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Category:DEFICIENCY REPORTS (PER 10CFR50.55E & PART 21)
MONTHYEARML20217A1691999-09-22022 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 ML20207M9231999-03-12012 March 1999 Amended Part 21 Rept Re Cooper-Bessemer Ksv EDG Power Piston Failure.Total of 198 or More Pistons Have Been Measured at Seven Different Sites.All Potentially Defective Pistons Have Been Removed from Svc Based on Encl Results ML20140A9661997-05-29029 May 1997 Part 21 Rept Re Ksv Emergency Diesel Generator Power Piston Failure.Caused by Jacket Water in Combustion Chamber. Recommends That Users Verify That Crown Thickness at Valve Cutout Be 100 Minimum NSD-NRC-97-5093, Part 21 Rept Re W Identified Defects That Could Create Substantial Safety Hazard Should Defect Remain Uncorrected. Plans to Complete Proper Refurbishment of All of Returned Breakers Being Established1997-05-14014 May 1997 Part 21 Rept Re W Identified Defects That Could Create Substantial Safety Hazard Should Defect Remain Uncorrected. Plans to Complete Proper Refurbishment of All of Returned Breakers Being Established ML20210E3591997-03-27027 March 1997 Part 21 Rept Re Sorrento Electronics Inc Has Determined Operation & Maint Manual May Not Adequately Define Requirements for Performing Periodic Surveillance of SR Applications.Caused by Hardware Failures.Revised RM-23A ML20137G6261997-03-25025 March 1997 Svcs Part 21 Rept Re Emergency Generators Installed at Zion Station Which Developed Significant Drop in Crankcase Lube Oil Level.Caused by Crack in Liner Wall,Allowing Jacket Water to Enter Chamber ML20135E3811997-03-0303 March 1997 Part 21 Rept Re Output Drift W/Increasing Temperature on Several RTD Amplifiers Noted During Installation of RTD by-pass Mod at Station.Action to Identify All Circuit Cards W/Affected Date Codes,Identified 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 ML20097J6351996-01-30030 January 1996 Part 21 Rept Re Intermittent Failure of DG Relay Mfg by Amerace Electronic Components.Suspect Relays at Plants Identified & Replaced.Amerace Indicated That Operators & QC Personnel Made Aware of Need for Proper Soldering ML20096E6511996-01-18018 January 1996 Part 21 Rept Re Failure of MOV Motor Pinion Gear Mfg by Limitorque at Byron Station.Replacement & Insp Activities Initiated for Potentially Impacted Populations of MOVs at Byron & Braidwood Stations ML20094R7391995-11-28028 November 1995 Potential Part 21 Rept Re Ksv EDG Sys Mfg by Cooper-Bessemer Reciprocating Products Div,Div of Cooper Cameron Corp. Recommends That All Utils Verify Open Oil Passage in Assembly ML20082Q9491995-04-21021 April 1995 Part 21 Rept Re Notifying Commission of Potential Design Defect of Ksv EDG Sys ML20077D3431994-11-29029 November 1994 Part 21 Rept Re Suspect Master Connecting Rods & Contains Info Location in Engine for Rods ML20078G3051994-11-0909 November 1994 Rev to Part 21 Rept Re Potential Problem W/Master Power Connecting Rods.Vendor Recommends Listed Utils Perform Visual Insp of Master Rods to Determine Applicability of Rept ML20071J1891994-07-22022 July 1994 Final Part 21 Rept Re Cracks Found in Body to Bonnet Nuts on Copes-Vulcan Airoperated Valves.Operability Evaluation for Byron Units 1 & 2,of Affected Valves W/Nuts of Heat Numbers