ML20085G860
| ML20085G860 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 10/25/1974 |
| From: | Eric Thomas TENNESSEE VALLEY AUTHORITY |
| To: | Case E US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 8308290467 | |
| Download: ML20085G860 (3) | |
Similar Documents at Browns Ferry | |
|---|---|
Category:ABNORMAL OCCURRENCE REPORTS (SEE ALSO LER & RO)
MONTHYEARML20084T9661976-04-26026 April 1976
[Table view]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 ML20084T9691976-01-23023 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 ML20084T9751976-01-15015 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 ML20085E9381975-10-10010 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 ML20085E9631975-07-18018 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 ML20085E9551975-07-0909 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 ML20085E9781975-05-30030 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 ML20085E9851975-05-30030 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 ML20085E9761975-05-28028 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 ML20085E9821975-05-22022 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 ML20085E9961975-05-21021 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 ML20085F0241975-04-25025 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 ML20085F0301975-04-17017 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 ML20085F0221975-03-27027 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 ML20085F6781975-03-20020 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 ML20085F7411975-03-0707 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 ML20085G0051975-03-0303 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 ML20085G6681975-02-19019 February 1975 Followup Rept of AO BFAO-50-260/7432W:on 741204,shutdown Cooling Flow Control Valve FCV-74-66 Failed to Allow Waterflow Passage.Caused by Broken Tack Welds.Welds Ground Off & Large Fillet Welds Rewelded ML20085F0421975-02-15015 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 ML20085G0461975-02-14014 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 ML20085G2271975-02-10010 February 1975 AO BFAO-50-259/751W:on 750131,time for RHRSW Pump D1 Start Sequence Time Delay Relay TD1-D Improperly Set.Caused by Inadvertent Moving of Timer Dial Setting Since Previous Surveillance Test.Relay Recalibr ML20085F0381975-02-0707 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 ML20085F0361975-02-0505 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 ML20085F0371975-01-31031 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 ML20085G0851975-01-29029 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 ML20085F0351975-01-25025 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 ML20085G0971975-01-24024 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 ML20085G9561975-01-17017 January 1975 Updated AO BFAO-50-259/7453W Re Loss of Position Indication on Suppression Chamber to Drywell Vacuum Breakers.Electrical Checks in Torus Suppression Chamber Showed Grounded Conductors in Inside Torus Penetration Connector ML20085G1131975-01-17017 January 1975 AO BFAO-50-260/751W:on 750107,RCIC Failed to Operate After Planned Turbine Trip.Caused by Electronic Overspeed Trip Due to Dropping Resistor Open Circuiting in Resistor Box. Resistor Replaced & Voltage Verified ML20085G5961975-01-0606 January 1975 AO BFAO-50-259/7461W:on 741227,dampening Pins in Main Steam Line high-flow Pressure Switch Snubbers Installed W/O Proper Review & Authorization.Caused by Personnel Error. Procedures Revised ML20085G6071975-01-0303 January 1975 AO BFAO-50-259/7460W:on 741224,offgas Radiation Monitor Found Inoperable.Caused by Abnormal Leakage of Local Offgas Sample Flow Rotometer Due to Failure of O-ring to Seal properly.O-ring Reassembled ML20085G1611974-12-27027 December 1974 AO BFAO-50-260/7436W:on 741218,drywell Sampling Monitor Found 2-RM-90-256 Inoperable.Caused by Failure of Four 150- Watt Bulbs Used for Heating Monitor Internals.Permanent Heating Sys in Drywell Requested ML20085G2391974-12-27027 December 1974 AO BFAO/50-260/7435W:on 741218,flow Control Valve 2-FCV-74-66 on RHR Sys Loop II Failed to Open.Caused by Loose Locknut Due to Missing Set Screws in Yoke Nut Bearing