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| Issue date | Title | Topic | |
|---|---|---|---|
| ML20090C433 | 29 December 1975 | AO-75-09:on 751123-29,licensee Failed to Analyze Stack Cartridges Weekly.Technician Reinstructed | |
| ML20090C455 | 28 November 1975 | AO-75-032:on 751117,acid Leak Occurred in Makeup Demineralizer Acid Storage Tank.Caused by Partially Open Discharge Valve.Valve Repaired | |
| ML20090C449 | 26 November 1975 | AO-75-031:on 751114,both Radiation Monitors in Reactor Bldg Ventilation Duct Failed to Provide Transfer to Emergency Ventilation Sys at 5 M/H.Caused by Incorrect Adjustment Made Prior to Calibr | |
| ML20090D890 | 29 August 1975 | AO 50-220/75-23:on 750826,during Audit of Contractor Facility Used in Analyzing Milk Samples,Required Sensitivity Not Achieved.Caused by Inadequate Procedure.Contractor Informed That Milk Counting Time Must Increase | |
| ML20090E041 | 2 April 1975 | AO 50-220/75-05:on 750401,during Routine Surveillance Testing,Emergency Vent Sys Failed to Function When Sys Inlet Ventilation Valve Bv 202-36 Failed to Open.Caused by Broken Stem in Solenoid Valve.Solenoids Will Be Replaced | |
| ML20090E158 | 6 January 1975 | AO 50-220/74-17:on 741227,source Range Monitor 14 Declared Inoperable.Caused by Component Failure.Detector Replaced W/Spare | |
| ML20090E161 | 19 December 1974 | AO 50-220/74-16:on 741210,intermediate Range Monitor 12 Found Inoperable.Cause Apparently Due to Defect in Cable or Detection.Repair Will Be Conducted on Sys | |
| ML20090E163 | 17 December 1974 | AO 50-220/74-15:during Markup of Motor Generator 167, Operator Tripped Supply Breaker for Power Board.Caused by Operator Error.Operator Educated in Proper Procedures. Training Sessions for All Operators Conducted | |
| ML20090E159 | 10 December 1974 | Ao:On 741110,fuel Channel Deflections Indicated Increase in Core Bypass Flow Over Calculations Assumed in Original Design.Channels Will Be Replaced.Finger Springs Will Be Used to Control Leakage | |
| ML20090E165 | 27 November 1974 | AO 50-220/74-14:on 741120,during Mgt Review of Monthly Surveillance Tests,Station Batteries Found Not Tested at Specified Intervals.Caused by Misinterpretation of Requirements by Maint Foreman.Foreman Notified | |
| ML20090E166 | 20 September 1974 | AO 74-13:on 740918,during Routine Testing,Containment Spray Pump Found Inoperable.Caused by Foreign Object Restricting Suction Flow of Pump.Object Removed | |
| ML20090E168 | 28 August 1974 | AO 50-220/74-12:on 740824,during Surveillance Testing,One Barton Instrument Used in Drywell High Pressure Reactor Protection Sys Drifted High.Caused by Setpoint Drift. Switch Recalibr | |
| ML20090E170 | 21 August 1974 | AO 74-10:on 740817,during Routine Surveillance Testing, Barton Differential Pressure Instrument 1 B05C (Emergency Cooling High Flow) Tripped at Lower than Required Value. Caused by Setpoint Drift | |
| ML20090E173 | 1 July 1974 | AO 74-9:on 740628,during Restart,Reactor Protection Sys Relay RE-230 Failed.Caused by Open Relay Coil.Relay Replaced | |
| ML20090E175 | 3 June 1974 | AO 50-220/74-8:on 740531,setpoint on Barton Instruments Used in Drywell High Pressure Reactor Protection Sys Drifted Higher than Required.Barton Switch Recalibr | |
| ML20090E177 | 3 May 1974 | AO 50-220/74-7:on 740425,eddy Current Testing Evaluation Showed Two Control Rod Blades W/Possible Inverted Tubes. Caused by Mfg Deficiency.Two Control Blades Will Be Changed | Shutdown Margin |
| ML20090E179 | 29 April 1974 | AO 50-220/74-6:during Releak Testing,Msiv Leaked Excessively.Cause Unknown & Being Investigated.Valve Will Be Inspected | |
| ML20090E180 | 24 April 1974 | AO 74-5:on 740415,during Annual Refueling Shutdown Testing, Three High Temp Main Steam Line Tunnel Sensors Found to Actuate at Lower than Required Temp.Caused by Setpoint Drift on Sensor.Sensors Recalibr | |