H & I Completed on 940622 ML20073S9541994-06-27027 June 1994 Part 21 Rept Re Incorrect Matl Supply Discovered on Unshipped Order.Pump Div Will Notify Enertech W/ Recommendation That Items Supplied W/Incorrect Matl Be Removed & Destroyed ML20070A1441994-06-22022 June 1994 Part 21 Rept Re Conditions Which Affect Hydraulic Valve Operators Supplied by Bw/Ip to Enertech Co & Listed Utils. Vendor Will Notify Enertech W/Recommendations That All Items Supplied W/Incorrect Matl Be Removed & Destroyed ML20058D7061993-11-24024 November 1993 Part 21 Rept 93-022 Re Itt Std Fluid Technology Corp HX Failure Due to Inadequate Process Control by Mfg.Subj HXs Will Either Be Replaced or Inspected for Proper Rolling Prior to Restart from Current Dual Unit Outage ML20059L9861993-11-11011 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 ML20126F8081992-12-22022 December 1992 Part 21 Rept Re Possible Condition of Gag Plug in Cap of Valves That Cause Valves Not to Lift to Requirement for Providing Full Capacity.Affected Customers Notified.Removal of Caps &/Or Gag Plugs Recommended ML20127M5201992-11-24024 November 1992 Final Part 21 Rept Re Reject Lot Serial Numbers of Defective Fuel Nozzle Tips,Consisting of Corrected Page 6 of 921102 Rept Re Reject Lots for Fuel Injector Assembly ML17223A7451990-01-26026 January 1990 Part 21 Rept Re Backup Rings Furnished in Spare Parts Seal Kits & in 25 Gpm 4 Way Valves as Part of Actuators Made of Incorrect Matl.Rings Should Be Viton & Have Been Identified as Buna N ML20207P0151988-10-0404 October 1988 Part 21 Rept Re Fuel Nozzle Tips in Standby Diesel Generator KSV-20-T W/Cracks Permitting Diesel Fuel to Be Sprayed Into Cylinders.Heavy Vapors Observed Emitting from Breathers on Some Cylinder Heads ML20149H8211988-02-11011 February 1988 Final Deficiency Rept 457/87-01 Re Diesel Engine Generator Rocker Arm Failure.Initially Reported on 870217.Util Took Steps to Determine Strength of Rocker Arms.Low Strength Rocker Arms Replaced W/New Rocker Arms ML20214H8221987-05-15015 May 1987 Interim Deficiency Rept Re Diesel Engine Generator Rocker Arm Failure.Initially Reported on 870217.Test/replacement Program Started,Contingent on Receipt of Replacement Exhaust Rocker Arms from Cooper-Bessemer ML20206Q8821987-04-0202 April 1987 Interim Deficiency Rept Re Diesel Engine Generator Rocker Arm Failure.Initially Reported on 870217.Investigation Emcompasses Both Metallurgical Analysis & Mechanical Interactions.Next Rept Will Be Submitted by 870501 ML20205B6691987-03-17017 March 1987 Deficiency Rept Re Diesel Engine Generator Rocker Arm Failure.Initially Reported on 870217.Diesel Generator Repaired by Honing Out Crosshead to Crosshead Guide Clearance to 0.006 Inches.Next Rept Submitted by 870430 ML20211P7211987-02-23023 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 ML20212H5451987-01-12012 January 1987 Part 21 Rept Re Break of Master Power Rod at Fractured Surface.Caused by Fatigue Failure Originating in Rod When Iron Plating in Articulated Rod Pin Bore Failed,Resulting in Engine Inoperability.Rod Replaced ML20207P1801986-12-29029 December 1986 Final Deficiency Rept 86-02 Re Rejectable Indications During Preservice Insp on Loop 1 Steam Generator.Actions Necessary to Resolve Items Completed,Per Suppls 1 & 2 to NUREG-1002 