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Category:DEFICIENCY REPORTS (PER 10CFR50.55E & PART 21)
MONTHYEARML18016A9011999-04-12012 April 1999 Part 21 Rept Re Defect in Component of DSRV-16-4,Enterprise DG Sys.Caused by Potential Problem with Connecting Rod Assemblies Built Since 1986,that Have Been Converted to Use Prestressed Fasteners.Affected Rods Should Be Inspected ML20236V3121998-07-29029 July 1998 Final Part 21 Rept Re Enterprise DSR-4 & DSRV-4 Edgs.Short Term Instability Was Found During post-installation Testing & Setup as Part of Design mod/post-work Testing Process. Different Methods Were Developed to Correct Problem ML20248A1671998-05-22022 May 1998 Interim Part 21 Re Enterprise DSR-4 & DSRV-4 Emergency diesel.Post-installation Testing Revealed,High Em/Rfi Levels Affected New Controllers,Whereas Original Controllers Were unaffected.Follow-up Will Be Provided No Later than 980731 ML20198E0631998-01-0707 January 1998 Part 21 Rept Re Shipment by Dubose National Energy Svcs,Inc, of 40 Pieces of 4 inch,90 Degree Elbows Which Did Not Meet ASME Section II SA-234 Requirements ML20217K5991997-08-11011 August 1997 Part 21 Interim Rept Re Fafnir S7K Bearing Discrepancies. Further Evaluation of Deviation Is Required & Will Be Completed by 971111 ML18153A1431997-06-10010 June 1997 Part 21 Rept Re Possible Machining Defect in Certain Stainless Steel Swagelok Tube Fitting Bodies.Facilities Have Been Notified About Possible Problem ML20140G4481997-05-0101 May 1997 Part 21 Rept Re Potential Defect in Component of Dsrv & Dsr Enterprise Standby Diesel Generator Sys.Recommends That Springs Be Inspected on Periodic Basis,Such as During Refueling Outages ML20115J3981996-07-22022 July 1996 Interim Part 21 Rept Re 3/4 Schedule 80 Pipe Furnished to Consolidated Power Supply.Investigation Revealed Only One Nuclear Customer Involved in Sale of Matl ML20115D2001996-07-0909 July 1996 Part 21 Rept Re Mfg Defect of Enterprise DSR-4 & DSRV-4 Edgs,Originally Mfg by Calcon Corp.Amot Control Corp Purchased Calcon Product Line & Maintains Design & Production.Valves Returned to Cooper Energy Svcs on 960131 ML20117G4641996-05-14014 May 1996 Part 21 Rept Re Cooper Bessemer Reciprocating Products,Div of Cooper Cameron Corp,Issued Ltr to Define Utils/Plants Containing Similar Equipment as Supplied on Cooper Bessemer Ksv & Enterprise Dsr EDGs ML20100L7411996-02-29029 February 1996 Final Part 21 Rept Re Fan Motor Bearing Indications,Updating Status of Evaluation of Deviation.Bearings for Unit 2 Fcus Inspected & No Linear Indications Noted.Unit 1 Fcu Bearings Will Be Inspected Prior to Upcoming Refueling Outage ML20097A5641996-01-31031 January 1996 Final Part 21 Rept Re Ball Valves Supplied by Cardinal Industrial Products Containing Suspect Pressure Boundary Bolting.Valves Containing Suspect Bolts Returned to Canadian Worcester Controls Ltd to Have Bolting Replaced TXX-9603, Interim Part 21 Rept Re Linear Indication on Fan Motor Bearings Mfg by Fafnir.Bearings Provided as Spares for Four UPS Room Fan Coil Units.Further Evaluation Required & Evaluation Will Be Completed by 9602291996-01-29029 January 1996 Interim Part 21 Rept Re Linear Indication on Fan Motor Bearings Mfg by Fafnir.Bearings Provided as Spares for Four UPS Room Fan Coil Units.Further Evaluation Required & Evaluation Will Be Completed by 960229 ML20092H3641995-09-13013 September 