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| Issue date | Title | Topic | |
|---|---|---|---|
| ML20073R436 | 23 August 1974 | AO BFAO-50-260/746W:on 740813,HPCI Valve FCV 73-44 Failed to Open & RCIC Failed to Show Speed Indication When Turbine Manually Initiated During Surveillance Testing After Valve Failure.Valve Failure Cause Unknown | |
| ML20084H399 | 30 August 1974 | AO BFAO-50-260/749W:on 740820,during Routine Surveillance Testing,Valves FCV 64-28G & FCV 64-28L Position Indication Lights Observed Not to Operate as Required.Caused by Minor Corrosive Buildup on Operating Plunger on Green Light | |
| ML20084H408 | 6 September 1974 | AOs BFAO-50-260/747W & BFAO-50-260/7410W:on 740814 & 21, FCV 1-52 & Fvc 1-27 Outboard Containment Isolation Valves in Steamlines B & D,Respectively,Failed to Open When Manually Actuated.Caused by Foreign Particles | |
| ML20084H418 | 23 August 1974 | AO BFAO-50-259/7444W:on 740813,during Surveillance Testing, Recirculation Jet Pump Riser Differential Pressure Switch PDIS-68-17 Found to Operate Outside Tech Spec Setpoint Limit.Caused by Switch Contact Malfunction | |
| ML20084H422 | 14 August 1974 | Telecopy AO BFAO-50-259/7444T:on 740813,during Routine Surveillance Testing,Recirculation Jet Pump Riser Differential Pressure Switch PDIS-68-17 Found to Operate Outside Tech Spec Limits | |
| ML20084H433 | 13 August 1974 | Telecopy AO BFAO-50-260/746T:on 740813,two HPCI Valve Operators Failed During Routine Startup & RCIC Failed to Reach Rated Flow During Subsequent Required Surveillance Testing.Orderly Shutdown & Pressure Reduction Progressing | |
| ML20084H438 | 21 August 1974 | AO BFAO-50-260/745W:on 740811,HPCI Exhaust Line Rupture Disc Failed.No Cause or Other Info Stated | |
| ML20084H446 | 20 August 1974 | AO BFAO-50-260/744W:on 740810,HPCI Isolated Due to Excessive Steam Flow During Manual Start of Hpci.Caused by Spurious Spiking of Pdis Switches Monitoring HPCI Steamflow.Snubbers Added to Instrument Lines & 3 Delay Relays Added | Safe Shutdown |
| ML20084H450 | 19 August 1974 | AO BFAO-50-260/743W:on 740809,RHR Pump Discharge Pressure Switch PS-74-19A Found Inoperable During Routine Surveillance Testing.Caused by Disorientation of Actuator Arm for Switch Contacts.Arm Became Wedged | |
| ML20084H453 | 16 August 1974 | AO BFAO-50-260/742W:on 740808,PdIS-71-1A Observed Indicating Downscale During RCIC Testing.Caused by Reversal of Sensing Lines on PdIS-71-1A.Sensing Lines Reversed on Local Instrument Panel | |
| ML20084H456 | 9 August 1974 | Telecopy AO BFAO-50-260/742T:on 740808,review of Startup Test Data Disclosed PDIS-71-1A RCIC High Steam Flow Isolation Switch Inoperable.Redundant PDIS71-1B Tested & Found Inoperable | |
| ML20084H470 | 9 August 1974 | AO BFAO-50-260/741W:on 740730,11 of 14 Seismic Restraints Supporting Yarway Water Columns on Reactor Pressure Vessel Found Inoperable.Caused by Failure to Lubricate Restraints During Factory Assembly.New Restraints Installed | |
| ML20084H472 | 23 August 1974 | AOs BFAO-50-260/747W & BFAO-50-260/741OW:on 740814 & 21, Valves FCV 1-52 & FCV 1-27 to Steamlines D & B,Respectively, Failed to Open.Other MSIVs Tested & Appear Fully Operational | |
| ML20084H482 | 26 July 1974 | AO BFAO-7443W:on 740717,MAPLHGR Calculated to Be Above Tech Spec Limits After Completion of Full Set of TIPs | |
| ML20084H496 | 1 July 1974 | AO BFAO-7442W:on 740621,reactor Scrammed by Low Condenser Vacuum Due to Steam Jet Air Ejector Malfunction.Hpci Sys Failed to Initiate Manually.Caused by Foreign Particles in Oil Sys Contributing to Pilot Valve Seating Failure | |
| ML20084H499 | 22 June 1974 | Telecopy AO BFAO-7442T:on 740621,addl Attempt to Start HPCI Manually Unsuccessful Following Reactor Trip.Hpci Started on Third Attempt | |