ML20212D9721986-12-23023 December 1986 Interim Deficiency Rept 84-14 Re Weld & Grindout Identified During Preservice Insp.Initially Reported on 841121.New Data Demonstrates That Indication Size Meets ASME Section XI 1WB-3512,1977 Edition.Indication Grindout No Longer Needed ML20215F9531986-12-19019 December 1986 Part 21 Rept Re Design Error Uncovered in Certain Safety Shutdown Circuits for Standby Diesel Generator.Switches 12E0-1,12E0-2,33E0-1 & 33E0-2 Not Intended to Initiate Emergency Mode Trip as Drawings Indicate ML20214T5111986-11-26026 November 1986 Deficiency Rept Re Misplaced Radiographs for Westinghouse Equipment.Initially Reported on 861030.Item Not Reportable Per 10CFR50.55(e) ML20215H2231986-10-17017 October 1986 Revised Final Deficiency Rept 84-07 Re Crush Strength of Energy Absorbing Matl Used in Pipe Whip Restraints.Removal of Four Addl Restraints in Unit 1 Took Place on 851004 During Unit 1 Outage ML20215G5351986-10-10010 October 1986 Part 21 Rept Re Vendor Tests of air-operated Diaphragm Valves Revealing Natural Frequencies Less than Required Values of 33 Hz.Initially Reported on 841227.No Adverse Effects Noted During Testing ML20215G6801986-10-10010 October 1986 Part 21 Rept Re Vendor Tests of air-operated Diaphragm Valves Revealing Natural Frequencies Less than Required Values of 33 Hz.Initially Reported on 841227.No Adverse Effects Noted During Testing ML20210N6561986-09-26026 September 1986 Final Deficiency Rept 85-06 Re Failure of Diesel Generators 1A & 1B to Sustain Adequate Prime During Testing.Initially Reported on 850822.Fuel Oil Sys Modified & Tested ML20214W5641986-09-19019 September 1986 Deficiency Rept Re 860818 Inadvertent Discharge of Water Into Spent Fuel Pit Where 64 New Fuel Assemblies for Initial Core Load Being Stored.Initially Reported on 860819.Event Not Reportable Per 10CFR50.55(e) ML20210F4781986-09-17017 September 1986 Final Part 21 & Deficiency Rept 86-06 Re Fastener Matl Supplied by Cardinal Industrial Products.Initially Reported on 860617.Fastener Matl Met ASME Code Requirements. Documentation of Corrective Actions Available Onsite ML20203N1931986-09-16016 September 1986 Final Deficiency Repts 84-05 & 84-15 Re Inconsistencies in Documentation of Gk Newberg Structural Steel Installations & Welding Program,Respectively.Initially Reported on 840417. Installation Travelers Reviewed.Deficiencies Resolved ML20214M3181986-09-0404 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 ML20214P5121986-09-0202 September 1986 Final Deficiency Rept 83-08 Re Fabrication of Pullman Sheet Metal Duct Fittings W/O Approved Design Documentation. Initially Reported on 830630.Unit 1 Fitting Mods Completed on 860501.Reworking of 12 Fittings Remain for Unit 2 ML20205F7211986-08-12012 August 1986 Revised Final Deficiency Rept 84-12 Re Removal of Name Plates from ASME Large Bore Spool Pieces.Initially Reported on 840824.Replacement Identification Plate Not Attached to Installed Spool Pieces.Procedure Revised to Reflect Change ML20212K2741986-08-12012 August 1986 Final Deficiency Repts 84-05 & 84-11 Re Boeing Steam Generator Snubber Failure.Initially Reported on 840628. Snubber Functional Test Results Reviewed & Acceptable. Snubbers Refurbished for Listed Units ML20212B3791986-07-29029 July 1986 Interim Deficiency