1995 Part 21 Rept Re 3/4 Inch ASME Section III Class 2 Ball Valves Supplied by Canadian Worcester Controls Ltd (Cwcl) ML20064G3391994-03-0707 March 1994 Part 21 Rept Re RTP Universal I/O Controller Interface Card Utilized in Universal I/O Controller,Supplied for Installation at Comanche Peak & Yonggwang Nuclear Power Plant,Units 3 & 4.Two Filter Capacitors Added to Design ML20064G3261994-03-0707 March 1994 Part 21 Rept Re RTP Universal I/O Controller Interface Card Utilized in Universal I/O Controller Supplied for Installation at Comanche Peak.Design Corrected Through Engineering Change Order Adding Two Filter Capacitors ML20064G3441994-03-0707 March 1994 Part 21 Rept Re RTP Universal I/O Controller Interface Card Utilized in Universal I/O Controller Supplied for Installation at Comanche Peak.Design Corrected Through Engineering Change Order Adding Two Filter Capacitors ML20063K6791994-02-16016 February 1994 Part 21 Rept Re Failed Bolting on Pacific Air Products Co Gravity Dampers.Failed Bolts Replaced W/Higher Strength Bolts ML20058K3841993-12-0909 December 1993 Part 21 Rept Re Potential Defect in Component of Dsrv & Dsr Enterprise Standby DG Sys,Regarding Potential Problem W/ Subcover Assembled Atop Power Head ML20059A7181993-10-19019 October 1993 Part 21 Rept Re Defective Rocker Arms Supplied to TU & Clei. Rocker Arms Machined & Inspected to Incorrect Print & Discovered at Tu.Defective Rocker Arms Recalled from Nuclear Customers.No Corrective Action Required at Respective Utils ML20024H8341993-08-19019 August 1993 Part 21 Rept Re Potential Problem W/Installation of Bushing in gear-type,3 Gpm,Oil Pump Used in Refrigerant Compressors, Mfg by Dunham-Bush.CVI Will Call for Hold Point in Fabrication Process Where Bushing Installed ML20012G3261993-02-18018 February 1993 Part 21 Rept Re Borg-Warner Bolted Bonnet Swing Check Valve Failing to Close During Preoperational Testing.Caused by Internal Body Wall Protrusions Resulting from Intersecting Machine Bores.Design Mods Will Be Implemented ML20128M7821993-02-12012 February 1993 Part 21 Rept Re Failure of 4-inch,150 Bolted Bonnet Swing Check Valve 2CC-0697 to Fully Close During Preoperational Testing.Disc Design Mod Installed.New Disc Component Should Be Installed or Existing Disc Refurbished ML20127P6151993-01-22022 January 1993 Final Deficiency Rept CP-92-019 Re Steam Leak Discovered in Train a RHR Pump Casing Gasket & Seal on 920729.No Apparent Damage to Seal Noted.Item Not Reportable Per 10CFR50.55(e) or Part 21 ML20127L4661993-01-20020 January 1993 Suppl to Final Deficiency Rept CP-89-015,provided on 921130 Re Check Valves 2CC-0693 & 2CC-0697 Failure to Close on 921201.Valves Reworked & Retested Satisfactorily.Supplier Bw/Ip Advised of Test Failures,Cause & Corrective Actions ML20127H2301993-01-15015 January 1993 Part 21 Rept Re Potential Defeat in Component of Dsrv & Dsr Enterprise Standby DG Sys.Starting Air Distributor Housing Assemblies Installed as Replacement Parts at Listed Sites ML20127A1201993-01-0808 January 1993 Supplemental Deficiency Rept CP-92-004 Re Mfg Defects in Printed Circuit Boards for Elgar Class 1E Electric Power Inverters.Initially Reported on 920513.Baseline Data Established for Each Printed Circuit Board ML20127C2191993-01-0707 January 1993 Supplemental Deficiency Rept CP-92-010 & Final Deficiency Rept CP-92-020 Re Cracks in Containment Spray Pump Suction