F035 | 25 January 1975 | Telecopy Message of AO BFAO-50-260/754T:on 750123,insp Revealed That Four Bergen-Paterson Arrestors Had Lost Hydraulic Oil & Ability to Function | |
| ML20085F036 | 5 February 1975 | Telecopy Message of AO BFAO-50-260/755T:on 750205,D Diesel Generator Undervoltage Start RHR Svc Water Pump D1,RHR Pumps 1D & 2D & Core Spray Pumps 1D & 2D Auto Start Feature Found Inoperable for 39 H During Battery Capacity Discharge Test | |
| ML20085F037 | 31 January 1975 | AO BFAO-50-260/754W:on 750123,four Bergen-Paterson Arrestors Found W/Unacceptable Low Amount of Oil Present During Shock Arrestor Insp.Caused by Small Nick in Sealing Surface of Accumulator Piston Seal.Recommended Seals & O-rings Used | |
| ML20085F038 | 7 February 1975 | Telecopy Message of AO BFAO-50-259/752T:on 750205,small Leak Discovered in 3/4-inch Carbon Steel Test Connection Outside Containment Boundary During Functional Test of Core Spray Piping Loop 2 | |
| ML20085F042 | 15 February 1975 | AO BFAO-50-259/752W:on 750205,crack Found in 3/4-inch Carbon Steel Test Line on Core Spray Loop II Fullflow Pump Test Loop.Caused by Metal Fatigue Due to Test Connection Line Vibration.Crack Ground Out & Repaired by Welding | |
| ML20085F678 | 20 March 1975 | AO 50-259/754W:on 750310,while Running Routine Surveillance Test,High Concentrations of Oxygen Discovered in Drywell. Caused by Mixing of Air Retained in Stagnant Areas of Drywell During Initial Purge & Sampling | |
| ML20085F741 | 7 March 1975 | AO BFAO-50-259/753W:on 750226,main Steam Relief Valve PCV-1-4 Lifted Prematurely & Did Not Reseat Until Reactor Pressure Reached 480 Psig.Cause Unknown.Leakage Suspected. Valves Replaced | |
| ML20085G000 | 9 November 1973 | AO BFAO-7332W:on 731031,HPCI Condensate Header Low Level Switch LS-73-56A Exceeded Tech Spec Trip Level.Switches Replaced w/1/2-ampere Switch Contacts.New Switches Will Be Replaced W/Original Type Upon Delivery | |
| ML20085G001 | 2 November 1973 | AOs Bf EAO-7337W-7343W:on 731024-31,fish Killed When Impinged on Intake Screens.Caused by Washing Circulating Water Pump Traveling Screens.Estimate of Number of Fish Impinged on Each Day of Occurrence Submitted | |
| ML20085G005 | 3 March 1975 | AO BFAO-50-260/756W:on 750221,120-volt Power Supply to RCIC Flow Controller & Suppression Pool Level & Drywell Pressure Indicators Lost.Caused by Mispositioning of 120-volt Selector Switch XS-57-170 to Off Position | |
| ML20085G024 | 2 November 1973 | AO BFAO-7331W:on 731025,turbine Condenser Low Vacuum Switches PS-2-1A & PS-2-1B Setpoints of 22.75 & 22.8, Respectively,Did Not Meet Tech Spec Requirement.Switches Inspected & Reset.Test Frequency Increased to Biweekly | |
| ML20085G034 | 26 October 1973 | Telecopy AO BFAO-7331T:on 731025,turbine Condenser Low Vacuum Switches PS-2-1A & PS-2-1B Setpoints of 22.75 & 22.8, Respectively,Did Not Meet Tech Spec Limit | |
| ML20085G041 | 22 October 1973 | Telecopy AO BFEAO-7334T:on 731021-22,listed Fish Impinged on Intake Screens | |
| ML20085G046 | 14 February 1975 | AO BFAO-50-260/755W:on 750205,4-kv Shutdown Board D Emergency Control Bus 250-volt Dc Power Supply Lost.Caused by Inadequate Battery Discharge Surveillance Instruction. Changed Instruction Includes Transferance Step | |
| ML20085G048 | 24 October 1973 | AOs Bf EAO-7331-7336:on 731014 & 17-23:fish Killed When Impinged on Intake Screens.Incidents Occurred While Washing Circulating Water Pump Traveling Screens.Number of Fish Impinged on 731013 Revised | |
| ML20085G085 | 29 January 1975 | AO BFAO-50-26/753W:on 750119,relief Valve PCV-1-4 Operated Spuriously Several Times.Caused by second-stage & pilot- Stage Leakage Due to Indentation in Seat & Disc.Relief Valve Replaced | |
| ML20085G097 | 24 January 1975 | AO BFAO-50-260/752W:on 750116,RCIC Turbine Tripped.Caused by Misposition of Mechanical Overspeed Emergency Tappet Nut. Nut Rotated for Proper Alignment W/Emergency Head Lever |