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| Issue date | Title | Topic | |
|---|---|---|---|
| ML20086D795 | 9 March 1973 | Updated AO 73-07:on 730302,steam Leak Noted Around Bonnet of Steam Exhaust Line Check Valve.Hpci Exhaust Stop Check Valve Gagged Shut,Check Valve Bonnet Gasket Replaced & Bonnet Retightened | |
| ML20086D803 | 5 March 1973 | AO 73-07:on 730302,steam Leak Noted Around Bonnet of Steam Exhaust Line Check Valve.Hpci Exhaust Line Stop Check Valve Gagged Shut,Check Bonnet Gasket Replaced & Bonnet Retightened | |
| ML20086D806 | 8 March 1973 | Updated AO 73-06:on 730302,chemist,while Attempting to Draw Offgas Sample,Discovered Improper Flow Through Offgas Sample/Monitoring Sys.Caused by Two Lines to Offgas Monitoring Sys Rolled During Mods | |
| ML20086D814 | 2 March 1973 | AO 73-06:on 730302,chemist,while Attempting to Draw Offgas Sample,Discovered Improper Flow Through Offgas Sample/ Monitoring Sys.Caused by Two Lines to Sys Rolled During Mods Made During Plant Outage | |
| ML20086D839 | 26 February 1973 | AO 73-05:on 730117,noble Gas Release Rate Exceeded Tech Spec Limit.Scram Resulted from Vessel Low Level Imposed by Feed Flow Transient Induced When Technician Returned Level Instrument Back to Svc After Surveillance Testing | |
| ML20086D847 | 26 February 1973 | AO 73-04:on 730116,feedback Signal to Recirculation Pump a Decreased,Causing Momentary Increase in Pump Speed.Caused by High Resistance,Normally Open,Relay Contact in Circuit Board.Relay Located,Tested & Replaced | Fuel cladding |
| ML20086D883 | 16 January 1973 | AO 73-03:on 730115,loop a Injection Valve Failed to Open, Rendering LPCI a Subsystem Inoperable.Caused by Valve Motor Being Unusually Warm & Motor Breaker Trip.Surveillance Conducted | |
| ML20086D886 | 22 January 1973 | Updated AO 73-02:on 730115,fan 1 on West Cooling Tower Failed in Forward Direction After Completion of Deicing Cycle.Caused by Bearing Failure in Reduction Gear Unit.Fan Disassembled & Angle Speed Reducer Drive Replaced | |
| ML20086D892 | 15 January 1973 | AO 73-02:on 730115,fan 1 on West Cooling Tower Failed in Forward Direction After Completion of Deicing Cycle.Caused by Bearing Failure in Reduction Gear Unit.Repair & Return to Normal Operation of Fan Expected by 730122 | |
| ML20086D895 | 15 January 1973 | AO 73-01:on 730109,during Reactor Startup from Cold Shutdown,No Indication Observed on Intermediate Range Monitor (IRM) Channels B,D & F While Increasing Power from Source Range Monitor Range to Irm.Caused by Blown Fuse | |
| ML20086D897 | 3 January 1973 | AO 72-20:on 721222,HPCI Inverter Tripped,Rendering HPCI Sys Inoperable.Trip Spurious & Not Related to Operational Conditions.Inverter Reset & Verified Operable | |
| ML20086D899 | 8 November 1973 | AO 73-31:on 731107,reactor Scram Occurred Based Upon High Flux Signal from Intermediate Range Neutron Monitoring Sys. Investigation Revealed Rod 30-23 Fully Withdrawn W/Rod 26-23 Withdrawn for Friction Test | |
| ML20086D905 | 10 October 1973 | Updated AO 73-29:on 731002,drywell High Pressure Switch Failed to Actuate at Required Setpoint.Caused by Instrument Drift.Switch Reset,Functionally Tested & Declared Operable | |
| ML20086D910 | 3 October 1973 | AO 73-29:on 731002,drywell High Pressure Switch Failed to Actuate at Required Setpoint.Switch Reset,Functionally Tested & Declared Operable | |
| ML20086D923 | 12 October 1973 | AO 73-30:on 731005,fuel Channel Insp Begun,Due to Discovery of Condition at Another Bwr.Initial Results Indicate of Seven Channels Inspected,Five Exhibit Signs of through-wall- Wear.Program for Ultimate Resolution Developed | |
| ML20086D926 | 5 October 1973 | AO 73-30:on 731005,fuel Channel Insp Begun,Due to Discovery of Condition at Another Bwr.Initial Results Indicate of Seven Channels Inspected,Five Exhibit Signs of through-wall- Wear.Further Insp in Progress | |
