Semantic search
Jump to navigation
Jump to search
| Issue date | Title | Topic | |
|---|---|---|---|
| ML20086B173 | 9 November 1976 | AO 50-267/74-20A:on 741116,during Low Power Physics Testing, Conflict Found Between Tech Specs 4.2.11 & 4.4.1 Re Moisture Limits.Caused by Last Minute Change in Tech Specs 4.2.11. Tech Specs Revised | |
| ML20086B178 | 9 November 1976 | AO 50-267/74-20A:on 741116,during Low Power Physics Testing, Conflict Found Between Tech Specs 4.2.11 & 4.4.1 Re Moisture Limits.Caused by Last Minute Change to Tech Specs 4.2.11. Tech Specs Revised | |
| ML20086B100 | 3 September 1976 | AO 50-267/74-21C:on 741121,high Pressure in Gas Waste Vacuum Tank Lifted Relief Valve Allowing Release of 700 Scf Uncontaminated Gas.Caused by Operator Error.Valves Will Be Replaced W/Kerotest Valves & Change Notice 91 Issued | |
| ML20086A044 | 28 May 1976 | Telecopy AO 76-012:on 760527,helium Circulator 1B Tripped Twice.Caused by Buffer Seal Malfunction.Sys Operating Procedure Will Be Revised | |
| ML20086A069 | 20 May 1976 | AO 76-011:on 760510,helium Circulator 1C Tripped Due to Negative buffer-midbuffer Differential Pressure.Cause Associated W/Test | |
| ML20086A087 | 3 May 1976 | Telecopy AO 76-010:on 760429 & 30,circulators 1A & 1B Tripped on Loss of Bearing Water.Caused by Operator Error | |
| ML20085M435 | 17 February 1976 | Telecopy AO 76/005:on 760227,loss of Essential 480-volt Bus 2 Caused Trip of Three Helium Circulators Due to Circulator Bearing Water Problems.Loss of 480-volt Bus Could Cause Temporary Loss of Forced Circulation | |
| ML20085M473 | 6 February 1976 | Telecopy AOs 76/03 & 76/04:on 760206,generator Set 1-B Load Breaker Would Not Close & Generator Set 1A Trouble Alarm Received,Indicating Partial Disconnection of Engine 1B from Generator.Causes Not Stated | |
| ML20085M565 | 22 December 1975 | AO 50-267/74/23A:on 741211,engine a of Standby Diesel Generator 1A Declutched During 2 H Surveillance Run & No Alarm Annunciated.Caused by Dirt Under Seat of Solenoid Valve.Plant Change Notice 12 Initiated | |
| ML20085M718 | 22 December 1975 | AO 50-267/75/15A:on 750709,during Repair of Minor Oil Leak on Gasoline Engine of Emergency Fire Pump,Inlet Manifold Piping Found Cracked.Caused by Component Failure.Manifold Repaired | |
| ML20086B154 | 18 December 1975 | AO 50-267/74-7A:on 740424,fuel Handling Machine Failed to Engage & Lift Reflector Element 09-06-R-01.Caused by Mfg Error.Reflectors de-burred & Ga Co Will Supply Two Column 1 Metal Clad Reflector Elements | |
| ML20085M563 | 18 November 1975 | AO 50-267/75/24:on 751108,static Seal on Helium Circulator B Inadvertently Released.Cause Presently Undetermined. Circulator B Brake & Seal Manually Set | |
| ML20085M621 | 21 October 1975 | AO 50-267/75/18A:on 750816,during Installation Preparation, Helium Circulation Damaged.Caused by Lack of Adherence to Approved Procedure.Personnel Counseled to Adhere to Approved Procedures & Supervision | |
| ML20085M571 | 26 September 1975 | AO 50-267/75/23:on 750916,essential Electrical Cable Discovered to Have Failed.Caused by Circumstances Associated W/Work in Progress.Damaged Cable Replaced | |
| ML20085M577 | 26 September 1975 | AO 50-267/75/22:on 750912,during Gas Waste Routine Release, Trouble W/Gas Vacuum Tank Observed by Reactor Operator.Cause of Malfunction Unknown.Failure Could Not Be Reproduced.No Further Action Planned | |
| ML20086B115 | 26 September 1975 | AO 50-267/74-21B:on 741121,high Pressure in Gas Waste Vacuum Tank Lifted Relief Valve Allowing Release of 700 Scf Uncontaminated Gas.Caused by Operator Error.Inlet Valve Seats Will Be Replaced W/Soft Seats | |
