Semantic search
Jump to navigation
Jump to search
| Issue date | Title | Topic | |
|---|---|---|---|
| ML20084A511 | 15 August 1975 | AO 75-13:on 750815,approx 12,000 Gallons of Refueling Water Storage Tank Water Ran Into Sump B Causing Containment Basement Floor to Be Flooded & Sump a to Flood.Caused by Personnel Error | |
| ML20084A725 | 25 July 1975 | AO 75-12:on 750725,during Monthly Surveillance Procedure PT-9,undervoltage & Underfrequency Protection,Primary Undervoltage Device 273/11B Armature Did Not Drop Down to Assume de-energized Position.Caused by Scale Accumulation | |
| ML20084A811 | 11 April 1975 | AO 75-09:on 750410,control Rod Cap K-7 Inspected Due to Leak Indication & Pinhole Leak Discovered.Cap to Be Replaced | |
| ML20084A830 | 9 April 1975 | AP 75-08:on 750326,post-accident Charcoal Filter Sys a & B Tested for Filter Efficiency.Filter Bank a Tested Efficiency at 99.4% for Molecular Iodine Removal | |
| ML20084A851 | 24 March 1975 | AO 75-07:eddy Current Testing Program Indicated That 10 a & 12 B Steam Generator Hot Leg Tubes Had Wall Thinning of 50% or Greater.Cause Not Stated | |
| ML20084A879 | 26 February 1975 | AO 50-244/75-5:on 750218,safety Injection Pump 1C Failed to Start Manually from Bus 16.Cause Not Stated.Safety Injection Pump 1C Will Be Started Weekly Until 1975 Refueling Shutdown Scheduled for 750315 | |
| ML20084A888 | 18 February 1975 | AO 75-05:on 750218,safety Injection Pump 1C Failed to Start from Bus 16 When Manually Activated.Cause Not Stated.Pump Will Be Started Once/Wk from Bus 16 Until PORC Changes Testing Frequency | |
| ML20084A903 | 21 February 1975 | AO 50-244/75-04:on 750213,during Performance of PT-20,MSIV Solenoid Trip Test,One Air Supply Solenoid Valve Failed to Operate When Tested.Caused by Flat Spot or Burr on Latching Pin.Linkage Adjusted | |
| ML20084A914 | 13 February 1975 | AO 75-04:on 750213,during Performance of PT-20 MSIV Solenoid Trip Test,One Air Supply Solenoid Valve on MSIV 1H Failed to Operate When Tested.Cause Not Stated.Linkage Adjusted.Test to Be Repeated Before 750315 Outage | |
| ML20084A925 | 14 February 1975 | AOs 50-244/75-02 & 50-244/75-03:on 750205 & 06,safety Injection Pump 1C Failed to Start Manually from Bus 16. Caused by Spring Being Slightly Depressed.Westinghouse to Be Notified | |
| ML20084A941 | 5 February 1975 | AO 75-02:while Conducting PT-2.1 & Following Satisfactory Test of Safety Injection Pumps 1A & B,Safety Injection Pump 1C Failed to Start Manually on Bus 16.Pumps Started from Bus 14.Thorough Insp of Breaker Recommended | |
| ML20084A952 | 6 February 1975 | AO 75-03:while Conducting Retest of Safety Injection Pump 1C on Bus 16,pump Failed to Start Manually First Time.Holding Coil of Lockout Relay & Breaker to Have Thorough Insp | |
| ML20084B009 | 17 January 1975 | AO 50-244/75-1:on 750108,turbine Governor Valve & Associated Trip & Throttle Valve Tripped to Closed Position Approx 15 After Steam Supply Quick Start Valves Opened.Caused by Degraded Lube Oil Supply Pressure Due to Instrument Drift | |
| ML20084B021 | 9 January 1975 | AO 75-1:on 750108,steam Driven Auxiliary Feedwater Pump Tripped Out After Running for Approx 15 S.Low Lube Oil Pressure Trip Setpoint Adjusted | |
| ML20084E084 | 20 December 1974 | AO 50-244/74-21:on 741211,boric Acid Tank Level Channel LC 171 Dropped to Zero Level Indication.Caused by Failure of LC 171 Power Supply Module.Module Replaced | Boric Acid |
| ML20084E089 | 11 December 1974 | AO 50-244/74-21:on 741211,boric Acid Tank Level Transmitter LT-171 Dropped to Zero Level Indication.Cause Not Stated | Boric Acid |
