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| Issue date | Title | Topic | |
|---|---|---|---|
| ML20211M649 | 8 October 1997 | Addenda 1 to Part 21 Rept Re Weldments on Opposed Piston & Coltec-Pielstick Emergency stand-by Diesel gen-set lube-oil & Jacket Water Piping Sys.Revised List of Potentially Affected Utils to Include Asterisked Utils,Submitted | |
| ML20056E975 | 19 August 1993 | Provides Insp Results & Safety Analysis Re Operational Amplifiers Discussed in 920917 & 23 Ltrs as Potential Safety Issue.Concludes That There Are No Safety Concerns W/Respect to Buffer Amplier Module.Ltr Not 10CFR21 Notification | |
| ML20044G531 | 26 May 1993 | Suppl to 921207 Part 21 Rept Re Declutch Sys Anomaly in Certain Types of Valve Actuators Supplied by Limitorque Corp.Limitorque Designed New Declutch Lever Which Will Be Available in First Quarter 1993 | Stroke time |
| ML20126J596 | 31 December 1992 | Part 21 Rept Re Potential Loss of RHR Cooling During Nozzle Dam Removal.Nozzle Dams May Create Trapped Air Column Behind Cold Leg Nozzle Dam.Mod to Nozzle Dams Currently Underway. Ltrs to Affected Utils Encl | Hydrostatic |
| ML20125C716 | 7 December 1992 | Part 21 Rept Re Possibility for Malfunction of Declutching Mechanisms in SMB/SB-000 & SMB/SB/SBD-00 Actuators. Malfunction Only Occurs During Seismic Event.Balanced Levers May Be Purchased from Vendor.List of Affected Utils Encl | Stroke time Anchor Darling |
| ML20127P586 | 23 November 1992 | Followup to 921005 Part 21 Rept Re Potential Defect in SB/SBD-1 Housing Cover Screws.Procedure Re Replacement of SBD-1 Spring Cover Bolts Encl.All Fasteners Should Be Loosened & Removed.List of Affected Utils Encl | |
| ML20118B219 | 23 September 1992 | Suppl to Part 21 Rept Re Potential Deviation in Some Bailey Controls Co 88 Series Modules,Transmitted Via .One Module Found Incapable of Reaching 100% Output at Max Rated Load.Recommends That Circuit Board Assemblies Be Inspected | |
| ML20090L880 | 18 March 1992 | Part 21 Re Cracked Piston Castings Received from Acme Foundry,Fairbanks Morse & General Casting.Magnetic Particle Insp of All Pistons Will Be Performed.List of Affected Plants Encl | |
| ML17262A262 | 30 November 1990 | Part 21 Rept Re Chilled Water Sys.Initially Reported on 901030.Evaluation of Perry Plant Will Be Sent by 901230 | |
| ML20012C105 | 7 March 1990 | Part 21 Rept Re Several Failures of Fairbanks Morse Engine Div Piston Pins/Bushings on Upper Pistons.Caused by Incorrect Surface Pattern on Piston Pins.Piston Pins Under Listed Purchase Orders to Be Removed & Replaced | |
| ML20205F321 | 10 October 1988 | Part 21 Rept Re Potential Deviation from Tech Spec Concerning Ry Indicators Due to Operating Temp Effect on Analog Meter Movement.Initially Reported on 881006.Customers Verbally Notified on 881006-07 | |
| ML20245D954 | 6 September 1988 | Part 21 Rept Re Condition Involving Inconel 600 Matl Used to Fabricate Steam Generator Tube Plugs & Found to Possess Microstructure Susceptible to Stress Corrosion Cracking | |
| ML20203D022 | 14 July 1986 | Part 21 Rept Re Air Monitoring Sys Probes Exhibiting Blue Tip Rather than Normal White Tip & Insensitive to Chlorine. Caused by Improper Handling/Storage.Advisory Bulletin Encl. Item Not Reportable Per Part 21 | |
| NRC-86-3142, Part 21 Rept Re Increased Failure Probability of Coils Used in Class 1E Motor Starters & Contactors Supplied to Nuclear Power Plants by Westinghouse.Replacement Coils Mfg for All Starters & Contactors on Encl List | 19 June 1986 | Part 21 Rept Re Increased Failure Probability of Coils Used in Class 1E Motor Starters & Contactors Supplied to Nuclear Power Plants by Westinghouse.Replacement Coils Mfg for All Starters & Contactors on Encl List | |
| ML20134Q174 | 29 August 1985 | Part 21 Rept Re Potential Maint Issues Associated w/Anker-Holth Snubbers.Owners of Anker-Holth Snubbers Will Be Informed of Problems & Sent Revs to Technical Instruction Manuals to Include Procedures for Seal & Fluid Maint | |