| ML20086D932 | 18 September 1973 | Updated AO 73-28:on 730910,microswitch Installed in Differential Pressure Indicating Switch 2-129B Failed to Actuate at Required Setpoint.Complete Assembly Replaced When Insp Revealed Excessive Binding in Switch Actuating Arm | |
| ML20086D935 | 11 September 1973 | AO 73-28:on 730910,microswitch Installed in Differential Pressure Indicating Switch 2-129B Failed to Actuate at Required Setpoint.Sensor Rendered Operable by Replacing Microswitch Assembly | |
| ML20086D939 | 17 September 1973 | Updated AO 73-27:on 730909,apparent Detonation in Offgas Sys Caused Sufficient Back Pressure to Fracture Air Ejector Rupture Disc,Thereby Degrading Boundary Designed to Contain Radioactive Matl | |
| ML20086D945 | 10 September 1973 | AO 73-27:on 730909,apparent Detonation in Offgas Sys Caused Sufficient Back Pressure to Fracture Air Ejector Rupture Disc,Thereby Degrading Boundary Designed to Contain Radioactive Matl | |
| ML20086D950 | 11 September 1973 | Updated AO 73-26:on 730903,apparent Detonation in Offgas Sys Caused Sufficient Back Pressure to Fracture Air Ejector Rupture Disc,Thereby Degrading Boundary Designed to Contain Radioactive Matls | Loop seal |
| ML20086D958 | 4 September 1973 | AO 73-26:on 730903,apparent Detonation in Offgas Sys Caused Sufficient Back Pressure to Fracture Air Ejector Rupture Disc,Thereby Degrading Boundary Designed to Contain Radioactive Matls | |
| ML20086D967 | 7 September 1973 | AO 73-25:on 730831,during Severe Electrical Storm in Which Direct Lightning Strike to Top of Plant Ventilation Stack Observed,Both Plant Gas Monitoring Sys & Area Gamma Radiation Monitors on Fence Became Inoperable | Loop seal |
| ML20086D972 | 31 August 1973 | AO 73-25:on 730831,during Electrical Storm in Which Direct Lightning Strike to Top of Plant Ventilation Stack Observed, Both Plant Stack Gas Monitoring Sys & Area Gamma Radiation Monitors on Perimeter Fence Became Inoperable | |
| ML20086D979 | 22 August 1973 | Updated AO 73-24:on 730816,instrument Lines Monitoring Suppression Chamber Pressure Found Incorrectly Tubed to Differential Pressure Sensors Which Activate Breaker Operation,Causing Actuation | |
| ML20086D992 | 17 August 1973 | AO 73-24:on 730816,instrument Lines Monitoring Suppression Chamber Pressure Found Incorrectly Tubed to Differential Pressure Sensor Which Activates Breaker Operation,Causing Actuation W/Positive Pressure | |
| ML20086D998 | 9 August 1973 | Updated AO 73-23:on 730802,gamma Radiation Monitor on Perimeter Fence Became Inoperable.Caused by Power Supply Associated W/Monitor Failing,Causing Immediate Downscale Indication.Component Replaced & Monitor Returned to Svc | |
| ML20086E001 | 3 August 1973 | AO 73-23:on 730802,gamma Radiation Monitor on Perimeter Fence Became Inoperable.Caused by Power Supply Associated W/ Monitor Failing,Causing Immediate Downscale Indication. Efforts to Determine Cause of Failure Currently in Progress | |
| ML20086E009 | 7 August 1973 | Updated AO 73-22:on 730730,source Calibr of Radiation Monitors Associated W/Reactor Bldg Vent Exhaust Duct & Refueling Floor Zone Discovered Not Performed Since 720408. Monitors Calibr Upon Discovery of Omission | |
| ML20086E015 | 31 July 1973 | AO 73-22:on 730730,source Calibr of Radiation Monitors Associated W/Reactor Bldg Vent Exhaust Duct & Refueling Floor Zone Found Not Performed Since 720408.Monitors Calibr Upon Discovery of Omission | |
| ML20086E045 | 9 June 1975 | AO 75-12:on 750609,standby Liquid Control Pump B Delivered High Flow Rate.Cause Under Investigation | |
| ML20086E072 | 12 May 1975 | AO 75-11:on 750511,intermediate Range Monitor Channel E Failed to Respond to Increasing Neutron Flux Level.Cause Not Stated.Reactor Protection Sys Trip Sys a Manually Tripped | |