| ML20090E183 | 11 April 1974 | AO 50-220/74-4:on 740402,during Refueling Outage Test,Low Condenser Vacuum Sensors Actuated Low Resulting in Reactor Scram.Caused by Switch Setpoint Drift.Sensor Switch Recalibr | |
| ML20090E184 | 9 April 1974 | AO 50-220/74-3:on 740402,both Inside MSIVs Failed to Meet Required Limit of 12.9 Std Cubic Ft Per Inch.Caused by Drift in Position Switch on Valve Controller.Valves Will Be Repaired & Retested | |
| ML20090E187 | 2 April 1974 | AO 50-220/74-3:on 740402,during Leak Testing,Both Inside MSIVs Exceeded Leakage Limit.Caused by Either Drifting Position Switch or Improper Seating of Disc.Investigation Continuing.Position Switch Will Be Readjusted | |
| ML20090E194 | 1 April 1974 | AO 50-220/74-2:on 740323,concentrator Steam Seeped Through Insulation Surrounding 12-inch Section of Pipe Leading from Side Arm Heater to Concentrator Bottom.Caused by Improper Installation.Pipe Will Be Replaced | |
| ML20090E205 | 25 March 1974 | AO 50-220/74-2:on 740323,during Routine Concentrator Steam Operation,Pipe Crack Found in Waste Concentrator Piping Leading from Side Arm Heater.Caused by Improper Installation.Pipe Section Will Be Replaced | |
| ML20090E215 | 8 March 1974 | AO 50-220/74-1:on 740225,during Routine Surveillance Testing,Core Spray Differential Pressure Instrument (Barton 288-4802,RV-30A) Actuated Low.Caused by Setpoint Drift. Instrument Will Be Modified | |
| ML20126F604 | 4 March 1974 | AO 50-220/74-1:on 740225,core Spray Differential Pressure Instrument RV-30A Found to Actuate Lower than Specified. Caused by Setpoint Drift.Barton Switch to Be Modified to Eliminate Drift | |
| ML20090E231 | 10 December 1973 | AO 73-12-1:on 731201,Magnetrol Switch 352624 in Scram Dump Vol Level Sys Failed.Caused by Oxidized Mercury in Switch Bulb.Bulb Replaced | |
| ML20090E235 | 4 December 1973 | AO 73-12-1:on 731201,during Surveillance Test,Magnetrol Switch 352624 in Scram Dump Vol Level Sys Failed to Operate. Caused by Oxidized Mercury in Bulb of Switch.Mercury Bulb Replaced | |
| ML20090E293 | 3 December 1973 | AO 73-11-29:on 731126,15 Control Rod Drives Failed to Insert to Position 00 Following Reactor Scram.Caused by Leakage Past Stop Piston Seals | |
| ML20090E305 | 30 November 1973 | AO 73-11-12:during Review of Spring 1973 Refueling Outage Tech Spec Update,Discrepancy Noted in Pressure Setpoint Trip of Recirculation Pumps.Caused by Design Error.Design Will Be Changed | |
| ML20090E313 | 28 November 1973 | AO 73-11-20:on 731120,during Routine startup,11 Control Rod Drives Failed to Insert to Position 00 Following High Flux Scram.Caused by Damaged Stop Piston Seals Resulting in Excessive Leakage.Control Rods Will Be Overhauled | |
| ML20083Q811 | 28 November 1973 | AO 73-11-17:on 731117,during Maint Work,Facility Experienced Loss of Offsite Power.Caused by Electrician Bumping 50FDS/SI Seal in Relay.Electricians Cautioned | |
| ML20083Q806 | 21 November 1973 | AO 73-11-17:on 731117,relay 945 de-energized,tripping Only 115-kV Line,Thus Leaving Plant W/O Offsite Power.Caused by Electrician Accidentally Bumping Relay.Power Restored in 10 | |
| ML20083Q818 | 19 November 1973 | AO 73-11-10:on 731110,reactor low-low Water Level Switch Setting Found to Actuate Above Normal Setpoint.Caused by Setpoint Drift.Switch Recalibr | |
| ML20083Q815 | 16 November 1973 | AO 73-11-13:on 731113,one Reserve Power Transformer Removed from Svc.Caused by Ground in Wire Supplying Duct Heater Across One Phase of Secondary Transformer.Wire Removed & Transformer Returned to Svc | |
| ML20083Q822 | 13 November 1973 | AO 73-11-10:on 731110,reactor low-low Water Level Switch Setting Actuated Above Normal Setpoint.Caused by Setpoint Drift on Yarway RE02D Sensor.Sensor Recalibr |