| ML20084H501 | 27 June 1974 | AO BFAO-7441W:on 740618,during Performance of Surveillance Instruction on Core Spray Sys Loop II Logic,Pumps 1B & 1D Failed to Start.Caused by Bent Contact Arm on Relay.Arm Repaired & Checked for Adequate Wipe | |
| ML20084H504 | 18 June 1974 | Telecopy AO BFAO-7441T:on 740618,core Spray Sys Logic Relay 14A-K23B Found to Be Inoperable.Cause Not Stated.Relay Repaired Immediately & Retested Satisfactorily | |
| ML20084H507 | 21 June 1974 | AO BFAO-7440W:on 740614 Radwaste Bldg Vent Monitoring Channel Was Out of Svc for More than 1 H W/O Temporary Monitor.Caused by Failure to Turn on High Voltage on Vent Monitoring Channel Constant Air Monitor After Maint | |
| ML20084H512 | 14 June 1974 | Telecopy AO BFAO-7440T:on 740614,radwaste Bldg Exhaust Continuous Air Monitor Out of Svc for 1.5 H.No Cause Stated. Bldg Surveys Indicate No Unusual Release | |
| ML20084H517 | 19 June 1974 | Telecopy AO BFAO-7439W:on 740609,several Manual Starts Attempted Before HPCI Turbine Started.Caused by Failure of Turbine Stop Valve to Open,Possibly Due to Low Operating Oil Pressure or Improperly Working Oil Relay Valve | |
| ML20084H521 | 11 June 1974 | AO BFAO-7439T:on 740609,difficulty Experienced in Manually Starting HPCI Started After Several Attempts.Hpci Was Not Called Upon for Automatic Start | |
| ML20084H527 | 14 June 1974 | AO BFAO-7438W:on 740606,main Steamline B Outboard Isolation Valve FCV 1-27 Closed Too Fast.Caused by Low Fluid Level in Dashpot Cylinder Due to Hydraulic Fluid Leaking Past Lower Seals on Valve Dashpot Cylinder | |
| ML20084H531 | 7 June 1974 | Telecopy AO BFAO-7438T:on 740606,during Startup Test,Main Steam Line B Outboard Oscillation Valve FCV-1-27 Closed Too Fast.No Cause Stated | |
| ML20084H568 | 12 June 1974 | AO BFAO-7437W:on 740602,switch 2 Failed to Operate at Tech Spec Setting of Greater than or Equal to 378 Inches Above Vessel Zero During Surveillance Testing.No Cause Stated. Switch Readjusted.Testing Frequency to Be Once Every 2 Wks | Reactor Vessel Water Level |
| ML20084H574 | 4 June 1974 | Telecopy AO BFAO-7437T:on 740602,reactor Water Level Switch LIS-3-58B Switch 2 Found to Operate Outside Tech Spec Setpoint During Surveillance Testing | |
| ML20084H577 | 3 June 1974 | Telecopy AO BFAO-7437T:on 740602,reactor Water Level Switch LIS-3-58B,switch 2,found to Operate Outside Tech Spec Setpoint of 378 Inches Above Vessel | |
| ML20084H583 | 7 June 1974 | AO BFAO-7436W:on 740528,spill of 12,000 Gallons of Potentially Contaminated Water Occurred to Unit 3 Condensate Backwash Receiver Tank Room.Caused by Failure of Procedures to Specify Closing 1-HCV-2-747 Valve After Maint | |
| ML20084H592 | 29 May 1974 | Telecopy AO BFAO-7436T:on 740528,80,000 Gallons of Condensate Water from Unit 1 Storage Tank Drained Into Pipe Tunnel & Subsequently Into Unit 3 Area.Water Pumped Back Into Unit 2 Sumps | |
| ML20084H619 | 5 June 1974 | AO BFAO-7435W:on 740526,HPCI Isolated on High Steam Flow & HPCI Inboard Containment Isolation Valve FCV 73-2 Could Not Be Reopened.Cause Unknown.Valve Operator & Motor Replaced & Valve Returned to Svc After Functional Testing | |
| ML20084H628 | 27 May 1974 | Telecopy AO BFAO-7435T:on 740526,HPCI Isolated on High Steam Flow & Subsequent Attempts to Open Inner HPCI Steam Line Containment Isolation Valve Unsuccessful | |
| ML20084H661 | 30 May 1974 | AO BFAO-7434W:on 740521,HPCI Pump Discharge Valve FCV 73-44 Discovered Inoperable During Investigation of Ground on 250-volt Dc Sys.Caused by Motor Failure.Motor Replaced,Valve Tested & Returned to Svc | |
| ML20084H666 | 22 May 1974 | Telecopy AO BFAO-7434T:on 740521,HPCI Injection Valve FCV-73-44 Discovered Inoperable Due to Burned Out Motor. Caused by 250-volt Dc Ground to Valve | |
