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Category:DEFICIENCY REPORTS (PER 10CFR50.55E & PART 21)
MONTHYEARML20126D7211992-12-16016 December 1992 Potential Part 21 Rept Re Actual Performance of Rosemount Supplied Bailey Bq Differential Pressure Transmitters Differing from Rosemount Original Spec.Bailey Controls Encl.Evaluation Not Yet Performed ML20154J4101988-05-12012 May 1988 Addendum 1 to Supplemental Part 21 Rept 145 Re Potential Problem w/F-573-156 Pressure Sensor/Lube Oil Trip.Initially Reported on 880429.Addl 1-1/8-inch Diameter W/Deep Counterbone in Pressure Head Added to Activate Valve ML20153B6191988-04-29029 April 1988 Part 21 Rept Re Potential Defect in Component of Dsr or Dsrv Standby Diesel Generators Supplied to Utils.Recommends Return of Subj Components in Onsite Warehouse Storage & Suggests Surveillance of Devices Already Installed ML20215G2441987-06-16016 June 1987 Part 21 Rept Re Failure of Load Sequencing Equipment Supplied in Aug 1977 During Scheduled Testing.Caused by Open Electrical Connection on One Crimp Lug.Since 1978,insulated Lugs Used on All Equipment ML20216E4721987-05-28028 May 1987 Part 21 Rept 140 Re Potential Defect in Air Pressure Regulators Mfg by Bellofram.Dripwell Gasket May Fail Due to Mismachining of Gasket Seating Surface Causing Loss of Control Air & Starting Air Pressure 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 ML20205F6141986-08-13013 August 1986 Part 21 Rept Re Connecting Rod Bolts for Dsrv Engines.Listed Procedures Recommended for Next Connecting Rod Insp, Including Replacement of Bolts Due to Cracked Threads & Large Grooves & Galls in Threads ML20206U0591986-07-0202 July 1986 Part 21 Rept Re Potential Defect in Component of Dsrv Standby Diesel Generators,Involving Problem W/Fastening of Engine Connecting Rod Assembly Which Could Result in Engine Nonavailability.Procedure Will Be Issued by 860718 ML20197H2581986-05-0808 May 1986 Part 21 Rept 135 Re Defect W/Lube Oil Sump Tank Foot Valve of Standby Diesel Generator.Caused by Extrusion of Liner Matl Due to Overpressurization.Corrective Actions Being Developed.List of Affected Sites Modified ML20205N6811986-04-14014 April 1986 Final Part 21 & Deficiency Rept 86-03 Re Consolidated Pipe & Valve Supply,Inc Certified Matl Test Repts.Initially Reported on 860321.Six raised-face Orifice Flanges Statused & Segregated Per QA Procedures ML20205N7381986-04-14014 April 1986 Interim Deficiency & Part 21 Rept 86-02 1 Re Elastomer Liner in Clear Flow Co Foot Valves Used in Lube Oil Sump Tanks of Tdi Diesel Generators.Initially Reported on 860321. Action Will Not Be Pursued Unless Facility Reactivated ML20140H5991986-03-24024 March 1986 Second Interim Deficiency Rept 86-01 Re Error in Bechtel Computer Analysis Program.Initially Reported on 860121.No Corrective Actions Will Be Pursued & No Further Repts Will Be Submitted Unless Project Reactivated ML20154N3431986-03-10010 March 1986 Initial Part 21 Rept 135 Re Potential Problem W/Lube Oil Sump Tank Foot Valve of Dsrv Standby Diesel Generator for Facilities.Cause Not Determined.Recommends Utils Inspect Condition of Foot Valve Liners & Notify Tdi of Findings ML20153F5391986-02-14014 February 1986 Interim Part 21 & Deficiency Rept Re Error in Bechtel Computer Analysis Program ME101.Initially Reported on 860121.No Corrective Actions or Further Repts Will Be Submitted Until Project Reactivated ML20137N6101986-01-10010 January 1986 Interim Part 21 & Deficiency Rept 85-08 Re Isolated Failures of Betts Spring Co Intake & Exhaust Valve