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| Issue date | Title | Topic | |
|---|---|---|---|
| ML20083R663 | 19 February 1974 | AO 4-2-8:on 740215,during Reactor Coolant Temp Channel Test, Limiting Safety Sys Setting Read Below Required Tech Spec for Channels II & Iv.Cause Under Investigation | |
| ML20083R687 | 19 February 1974 | AO 4-2-7:on 740201,both Doors of Personnel Air Lock to Containment Bldg Opened at Same Time.Caused by Erroneous Operation of Hand Wheel Door Lock by Offsite Employee Which Triggered Failure of Interlock.Interlock Inspected | |
| ML20083R710 | 8 February 1974 | AO 4-2-6:on 740125,control Rods Did Not Withdraw from Core to Insertion Limit in Conformance W/Tech Specs.Boron Added to Coolant Sys & Procedures re-emphasized to Personnel | Shutdown Margin |
| ML20083R696 | 6 February 1974 | AO 4-2-7:on 740201,both Doors of Containment Air Lock Opened at Same Period of Time.Caused by Offsite Employee Mistakenly Operating Wrong Hand Wheel Opening Inner Air Lock Door | |
| ML20083R729 | 5 February 1974 | AO 4-2-5:on 740123,coolant Sys Pressure Transient Experienced During Reactor Coolant Start.Caused by Insufficient Amount of Nitrogen Added to Pressurizer. Nitrogen Procedure Changed | |
| ML20083R761 | 4 February 1974 | AO 4-2-4:on 740121,small Leak Observed at Base of Fillet Weld Attaching Pipe Nozzle to Orifice Flange for Flow Transmitter 946D.Dye Penetrant Insp Indicated Pipe Also Cracked.Faulty Weld Ground Out & Flange Socket Redressed | |
| ML20083R896 | 1 February 1974 | AO 4-2-3:insp Determined Snubber on Component Cooling Water Return Line & Snubber on Secondary Blowdown Line Defective. Cause Under Investigation.Snubbers Replaced | |
| ML20083R718 | 31 January 1974 | AO 4-2-6:on 740125,reactor Brought Critical W/Control Rods Below Required Insertion Limit.Cause Under Investigation | Shutdown Margin |
| ML20083R740 | 28 January 1974 | AO 4-2-5:on 740123,while Placing Reactor Coolant Pump in Svc,Coolant Sys Pressure Exceeded Tech Spec Limit.Probably Caused by Insufficient Nitrogen Vol | |
| ML20084A014 | 25 January 1974 | AO 4-2-2:limiting Safety Sys Settings of Channels I & III Discovered Below Tech Spec Requirement.Cause of Setpoint Drift Problem Under Investigation | |
| ML20083R768 | 21 January 1974 | AO 4-2-4:on 740121,small Leak Observed in Upstream Orifice Flange Connection for Flow Transmitter 946D in Return Line to Reactor Coolant Loop.Dye Penetrant Insp of Weld Will Be Made | |
| ML20083R915 | 21 January 1974 | AO 4-2-3:insp Completed on 740118 Revealed Accumulator Oil Level Plunger of Two Snubbers Below Criteria Mark.Cause of Failure Will Be Determined During Insp of Disassembled Defective Snubbers.Snubbers Replaced | |
| ML20084A048 | 18 January 1974 | AO 4-2-1:low Steam Line Pressure Bistables Found Below Required Limit of 600 Psig.Cause of Setpoint Drift Under Investigation.Bistable Recalibr | |
| ML20084A026 | 15 January 1974 | AO 4-2-2:limiting Safety Sys Settings of Channels I & III Found Below Tech Spec Requirement.Cause of Setpoint Drift Under Investigation | |
| ML20084A141 | 8 January 1974 | AO 4-2-1:low Steam Line Pressure Bistables Found Below Required Limit of 600 Psig.Cause of Setpoint Drift Under Investigation.Bistable Recalibr | |
| ML20084A194 | 4 January 1974 | AO 3-2-18:on 731219,analysis of Monthly Pressurizer Pressure Tests Indicated Low Setting for One Bistable.Bistable Recalibr & Sensitivity of Bistable Setpoints Under Investigation | |
| ML20084A232 | 28 December 1973 | AO 3-2-17:on 731217,one Bistable Setting Exceeded Tech Spec Limit of 92%.Cause of Setpoint Drift Under Investigation. Channel Recalibr | |
| ML20084A207 | 21 December 1973 | AO 3-2-18:on 731219,analysis of Monthly Pressurizer Pressure Tests Indicated Low Setting for One Bistable.Channel Recalibr & Detailed Rept Re Instrument Drift Underway | |
| ML20084A252 | 18 December 1973 | AO 3-2-17:on 731217,one Bistable Setting Exceeded Tech Spec Limit of 92% Span.Caused by Instrument Drift.Channel Recalibr & Investigation Initiated for Detailed Analysis of Instrument Capabilities | |
| ML20084A296 | 3 December 1973 | AO 3-2-16:on 731116,setting for One Bistable Associated W/ Low Pressurizer Pressure Safety Injection Did Not Reach Tech Spec Limit.Cause Not Yet Determined.Channel Recalibr | |
| ML20084A311 | 19 November 1973 | AO 3-2-16:on 731116,during Cold Shutdown,Setting for One Bistable Did Not Reach Tech Spec Requirement.Channel Recalibr | |