Vent Piping,Initially Reported on 920722 & 1204, Respectively.Unacceptable Configurations Modified TXX-9262, Suppl to Final Deficiency Rept CP-87-122 Re Overstress Condition in Various Equipment Nozzles.Initially Reported on 871125.Nozzle Loads Specified for Applicable Equipment Qualified & within Stress Limits Specified in FSAR1992-12-31031 December 1992 Suppl to Final Deficiency Rept CP-87-122 Re Overstress Condition in Various Equipment Nozzles.Initially Reported on 871125.Nozzle Loads Specified for Applicable Equipment Qualified & within Stress Limits Specified in FSAR ML20126J5961992-12-31031 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 ML20126E1551992-12-22022 December 1992 Supplemental Deficiency Rept CP-92-007 on QA Program Breakdown of Kranco,Inc Re Parts for Polar Crane Supplied W/O Dedicated QA Program.Initially Reported on 920814.Util Will Not Utilize Supplied Components for Critical Lifts ML20126C7691992-12-18018 December 1992 Final Deficiency Rept CP-92-018 Re Steam Leak Discovered in 3-inch Schedule 80 Lateral Installed SG Blowdown Sys. Initially Reported on 920729.Caused by Porosity in Initial Casting.Item Not Reportable Per 10CFR50.55(e) or Part 21 ML20125D5431992-12-11011 December 1992 Final Deficiency Rept CP-92-016 Re Stems on Borg-Warner manually-operated 3-inch Gates Valves Separating from Disks. Initially Reported on 920911.Addl Administrative Controls Will Be Implemented to Prevent Inadvertent Damage ML20125D3871992-12-0808 December 1992 Interim Deficiency Rept CP-92-019:on 920729,steam Leak Discovered in Train a RHR Pump Casing Gasket & Seal During Hot Functional Testing.Deviation Being Evaluated.Evaluation Will Be Complete by 930125 ML20125A9511992-12-0404 December 1992 Part 21 Rept,Providing Major Milestone Schedule & Portions of Part 21 Open Items List of Issues Currently in Review TXX-9253, Final Deficiency Rept CP-89-015 Re Backleakage Through AFW Check Valves Supplied by Bw/Ip Intl,Inc.Initially Reported on 890519 & Documented in Insp Rept 50-446/92-25. Check Valves Will Be Inspected Prior to Fuel Load1992-11-25025 November 1992 Final Deficiency Rept CP-89-015 Re Backleakage Through AFW Check Valves Supplied by Bw/Ip Intl,Inc.Initially Reported on 890519 & Documented in Insp Rept 50-446/92-25. Check Valves Will Be Inspected Prior to Fuel Load ML20116E2991992-11-0303 November 1992 Part 21 Rept Forwarding CPSES Major Milestone Schedule & Portions of Part 21 Open Items List of Issues That Are Currently in Review ML20116C6001992-10-30030 October 1992 Final Deficiency Rept CP-92-010 Re Containment Spray Pump Vent Weld Cracks.Initially Reported on 920722.Vent Pipe Replaced & Containment Spray Pump Vibration Being Corrected, Per Steady State Vibration Monitoring Test ML20116C4631992-10-30030 October 1992 Final Deficiency Rept CP-92-08 Re Train B Diesel Generator Auxiliary Lube Oil Pump Valve.Initially Reported on 920722. All Nine Valves in Warehouse Have Been Magnetic Particle Examined ML20116D1571992-10-29029 October 1992 Final Deficiency Rept CP-92-12 Re Deviation in Several Spare ferro-resonant Transformers.Initially Reported on 920618. Caused by THD Measurement Exceeding Westinghouse Equipment Spec Criteria.Not Reportable Per 10CFR50.55(e) or Part 21 ML20115H0771992-10-20020 October 1992 Final Deficiency Rept CP-92-017 Re Improper Position of Seal Water Circulating Ring on Train a RHR Pump