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| Issue date | Title | Topic | |
|---|---|---|---|
| ML20042E643 | 18 April 1990 | Special Rept:On 900305,east Cable Vault Exhaust Damper VS-D-180 Failed to Close During Trip Testing of Fire Dampers Under Air Flow Conditions.Caused by Inadequate Spring Closure Mechanism.Springs Replaced W/Helical Coil Springs | |
| ML19324C294 | 8 November 1989 | Special Rept:On 891026,inservice Insp of Tubing in Steam Generators Completed.Degradation Mechanisms of Steam Generator Tubing Falls In,Cold Leg Support Plate Thinning & Hot Leg Support Plate Damage | Boric Acid |
| ML18041A190 | 24 April 1989 | Special Rept:On 890414,triaxial Time History Accelerometer Horizontal Trigger Circuits Identified as Inoperable. Caused by Incorrect Calibr Procedure.Surveillance Procedure Immediately Revised to Reflect Correct Setpoint Values | |
| ML20042B449 | 15 March 1982 | ROs 82-007/01P & 82-008/01P:during Update of Analysis Required by IE Bulletin 79-14,overstress Condition Found on a Steam Generator Steamline.Condition Analyzed in FSAR & Addressed Through Emergency Procedures | |
| ML20004F740 | 8 June 1981 | RO 81-047/01P:on 810606,during Normal Plant Tour,Primary Auxiliary Bldg Operator Found High Head Safety Injection Pump Emergency Cooling Water Supply Valve Unlocked & Closed. New Chain & Lock Installed | |
| ML20004C481 | 29 May 1981 | Ro:On 810527-29,during Routine Review of Surveillance Records,Discovered That Sample of Gaseous Waste Discharge Path Not Taken on 810528 as Required When Radiation Monitor Was Out of Svc.Required Samples Taken on 810527-29 | |
| ML20049A587 | 4 May 1981 | RO 81-32/01P:on 810502,feedwater Vibrations on a Steam Generator Feed Line Damaged Snubbers,Shims & Shim Retainer of Vertical Energy Constraint.Cause Under Investigation. Steam Release Calculations Will Be Refined | |
| ML19350C741 | 26 March 1981 | RO 81-029:on 810312,discrepancy Noted Between Plant Mod Manual & Tech Specs During Review of Inservice Insp Requirements for Mods Recently Completed on 0.75 & 1-inch Branch Connection on RCS & Safety Injection Sys | Hydrostatic |
| ML19345B800 | 24 November 1980 | RO 80-086/01P:on 801121,Tech Specs 6.9.1.8.i Analysis of Structures Has Less Conservatism than Originally Calculated. Overstress Condition Exists on Seal Injection Header from Discharge of High Head Safety Injection Pumps | |
| ML20049A335 | 17 November 1980 | RO 80-078/01P:on 801114 It Was Discovered That Code Safety Valves Challenged W/Water Loop Seal on Inlets Would Result in Overstress of Pressurizer Safety & Power Operated Relief Valve Piping.Drainage of Seals Would Prevent Condition | Loop seal |
| ML19347B673 | 8 October 1980 | RO:80-075/01P:on 801008,analysis Revealed Overstress Condition Existed at Pipe Support H-43 on Reactor Coolant Fill Header from High Head Charging Pumps.Cause Not Determined.Mod Will Be Completed Prior to Plant Startup | Design basis earthquake |
| ML19338E844 | 29 September 1980 | RO 80-071/01P:on 800926,during Surveillance Test to Verify Equipment Operating Times,Control Room Isolation Times Determined Not in Accordance W/Tech Specs.Caused by Tech Spec Error in Specified Response Time | |
| ML19338F129 | 29 September 1980 | RO 80-071/01P-0:on 800925,during Surveillance Test to Verify Equipment Operating Times,Control Room Isolation Times Determined Contrary to Tech Spec.Caused by Tech Spec Error in Required Time Determination | |
| ML19338F026 | 26 September 1980 | Ro:On 800925,diesel-driven Fire Pump Auto Started.Caused by Hole in Section of Pipe from Back Hoe Operator Digging Up Portion of Fire Main Yard Loop.Leak Isolated & Backup Water Made Available.Pipe Section Repaired | |
| ML19347A853 | 23 September 1980 | RO 80-070/01P:on 800922,born Dilution Discovered During RCS Initial Fill & Vent,Causing Unplanned Reactivity Insertion to Exceed Tech Specs Limits.Caused by Procedural Deficiency.Boric Acid Blender Total Flow Setpoint Changed | Boric Acid Shutdown Margin |
| ML19347B101 | 22 September 1980 | RO 80-069/01P-0:on 800920,motor Driven Fire Pump Began Smoking & Leaking Oil After Surveillance Test.Investigation Showed Cooling Water Lost from Upper Bearing Cooler.Cause Undetermined.Temporary back-up Pumps Available | |
| ML19338D119 | 15 September 1980 | Ro:Evaluation & Analysis Required by IE Bulletin 79-14 Revealed Piping & Supports Have Less Conservatism During Seismic Events.Mods Will Be Made Prior to Startup | Design basis earthquake Earthquake |
| ML19344F534 | 8 September 1980 | Ro:Evaluation & Reanalysis Required by IE Bulletin 79-14 Revealed That Certain Piping & Supports Have Less Conservatism than Assumed for Safety Analysis.Cause Unstated.Pipe Support Will Be Added Prior to Startup | |
| ML19330B424 | 28 July 1980 | RO 80-052/01P:on 800726,diesel Fire Pump auto-started Below Rated RPM & Pressure.No Specific Cause Found.Fuel Oil Filter Changed & Pump Tested Successfully | |