| ML20210G992 | 13 August 1985 | Part 21 Rept Re Failure of Isolated Worm Shaft Gear When Certain Critical Speeds Combined W/Repetitive Transfer of Actuator Clutch Mechanism from Manual (Handwheel) to Motor Drive Mode.Two Possible Solutions Noted | |
| ML20126C690 | 5 June 1985 | Part 21 Rept Re Generator Failure.Concurs W/Encl Louis Allis That Interpolar Connectors Be Removed | |
| ML20129G440 | 29 May 1985 | Part 21 Rept Re Failure of Inner Polar Connector Between Damper Bar Circuit on Generator Main Field.Cause of Failure Not Defined.Further Investigation Necessary | |
| ML20010G682 | 16 September 1981 | Part 21 Rept Re Heating, Ventilation & Air Conditioning Ductwork.New Design Info Shows Ducts Could Collapse If Subjected to High Negative Pressure Due to Dirty Filters. Stiffener Angles Will Be Added | |
| ML20010C688 | 6 August 1981 | Interim Deficiency Rept Re Potentially Reportable Diesel Generator Starting Air Sys Design,Initially Reported 810803. Generator Supplier Will Be Contacted to Determine Whether Deficiency Exists.Problem Suspected to Be Generic in Nature | Safe Shutdown |
| ML20002D562 | 13 January 1981 | Interim Deficiency Rept Re Electrical Component Cabinets Where Frame Is Welded to Embedded Steel Angles,Initially Reported 810109.Concrete Failure & Loss of Positive Anchorage Possible.Review Will Be Completed by 810306 | Safe Shutdown |
| ML17266A359 | 31 October 1980 | Final Deficiency Rept Originally Reported on 800325 Re Defective Hydramotor Actuators for Dampers & Louvers.Caused by Mfg from Incorrect Matl.Dampers Reworked & Retested. Dampers & Louvers to Be Tested in Preoperational Program | |
| ML20085A483 | 13 December 1979 | Part 21 Rept Re Visual Linear Defects in ASME III Class 2 Core Flooding Sys Isolation Valve & Unacceptable Indications in Six ASME III Class 1 Decay Heat Sys Isolation Valves at Wppss.Cause Will Be Investigated | |
| ML20090F401 | 11 October 1977 | Part 21 Rept Re Defective Auxiliary Feed Pump Governor. Initially Reported on 770930.Governor Modified at Woodward Governor Co Facilities | |
| ML19319C895 | 3 October 1974 | Deficiency Rept Re Internals Handling Fixture Spherical Nut Retaining Device Potential to Become Unthreaded.Caused by Design Error.Capture Device Redesigned & Hole Drilled in Threaded Rod to Ensure Capture by Set Screw | |
| ML19262A309 | 26 April 1974 | Deficiency Rept Re 3/4 Inch Carbon Steel Nut Discovered on Top of Lower Grid Assembly at Interface of Core Positions L-2 & M-3.Found During post-hot Functional Insp of Reactor Internals.Addl Insps & Investigations in Progress | |
| ML19270H516 | 11 April 1974 | Deficiency Rept Re Buckling Inward of Upper Section of Sodium Thiosulfate Tank While Filling Tank.Caused by Negative Internal Pressures.Procedure for Establishing Geometry of Buckled Tank Plate Being Developed | |
| ML19270H515 | 4 April 1974 | Deficiency Rept Re Failure of Diesel Generators to Operate When Given Start Signal During Engineered Safeguards Surveillance Tests.Applicable Procedures Being Revised & Review Conducted of Safeguards Test Requirements | |
| ML19210B221 | 29 March 1974 | Ro:On 740329,nuclear Svc River Water Pump Failed During Hot Functional Test Sequence.Caused by Pump Shaft Fracture in Pump Motor Shaft Coupling Area.Motor & Pump Returned to Respective Vendors for Insp & Repair | |
| ML19262A380 | 15 March 1974 | Deficiency Rept Re Diaphragm Sucked Over Suction Screen Which Cut Off Flow During Draining of Condensate Storage Tank 1B.Condenser Vacuum Collapsed Suction Screen Which Punctured Diaphragm.New Screen Designed | |
| ML19290A495 | 7 March 1974 | Deficiency Rept Re Failure of 1B HPI Pump.Caused by Damage to Seal Rings of Two Stages of Pump & Personnel Errors. Repairs to Pump Completed Per Work Request Revision of Administrative Procedure 1012 | |
| ML19210B348 | 1 March 1974 | Deficiency Rept Re Lack of Separation of Seven Circuits in Vicinity of Heating,Ventilation & Air Conditioning Panel Underneath Control Room Discovered During Jan 1974 Audit by General Public Utils Svc Corp | |
| ML19290A483 | 22 February 1974 | Final Deficiency Rept Re Revision of Specific Heat Curve for U Oxide Fuel as Utilized in Transient Computer Codes for Plant Safety Analyses.Forwards New Specific Heat Code & LOCA Limited Max Allowable Linear Heat Rate Graphs | |