Supplied by Intersoll-Rand.Initially Reported on 920921.Motor Raised & Disassembled to Position Circulating Ring Properly ML20115C1781992-10-13013 October 1992 Interim Deficiency Rept SDAR-CP-92-016,re Defect in Two Manually Operated 3 Inch Gate Valves,In Which Stems Separated from Disks & Disks Being Wedged in Seats.Initially Reported on 920911.Internals of Two Valves Replaced TXX-9247, Final Deficiency Rept CP-86-41 Re Effect of Small Break LOCA During Mode 4 Operation.Initially Reported on 860528. Westinghouse Owners Group Program Modified to Eliminate Use of leak-before-break Methodology1992-10-0202 October 1992 Final Deficiency Rept CP-86-41 Re Effect of Small Break LOCA During Mode 4 Operation.Initially Reported on 860528. Westinghouse Owners Group Program Modified to Eliminate Use of leak-before-break Methodology ML20106C0201992-09-28028 September 1992 Interim Deficiency Rept CP-92-018 Re 920728 Discovery of Steam Leak in 3-inch Schedule 80 Lateral Installed in Steam Blowdown Sys.Evaluation of Deviation Will Be Completed by 921112 ML20105C7951992-09-17017 September 1992 Final Deficiency Rept CP-92-015 Re GE Circuit Breaker Mounting Hardware Incorrectly Supplied & Installed.Initially Reported on 920623.Mounting Screws Will Be Replaced by 921018 ML20105B7211992-09-11011 September 1992 Final Deficiency & Part 21 Rept CP-92-13 Re Defect in Train a DG Lube Oil Pressure Regulating Valve Supplied by Delaval Engine & Compressor Div of Cooper Energy Svcs.Initially Reported on 920812.Deviation Not Reportable ML20105B7231992-09-11011 September 1992 Final Deficiency Rept CP-92-14 Re Defect in Train B EDG Gearcase Lube Oil Supply Line Flange,Supplied by Delaval Compressor Div of Cooper Energy Svcs.Initially Reported on 920812.Shaft,impeller & Bushings Replaced ML20127D1491992-09-0404 September 1992 Part 21 Rept Re Defect in Component of DSRV-16-4 Enterprise Standby DG Sys Jacket Water Pump Shaft.Caused by Incorrect Tapers Machined on Shaft Due to Vendor Mismatching.All Affected Shafts Recalled & Quality Insp Plans Changed ML20114B8291992-08-28028 August 1992 Interim Deficiency Rept CP-86-41 Re Evaluation of Effect of Small Break LOCA During Mode 4 Operation.Initially Reported on 860528.Review of WCAP-12476 Not Yet Completed.Update, Providing Conclusion of Review,Will Be Submitted by 921030 TXX-9237, Interim Deficiency Rept CP-92-08 Re Large Piece of Casting Broken from Seating Area of Lube Oil Pump Suction Check Valve.Initially Reported on 920722.Final Rept Will Be Submitted by 9210301992-08-21021 August 1992 Interim Deficiency Rept CP-92-08 Re Large Piece of Casting Broken from Seating Area of Lube Oil Pump Suction Check Valve.Initially Reported on 920722.Final Rept Will Be Submitted by 921030 1999-04-12
[Table view] Category:TEXT-SAFETY REPORT
MONTHYEARML20217E8021999-10-0707 October 1999 CPSES Unit 1 Cycle 8 Colr ML20217G4151999-09-30030 September 1999 Monthly Operating Repts for Sept 1999 for Cpses,Units 1 & 2 ML20212F7671999-09-24024 September 1999 SER Granting Relief Request C-4 Pursuant to 10CFR50.55a(g)(6)(i) for Unit 2,during First 10-year ISI Interval & Relief Requests B-15,B-16 & B-17 Pursuant to 10CFR50.55a(g)(6)(i) ML20216J5701999-09-16016 September 1999 Rev 2 to CPSES Unit 2 Cycle 5 Colr TXX-9920, Monthly Operating Repts for Aug 1999 for Cpses.With1999-08-31031 August 1999 Monthly Operating Repts for Aug 1999 for