Rept 86-06 Re Fastener Matl Supplied by Cardinal Industrial Products.Initially Reported on 860617. Matls Over 1 Inch in Diameter Shipped During 840109-850815 & Not Included in Notification Ltrs Acceptable ML20206B1371986-06-11011 June 1986 Final Deficiency Rept 84-04 Re out-of-tolerance Radiographic Film Densities.Initially Reported on 840406. Unit 1 Production Welds Repaired &/Or Reradiographed & Welder Qualifications Evaluated & Confirmed ML20211F1971986-06-0505 June 1986 Final Deficiency Repts 86-03 by & 86-05 Bw Re Cold Leg Safety Injection Pipe Vibration & Cracks.Initially Reported on 860430.D Loops Changed to 5-D Bends & Support Added for Addl Stiffness ML20211E3471986-06-0404 June 1986 Final Deficiency Repts 84-06(BY) & 84-14(BW) Re Large Laminar Indication in Steam Generator Snubber Piston Rod End Blade.Initially Reported on 840731.Rod End & Six End Caps Replaced ML20198E8981986-05-20020 May 1986 Final Deficiency Repts 86-01 & 86-03 Re Defective Spot Welds on Cable Tray Hanger Strut Matl.Initially Reported on 860306.Engineering Evaluation Performed for Hangers Remaining W/Suspect Control Numbers ML20197E8261986-05-0909 May 1986 Final Deficiency Rept 86-04 Re 21 Rejectable Weld Indications Identified During Preservice Insp.Initially Reported on 860409.Relief from Repair Requirements Will Be Requested for 12 Unacceptable Indications 1999-09-22
[Table view] Category:TEXT-SAFETY REPORT
MONTHYEARML20217J4791999-10-18018 October 1999 SER Approving Exemption from Certain Requirements of 10CFR73 for Zion Nuclear Power Station,Units 1 & 2.NRC Concluded That Proposed Alternative Measures for Protection Against Radiological Sabotage Meets Requirements of 10CFR73.55 ML20217G9961999-10-14014 October 1999 SER Accepting First 10-year Interval Inservice Insp Requests for Relief for Plant,Units 1 & BW990066, Monthly Operating Repts for Sept 1999 for Braidwood Station, Units 1 & 2.With1999-09-30030 September 1999 Monthly Operating Repts for Sept 1999 for Braidwood Station, Units 1 & 2.With A99026, Monthly Operating Repts for Sept 1999 for Zion Nuclear Power Station,Units 1 & 2.With1999-09-30030 September 1999 Monthly Operating Repts for Sept 1999 for Zion Nuclear Power Station,Units 1 & 2.With ML20217H5221999-09-30030 September 1999 Monthly Operating Repts for Sept 1999 for Byron Station, Units 1 & 2.With ML20217P6351999-09-29029 September 1999 Non-proprietary Rev 6 to HI-982083, Licensing Rept for Spent Fuel Rack Installation at Byron & Braidwood Nuclear Stations ML20217A1691999-09-22022 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 ML20212A7441999-09-10010 September 1999 Safety Evaluation Concluding That Alternatives Contained in Relief Request 12R-07 Provide Acceptable Level of Quality & Safety ML20212B9261999-08-31031 August 1999 Monthly Operating Repts for Aug 1999 for Byron Station,Units 1 & 2.With A99023, Monthly Operating Repts for Aug 1999 for Zion Nuclear Power Station,Units 1 & 2.With1999-08-31031 August 1999 Monthly Operating Repts for Aug 1999 for Zion Nuclear Power Station,Units 1 & 2.With BW990056, Monthly Operating Repts for Aug 1999 for Braidwood Station, Units 1 & 2.With1999-08-31031 August 1999 Monthly Operating Repts for Aug 1999 for Braidwood Station, Units 1 & 2.With ML20211K0401999-08-31031 August 1999 SER Accepting