| ML20084A335 | 12 November 1973 | AO 3-2-15:during 731026 Insp,Leaks Observed at Socket Weld Branch Connections for Vents S-47 & S-51.Caused by Fatigue Failure of Pipe to Socket Welds.Metallurgical Exam Initiated,Vent Valve Assemblies Replaced & RCS Inspected | Hydrostatic |
| ML20084A381 | 1 November 1973 | AO 3-2-14:on 731017,prior to Maint on Pressurizer Safety Valves,Lift Pressure Settings Exceeded Tech Spec Limit. Valves Disassembled,Inspected & Seat Surfaces Repaired | |
| ML20084A348 | 31 October 1973 | AO 3-2-15:during 731030 Insp,Leaks Observed at Socket Weld Branch Connections for Vents S-47 & S-51.Cause & Corrective Actions Will Be Provided Upon Completion of Exam | |
| ML20084A438 | 26 October 1973 | AO 3-2-13:on 731011,reactor Tripped Off Line Due to Loss of Generator Field Relay Action.Caused by Gaseous & Particulate Radioactivity in Auxiliary Bldg.Investigation Concluded That No Release to Atmosphere Occurred | |
| ML20084A386 | 19 October 1973 | AO 3-2-14:on 731017,set Pressure of Safety Valves Exceeded Tech Spec Limit.Valves Will Be Disassembled,Inspected & Seating Surfaces Repaired | |
| ML20084A411 | 12 October 1973 | AO 3-2-13:on 731011,reactor Tripped Off Line Due to Loss of Generator Field Relay Action.Caused by Gaseous & Particulate Radioactivity in Auxiliary Bldg.Samples Analyzed & Investigation Initiated | |
| ML20084A390 | 27 September 1973 | AO 3-2-12:on 730913,during Maint of Closure Mechanism of 80-ft Elevation Outer Door of Vapor Container,Inner Door Partially Opened for Short Period.Cause Unknown.Procedures Revised & Supplemented to Prevent Recurrence | Shutdown Margin |
| ML20084A444 | 6 September 1973 | AO 3-2-11:on 730822,discovered That Instrument Setting of One of Four Channels of Low Steam Line Pressure Controllers in High Steam Flow Safety Circuit Below Tech Spec Requirements.Caused by Instrument Drift.Channel Recalibr | |
| ML20084A467 | 23 August 1973 | AO 3-2-11:on 730822,instrument Setting for One Channel of Low Steam Line Pressure Controllers in High Steam Flow Safety Circuit Found Below Tech Spec Requirements.Caused by Instrument Drift.Channel Recalibr & Satisfactorily Tested | |
| ML20084A496 | 16 August 1973 | AO 3-2-10:on 730802,discovered That Limiting Safety Sys Setting of Channel III of overpower-overtemp delta-T Reactor Trip Circuitry Below Tech Spec Requirements.Caused by Improper Adjustment of Channel.Channel Recalibr | |
| ML20084A969 | 3 July 1973 | Telecopy AO 3-2-9:on 730702,first Stage Turbine Pressure Setting Discovered Slightly in Excess of Tech Spec Limits. Cause Unknown.Investigation Underway | |
| ML20084B026 | 11 June 1973 | AO 3-2-7:on 730601,one of Two Motor Actuators for MOV 851A Improperly Moved to Closed Position Following Initiation of Automatic Safety Injection as Result of Spurious Signal from High Steam Line Flow Logic.Caused by Logic Malfunction | |
| ML20084A983 | 8 June 1973 | Telecopy AO 3-2-8:on 730607,during Performance of Periodic Tests & Calibr Checks Re Reactor Coolant Flow,Flow Trip Settings Discovered Slightly Below Tech Spec Requirements. Cause Unknown.Investigation Underway | |
| ML20084B039 | 1 June 1973 | Telecopy AO 3-2-7:on 730601,during Power Level Testing, Spurious Safety Injection Signal Initiated Automatically Starting High Head Pumps.One of Two Valves Tying Discharges Driven to Closed Position.Cause Unknown | |
| ML20084A992 | 29 May 1973 | AO 3-2-6:on 730519,within Minutes After Starting High Head Safety Injection Pump 23,accumulator Level Observed Not Changing & Pump Discharge Pressure Decreased to Existing Rcs.Caused by Personnel Error | |
| ML20084B013 | 25 May 1973 | AO 3-2-5:on 730518,pressure Transient within RCS Experienced Due to Closure of Certain Air Operated Valves in Reactor Coolant Letdown Sys.Caused by Moisture Freezing in Air Supply Line Refrigerant Dryer of Instrument Air Sys | Hydrostatic |
| ML20084B098 | 14 May 1973 | Ao:On 730511,during Pressurization,Preparatory to Starting Reactor Coolant Pumps for Performance of Hydrostatic Leak Test of Rcs,Leak Apparently Occured in Valve 204B Located in Loop 21 Charging Line.Caused by Defect in Stud Holes | Hydrostatic |
| ML20084B110 | 4 May 1973 | Ao:On 730426,MSIV 22 Failed to Close in Response to Manual Signal by Control Room Operator.Caused by Binding of Linkage Connecting Solenoid Armature to Valve.Solenoids Thoroughly Cleaned of All Lubricant |