Cpses.With ML20211M2981999-08-0606 August 1999 Rev 1 to CPSES Fuel Storage Licensing Rept, CPSES Credit for Soluble Boron & Expansion of Spent Fuel Storage Capacity, Consisting of Revised Title Page and 4-1 ML20210U4081999-07-31031 July 1999 Monthly Operating Repts for July 1999 for Cpses,Units 1 & 2 ML20210D8321999-07-23023 July 1999 Safety Evaluation Accepting Relief Requests Re Use of 1998 Edition of Subsections IWE & Iwl of ASME Code for Containment Insp ML20209H7661999-07-15015 July 1999 Safety Evaluation Accepting GL 95-07, Pressure Locking & Thermal Binding of Safety-Related Power-Operated Gate Valves, for Comanche Peak Steam Electric Station,Units 1 & 2 ML20209H2721999-07-0909 July 1999 2RF04 Containment ISI Summary Rept First Interval,First Period,First Outage ML20209H2631999-07-0909 July 1999 2RF04 ISI Summary Rept First Interval,Second Period,Second Outage ML20209G7501999-07-0808 July 1999 SER Finding That Licensee Individual Plant Exam of External Events Complete with Regard to Info Requested by Suppl 4 to GL 88-20 & That IPEEE Results Reasonable Given Design, Operation & History of Comanche Peak Steam Electric Station ML20196L0191999-07-0808 July 1999 Safety Evaluation Granting Request Relief B-6 (Rev 2),B-7 (Rev2),B-12,B-13,B-14 & C-9,pursuant to 10CFR50.55a(g)(6)(i).Technical Ltr Rept Also Encl ML20210J9391999-06-30030 June 1999 CPSES Commitment Matl Change Evaluation Rept 0003,for 970802-990630 ML20209G0801999-06-30030 June 1999 Monthly Operating Repts for June 1999 for Cpses,Units 1 & 2 ML20196J0621999-06-29029 June 1999 Safety Evaluation Supporting Proposed Changes to Emergency Plan Re Licenses NPF-87 & NPF-89 Respectively ML20195G5141999-05-31031 May 1999 Monthly Operating Repts for May 1999 for Comanche Peak Steam Electric Station,Units 1 & 2.With ML20216E0711999-05-21021 May 1999 1999 Graded Exercise - Comanche Peak Steam Electric Station ML20206Q0091999-05-14014 May 1999 Safety Evaluation Accepting GL 92-08, Thermo-Lag 330-1 Fire Barriers, Dtd 921217,for Comanche Peak Electric Station,Unit 1 ML20206H2061999-05-0606 May 1999 SER Accepting Exemption to App K Re Leading Edge Flowmeter for Plant,Units 1 & 2 ML20196L2241999-04-30030 April 1999 Monthly Operating Repts for Apr 1999 for Cpses,Units 1 & 2 ML20205R5701999-04-14014 April 1999 Rev 6 to ER-ME-067, TU Electric Engineering Rept,Evaluation of Thermo-Lag Fire Barrier Sys ML18016A9011999-04-12012 April 1999 Part 21 Rept Re Defect in Component of DSRV-16-4,Enterprise DG Sys.Caused by Potential Problem with Connecting Rod Assemblies Built Since 1986,that Have Been Converted to Use Prestressed Fasteners.Affected Rods Should Be Inspected ML20205J7831999-04-0101 April 1999 Rev 0 to ERX-99-001, CPSES Unit 2 Cycle 5 Colr ML20205N3101999-03-31031 March 1999 Monthly Operating Repts for Mar 1999 for Cpses,Units 1 & 2 ML20204H6371999-02-28028 February 1999 Monthly Operating Repts for Feb 1999 for Comanche Peak Units 1 & 2 ML20205N1481999-02-28028 February 1999 Corrected Monthly Operating Rept for Feb 1999 for CPSES, Units 1 & 2 ML20203A4881999-02-0303 February 1999 Safety Evaluation Granting Requests for Relief B-3 - B-6,C-2 & C-3 for Plant,Unit 2 ML20210J9201999-02-0101 February 1999 CPSES 10CFR50.59 Evaluation Summary Rept 0008,for 970802- 990201 ML20202D0101999-01-27027 January 1999 Safety Evaluation Supporting First 10-yr Interval ISI Program Plan Requests for Relief