Approval of Defueled Station Emergency Plan & Exemption from Certain Requirements of 10CFR50.47, Emergency Plans for Plants,Units 1 & 2 ML20210R6421999-08-13013 August 1999 ISI Outage Rept for A2R07 ML20210U8111999-08-0404 August 1999 SER Granting Licensee Relief Requests VR-1,VR-3 & Portion of VR-2 Pursuant to 10CFR50.55a(a)(3)(ii).Relief Request VR-4 Does Not Require Explicit NRC Approval Because Relief Applies to Valves Not Required by 10CFR50.55a BW990048, Monthly Operating Repts for Jul 1999 for Braidwood Station, Units 1 & 2.With1999-07-31031 July 1999 Monthly Operating Repts for Jul 1999 for Braidwood Station, Units 1 & 2.With ML20210R3431999-07-31031 July 1999 Monthly Operating Repts for July 1999 for Byron Station, Units 1 & 2.With A99022, Monthly Operating Repts for July 1999 for Zion Nuclear Power Station,Units 1 & 2.With1999-07-31031 July 1999 Monthly Operating Repts for July 1999 for Zion Nuclear Power Station,Units 1 & 2.With ML20210K9861999-07-30030 July 1999 Safety Evaluation Accepting Licensee 60-day Response to GL 96-05, Periodic Verification of Design-Basis Capability of Safety-Related Movs ML20210E2251999-07-21021 July 1999 B1R09 ISI Summary Rept Spring 1999 Outage, 980309-990424 ML20216D3841999-07-12012 July 1999 Revised NFM9900022, Braidwood Unit 2 Cycle 8 COLR in ITS Format & W(Z) Function M990002, Revised NFM9900022, Braidwood Unit 2 Cycle 8 COLR in ITS Format & W(Z) Function1999-07-12012 July 1999 Revised NFM9900022, Braidwood Unit 2 Cycle 8 COLR in ITS Format & W(Z) Function ML20209G1751999-07-0808 July 1999 SG Eddy Current Insp Rept,Cycle 9 Refueling Outage (B1R09) ML20207H7941999-06-30030 June 1999 Rev 0 to WCAP-15180, Commonwealth Edison Co Byron,Unit 2 Surveillance Program Credibility Evaluation ML20207H8071999-06-30030 June 1999 Rev 0 to WCAP-15178, Byron Unit 2 Heatup & Cooldowm Limit Curves for Normal Operations ML20209H3711999-06-30030 June 1999 Monthly Operating Repts for June 1999 for Byron Station, Units 1 & 2.With ML20207H7851999-06-30030 June 1999 Rev 0 to WCAP-15183, Commonwealth Edison Co Byron,Unit 1 Surveillance Program Credibility Evaluation ML20207H7771999-06-30030 June 1999 Rev 0 to WCAP-15177, Evaluation of Pressurized Thermal Shock for Byron,Unit 2 BW990038, Monthly Operating Repts for June 1999 for Braidwood Station, Units 1 & 2.With1999-06-30030 June 1999 Monthly Operating Repts for June 1999 for Braidwood Station, Units 1 & 2.With A99021, Monthly Operating Repts for June 1999 for Zion Nuclear Power Station,Units 1 & 2.With1999-06-30030 June 1999 Monthly Operating Repts for June 1999 for Zion Nuclear Power Station,Units 1 & 2.With ML20207H7621999-06-28028 June 1999 Pressure Temp Limits Rept (Ptlr) ML20207H7561999-06-28028 June 1999 Pressure Temp Limits Rept (Ptlr) ML20195J8001999-05-31031 May 1999 Monthly Operating Repts for May 1999 for Byron Station,Units 1 & 2.With A99019, Monthly Operating Repts for May 1999 for Zion Nuclear Power Station,Units 1 & 2.With1999-05-31031 May 1999 Monthly Operating Repts for May 1999 for Zion Nuclear Power Station,Units 1 & 2.With ML20209H7481999-05-31031 May 1999 Revised Monthly Operating Repts for May 1999 for Braidwood Station,Units 1 & 2 BW990029, Monthly Operating Repts for May 1999 for Braidwood Stations, Units 1 & 2.With1999-05-31031 May 1999 