| ML20086E081 | 19 July 1973 | Updated AO 73-21:on 730711,microswitch Installed in DPIS-2-129B Failed to Actuate at Required Setpoint.Vendor Contacted to Reiterate Need for Improving Design of Actuating Arm Bearing.Actuating Arm Realigned | |
| ML20086E101 | 12 July 1973 | AO 73-21:on 730711,microswitch Installed in DPIS-2-129B Failed to Actuate at Required Setpoint.Channel Made Operable by Realigning Actuating Arm & Rechecking Trip Point Actuation | |
| ML20086E116 | 10 July 1973 | Updated AO 73-20:on 730706,drywell Purging & Vent Exhaust Valve V16-19-7A Would Not Close.Mechanical Binding Will Be Investigated & Valve Overhauled During Future Shutdown.Valve Presently Deactivated in Closed Position | |
| ML20086E124 | 6 July 1973 | AO 73-20:on 730706,drywell Purging & Vent Exhaust Valve V16-19-7A Would Not Close.Inoperability Exceeded Limiting Conditions for Operation.Reactor Shut Down & Cooling Down at Time of Incident | |
| ML20086E145 | 30 April 1975 | AO 75-10:on 750429,low Water Level Switch Associated W/ Differential Pressure Indicating Sensor 2-3-58B Actuated Low.Switch Adjusted | |
| ML20086E155 | 8 April 1975 | AO 75-08:on 750408,air Ejector Suction Valve Isolation Time Delay Relay Timer 17-157A Actuated Slow.Cause Not Stated. Timer Reset | |
| ML20086E222 | 21 February 1975 | AO 75-05:on 750220,sample Accumulator Isolation Valve to Condenser OG-9069 Found Shut,Rendering Radiation Monitors Inoperable.Cause Not Stated.Valve Immediately Opened | |
| ML20086E244 | 5 February 1975 | AO 75-04:on 750204,gradual Flow Reduction Discovered in Air Ejector Offgas Monitoring Sys.Caused by Removal of 3-way Solenoid Valve for Cleaning & Repair.Valve Replaced | |
| ML20086E346 | 5 February 1975 | AO 75-03:on 750204,spray Sys Pump Discharge Pressure Sensor PS-14-44A Actuated at 82 Psig,Below Tech Spec Min. Sensor Replaced & Calibr | |
| ML20086E385 | 9 January 1975 | AO 75-02:on 750108,personnel Discovered That Carbon Filter Beds Changed on Standby Gas Treatment Sys Train a Instead of Planned Train B.Carbon Beds in Train B Replaced | |
| ML20086E388 | 9 January 1975 | AO 75-01:on 750108,LPCI Low Reactor Pressure Permissive Switches on Instrument 2-3-52D Actuated High.Caused by Improper Calibr Technique.Switch Reset | |
| ML20086E400 | 16 December 1974 | AO 74-16:on 741214,containment Air Sampling Sys Found Inoperable.Caused by Nonfunctioning Heat Tracing Circuit.Sys Repaired | |
| ML20086E407 | 20 December 1974 | AO 74-17:on 741219,suppression Chamber Outboard Sample Valve Stuck in Open Position.Caused by Accumulation of Dirt Causing Binding of Solenoid Piston.Valve Cleaned | |
| ML20086E408 | 3 December 1974 | AO 74-15:on 741202,scram Discharge Vol High Level Scram Switch 3-231A Would Not Actuate Respective Scram Relay. Caused by Fissure in Switch Casement.Switch Replaced | Scram Discharge Volume |
| ML20086E411 | 16 October 1974 | AO 74-14:on 741015,primary Containment Leak Discovered. Caused by Missing 1/2-inch Test Connection Plug on Drywell Penetration X-16A.Plug Installed | |
| ML20086E418 | 15 July 1974 | AO 74-11:on 740705,08 & 09,both Plant Stack Monitoring Sys Failed.Caused by Direct Lightning Strikes to Ventilation Stacks During Electrical Storms.Radiation Exposure to Personnel Negligible | Grab sample |
| ML20086E428 | 8 July 1974 | AO 74-11:on 740705,both Plant Stack Monitoring Sys Failed Following Direct Lightning Strike During Severe Electrical Storm.Generator Turbine Tripped Causing Reactor Scram.Repair of Damaged Equipment Complete | |
| ML20086E432 | 3 July 1974 | AO 74-10:on 740626,HPCI Inverter Tripped,Rendering HPCI Sys Inoperable.Caused by Poor Connection Between Printed Circuit Board & Companion Jack.Connections Cleaned |