Locknut.Spare Motor Operator Installed ML20085G6401974-12-23023 December 1974 AO BFAO-50-259/7459W:on 741213,secondary Containment Isolation Damper Solenoid Valves Failed.Caused by Sticking Pilot Valves.Solenoid Valves Replaced ML20085G7311974-12-20020 December 1974 Addl Info Re AO BFAO-50-260/7425W.Inlet & Outlet Valves for Two of Three Cylinders Found in Satisfactory Condition. Remaining Cylinder Badly Pitted.Valves Refaced & Lapped in ML20085G4301974-12-18018 December 1974 AO BFAO-50-260/7434W:on 741208,leak Indications Found on Main Steam Relief Valve Bellows 2-PCV-1-41 & 2-PCV-1-5. Caused by Shorted Cable Due to Melted Cable Insulation. Caused Repaired ML20085G4061974-12-13013 December 1974 AO BFAO-50-260/7431W:on 741203,HPCI Automatically Initiated Due to Low Reactor Water Level.Cause Not Determined. Corrective Actions Under Investigation ML20085G6611974-12-13013 December 1974 AO BFAO-50-260/7432W:on 741204,shutdown Cooling Flow Control Valve FCV-74-66 Failed to Allow Waterflow Passage.Caused by Loosened Valve Disc.Valve Repaired ML20085G2611974-12-12012 December 1974 AO BFEAO-7422W:on 741202,water Temps in Wheeler Reservoir Not Recorded.Caused by Failure in Computer Controlling of Data Collection.Standby Computer Spare Memory Board Interchanged W/Existing Memory Board ML20085G7081974-12-0606 December 1974 AO BFAO-50-259/7458W:on 741126,main Stack Gas Radiation Monitoring Sys Found Inoperable.Caused by Excess Water in Sys Due to Isolation Valve Leakage from Demineralized Water Back Flushing Connection ML20085G2661974-12-0404 December 1974 AO BFAO-50-260/7429W:on 741124,main Steam Relief Valve FCV-1-31 Failed to Reset Properly After Manually Opened. Caused by Excessive Pilot Valve Leakage.Valve Replaced. Installation Monitored ML20085G1261974-11-29029 November 1974 AO BFAO-50-260/7427W:on 741121,core Spray Injection Valve 2-FCV-75-53 Failed to Open.Caused by Jammed Valve Due to Misadjustment of Closing Limit Switch on Valve Operator. Opening & Closing Limit Switches Adjusted ML20085G8191974-11-25025 November 1974 AO BFAO-50-259/7456W:on 741115,RCIC Tripped on Overspeed During Auto Initiation.Caused by Servo Out of Alignment W/Governor Level.Servo Adjusted ML20085G7571974-11-14014 November 1974 AO BFAO-50-260/7424W:on 741104,HPCI Sys Inoperable Due to Blown Head Gaskets on Gland Steam Condenser & Flooding of Gland Steam Condenser Hotwell Pump Motor.Cause Unknown. Upper & Lower Condenser Head Gaskets Replaced ML20085G8361974-11-0707 November 1974 AO BFAO-50-260/7422W:on 741030,rod Sequence Control Sys Operability Not Verified Before Decrease Below 20% Power. Caused by Recirculation Pumps Run Back Due to Low Feedwater Flow Switch Actuating Prematurely ML20085G8431974-11-0707 November 1974 AO BFAO-50-259/7455W:on 741031,max Linear Heat Generation Rate Calculated Higher than Allowable Limit.Caused by Inadequate Margin Allowed in Max Linear Heat Generation Before TIP Set ML20085G8351974-11-0101 November 1974 AO BFAO-50-260/7423W:on 741101,main Steam Line B Outboard Isolation Valve FCV 1-27 Failed to Close within Required Time.Cause Unknown.Steam Line Isolated & Normal Shutdown Operations Continued ML20085G8601974-10-25025 October 1974 AO BFAO-50-260/7421W:on 741017,two Offgas HEPA Filters Not Installed Before Startup,Contrary to Section 9.4 of Fsar. Caused by Personnel Error.Filter Sample Lines Blown Out W/Station Air.New Filters Installed ML20085G8611974-10-25025 October 1974 AO BFAO-50-260/7420W:on 741017,during Planned Insp of Hydraulic Piping restraints,Bergen-Paterson Hydraulic Shock & Sway Arrestors Found W/Unacceptably Low Oil Levels.Caused by Seal Nicks Due to Burrs on Piston Rod End ML20085G8891974-10-25025 October 1974 AO BFAO-50-260/7419W:on 741015,2-inch Schedule 80 Stainless Steel Equalizing Line Appurtenant to 22-inch Crosstie Piping Between Two Reactor Coolant Recirculation Pump Loops Suffered Fatigue Failure.Caused by Excessive Vibration 1976-04-26 Category:TEXT-SAFETY REPORT MONTHYEAR05000260/LER-1999-010, :on 990917,automatic Reactor Scram on Turbine Stop Valve Closure Occurred.Caused by High Water Level in Main Steam Moisture Separator 2C2.Unit 2C2 Reservoir Level Transmitter & Relays Were Replaced & Tested Satisfactorily1999-10-15015 October 1999
[Table view]
1999-09-30 |