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| Issue date | Title | Topic | |
|---|---|---|---|
| LD-97-031, Part 21 Rept Re Incorrect Nut & Washer Plate Matl for ECCS Suction Strainer Bolted Connections.Nut Plates & Washer Plates Fabricated from Incorrect Matl & Delivered to Peach Bottom Unit 3 Site.Nut & Washer Plates Never Installed | 30 October 1997 | Part 21 Rept Re Incorrect Nut & Washer Plate Matl for ECCS Suction Strainer Bolted Connections.Nut Plates & Washer Plates Fabricated from Incorrect Matl & Delivered to Peach Bottom Unit 3 Site.Nut & Washer Plates Never Installed | |
| 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 | |
| ML20211H791 | 30 September 1997 | Part 21 Rept Re Failure of Weldment Associated w/lube-oil Piping Sys on 970804 at Millstone,Unit 2.Root Cause Is Not Yet Known.Quality of Weldment Is Being Considered.Listed Util Sites Affected | |
| ML20140A476 | 27 May 1997 | Provides Addl Info to 970429 Part 21 Rept Re Potential safety-related Problem W/Asco HV 266000-007J Scram Solenoid Pilot Valves.Corrective Actions Also Listed | |
| ML20133E800 | 8 January 1997 | Deficiency Rept Re Nonconformance Related to Masterflow 713 Grout,Which Master Builders,Inc Has Supplied as Nuclear SR Product to 18 Npps.Cause Unknown.Requests That Listed Info Be Provided to Gain Insight as to Scope & Possible Cause | |
| ML20086T176 | 19 July 1995 | Part 21 Rept Re Potential Problem W/Type 51's & 87T Relays. Potential Problem Identified as Defective Tap Block. Recommends That Users Identified on Attachment 1 Page Verify Testing Per Instruction Listed on Encl Product Advisory Ltr | |
| ML20059H772 | 17 January 1994 | Part 21 Rept Re Virginia Power Notifying Fairbands Morse Via Failure Analysis Rept NESML-Q-058 of Defective Air Start Distributor cam,16104412 | |
| ML20059F263 | 7 January 1994 | Part 21 Rept Re Air Start Distributor Cam Mfg by Fairbanks Morse.Mfg Suggests That Site Referenced in Encl App I Inspect Air Start Distributor Cam as Soon as Practical | |
| ML20058G598 | 17 November 1993 | Part 21 Rept Re Westronics Recorders,Model 2100C.Signal Input Transition Printed Circuit Board Assembly Redesigned to Improve Recorder Immunity to Electromagnetic Interference.List of Affected Recorders & Locations Encl | |
| ML20059L986 | 11 November 1993 | Part 21 Rept Re Deviation Wherein Fully Open Butterfly Valve Located 15 Pipe Diameters Upstream of Sensors Was Disturbing Flow Profile Enough to Cause Ultrasonic Meter to Indicate 3 to 4% Low.Customers Notified & Valve Removed | |
| 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 | |
| ML20116L512 | 9 October 1992 | Part 21 Rept Re safety-related RHR Pump Motor Fan Failure Due to Lack of Weld Penetration Between Fan Blades & Discs. New Duplicate GE Motors Mfg by GE Canada,Motors & Drive Dept.New Surplus Motors Have Double Fillet Welds | |
| ML20118B439 | 11 September 1992 | Part 21 Rept Re Degradation in Abb Type 27N Undervoltage Relays Used in Electrical Switchgear.Recommends That Users Review Applications Requiring Exposures Greater than 1E03 Rads TID W/Time Delay Function Option | |
| ML20096F592 | 11 May 1992 | Followup to 920417 Part 21 Rept 10CFR21-0062 Re Failed Shaft in DG W/Emd 645 Series Engines Using Turbochargers Remanufactured from May 1991 to Jan 1992.Turbochargers Should Be Removed & Returned to EMD for Insp/Repair | |
| ML20043A609 | 27 April 1990 | Part 21 Rept Re Defective Axial Cracks in Pump Shaft in Region Immediately Above Impeller & in Reactor Recirculation Pumps.Probably Caused by Crack Growth as Thermal Fatigue. Technical Advisory Bulletin Will Be Sent to Each Util | |