B-9,B-10 & B-11 for CPSES, Unit 1 ML20199E9961998-12-31031 December 1998 Monthly Operating Repts for Dec 1998 for Cpses,Units 1 & 2 ML20207D6091998-12-31031 December 1998 1998 Annual Operating Rept for Cpses,Units 1 & 2. with ML20197K2371998-11-30030 November 1998 Monthly Operating Repts for Nov 1998 for Cpses,Units 1 & 2 ML20195F3161998-10-31031 October 1998 Monthly Operating Repts for Oct 1998 for Cpses,Units 1 & 2 ML20154M8841998-09-30030 September 1998 Monthly Operating Repts for Sept 1998 for Cpses,Units 1 & 2 ML20154B5741998-09-30030 September 1998 Safety Evaluation Re Licensee Response to GL 96-05, Periodic Verification of Design-Basis Capability of Safety- Related Motor-Operated Valves. Licensee Has Established Acceptable Program ML20151W0361998-08-31031 August 1998 Monthly Operating Repts for Aug 1998 for Cpses,Units 1 & 2. with ML20151Q1211998-08-14014 August 1998 Rev 0 to Control of Hazard Barriers ML20237C4061998-08-14014 August 1998 Safety Evaluation Supporting Request to Implement Risk Informed IST Program ML20237C6721998-07-31031 July 1998 Monthly Operating Repts for July 1998 for Cpses,Units 1 & 2 ML20236V3121998-07-29029 July 1998 Final Part 21 Rept Re Enterprise DSR-4 & DSRV-4 Edgs.Short Term Instability Was Found During post-installation Testing & Setup as Part of Design mod/post-work Testing Process. Different Methods Were Developed to Correct Problem ML20236R0711998-06-30030 June 1998 Monthly Operating Repts for June 1998 for Cpses,Units 1 & 2 ML20249B2581998-05-31031 May 1998 Monthly Operating Repts for May 1998 for Cpses,Units 1 & 2 ML20248A1671998-05-22022 May 1998 Interim Part 21 Re Enterprise DSR-4 & DSRV-4 Emergency diesel.Post-installation Testing Revealed,High Em/Rfi Levels Affected New Controllers,Whereas Original Controllers Were unaffected.Follow-up Will Be Provided No Later than 980731 ML20247G3241998-04-30030 April 1998 Monthly Operating Repts for Apr 1998 for Cpses,Units 1 & 2 ML20216B8661998-04-0101 April 1998 Rev 0 to ERX-98-001, CPSES Unit 1 Cycle 7 Colr ML20216J3061998-03-31031 March 1998 Monthly Operating Repts for Mar 1998 for Cpses,Units 1 & 2 ML20216J1861998-02-28028 February 1998 Monthly Operating Repts for Feb 1998 for Comanche Peak Steam Electric Station ML20197A6951998-02-24024 February 1998 Inservice Insp Summary Rept,First Interval,Second Period, First Outage ML20199J5391998-02-0202 February 1998 CPSES Commitment Matl Change Evaluation Rept 0002 for 960202-970801 1999-09-30
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g Limitorque Corporation
- Automoted Volve Actuotors and Jacks for IndAfry-5114 Woodoll Road P.O. Box 11318 Lynchburg, VA 245061318 rp l Telephone-804 528 4400
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d Director, Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, DC Gentlemen:
Subject:
10 CFR Part 21 Report Refe.ence: H3BC Worm Gears Limitorque Corporation is notifying the commission of a potencial defect in the worm gear component of type H3BC valve actuators. Reportability was determined by Limitorque Corporation on March 17, 1988.
Background:
Stone and Webster, acting on behalf of Tu Electric, advised Fisher Controls of a defect in the worm gears of two H3BC actuators furnished by Fisher Controls to the Comanche Peak Steam Electric Station. The actuators were supplied by Limitorque Corporation on S/0 No. 3A6274-A and 3A6274-B in 1978.
