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| Issue date | Title | Topic | |
|---|---|---|---|
| ML20086D317 | 2 September 1975 | AO 75-018:on 750901,steam Supply Valve 13-15 Failed to Close When Control Switch Placed in Closed Position.After Repeated Attempts,Valve 13-15 Responded & Cycled Closed.Valve Stroked,Timed to Ensure Operability & Declared Inoperable | |
| ML20086D367 | 25 July 1975 | Telecopy AO 75-014:on 750725,head Gasket on Gland Seal Exhaust Condenser Failed.Replacement of Failed Gasket Initiated Immediately.Condenser Repaired & HPCI Sys Tested & Verified Operable | |
| ML20085E955 | 9 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 | |
| ML20086D375 | 8 July 1975 | Telecopy AO 75-013:on 750707,injection Valve CS-11B Failed to Open When Control Switch Placed in Open Position.Valve Immediately Opened Manually to Full Open Position.Sys Aligned to Normal Standby Mode | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| ML20084U950 | 2 January 1975 | AO 50-265/74-29:on 741223,cracks at Welds in 4 Inch Reactor Recirculation Discharge Valve Bypass Lines Indicated.Cause Undetermined.Piping on a & B Loops to Be Completely Replaced | |
| ML20084U956 | 23 December 1974 | Telecopy Ao:Three Weld Abnormalities Discovered on Welds in Bypass Piping Lines Around Recirculation Pump Discharge Valves.Plans Formulated to Replace Lines | |
| 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 | |
| ML20086E400 | 16 December 1974 | AO 74-16:on 741214,containment Air Sampling Sys Found Inoperable.Caused by Nonfunctioning Heat Tracing Circuit.Sys Repaired | |
| 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 | |
| ML20086J391 | 14 October 1974 | AO 74-11:on 741004,RCIC Steam Line Drain Valve Failed to Close.Caused by Piece of Weld Slag Wedged in Below Seat Stem Guide.Valve Disassembled & Cleaned | |
| ML20086J395 | 4 October 1974 | Telecopy AO 74-11:on 741004,RCIC Steam Line Drain Valve Failed to Close.Caused by Weld Bead.Rcic Sys Blocked to Permit Disassmbly of Valve & Investigation of Problem | |
| ML20086J403 | 4 October 1974 | Telecopy AO 74-50:on 741004,cleanup Sys Dc Isolation Valve V-16-14 Failed to Close Electrically.Cause Under Investigation.Arc Horn on Contactor 2Bc Replaced | |
| ML20086J425 | 4 October 1974 | Telecopy AO 74-15:on 741004,setpoint Drift Detected on Ps 263-52A,PS 263-53A & Ps 263-53B.Caused by Setpoint Drift. Switches Recalibr | |
| ML20084C557 | 4 October 1974 | AO 50-219/74-48:on 740925,isolation Condensers a & B Inoperable Due to High Flow as Sensed by Condensate Line Break Sensors.Caused by Tripping of Line Break Sensors Due to Effects of Rated Recirculation Flow | |
| ML20084C580 | 30 September 1974 | Preliminary AO 50-219/74-48:on 740927,main Steam Line Low Pressure Switch RE23A Found to Trip at Pressure Less than Min of 860 Psig.Caused by Switch Repeatability.Ge Submitted Info to Reduce Setpoint | Fuel cladding |
| ML20084C786 | 26 August 1974 | Preliminary AO 50-219/74/45:on 740824,commitment to Follow MAPLHGR Limits Violated.Caused by Insufficient Guidance. Reactor Power Reduced by Recirculation Flow to Point Where No MAPLHGR Limits Violated | |
| 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 | |
| ML20086E460 | 3 July 1974 | AO 74-09:in 740625,movements of LPCI Loop Break Detection Logic Differential Pressure Indicating Switches 2-129B & 2-129C Found Sticking,Causing Pointer to Log Input Pressure. Caused by Frequent Switch Actuation | |
| ML20086E437 | 27 June 1974 | AO 74-10:on 740626,HPCI Inverter Tripped,Rendering HPCI Sys Inoperable.Cause Not Stated.Inverter Replaced | |
| ML20086E473 | 26 June 1974 | AO 74-09:on 740625,movements of LPCI Loop Break Detection Logic Differential Pressure Indicating Switches 2-129B & 2-129C Sluggish,Causing Pointer to Lag Input Pressure.Switch 2-129B Replaced & 2-129C Placed in Trip Condition | |