Monthly Operating Repts for May 1999 for Braidwood Stations, Units 1 & 2.With ML20207B6481999-05-25025 May 1999 SER Accepting Revised SGTR Analysis for Byron & Braidwood Stations.Revised Analysis Was Submitted to Support SG Replacement at Unit 1 of Each Station ML20195B2591999-05-19019 May 1999 Rev 66a to CE-1-A,consisting of Proposed Changes to QAP for Dnps,Qcs,Znps,Lcs,Byron & Braidwood Stations A99016, Monthly Operating Repts for Apr 1999 for Zion Nuclear Power Station,Units 1 & 2.With1999-04-30030 April 1999 Monthly Operating Repts for Apr 1999 for Zion Nuclear Power Station,Units 1 & 2.With ML20206R6991999-04-30030 April 1999 Monthly Operating Repts for Apr 1999 for Byron Station Units 1 & 2.With BW990021, Monthly Operating Repts for Apr 1999 for Braidwood Station, Units 1 & 2.With1999-04-30030 April 1999 Monthly Operating Repts for Apr 1999 for Braidwood Station, Units 1 & 2.With ML20195H9521999-04-30030 April 1999 Revised Monthly Operating Repts for Apr 1999 for Zion Nuclear Power Station,Units 1 & 2 ML20195C7961999-04-28028 April 1999 Rev 2 to NFM9800233, Byron Station Unit 2 COLR for Cycle 8A (BY2C8A) M980023, Rev 2 to NFM9800233, Byron Station Unit 2 COLR for Cycle 8A (BY2C8A)1999-04-28028 April 1999 Rev 2 to NFM9800233, Byron Station Unit 2 COLR for Cycle 8A (BY2C8A) ML20205P7001999-03-31031 March 1999 Monthly Operating Repts for Mar 1999 for Byron Station,Units 1 & 2.With A99013, Monthly Operating Repts for Mar 1999 for Zion Nuclear Power Station,Units 1 & 2.With1999-03-31031 March 1999 Monthly Operating Repts for Mar 1999 for Zion Nuclear Power Station,Units 1 & 2.With BW990016, Monthly Operating Repts for Mar 1999 for Braidwood Generating Station,Units 1 & 2.With1999-03-31031 March 1999 Monthly Operating Repts for Mar 1999 for Braidwood Generating Station,Units 1 & 2.With ML20205B5091999-03-26026 March 1999 SER Accepting Relief Requests 12R-24,Rev 0 & 12R-34,Rev 0, Related to Second 10-year Interval Inservice Insp for Byron Station,Units 1 & 2 ML20205C5101999-03-21021 March 1999 Revised Safety Evaluation Supporting Improved TS Amends Issued by NRC on 981222 to FOLs NPF-37,NPF-66,NPF-72 & NPF-77.Revised Pages Include Editorial Corrections ML20204G3831999-03-19019 March 1999 Safety Evaluation Accepting Second 10-yr Interval ISI Request for Relief 12R-11 M990004, Rev 0 to NFM9900043, Byron Unit 1,Cycle 10 COLR in ITS Format W(Z) Function1999-03-17017 March 1999 Rev 0 to NFM9900043, Byron Unit 1,Cycle 10 COLR in ITS Format W(Z) Function 1999-09-30
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POWER REACTOR EVENT NUMBER: 31890 1
i FACILITY: BYRON REGION: 3 NOTIFICATION DATE: 03/04/97 j UNIT: [1] [2] [] STATE: IL NOTIFICATION TIME: 16:22 [ET)
RX TYPE: [1] W-4 -LP, [2] W-4-LP EVENT DATE: 03/03/97 EVENT TIME: 00:00(CST)
I NRC NOTIFIED BY: PAUL WENC LAST UPDATE DATE: 03/04/97 HQ OPS OFFICER: HENRY BAILEY NOTIFICATIONS EMERGENCY CLASS: NOT APPLICABLE 10 CFR SECTION:
CCCC 21.21 UNSPECIFIED PARAGRAPH VERNON HODGE, RVIB NRR UNIT SCRAM CODE RX CRIT INIT PWR INIT RX MODE CURR PWR CURR RX MODE 1 N N O HOT SHUTDOWN 0 HOT SHUTDOWN ~
2 N Y 100 POWER OPERATION 100 POWER CPERATION EVENT TEXT 10 CFR PART 21 NOTIFICATION - CRACKING OF VITEC TRANSFORMER CORES THESE TRANSFORMERS ARE INSTALLED IN VARIOUS SAFETY-RELATED CIRCUITS BOARDS.