Fisher Controls advised Limitorque Corporation on January 29, 1988, of Stone and Webster's findings. Limitorque Corporation visited the Comanche Peak site on February 4, 1988. Two cracked H3BC worm gears were observed. These gears were sectioned in halves and a section of each gear was returned to Limitorque Corporation for failure analysis.
Analysis:
The Limitorque Corporation Engineering Department has concluded that the presence of porosity in the cast worm gear is the root cause of failure.
Further, it was cor.cluded that failure cf a worm gear component with similar deficiencies would be instantaneous upo. gear loading and would be evident at the time of installation. There is no indication of a previous failure associated with the presence of casting porosity.
l Corrective Action:
Limitorque has advised Fisher Controls that actuators supplied on S/0 No.
3A6274-A (quantity 4) and S/O No. 3A6274-B (quantity 16) be inspected for l
l similar deficiencies.
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8803250320 880318 i PDR ADOCK 05000445 S DCD
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LIMITORQUE CORPORATION Sheet NB. 2 Action to Prevent Recurrence:
All H3BC worm gear castings presently in stock have been visually inspected for evidence of casting porosity. No porosity has been observed.
Additionally, a sampling of components has been sectioned or X-rayed with no j porosity or defects observed.
i Further, all safety related worm gear components will be subject to a documented inspection verifying the absence of casting porosity. This inspection will be implemented on March 21, 1988.
Conclusion:
The root cause of failure (casting porosity) is the result of the casting process. Limitorque Corporation has not been previously advised of a failure associated with the presence of worm gear casting porosity. It is judged that a casting "lot" or a portion of that casting "lot" may be defective. Effocts to obtain "lot" traceability have been inconclusive due to the fact that the probable casting supplier discontinued operations in 1983.
Limitorque Corporation recommendations are as follows:
- 1. Inspect worm gear components of H3BC actuators that have not yet been placed in service.
- 2. H3BC actuators that have been previously operated under load should have the worm gear component inspected at the utilities' discretion.
- 3. The required inspection procedures are attached.
Limitorque Corporation is requesting the commission's recommanded mailing list to transmit this information to the industry.
Very truly yours, LIMITORQyECORPORATIO,N ff bL faddbd P. G. McQuillan Q. A. Administrator jh pc: T. Mignogna F. Denham
- 1. Wilkinson W. Miluszusky
ENGINEERING INSTRUCTION PROCEDURE Section B.4.5.1 SUB-ASSEMBLY INSTALLATIONS Sheet 1 of 2 H3BC DRIVE SLEEVE 900 WORM GEAR Prepared By DJM j ASSEMBLY DWG. 01-440-0354-4 IssueDate3/17/88Appvdjf3p4)/j/}yr.s9' IDENTIFICATION /PART NO. EIP-0051 Rev. Date Appvd The following is a step-by-step description for removing the drive sleeve Assembly Items 24, 25, 29, and 30. These instructions are intended to be used in conjunction with the assembly drawing listed above.
Before proceeding, the actuator must be disassembled from its mounting and free of all mechanical loads.
DISASSEMBLY;
- 1. Caution: This actuator is filled with grease. Prepare to recover any grease that flows from the actuator during disassembly. All grease that flows f rom the actuator must be replaced during reassembly.
- 2. Set the actuator in a clean area and prepare to disassemble the unit.
- 3. With the unit in an upright position, worm shaf t , Item 31, horizontal and pointer, Item 16 on top, remove stem nut, Item 28. Remove fasteners, Items 19 and 20 that secure housing cover, Item 14 to housing, Item 1. Remove fasteners, Items 21 and 23 that secure pointer cap, Item 15, to drive sleeve, Item 25.
- 4. Remove assembly of pointer cap, Item 15, and potnter, Item 16. Remove housing cover, Item 14, bearing, Item 7 (Item 7 is press fit to Item 14), and o-ring, Item 8. Remove gasket set, Item 5.
