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| Issue date | Title | Topic | |
|---|---|---|---|
| ML20217A169 | 22 September 1999 | Part 21 Rept Re Engine Sys,Inc Controllers,Manufactured Between Dec 1997 & May 1999,that May Have Questionable Soldering Workmanship.Caused by Inadequate Personnel Training.Sent Rept to All Nuclear Customers | |
| ML20153D019 | 18 September 1998 | Part 21 Rept Re Defect in Gap Conductance Analyses for co- Resident BWR Fuel.Initially Reported on 980917.Corrective Analyses Performed Demonstrating That Current Operating Limits Bounding from BOC to Cycle Exposure of 8 Gwd/Mtu | Fuel cladding |
| ML20153C677 | 17 September 1998 | Part 21 Rept Re Defect Relative to MCPR Operating Limits as Impacted by Gap Conductance of co-resident BWR Fuel at Facilities.Operating Limit for LaSalle Unit 2 & Quad Cities Unit 2 Will Be Revised as Listed | |
| ML20236N675 | 9 July 1998 | Part 21 & Deficiency Rept Re Notification of Potential Safety Hazard from Breakage of Cast Iron Suction Heads in Apkd Type Pumps.Caused by Migration of Suction Head Journal Sleeve Along Lower End of Pump Shaft.Will Inspect Pumps | |
| ML20217D028 | 22 April 1998 | Part 21 Rept Re Additive Constants Used in MCPR Determination for Siemens ATRIUM-9B Fuel by Core Monitoring Sys Were Found to Be non-conservative.SPC Personnel Notified All Customers w/ATRIUM-9B Lead Test Assemblies | Fitness for Duty |
| ML20198K508 | 6 January 1998 | Part 21 Rept Re Transient Analyses at Exposures Prior to End of Cycle.Caused by Component Defect.Notified Commonwealth Edison of Defect & Provided Revised Limits by Siemens Power Corp | |
| ML20203B369 | 10 December 1997 | Part 21 Rept Re Potential to Exceed Operating Limits.Cycle 8 Delayed Until Fall 1998 | |
| ML20198J487 | 16 October 1997 | Interim Part 21 Rept Re Transient Analyses at Exposures Prior to Eoc.Nonconformance Rept Prepared & Processed by Mgt Review Team | |
| ML20217J613 | 14 July 1997 | Part 21 Rept Re Incomplete Defined Changes Made to Standby DG W/Emd Diesel Engines by Mfg | |
| ML20140E967 | 9 June 1997 | Interim Part 21 Rept Re Possibility of non-conservative Fraction of Power Deposited in Hot Rod Under Voided Core Conditions on 970421.Nonconformance Rept Has Been Prepared & Processed by Mgt Review Team | |
| 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 | |
| ML20141K778 | 22 May 1997 | Part 21 Rept Re Critical Heat Flux Data Base Range Not Extensive Enough to Adequately Estimate Uncertainties for Additive Constants Used in Critical Heat Flux Correlation. Safety Limit Calculations Revised | |
| ML20148B018 | 2 May 1997 | Part 21 Rept Re Failure of Plunger on Solenoid Number 1 to Return to de-actuated Position in Timely Manner When Solenoid Was de-energized.Caused by Plunger Moving While in Energized Condition.Added 'Noise' Test | |
| ML20134Q080 | 27 November 1996 | Part 21 Rept Re Deficiency of Wkm Model 70-13 Pneumatic Actuators Manufactured by Anchor Darling Valve Company Due to Incorrect Calculation of Bench Set & Supply Air Set Points.All Affected Valves Have Been Reviewed & Evaluated | Anchor Darling |
| ML20134D857 | 28 October 1996 | Part 21 Rept Re Steam Isolation Valved Failed to Close within 3-5 Seconds Required by Ts.Caused by One Plunger from Solenoid Missed Machining Operation After Vitron Insert Pressed In.Solenoid Energized | |