| ML20085M582 | 22 September 1975 | AO 50-267/75/21:on 750911,control Rod Drive Inserted Into Pcrv Rotated 180 Degrees from Required Orientation During Control Rod Drive Mod.Caused by Design & Procedure Error. Procedures Modified | |
| ML20085M618 | 5 September 1975 | AO 50-267/75/19:on 750825,engine a of Standby Generator a Automatically Shut Down & Declutched During Cooldown Portion of Weekly Surveillance Test.Caused by Difference in Fuel Rack Setting.Setting Changed | |
| ML20085M623 | 5 September 1975 | AO 50-267/75/18:on 750816,during Installation Preparation, Helium Circulator Damaged.Caused by Lack of Adherence to Approved Procedure.Personnel Counseled to Adhere to Approved Procedures & Supervision | |
| ML20085M612 | 5 September 1975 | AO 50-267/75/20:on 750826,12 Cord Sets Connecting Process Controllers at I-05 & I-06 Control Board to Cable Rack in Auxiliary Electric Equipment Room Switched.Caused by Malicious Mischief | |
| ML20085M678 | 15 August 1975 | AO 50-267/75/17:on 750808,instrument Air Compressor 1C Observed Running Continuously in Unloaded Condition.Caused by Component Failure.Failed Unloader Actuator Replaced W/New Unloader Actuator & Tested | |
| ML20085M702 | 21 July 1975 | AO 50-267/75/16:on 750610,when Engine B of Standby Generator a Dissassembled,Broken Rings,Scored Cylinders & Cracked Pistons Found.Caused by Water Engine.Engines Inspected.Pistons,Liners & Rings Replaced | |
| ML20085M725 | 18 July 1975 | AO 50-267/75/15:on 750709,during Repair of Minor Oil Leak on Gasoline Engine of Emergency Fire Pump Inlet Manifold, Piping Found Cracked.Caused by Component Failure.New Manifold Ordered & Defective Casting Replaced | |
| ML20085M740 | 11 June 1975 | AO 50-267/75/14:on 750530,engine B of a Diesel Generator Oversped to 1,900 Rpm While Electrical Overspeed Trip Being Set.Caused by Procedure Error.Test Procedure Changed | |
| ML20085L633 | 27 May 1975 | AO 75-267/75/13:on 750519,I-B Engine of I-A Standby Diesel Generator Failed to Start.Caused by Failure to Transmit Info That Engine Was Out of Svc to Adjust Overspeed Switches | |
| ML20085L648 | 12 May 1975 | AO 50-267/75/10:on 750501,exam Revealed Pin on Declutching Mechanism of Engine D of Standby Diesel Generator D Sheared Off.Caused by Inadequate Lubrication.Pin Replaced & Lubrication Frequency Increased | |
| ML20085L630 | 12 May 1975 | AO 50-267/75/9:on 750404,valve HV-2188-8 Did Not Open When Circulator Seal Release Permissive Circuit Directed Valve to Open.Cause Not Stated.Air Solenoids Inspected & Cleaned | |
| ML20085L787 | 7 May 1975 | AO 50-267/74-25:on 741018,diesel Engine B of Standby Generator a Tripped from High Water Jacket Temp on Routine Test.Caused by Improper Filling of Water Jackets.Personnel Counseled | |
| ML20085L641 | 7 May 1975 | AO 50-267/75/11:on 750424,preliminary Calculations Indicated That Helium Bottles Supplying Reserve Shutdown Sys Did Not Have Adequate Restraint for Dbe.Cause Not Stated.New Bottle Racks Designed & Installed | Design basis earthquake |
| ML20085L788 | 16 April 1975 | AO 50-267/74/24A:on 741222,static Seal on Helium Circulator a Released During Removal of Temporary Jumpers.Caused by Jumper Contact W/Station Ground | |
| ML20085L767 | 8 April 1975 | AO 50-267/75/3A:on 750123,dew Point Moisture Monitor Failed to Initiate Reactor Scram When Moisture Content Exceeded Trip Setpoint.Caused by Design & Procedure Inadequacies.New Procedure Developed | |
| ML20085L649 | 7 April 1975 | AO 50-267/75/9:on 750329,leak in Mechanical Seal of Helium Circulator B Discovered.Caused by Foreign Matl on Sealing Surfaces.No Corrective Actions Planned | |
| ML20085L683 | 2 April 1975 | AO 50-267/75/6A:on 750202,gas Waste Vacuum Tank Rupture Disc Ruptured,Releasing Small Quantity of Gas.Caused by Improper Closure of Air Operated Drain Valve Due to Foreign Matl on Valve Seat.Seat Repaired | |