| ML20005G683 | 5 January 1990 | Part 21 Rept Re Installation Instructions for Grommet Use Range for Patel Conduit Seal P/N 841206.Conduit Seals in Environ Qualification Applications Inspected for Proper Wire Use Range & Grommets Replaced | |
| ML20247D301 | 12 July 1989 | Part 21 Rept 10CFR21-0047 Re Control Wiring Insulation of Inner Jacket Used on General Motors Diesel Generator Sets Identified as 999 or MP Series.Encl List of Owners of Units Notified | |
| ML20246K740 | 26 April 1989 | Part 21 Rept Re Incorrectly Stamped Name Plates on Certain Asco Nuclear Qualified Valves.Vendor Will Contact Each Affected Facility & Furnish Correctly Stamped Plates & in Near Future Discontinue Sale of Rebuild Kits for Valves | |
| ML20207N464 | 12 October 1988 | Part 21 Rept Re Potential Problem W/Emd 20-645E4,Type 999 Excitation Sys Circuit Breaker & Wiring.Potential for Field Circuit Breaker to Trip Due to Combined Air Temps & Field Current Exists at All Plants W/Model 999 Sys | |
| ML20151M737 | 29 July 1988 | Part 21 Rept Re Discovery of Cooper Contamination in 125- Volt Station Batteries.Cooper Contamination Could Result in Lowering of Cell Voltage or Negative Plate Voltage W/ Reduction in Battery Capacity | Safe Shutdown |
| ML20236F491 | 19 October 1987 | Part 21 Rept on QA Controls Re NDE Records Utilized by Eastern Testing & Insp,Inc During Performance of NDE Svcs at Facility.Names of Individuals Informing NRC & Identification of Basic Svcs Containing Defect Provided | Non-Destructive Examination Liquid penetrant |
| ML20204B362 | 19 March 1987 | Part 21 & Deficiency Rept Re Reactor Protection Sys Power Supply Circuit Breaker Deficiencies.Initially Reported on 860616.Unit 3 Mods Complete.Unit 2 Mods,To Be Completed During Spring 1987 Outage,Currently in Progress | |
| ML20211P721 | 23 February 1987 | Part 21 Rept Re Rockbestos Coaxial Cable Used in Sorrento Electronics Digital & Analog high-range Radiation Monitor. Insulation Resistance at High Temp Not High Enough for Ion Chamber & Associated Electronics to Operate Properly | |
| 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 | |
| ML20206S084 | 30 June 1986 | Part 21 Rept Re Possible Cut Wires in Wire Harness of Bbc Brown Boveri K600/K800 Circuit Breakers.Initially Reported on 860509.Safety Implications Listed.Gear Guard Designed to Prevent Cut Wires | |
| ML20211P511 | 16 June 1986 | Part 21 Rept Re Failures of Shunt Trip Coils on Westinghouse Circuit Breakers in Reactor Protection Sys.Initially Reported on 860609.Breakers Replaced,Operation Aids (Labels) Added & Equipment Modified.Related Correspondence | |
| ML20205T645 | 10 June 1986 | Part 21 Rept Re Defect in GE Type Sbm Control Switch Intended for Use in Alternate Shutdown Sys.Defective Switch Rejected & Returned to Vendor.Remaining Switches Examined. Corrective Action Rept M-36 Issued to United Controls,Inc | |
| ML20203C526 | 14 April 1986 | Part 21 Rept Re Defect in Westinghouse Circuit Breakers Type Lbb,Catalog Number LBB22250 W/Factory Installed 125-volt Dc Shunt Trip.Defect Could Result in Burning Out Shunt Trip Coil | |
| ML20141D805 | 1 April 1986 | Part 21 Rept Re Model 402 Series Level Control Used for safety-related Application Shipped W/O Torque Check. Customers Will Be Notified by 860428 & Requested to Perform Torque Check.List of Plants Using Component Encl | Earthquake |
| ML20155F238 | 13 March 1986 | Part 21 & Deficiency Rept Re Failure of Clow Corp Containment Isolation & Vacuum Relief Valves in torus-to-vacuum Breaker Lines.Bearings Being Replaced W/ Different Matl.Related Correspondence | Stroke time |