| ML20128F501 | 4 October 1996 | Part 21 Rept & Deficiency Rept Re Wkm Model 70-13 Pneumatic Actuators Mfg by Anchor Darling Valve Co.All Affected Valves Being Reviewed/Evaluated & Design Changes Are Being Initiated as Required | Anchor Darling |
| ML20117P314 | 11 September 1996 | Part 21 Rept Re Deficiency of GE Type RMS-9 Overcurrent Trip Device Programmers | Safe Shutdown |
| ML20095K391 | 21 December 1995 | Final Part 21 Rept 95-015 Re Bldg of Achor Darling Valves W/ Cavitation Trim.Plant Will Perform Monthly Testing of Running Loads on a Loop Valve Until Modified | Time of Discovery Anchor Darling |
| ML20082B527 | 28 March 1995 | Part 21 Rept Re Notification 9505 Automatic Switch Co Pilot Solenoid Valve Model NP8323A20V.Caused by Failures of MSIVs to Close to Asco Pilot Solenoid Valves.Subj Valves Replaced W/Valcor 3-way Solenoid Valves | Time of Discovery |
| ML20082E190 | 27 March 1995 | Part 21 Rept Re Sticking of B Core Assembly to Plugnut on Automatic Switch Co Dual Solenoid Valve Model NP8323A20V. Unit 2 Valves Replaced.Unit 1 Valves Will Be Replaced | Time of Discovery |
| ML20078S193 | 21 December 1994 | Final Part 21 Rept Re Nonconservative Assumptions of Turbine Bypass Vot in Plant Transient Analyses for Unit 2.GE Analyses Determined That Deviation Created Potential Substantial Safety Hazard | Time of Discovery Feedwater Controller Failure |
| ML20069A863 | 17 May 1994 | Final Part 21 Rept Re Secondary Containment Isolation Techno Corp Dampers Equipped W/Parker Hannifin Air Cylinders at LaSalle County Station.All Units 1 & 2 Techno Dampers Equipped W/Parker Air Cylinders Replaced | |
| ML20070N345 | 2 May 1994 | Part 21 Rept Re Failures of Limit Switch Series EA740-86700 Mfg by Namco Controls Co Due to Excessive Amount of Grease on Contact Block & Contact Carrier & Wrong Matl of O-ring. Series EA740-86700 Switches Replaced w/EA740-50100 Switches | |
| ML20063D086 | 2 February 1994 | Part 21 Rept Re Possible Anomaly W/Namco Controls EA740 & EA750 Series Limit Switches.Investigation in Progress & Has Not Been Concluded.Vendor Will Advise NRC within Next Thirty Days Re Matter as Addl Info Becomes Available | |
| 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 | |
| ML20056D707 | 15 July 1993 | Part 21 Rept Re Reportable defect-75 PSIG Relief Check Valve 1 Npt,Emd 9521844,Kepner 416C-1-75 | |
| ML20072R673 | 27 March 1991 | Part 21 Rept Re Increased Air Leakage in Pathway Bellows Corp Bellows Assembly.Assembly Replaced by Parker-Metal Bellows Corp | Through-Wall Leak |
| 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 | |
| ML20153G011 | 6 May 1988 | Part 21 Rept Re Potential Defect in Bussman Buss KTK-R Fuse Blocks W/Part Numbers 2078,2079 & 2080.Purchasing Records Reviewed to Identify If Any Parts Were Actually Used or Shipped to Customers.Results Listed | |
| 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 | |
| ML20212E563 | 19 December 1986 | Part 21 Rept Re Valve Problem.Houghto 620 Lubricant Attacks & Degrades Aluminum in Valves.Valves Have Been or Being Rebuilt | |
| ML20215D237 | 9 December 1986 | Part 21 Rept Re Environ Qualification of AMP Butt Splices in GE Drywell Penetrations.Splices Retested by Simulating Postulated LOCA & Failed Due to Excessive Leakage.Ge Contacted Re Repair of Splices | |