TEMPERATURE CHANGES IN THESE CIRCUIT BOARDS COULD CAUSE ASSOCIATED INSTRUMENTATION ~!O DRIFT OUT OF RANGE. THE SAFETY-RELATED APPLICATIONS WHERE THIS TRANSFORMER HAS THE MOST POTENTIAL IMPACT ARE THE DELTA TEMPERATURE PROTECTION FUNCTIONS (NRA CARDS) IN THE REACTOR PROTECTION SYSTEM (RPS). THE DRIFT IN THE RPS COULD CAUSE A CHANNEL TO TRIP RESULTING l 1
IN A LOSS OF REDUNDANCY IN THE DIVERSE TRIP FUNCTION. i NOTE: THIS ISSUE ALSO APPLIES TO BRAIDWOOD UNITS 1 AND 2 AND TO ZION UNITS 1 AND 2.
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Commonwesten tsawi refopany ggl 9ejjyf eyenn Cenerating !uscors 44HI North German ChmL A4ad O,- flyroa. lL 610149794 Tea a15.234444i March 3,1997 LTR: BYRON 97 5045 HLE- 2.01.0703 U. S. Nuclear Regulatory Commission Washington,DC 20555
- l Attention: Document ControlDoak
Subject:
Byron Station Units 1 and 2 Braidwood StationUnits 1 and 2 Zion Station Units 1 and 2 10 CFRPart 21 Noti 6 cation Crackingof VITEC Transfonnors NRC Dockets 50-454 and 50455 '
NRC Dockets 50-456 and 50-457 NRC Dockets 50-295 and 50-304
Reference:
"Transfonner Crackmg", Westinghouse Potential Issue NS AL-96 006, dated De=M 26,1996.
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l This notiBcation is submitted in accordance with the requirements of 10 CFR Part 21, Section 21.21(a),21.3a(3), and 21.3d(l). .
Idsntification of Fari1Mn and Cem,anents Byron Nuclear Generating Station Units 1 and 2 Braidwood Nuclear Generating Station Units 1 and 2 Zion Nuclear Generatin8 Station Units 1 and 2 l
l 7300 Process Protection System Integrated Circuit Cards (h% NLP, NSC, NLL, i
NMD,NCH, NVP, am!NSA applications) i NRA card model #: 2837A15001, various date codes supplied by Westinghouse kom October 1991 through 1993.
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! During innentiatian and testag of the RTD By-Pass =ndificarian at Braidwood Station !
a output driR was observed with increasing temperature on several RID angdidor (NRA) cards Investigation revealed that it appeared to be a problem ==aalaw with a new revision of this model circuit card. The vendor (Westinghouse) was ihrmally nouSed and seven (7) examples of the suspect cards were sent by ConiEd to i Westinghouse for evahastion.
4 A Nuclear Safety Advisory Letter (NSAL) noti 8 cation from Westinghouse was ,
provided to potentinDy adEscted liosasses on December 26,1996 (reference).
3 i
WsM= determined that the drit on these cards ranged flrom 140 mV to 1.76 l ,
volts (10 volt span) after several minutes at exposures to temperatures of1407.
' Westinghouse traced the y.J.S;a to a transformer that isolates the input and output l
i stages of the NRA card. M::;1My, Westinghouse returned the suspect transformers to the vendor eens which they were supplied. 'Ilie vendor, VITEC, j 1
determined that the core of the transformers had been arsobed during the l manufheturing process, and that an increased temperature could cause tbs i=dna=e*
to decrease resulting in a change in the output of the card. Westingbouse did indicate l that any driR in the cards would be detectable when the cards were instaued and
!' calibrated in the ranks aAer preliminary calibration on an outender eerd. The j temperature in the racks is estimated to be 100 - 110 T.