| ML20084E096 | 18 December 1974 | AO 50-244/74-20:on 741209,deficiency Found in Monthly Surveillance Test Procedure PT-16 Re Auxiliary Feedwater Flow.Caused by Incorrect Ref Pressure Value.Test Procedure PT-16 Revised Based on New Data from Flow Balance | |
| ML20084E099 | 10 December 1974 | AO 50-244/74-20:on 741209,deficiency Discovered in PT-16 Flow Check Procedure of Auxiliary Feedwater Pump.Procedure Revised | |
| ML20084E103 | 13 December 1974 | AO 50-244/74-19:on 741204,during Surveillance Test PT-9, Undervoltage Relay 274/11B Failed to Operate.Caused by Scale Accumulation on Armature Plunger Opposite Upper Guide Bearing.Plunger Polished | |
| ML20084E111 | 5 December 1974 | AO 50-244/74-19:on 741204,during Monthly Surveillance Test PT-9,undervoltage Relay 274/11B Failed.Caused by Scale Accumulation on Armature Plunger Opposite Upper Guide Bearing.Plunger Polished | |
| ML20084E120 | 12 November 1974 | AO 50-244/74-18:on 741111,excessive Leakage Rate Indicated from Containment Side Purge Exhaust Valve.Caused by Crimp in Rubber Valve Seat.Crimp Smoothed Out | |
| ML20084E129 | 4 October 1974 | AO 50-244/74-17:on 740925,discrepancies Found in Level Alarm Setpoints on Accumulations.Caused by Erroneous Calculations Supplied by Westinghouse.Tech Spec Change Request Filed | |
| ML20084E134 | 26 September 1974 | AO 50-244/74-17:on 740925,possible Discrepancy Found in Vol of Borated Water in Accumulators.Cause Under Investigation. Correct Vol to Be Established When Final Accurate Figures Available | |
| ML20084E138 | 30 September 1974 | AO 50-244/74-16:on 740918,results of Water Sample Analysis Showed Boron Concentration in a Accumulator Below Tech Spec Limit.Caused by Leakage of Primary Coolant Into B Loop Accumulator.Closer Surveillance of Accumulator Maintained | |
| ML20084E142 | 19 September 1974 | AO 50-244/74-16:on 740918,results of Water Sample Analysis Showed Boron Concentration in a Accumulator Below Tech Spec Limit.Recommendations Made for Closer Surveillance of Boron Concentration in Accumulators | |
| ML20084E145 | 23 August 1974 | AO 50-244/74-15:on 740815,steam Generator a Blowdown Isolation Valve Was Only Closing 80%.Caused by Piece of Carbon Steel Resting on Top of Valve Seat Ring.Valve Stem & Plug Assembly Replaced | |
| ML20084E149 | 16 August 1974 | AO 50-244/74-15:on 740815,1A Steam Generator Blowdown Isolation Valve Failed to Close Properly.Further Insp of Valve Operator Recommended | |
| ML20084E152 | 15 August 1974 | AO 50-244/74-14:on 740807,safety Injection Pump 1C Failed to Start Manually on Bus 16.Cause Not Determined.Westinghouse Specialist to Examine Breaker.Possible Replacement of Lockout & Tripper Bar Assembly Recommended | |
| ML20084E158 | 7 August 1974 | AO 50-244/74-14:on 740807,safety Injection Pump 1C Failed to Start Manually on Bus 16.Thorough Insp Recommended | |
| ML20084E166 | 16 July 1974 | AO 50-244/74-13:on 740702,leak Discovered in Socket Weld of 3/4-inch Vent Pipe to Weldolet on Charging Pump Discharge Filter Bypass Line.Caused by Improper Weldolet Surface Preparation.New Valve & Nipple Installation Recommended | Safe Shutdown |
| ML20084E169 | 3 July 1974 | AO 50-244/74-13:on 740702,leak Found in Weld Connecting 3/4-inch Vent Valve Nipple to Weldolet on Charging Pump Filter Bypass Line.Repairs During Cold Shutdown Recommended | |
| ML20084E174 | 16 July 1974 | AO 50-244/74-12:on 740629,leak Discovered in Socket Weld of 3/4-inch Vent Pipe to Vent Valve on Charging Pump Discharge Filter Bypass Line.Caused by Corrosion Mechanism.New Valve Installation Recommended | |