| ML20154A374 | 24 February 1986 | Part 21 Rept Re Failure of Diesel Engine E-2 Air Blower. Generator Disassembled for Removal of Aluminum Fragments & Replacement of Colt Industries,Inc Turbochargers,Roots Blower & Piston Rings | |
| ML20140A528 | 19 December 1985 | Part 21 Rept Forwarding Ltr Sent to Customers Re Check Valves Missing Lock Welds on Hinge Supports or Hinge Support Capscrews,Per 851121 Request.List of Customers Receiving Ltr Also Encl | |
| 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 | |
| ML20133N469 | 5 August 1985 | Part 21 Rept Re Raychem Wcsf Shrink Sleeving for Sensor/ Connecting Assembly of Safety Relief Valve Monitoring Sys. Testing & Retesting in Progress.Sensor Installation Utilizing Shrink Sleeving Recommended | |
| 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 | |
| ML20127N062 | 13 May 1985 | Part 21 Rept Re Incorrect Short Time Delay Band Lever Inadequately Installed in Low Voltage K-line Circuit Breaker Electromechanical Overcurrent Trip Device.Visual Insp to Determine If Correct Lever Installed Recommended | |
| ML20116N614 | 3 May 1985 | Part 21 & Deficiency Rept SSH-M-85/01 Re Defective Circuit Breakers for Recombiners Supplied by Rockwell Intl.Initially Reported on 841124.Equipment Deficiencies Corrected Prior to Installation.Rockwell Intl Requested to Follow Up Action | |
| ML20112C649 | 14 March 1985 | Part 21 & Deficiency Rept Re Inadequate Designed Clamps. Initially Reported on 850314.Spring Disc Washers Required in Clamp Design Shipped to Site,Assembly Drawings Revised to Include Spring Disc & Installation Procedure Made | |
| ML20113A429 | 11 January 1985 | Part 21 Rept Re Incorrect Insulating Tape.Instructions Governing Handling of Incoming Matls Fully Adequate & If Followed,Would Have Prevented Error | |
| ML20095G601 | 22 August 1984 | Part 21 Rept Re Defects in 18-inch SA-333 RHR Pipe.Samples of Defective Pipe Matl Being Shipped to Techninat Corp,Per Request.Defects Located in One Length of SA-333 Grade 6 Pipe | |
| ML20090H850 | 20 July 1984 | Supplemental Part 21 Rept Re Two Laminar Type Discontinuties Noted in Tioga Pipe Supply Co 18-inch Carbon Steel Pipes. Corrective Action Rept M-27 Issued to Bechtel on 840705 Requesting Identification of Cause | |
| ML20077H705 | 4 August 1983 | Part 21 Rept Re 75 Components (Part P2073A) Lacking Conformance to Specs for Size & Fusion.Initially Reported on 830718.Conditions Which Allowed Erroneous Shipment Corrected | |
| ML20072N989 | 8 July 1983 | Interim Part 21 Rept Confirming 830705 Telcon Re Anomalies in Artificially Aged Apparatus (Using Ahrrenius Methodology W/Elevated Temp Aging).Deficiency Found During Qualification Testing for IEEE 323-1974.Draft Notices Encl | |
| ML20083L975 | 27 May 1983 | Part 21 Rept Re Failure of Circuit Breakers During Environ Testing.Test Results Indicate That Temp Sensitivity Problem May Be Generic to All Ite Imperial Corp thermal-magnetic Circuit Breakers Calibr for 40 C Svc | |
| ML20069H065 | 23 March 1983 | Part 21 Rept Re Discovery of Failed Switch Operator Cam 14 within Position Selector Switch 4,operating ECCS Pump Room Cooler.Initially Reported on 830104.Caused by Cam Matl Fracturing Into Small Pieces.Jumpers Installed | |
| ML20086F069 | 15 July 1977 | Interim Deficiency Rept Re Welding Deficiencies on Embeds. Initially Reported on 770616.Caused by Improper Weld Joint Preparation.Personnel Instructed in Proper Interpretation of Welding Symbols on Design Drawings | |
| ML20086F073 | 1 July 1977 | Interim Significant Deficiency Rept 2 Re Structural Steel Defects.Initially Reported on 770111.Final Rept Will Be Submitted on 770801 Rather than 770701 |