| ML20084H674 | 30 May 1974 | AO BFAO-7433W:on 740521,FCO 64-44 Refueling Zone to Standby Gas Treatment Sys Crosstie Damper Failed to Open During Surveillance Test.Caused by Failure of Fsv 64-44 Pilot Solenoid Valve to Operate Due to Grease on Core Pole Face | |
| ML20084H684 | 22 May 1974 | Telecopy AO BFAO-7433T:on 740521,damper FCV-64-44 Failed to Open During Surveillance Test.Damper Is Refueling Zone Exhaust to Standby Gas Treatment Crosstie Damper | |
| ML20084H689 | 29 May 1974 | AO BFAO-7420W:on 740519,plant Exceeded ETS Limit of 5 F River Temp Increase.Caused by Natural Difference in Water Temp Between Upstream & Downstream Monitors at 5-foot Depth, Due to Conditions Other than Plant Operations | |
| ML20084H716 | 24 May 1974 | AO BFAO-7432W:between 740408 & 0514,Unit 2 Turbine Roof Exhaust Not Monitored for Gaseous Release Activity When Exhaust Fans Operated.Caused by Incorrect Assembly of Two Continuous Air Monitors So Sample Bypassed Monitors | Time of Discovery |
| ML20084H720 | 15 May 1974 | Telecopy AO BFAO-7432T:turbine Bldg Exhaust Fans Operated Approx 16 Days W/O Continuous Air Monitoring.Caused by Vendor Assembly Error So Air Sample Bypassed All Radiation Detectors | |
| ML20084H728 | 24 May 1974 | AO BFAO-7431W:on 740514,15 Pipe Hangers on Torus Spray Header Found Failed,Allowing Header to Drop & Rest on Several Drywell Vents.Caused by Deficient Design of Hanger Assembly.Larger Hangers Installed | |
| ML20084H740 | 15 May 1974 | Telecopy AO BFAO-7431T:on 740514,torus Spray Header Type Hangers Discovered Disconnected During Torus Entry | |
| ML20084H746 | 23 May 1974 | AO BFAO-7430W:on 740513,reactor Bldg Closed Cooling Water Backup Cooling Water Supply Valve FCV 67-50 Failed to Open. Caused by Plugged Strainer in Water Supply Line.Strainer Changed & Mod Approved | |
| ML20084H751 | 14 May 1974 | Telecopy AO BFAO-7430T:on 740513,supply Valve FCV-67-50 to Reactor Bldg Closed Cooling Water Found Inoperable.Valve Operator Strainers Cleaned & Valve Tested Satisfactorily | |
| ML20084H757 | 23 May 1974 | AO BFAO-7429W:on 740513,RHR Isolation Shutdown Cooling Suction Isolation Valve FCV 74-47 & Shutdown Cooling Head Spray Isolation Valve FCV 74-77 Isolated RHR Shutdown Cooling Mode & Tripped Pumps.Caused by Disconnected Spring | |
| ML20084H762 | 14 May 1974 | Telecopy AO BFAO-7429T:on 740513,spring Found Disconnected on Armature of Isolation Relay 10AK-98B.No Cause Stated. Relay Repaired & Satisfactorily Tested | |
| ML20084H765 | 22 May 1974 | AO BFAO-7428W:on 740512,torus Spray Valve FCV 74-58 Tripped Out Electrically When Attempt Made to Operate Valve.Caused by Broken Yoke Due to Insufficient Amount of Weld or Overstress of Weld | |
| ML20084H771 | 13 May 1974 | Telecopy AO BFAO-7428W:on 740512,broken Yoke Found on FCV-74-58 Loop 1 Torus Spray Valve.Investigation Into Cause Continues | |
| ML20084H786 | 17 May 1974 | AO BFAO-7427W:on 740507,computer Identification Check Revealed Use of Hancock 1-inch 600-psig Forged Stainless Steel Globe Valves in Sys Whose Design Conditions Exceed Vendor pressure-temp Ratings for Valves | |
| ML20084H791 | 7 May 1974 | Telecopy AO BFAO-7427T:plant Designer Advised That Number of 1-inch Stainless Steel 600-psig Instrument Valves Wrongly Applied on Plants.Investigation Underway | |
| ML20084H796 | 15 May 1974 | AO BFAO-7426W:on 740505 & 06,Target Rock Main Steam Relief Valve PCV 1-19 Experienced Extended Blowdown.Caused by Leaking Pilot Seat & Burr on Second Stage Stem Insert Guide Sleeve Acting Together | |
| ML20084H805 | 7 May 1974 | Telecopy AO-BFAO-7426T:on 740505 & 06,safety Relief Valve Slow to Recede Following Reactor Trip & Isolation.Plant Shutdown in Progress.Investigation Continues |