| ML19290A482 | 19 February 1974 | Final Deficiency Rept Re Discrepancies Between Physical Cable Count & Cable Tray Loading Summary Quantities.Forwards Table W/Summary & Resolution of Audit Findings.Revised Pull Slips Issued for Circuits CG-415 & RV-844 | |
| ML19276H355 | 4 February 1974 | Notifies That Reactor Bldg Spray Pump Motors Do Not Meet Design Criteria.Motors Not Able to Reach Normal Operating Speed within Six Seconds Under Worst Undervoltage Condition. No Corrective Action Will Be Taken | |
| ML19210B269 | 20 December 1973 | Deficiency Rept Re Bent Vent Valve Thermocouple Guide Tubes & Bent Thermocouple Nozzles on Reactor Vessel Closure Head. Caused by Misalignment of Nozzles on Head to Guide Tubes on Plenum.Corrected by Partial Removal of Nozzles | |
| ML19210B257 | 12 December 1973 | Deficiency Rept Re Discrepancies Between Physical Cable Count & Cable Tray Loading Summary Quantities.Seven of 20 Safeguard Cable Trays Randomly Selected Did Not Agree W/ Summary.Caused by Revised Pull Clips W/Routing Change | |
| ML19210B383 | 4 December 1973 | Deficiency Rept Re Partial Draining of RCS from 150 Inches to Near 0 Inches Pressurizer Level(Approx 40000 Gallons). Caused by Personnel Error.Operator Closed DH-V6A Valve. Plant Shut Down W/No Testing in Progress | |
| ML19290A488 | 9 November 1973 | Deficiency Rept Re Failure of Nuclear Svc River Water Pump 1B Motor.Caused by Length of Rope Tangled in Pump.No Immediate Corrective Action Required.Motor Sent to Vendor for Insp & Repair | |
| ML19290A477 | 4 October 1973 | Deficiency Rept Re Discovery of Limitorque Valve Operators DH-V-6A & BS-V-3B on Floor Removed from Respective Valves & Partially Wetted During 730831 de-energizing of Power to Perform Electrical Changes to TMI-1 Sys | |
| ML19210B392 | 21 September 1973 | Deficiency Rept Re Arc Suppression Diode Failure in Westinghouse Model DB-25 & DB-50 Breakers During Checkout. Caused by Exposure of Diodes to Voltage Spikes in Excess of Breakdown Voltage,Causing Diodes to Short Out | |
| ML19250C100 | 18 September 1973 | Deficiency Rept Re Failure of Stems on Core Flood Valves CF-V-1A & CF-V-1B Equipped W/Limitorque SMB-4 Operators. Diameter of Stem Caused Thread to Be Tapered.Stem Nut Would Bind & Prevent Further Opening by Hand Operation | |
| ML19290A498 | 20 August 1973 | Deficiency Rept Re Seismic I Hanging Conduit Lacking Appropriately Approved Detail Per Recent Audit.Addl Info Required for Approval Not Sent.Criteria & Drawings Will Be Prepared to Prevent Further Occurrences | |
| ML19290A472 | 20 August 1973 | Deficiency Rept:On 730515 Nuclear Svc River Water Pump 1C Motor Caught Fire & Supply Breaker Tripped During Operation Supporting Testing of Circulating Water Sys.On 730717 Knocking Noise & Burning Odor Emanated from Pump | |
| ML19290A473 | 17 August 1973 | Deficiency Rept Re Grease Leakage Discovered on 730720 from 2090P Casing Filler Mfg by Viscosity Oil Co Into Vertical Tendon Conduits.Liner Plate Checked & No Bulging or Buckling Found.Samples of Leaking Matl Taken | |
| ML19290A463 | 6 August 1973 | Deficiency Rept Re Apparent Breakdown in QA Program Including Insp & Testing of Protective Electrical Equipment & Circuitry.Qc Surveillance of Multi-Amp Engineering Svcs Reinstituted & Notification Procedures Begun | |
| ML19290A455 | 12 July 1973 | Final Deficiency Rept Re Completion of Valve Wall Thickness Verification Program.Wall Thickness of Valves Adequate. Records of Measurements & Evaluations Available at Site | |
| ML19290A443 | 4 June 1973 | Final Deficiency Rept Re Scratches Observed on 730514 at Eight Locations Around Top Outer Surface of Reactor Vessel Internal Thermal Shield After Removal of Lower Core Support Assembly Shipping Container | |
| ML19290A427 | 8 December 1972 | Deficiency Rept Re Anomalous Conditions in Seven Shop Welds During Pre Baseline Inservice Insp.All Are B&W Shop Welds. Submits Findings of B&W Nov 1972 Ultrasonic Testing of Specified Welds.Plans Further Exploratory Testing |