I I 1 Westinghouse determined that the potentially defective transformers are used on seven l
other 7300 cards. The cause of the defect in the transformer is believed to b excessive tightening of the screw that holds the core together prior to potting the assembly during the manufheturing process VITEC has been the supplier of these l transformers since late 1991. However, VITEC made a change to nylon screws in i 1994 and subsequent testing of these new transibrmers has demonstrated that the problem does not exist fbr the newer cards.
i i Tuna afDiscovery 1
Comed determined that the failure was a potential defect subject to the provisions of 10CFR21 on January 7,1997. Final determination that the defbet was reportable per l 10CFR21 was made on March 3,1997.
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Nr - ' -l f_e=d= af AH F 'Mun C .-;- -v Zion Station has not idemined any instaBations of the suspect circuit cards at Zion.
The population of potendany asected cards at Byron and Braidwood Stations is j
estensive due to the number of circuit card applications that have been identiSed by W ='--d - The exact number of potentiauy delbetive components is not currently available due to the uncertaisy ofwhich date codes are actually instaDed in the plant l Comed has deterunned that the applications of concem Dom a 10CFR21 standpoint are the NRA, NLP, and NSC cards. This is due to tbs isolated output ihnetionfor th spplications serviced by these specific cards l ;
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- i Byron and Braidwood Stations have initiated actions to identify all circuit card the affected date codes Once the population offmpacted cards is fully idamified, th j affected cards will be replaced, where appropriate. Westinghouse indicated that it is l unhkaly that many trana6mners with cracked cores asist. In addition, it has be
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determined that an instaHad cards are located in rooms that are supplied by safety related, redundant HVAC systems that are designed to snaintain appropriate temperatures. The safety related applications where this transformer issue h i most potentialimpact are the AT protection functions (NRA cards) because ofrl l
trip concerns These applications are subjected to y#adic channel checks an l reasonable to assume that any signi5 cant non-conservative calibration drtit would b detectable during channel checking activities. Both Byron and Braidwood Stations j ,
have documented W.Miity assessments that conclude that there is reasonable
{ assurance of operabGity fbr the potentially affected applications. Completion of i
inspection and/or replacement of the l'a:=eW population ofcircuit cards for bo
' Byron and Braidwood Stations wiD be completed prior to the and of the nex ,
outage on each unit.
Byron and Braidwood Stations have inspected all spare circuit cards in Stores to ensure that no additional potentinny affected components are placed into service.
j 2
10 CFR 21 Ev=b= dan 4
?
The safety related applications where this transforrner issue has the most po l
impact are the 4T protection functens (NRA cards), There is some potential l ;
defective cards would not be detected during installation and initial calibration. A negative drift in the estibration of detective cards could result in nona:enservat
, &f adaan fbr both AT and the corresponding setpoissa This could result in a lack l of redundant reactor trip fbaction. Thersibre, Comed has d-'=daad that the l ,
identined delbct does represent a subseanrfal sqfety harauf per the requirements of l 10CFR21 and is reportableto the NRC.
i l 1 I
' p%mhydvemeef 3045Am 3
NRC OPS CTR H00 @ 003 ~ ~~ ~ ;
04/10/97 12:5s C301818 6151 11:T4 HRC4 301 016 0151 NO.396 906 l p4/10/97 5,
. l Cantacts
, l Questions pertaining to this notification 1.hould be addressed to either e
Bradley1 Adarna PeterI. Wicyk !
EIAC Engineering !
Site Engineenns Comed Byron Station Comed NES, ETW III l 4450 N. Gennan Church head 1400 Opus Place Byron, Illinois 61010 DownersGrove Blinois 60515 !
(815) 234-5441 x2979 (630) 663 7264 I
l Sincerely, b !
[K. L.
SiteOrmesser VicePresident ,
Byron Nuclear Station l
ec: A. B. Beach, Regional Administrator RIII j S. Burgess, Senior Resident laspector (Byron)
C. PhiHips, Senior Resident Inspector (Braidwood) 1 A. Vogel, Senior Resident Inspector (Zion) 6 R Assa-NRR C. Shiraki-NRR Office of Nuclear Facility Safety - IDNS DCD - Licensing, Suite 400, Downer Grove l
- weynemyai. soc.en 4
.