| ML20086E500 | 13 June 1974 | AO 74-08:on 740525,water Discovered in Ventilation Ducting & in Instrument Penetrations at Biological Shield.Caused by Leak on Control Rod Drive Hydraulic Sys Return Line to Reactor Vessel,Due to Stress Corrosion Cracking | Hydrostatic Liquid penetrant |
| ML20086E576 | 4 June 1974 | AO 74-08:detailed Rept & Analysis Including Appropriate Corrective Measures Taken Re 740526 Incident Will Be Submitted within 20 Days of Occurrence | |
| ML20086E583 | 28 May 1974 | AO 74-08:on 740525,water Leakage Discovered Along Reactor Vessel Wall.Caused by Leak on Control Rod Drive Hydraulic Sys Return Line to Reactor Vessel.Engineering Review & Assessment Underway | |
| ML20086E636 | 15 May 1974 | AO 74-07:on 740509,spike Observed on Plant Stack Gas Recorder,Resulting in Stack Release Peak Greater than Allowed by Tech Specs.Caused by Steam Packing Exhauster Operation | |
| ML20086E639 | 10 May 1974 | AO 74-07:on 740509,spike Observed on Plant Stack Gas Recorder,Resulting in Stack Release Peak Greater than Allowed by Tech Specs.Cause Not Stated | |
| ML20086K995 | 8 May 1974 | Telecopy AO 74-24:on 740507,RCIC Outboard Steam Isolation Valve MO-13-16 Failed to Open Following Surveillance Test. Caused by Failed Motor.Outboard & Operable Inboard RCIC Steam Isolation Valves Placed in Closed Position | |
| ML20086E652 | 25 April 1974 | AO 74-06:on 740418,both Access Doors to North Entrance to Reactor Bldg Found Partially Open.Caused by Personnel Failing to Verify Closure.Design Adequacy Under Review | |
| ML20086E664 | 19 April 1974 | AO 74-06:on 740418,both Access Doors to North Entrance to Reactor Bldg Found Open.Caused by Personnel Failure to Verify Closure.Methods to Assure Closure Underway | |
| ML20084D239 | 12 April 1974 | Preliminary AO 50-219/74/26:on 740412,emergency Svc Water Pump 52C Failed to Start.Cause Under Investigation | |
| ML20086E677 | 11 March 1974 | AO 74-05:on 740304,LPCI Loop a Valve V10-25A Failed to Open When Control Switch Placed in Open Position.Caused by Burned Out Valve Motor.Motor Replaced | |
| ML20086E696 | 5 March 1974 | AO 74-05:on 740304,LPCI Valve V10-25A Failed to Open When Control Switch Placed in Open Position.Caused by Tripped Motor Breaker & Unusually Warm Motor.Motor Replaced | |
| ML20086E713 | 1 March 1974 | AO 74-04:on 740223,MSIV Rv 2-71B Failed to Open at Required Setpoint.Indirectly Caused by Approved vendor-recommended Mods to Certain Relief Valve Internals.Procedure Revised | |
| ML20086E724 | 25 February 1974 | AO 74-04:on 740223,MSIV Rv 2-71B Failed to Open at Required Setpoint.Cause Under Investigation | |
| ML20086E732 | 11 February 1974 | AO 74-03:on 740204,LPCI Differential Pressure Indicating Switch 2-137B Failed to Indicate Properly Upon Isolation from Normal Sys Pressure W/Bypass Valve Open.Caused by Improper Sensor over-range Stop Setting.Sensors Calibr | Overtravel |
| ML20086E754 | 7 February 1974 | AO 74-02:on 740131,core Spray Sys Valve CS-11A Failed to Open When Control Switch Placed in Open Position.Caused by burned-out Valve Motor.Motor Replaced | |
| ML20086E747 | 4 February 1974 | AO 74-03:on 740204,LPCI Differential Pressure Indicating Switch 2-137B Failed to Indicate Properly Upon Isolation from Normal Sys Pressure W/Bypass Valve Open.Cause Not Stated.Sensor Replaced | |
| ML20086E763 | 1 February 1974 | AO 74-02:on 740131,core Spray Sys Valve CS-11A Failed to Open When Control Switch Placed in Open Position.Cause Not Stated.Surveillance Testing Completed & Sys Aligned to Standby Mode | |
| ML20086E782 | 31 January 1974 | AO 74-01:on 740124,reactor Scrammed,Resulting from Turbine Trip Causing Automatic Closure of All But One Msiv.Valve 2-80C Failed to Close Due to Failure of Pneumatic Pilot Valve to Actuate.Valve Assembly Returned to Vendor for Insp |