- 5. Remove fasteners, Items 11 and 12, that secure cover-limit stop, Item 3, to housing-limit stop, Item 2. Rotate nuts, Items 27, to the center position (away from housing, Item 2) to enable worm shaf t, Item 31, to be rotated. Rota te vorm sha f t , Item 31, until worm gear, Item 24, is disengaged f rom worm shaf t, Item 31 (rotate nuts, Item 27, as required to achieve disengagement).
! 6. Remove drive sleeve assembly that consists of Items 24, 25, 29, and 30.
Lift this assembly out of housing and set aside.
- 7. If further disassembly of the drive sleeve assembly is required, remove nuts, Item 30, from bolts, Item 29. Remove bolts, Item 30.
i Remove dowel pins, Item 26. Remove wo rm gea r, Item 24, fron drive sleeve, item 25.
l l
l ASSEMBLY:
l During assembly, spread a thin coat of grease on all o-rings and quad rings.
i Use Step 8 if worm gear, Item 24, is being reinstalled (was not replaced with a new part). Use Step 9 if the worn gear, Item 24, is being replaced by a new l worm gear. Then proceed to Step 10.
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ENGINEERING INSTRUCTION PROCEDURE Section B.4.5.1 SUB-ASSEMBLY INSTALLATIONS Sheet 2 of 2 H3BC DRIVE SLEEVE 900 WORM GEAR Prepared By DJM ASSEMBLY DWG. 01-440-0354-4 IssueDate3/17/88Appvd)h#47" /87'. //
IDENTIFICATION /PART NO. EIP-0051 Rev. Date Appvd
- 8. Install worm gear, Item 24, on drive sleeve, Item 25. Install two dowel pins, Item 26. Secure worm gear to drive sleeve with bolts, Item 29, and nuts, Item 30.
- 9. Secure worm gear to Item 24 to drive sleeve, Item 25, with fasteners, Items 29 and 30. Ream the two 23/64 inch diameter holes in Items 24 and 25 to a diameter of .3745/.3750 inches. Install two dowel pins, Item 26, to secure Items 24 and 25 to each other.
- 10. Verify o-ring, Item 8, is installed in housing, Item 1. Install drive sleeve assembly of Items 24, 25, 29, and 30 into housing, Item 1.
- 11. Rotate vorm shaf t, Item 31, and the drive sleeve assembly in a manner to engage these two gears. Engage to a position as shown on the assembly drawing (rotate nuts, Item 27 as required to achieve engagement).
- 12. Replace all grease back into the actuator. Clean the gasket surfaces of housing, Item 1, and housing cover, Item 14, to insure gasket, Item 5, will seal properly. Install gasket, Item 5.
- 13. Install o-ring, Item 8, in housing cover, Item 14. Install housing cover, Item 14, and bearing, Item 7, secure cover, Item 14, to housing, Item 1, with fasteners, Items 19 and 20.
t 14. Install and secure pointer cap assembly to drive sleeve, Item 25, with l fasteners, Items 21 and 23.
1
- 15. Install actuator. Set stop nuts, Item 27, to restrict travel. After setting, rotate nuts so a flat on each nut will face cover, Item 3, l after assembly.
- 16. Clean the gasket surfaces of housing, Item 2, and cover, Item 3, to insure gasket, Item 6, will seal properly. Install gasket, Item 6 L
and cover, Item 3. Secure Items 3 and 6 to housing, Item 2 with fasteners, Items 11 and 12.
- 17. The actuator is ready for service.
l 1
ENGINEERING INSTRUCTION PROCEDURE Section B.8.1.1.1 INSPECTION Sheet I of 1 POROSITY Prepared By DJM WORM GEAR HBC 900 WORM GEAR Issue Date 3/17/88 IDENTIFICATION /PART NO. EIP-0052 Rev. Date Appvd M A /,,/.
The following is a detailed standard intended to establish the inspection procedure / criteria for acceptance / rejection of the H3BC 900 worm gear based on a visual inspection of all external surfaces.
- 1. Thoroughly clean all surfaces of the worm gear. Remove all grease and foreign matter.
- 2. Visually examine all surfaces for porosity (blow holes, pin holes, etc.)
- 3. If any porosity is present, the worm gear must be replaced.
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