| ML20084E180 | 2 July 1974 | AO 50-244/74-12:on 740629,leak Found in Weld Connecting 3/4-inch Vent Valve to Nipple on Charging Pump Discharge Filter.Valve Replaced | |
| ML20084E186 | 8 July 1974 | AO 50-244/74-11:on 740626,main Steam Line Isolation Valve a Failed to Close.Caused by Excessive Heat to Coils & Plungers.Plungers Adjusted | |
| ML20084E192 | 26 June 1974 | AO 50-244/74-11:on 740626,main Steam Line Isolation Valve a Failed to Close.Valves Adjusted | |
| ML20084E195 | 21 June 1974 | AO 50-244/74-10:on 740613,valve 991,outlet from Primary Sys Flow Indicator FI-903 to Channel Drain Tank Reported Open. Caused by Improperly Verified Valve Alignment.Valve 991 Locked Closed | |
| ML20084E199 | 14 June 1974 | AO 50-244/74-10:on 740613,valve 991 of Sample Sys Flow Indicator FI-903 Found Open & Chemical Tank Overflowing. Valve Closed & Tank Pumped Down to Normal Level | |
| ML20084E206 | 10 June 1974 | AO 50-244/74-09:on 740530,during Surveillance Test, Underfrequency Relay 811/11A Found Inoperable.Cause Undetermined.Testing Frequency of Relays Increased | |
| ML20084E208 | 30 May 1974 | AO 50-244/74-09:on 740530,during Surveillance Test PT-9, One Underfrequency Relay on Bus 11A Failed to Transmit Signal of Simulated Fault Condition.Relay Replaced | |
| ML20084E214 | 21 May 1974 | AO 50-244/74-08:on 740511,increase in Gas Radiation Level of Auxiliary Bldg Exhaust at Vent Noticed.Caused by Dripping in General Location of a Mixed Bed Demineralizer Outlet Piping.Leak Isolated | |
| ML20084E220 | 14 May 1974 | AO 50-244/74-08:on 740511,liquid Leak in Outlet Piping from a Mixed Bed Demineralizer in Auxiliary Bldg Released Gases to Bldg Atmosphere.Leak Isolated | |
| ML20084E231 | 3 May 1974 | AO 50-244/74-07:on 740426,during Surveillance Test, Underfrequency Relay 811/11A Found Inoperable.Caused by Opening of Electrolytic Capacitor.Printed Circuit Board Replaced | |
| ML20084E239 | 26 April 1974 | AO 50-244/74-07:on 740426,during Surveillance Test PT-9,one Underfrequency Relay on 11A Bus Failed to Transmit Signal to Logic Racks When Fault Condition Simulated.Relay Replaced | |
| ML20084E243 | 2 May 1974 | AO 50-244/74-06: on 740422,RHR Pump Suction Valve 851B Failed to Open.Caused by Valve Being Too Tightly Sealed in Closed Position.Operating Procedures for Heatup Changed | |
| ML20084E250 | 23 April 1974 | AO 50-244/74-06:on 740422,RHR Valve 851B Failed to Open. Valve Manually Opened.Procedure Review Recommended | |
| ML20084E273 | 22 February 1974 | AO 50-244/74-03:on 740214,containment Purge & Exhaust Dampers Failed to Maintain Leakage Rates within Specified Levels.Caused by Paint & Dirt Debris on Disc Edges of Purge Valves.Edges Cleaned | |
| ML20084E281 | 15 February 1974 | AO 50-244/74-03:on 740214,containment Purge & Exhaust Dampers Failed to Maintain Leakage Rates within Specified Levels.Repairs to Dampers Will Be Completed | |
| ML20084E293 | 19 February 1974 | Ao:On 740101,abnormal Degradation Discovered in Steam Generator a Tubes Designed to Contain Radioactive Matls Resulting from Fission Process.Cause Undetermined.Tube Sheets Cleaned Using High Pressure Water Lance Method | |
| ML20084E297 | 7 February 1974 | AO 50-244/74-02:on 740101,eddy Current Test Results Indicated Wastage Problem Localized in Steam Generator a Hot Leg in Ctr Area of Tube Sheet.After Results of Tests Analyzed,Tube Plugging Will Be Initiated | |
| ML20084E309 | 28 January 1974 | AO 50-244/74-01:on 740118,during Removal of Insert from Steam Generator a Hot Leg Section,Inrush of Air to Generator Occurred Causing Unbalance of Pressure on Water Still in Tubes | Shutdown Margin |