| ML19318D073 | 30 June 1980 | RO 80-044/01T:design for Steam Generator Snubber Embedment Found Not to Reflect as-constructed Condition, Resulting in Nonconservative Loads for Anchors.Caused by Assumption That Load Was Applied to Normal Surface | |
| ML19318B336 | 20 June 1980 | RO 80-037/01T:during Review of Radiographs of Reactor Containment Liner Seam Welds,Portion of One Weld Is Code Rejectable.Authenticity of Other Seam Weld Radiographs Questionable.Investigation Continuing | |
| ML19323H672 | 9 June 1980 | Ro:On 800529,meteorological Instrumentatiion Computer Channels Found Not Responding Properly to Automatic Calibr Signals.Caused by Output Resistors Not Being Removed During 800515 Move.Resistors Removed & Sys Calibr Verified | Met Tower |
| ML19323F150 | 21 May 1980 | RO 80-031/01T:on 800521,while Energizing RHR motor-operated Isolation Valves,Suction Valve Closed.Caused by False High Pressure Signal Input Due to de-energized Instrument Loop. RHR Pump Shut Down.Sys Isolated for Repairs | |
| ML19323F154 | 20 May 1980 | RO-80-030/01T:on 800519,during Test of Diesel Driven Fire Pump High Temp Alarm Occured.Cause Unknown.Temporary Fire Pump Hooked Up.Investigation Underway | |
| ML19309E782 | 16 April 1980 | RO 80-025/01T:during Tank Mod Project,Field Engineers Reported That Weld on 12-inch Nozzle Penetrations to Refueling Water Storage Tank Does Not Conform W/Manufacturer Design.Addl Penetrations Are Being Checked | |
| ML19323A096 | 11 April 1980 | RO 80-023/01T:during Operational Mode 5,w/steam Generators & RCS Level at mid-span in Loops,Complete Loss of RHR Flow Occurred While Plant Operators Were Increasing Heat Exchanger Flow.Procedure Rewritten | |
| ML19305D285 | 8 April 1980 | RO 80-22/01T:on 800407,during Operational Mode 5,complete Loss of RHR Flow Occurred During Attempt to Increase Flow. Operating Procedure Changed to Require Venting RHR During Flow Increase | |
| ML19309D751 | 3 April 1980 | Ro:On 800225,two Frequencies on Peak Shock Annunciator Sys Actuated Visual Alarms.Cause Unknown.Problem w/70% (OBE) Visual Alarms May Have Been Caused by Reed Switches or Alarm Circuitry.Investigation Is Continuing | Earthquake |
| ML19305A971 | 12 March 1980 | RO 80-12/01T:on 800312,during Operations Audit,Tech Spec Surveillance 4.3.3.5 Found to Be Violated.Required Channel Check Not Performed Since Jul 1976.Requirement Deleted Due to Meter Reading of Zero During Normal Operation | |
| ML19344D307 | 5 March 1980 | Ro:On 800226,fire Pump Removed from Svc Due to Suspicion of Water in Pump Oil.Cause Unstated.Oil Cooler Checked & Hydroed Satisfactorily.Motor Bearing Will Be Replaced & Returned to Svc | |
| ML19296D165 | 25 February 1980 | RO 80-08/01T:on 800225,during Cable Tray & Conduit as-built Configuration Review,Preliminary Framing Beam Analysis Indicated Potential Floor Beam Overstress.Caused by Conduit & Tray Support Horizontal Acceleration | Earthquake |
| ML19305A764 | 22 February 1980 | RO 80-7/01P:on 800221,condition Found Resulting in No Supplementary Leak Collection & Release Flow Through Main Filter Banks During Fuel Movement.Caused by Procedure Inadequacy.Procedures Revised | |
| ML19257C637 | 24 January 1980 | RO-80-3/01P:on 800124,analysis Showed That,During Postulated Seismic Event,Pipe Support H-95 on Component Cooling Water Sys Line CC-323 Would Receive Overstress.Support H-95 Will Be Altered to 3-way Restraint | |
| ML19291C267 | 17 January 1980 | LER 80-02/01T:on 800117,while in Operational Mode 5,received Indication of Low Residual Heat Removal Sys Flow When Low Flow Alarm Was Annunciated & Low Pump Amps Noted.Caused by Steam Generator Burp.Air Eductor Installed | |
| ML19291C257 | 11 January 1980 | Suppl to 790718 RO Re Fire Main Sys Rupture.Problem at Facility Not Considered Generic.Piping Was Probably Struck Sharp Blow During Const or Installation of Nearby Conduit Which Contributed to Failure | |
| ML19210E405 | 28 November 1979 | RO 79-46/01P:on 791127 Flowpath to Charging Pumps Closed Due to Planned Removal of Emergency Diesel Generator.High Head Injection Would Have Not Been Available If Needed.Error Corrected When Valve Opened to Increase Flow Path to Pumps | |
| ML19254F923 | 13 November 1979 | LER 79-47/01P:on 791110,review of Plant Operator Logs & History of Containment Vacuum Pumps Suggested Air Leak Into Containment.Caused by Particulate Monitor Leak.Leak Repaired.Monitor Returned to Svc | Grab sample |
| ML19210C114 | 5 November 1979 | RO 79-49/01P:on 791105,during Routine Review of Operations, Samples of Containment Atmosphere Gaseous Monitor Could Not Be Taken.Activity Levels Could Still Be Monitored.Addl Info in Followup Rept | |
| ML19256A147 | 27 October 1978 | RO 78-053/01P:on 781026 During Review of Stresscalculations for Safety Injection Piping Inside Containment,Errors in Piping Stress Analysis Were Discovered.Caused by Error in Hand Calculating Method |