| ML20086E165 | 21 March 1975 | AO 50-267/74/6A:on 750202,gas Waste Vacuum Tank Rupture Disc Ruptured,Releasing Small Quantity of Gas.Caused by Failure of Air Operated Drain Valve to Close Properly.Valve Repaired & Reinstalled | |
| ML20085L707 | 14 March 1975 | AO 50-267/75-4-A:on 750125,tritium Leaked from Secondary Closure of Refueling Region 1.Caused by Normal Presence of Tritium in Pressurizing Gas | |
| ML20085L651 | 7 March 1975 | AO 50-267/75/8:on 750224,diesel Engine B of Standby Generator a Failed to Function Properly During Weekly Test. Caused by Defective Temp Thermocouple.New Thermocouple Installed & Preventive Maint Program Instigated | |
| ML20085L658 | 4 March 1975 | AO 50-267/75/7:on 750121-23,reactivity Anamoly Occurred Due to Release of Hopper of Reserve Shutdown Mall Into Core. Cause Not Stated.Valve Seats Modified | Boric Acid |
| ML20086B068 | 26 February 1975 | AO 50-267/74-22A:on 741129,high Pressure in Gas Waste Vacuum Tank Blew Rupture Disc & Lifted Relief Valve Allowing Release of 750 Scf Uncontaminated Gas.Caused by Design Inadequacy.Pressure Indicator Installed | |
| ML20085L685 | 18 February 1975 | AO 50-267/75/6:on 750202,gas Waste Vacuum Tank Rupture Disc Ruptured,Releasing Small Quantity of Gas.Caused by Improper Closure of Air Operated Drain Valve.Valve Will Be Disassembled for Insp | |
| ML20085L701 | 17 February 1975 | AO 50-267/75/5:on 750127,gas Vacuum Tank Rupture Disc Ruptured,Releasing Small Quantity of Gas.Caused by Inadequate Procedures.Procedure Rewritten | |
| ML20085L712 | 14 February 1975 | AO 50-267/75/4:on 750125,tritium Leaked from Secondary Closure of Refueling Region 1.Cause Will Be Determined When Vessel Pressure Dropped to Atmospheric or Below | |
| ML20085L772 | 12 February 1975 | AO 50-267/75/3:on 750123,dew Point Moisture Monitors Failed to Initiate Reactor Scram When Moisture Content Exceeded Trip Setpoint.Caused by Failure of Sample of Primary Coolant to Reach Monitor.Tech Specs Revised | |
| ML20086B123 | 12 February 1975 | AO 50-267/74-21A:on 741121,high Pressure in Gas Waste Vacuum Tank Lifted Relief Valve Allowing Release of 700 Scf Uncontaminated Gas.Caused by Procedural Error.Inlet Valve Seats Will Be Replaced & Interim Procedure Modified | |
| ML20085L740 | 7 February 1975 | AO 50-267/75/1:on 750118,230-kV Breaker Tripped Due to High Winds,Causing Standby Diesel Generator a to Receive Start Signal.Generator B Did Not Receive Start Signal.Caused by Sensitive Relay Setting.Relay Recalibr | High winds |
| ML20085L727 | 31 January 1975 | AO 50-267/75/2:on 750113,reactor Bldg Exhaust Charcoal Filters Failed to Meet Tech Spec Leak Rate Requirements. Caused by Use of oil-based Paint & Organic Solvents.Filters Changed Out | |
| ML20085L650 | 25 January 1975 | AO 50-267/75/24A:on 741222,static Seal on C-2101 (Helium Circulator C) Released During Removal of Temporary Jumpers. Caused by Blown Fuse & Seal Release Valve Leak.All Circulator Brake & Seal Vent Valves Checked | |
| ML20085L734 | 24 January 1975 | Telecopy Ao:Charcoal in Reactor Bldg Exhaust Filters Failed to Meet Tech Spec Requirements | |
| ML20085L790 | 14 January 1975 | AO 50-267/74/24:on 741222,static Seal on C-2101 (Helium Circulator C) Released During Removal of Temporary Jumpers.Caused by Jumper Across Logic Circulator a Coming in Contact W/Station Ground | |
| ML20086B050 | 23 December 1974 | AO 50-267/74-23:on 741211,engine a of Standby Diesel Generator 1-A Declutched & No Alarms Annunciated.Caused by Cylinder Air Pressure Decay Due to Dirt Under Solenoid Valve Seat.Change Notice 11 Re in-line Filters Approved | |
| ML20086B064 | 19 December 1974 | Telecopy AO 50-267/74-23:on 741211,diesel Engine a of Standby Generator 1-A Declutched |