| ML20213F966 | 10 November 1986 | Part 21 Rept Re Failure of Battery inter-rack Connecting Cable Assembly Supplied by Gnb Batteries,Inc.Initially Reported on 861107.Battery Cables Replaced | |
| ML20214M318 | 4 September 1986 | Potential Part 21 Rept Re Contromatics Actuator W/Jackscrew/ Handwheel Emergency Override Operator.Jackscrew/Handwheel Should Be Used for Emergency Manual Operation Only.Encl Ltr Also Sent to Listed Utils/Ae Firms | |
| ML20207J849 | 25 July 1986 | Part 21 Rept Re Potential Change in Allowable Operating Repeatability Ranges for 1E Qualified Series 9,8 & 1 Pressure Switches.Licensee Calibr Procedures Should Be Amended to Allow for Cycling (Hysteresis) Effects | |
| ML20198R575 | 3 June 1986 | Part 21 Rept Re Failure of 103/B212 Type Differential Pressure Switches to Give Scram During 860601 Feedwater Transient.Investigation Continuing | |
| 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 |
| 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 | |
| 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 | |
| ML20128G510 | 24 May 1985 | Part 21 Rept Re Heat Numbers to Be Added & Deleted from Sublist Sheet A,Based on Review of NRC | |
| ML20117L589 | 14 May 1985 | Part 21 Rept Re Hatch Transfer Starters & Transfer Starter Assemblies.Evaluation of Implementation of QA Program Performed on 850429-0503.Results of Evaluation Verified Seismic Adequacy of Equipment | |
| 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 | |
| ML20099F392 | 8 November 1984 | Part 21 Rept Re Hexcel/Mci Pipe Restraints Found W/Average Dynamic Crush Strength Values Below Acceptable Values. Initially Reported on 841101.Replacement Program in Progress | |
| ML20096A544 | 21 August 1984 | Part 21 Rept Re Ground Fault Failures of Actuation Solenoids for Crosby Safety Relief Valves PRC 84-24.Problem Still Considered Germane Condition.Memo of 840808 Telcon Updating 840615 Interim Rept Encl | |
| ML20086U425 | 24 February 1984 | Followup Part 21 Rept Re Defective Mechanical Snubber Capstan Springs Supplied by Pacific Scientific.Affected Utils Listed.Purchasers Have Been Notified & Advised to Work Directly W/Pacific Scientific in Disposition | |
| ML20083J773 | 22 December 1983 | Final Deficiency Rept Re Defective GE Hma Relays.Initially Reported on 830805.Two Relays Found to Have Insufficient Armature Clearance.Adjustments Made | |
| ML20082Q692 | 2 December 1983 | Final Deficiency Rept 83-07 Re Design Calculation for Fire Water Sys.Initially Reported on 831102.Preliminary Calculations Completed.Final Rept Will Be Submitted Approx 20 Days Prior to Exceeding 5% Power | |
| ML20085K636 | 12 October 1983 | Final Deficiency Rept 83-06 Re Asco Solenoid Valves in Control Rod Drive Sys.Initially Reported on 830912.Valves W/Defective Solenoid Plunger Housings Replaced & Spare Parts in Inventory Examined.Plant Operable | |
| ML20077N615 | 1 September 1983 | Interim Deficiency Rept 83-05 Re Potentially Defective GE Hma Relays Mfg in 1974.Initially Reported on 830805.Two Relays Found W/Insufficient Armature Clearance.Clearance Adjusted.Final Rept Expected by 830923 | |
| ML20076A822 | 8 August 1983 | Corrects Final Deficiency Rept 83-01 Re Riley Temp Indicating Switches.Riley Temp Switches Not Recalibr to Modified Calibr Procedure.Calibr to Be Done Prior to Fuel Load |