Springs Reported by Tdi.Initially Reported on 851218.Corrective Actions Will Be Pursued If Units Reactivated ML20198C4981985-11-0606 November 1985 Part 21 Rept Re Potential Defect in Dsr or Dsrv Standby Diesel Generator Intake & Exhaust Valve Springs Mfg by Betts Spring Co.Users Recommended to Inspect Engines for Broken Springs & Identify Original Mfg ML20138B9531985-10-0909 October 1985 Interim Deficiency Rept Re Larger than Anticipated Util Movement Where Freezewall Crossed safety-related Utils at Monitoring Pits 1,2,3 & 4.Initially Reported on 850917.No Action Will Be Taken ML20138C3251985-10-0808 October 1985 Interim Deficiency Rept Re Loose Set Screws on Anchor Darling Swing Check Valves & Disc Nut Pin Problems Causing Inoperability.Initially Reported on 850912.No Further Corrective Action Will Be Taken Unless Facility Reactivated ML20138C3111985-10-0808 October 1985 Interim Deficiency Rept Re Limitorque motor-operated Butterfly Valves Not Opening Electrically After Closed Manually.Initially Reported on 850912.No Corrective Actions Will Be Taken Unless Facility Reactivated ML20132B0261985-09-0303 September 1985 Part 21 Rept Re Possibility of Engine Ingestion of Unwelded Part in American Air Filter Standby Diesel Generator Intake Silencer.Immediate Hold Should Be Placed on Diesel Engines/Intake Silencers Not Yet in Svc ML20132D3191985-07-10010 July 1985 Interim Part 21 & Deficiency Rept Re Rupture During Testing by Wj Woolley Co of Inflatable Seal,Mfg by Presray Corp,Used in Personnel Air Locks in Reactor Containment Sys.Initially Reported on 850614 ML20129G0601985-04-26026 April 1985 Interim Deficiency Rept Re Potential for Cracking of Check Valves in on-engine Mounted Starting Air Piping of Tdi Diesel Generators.Initially Reported on 850401.Cause Not Determined.No Corrective Actions.Related Correspondence ML20112J3951985-03-22022 March 1985 Interim Part 21 & Deficiency Rept Re Failure of Gulf & Western MSIV Actuator Latch Roller Bearing.Matter Will Not Be Pursued Unless Plants Reactivated ML20114D3571984-12-21021 December 1984 Interim Deficiency Rept Re Diesel Fuel Oil Tank Soils Borings.Initially Reported on 841121.No Corrective Actions Necessary Due to Present Project Shutdown ML20100K9791984-11-27027 November 1984 Part 21 & Interim Deficiency Rept Re Ruskin Mfg Co Interlocking Blade Fire Dampers.Initially Reported on 841121.Corrective Action Will Not Be Pursued & No Further Repts Will Be Made Unless Plant Reactivated ML20100D9841984-11-21021 November 1984 Deficiency Rept Re Diesel Fuel Oil Tank Boring Logs.Util Response to Dow Chemical Co 841113 Request for Admissions Encl ML20100E4451984-11-15015 November 1984 Interim Deficiency Rept Re Cardinal Industrial Products Corp Spare Studs Received W/O Ultrasonic Exam.Initially Reported on 841010.Corrective Actions Will Not Be Pursued Unless Midland Reactivated ML20100E2371984-11-15015 November 1984 Interim Part 21 & Deficiency Rept Re Tdi Fuel Control Level Cap Screws.Initially Reported on 841010.No Corrective Actions Will Be Pursued & No Further Repts on Subj Made Unless Midland Reactivated ML20100E2621984-11-15015 November 1984 Interim Part 21 & Deficiency Rept Re Rosemount 1153 Series B Transmitters Potentially Leaking.Initially Reported on 841010.Four Units Shipped to Facilities.Corrective Actions Will Not Be Pursued ML20099E3531984-11-0909 November 1984 Interim Deficiency Rept Re Small Bore Piping Anchor Design. Initially Reported on 840816.Listed Corrective Actions Will Not Be Pursued & No Further Repts Will Be Made Unless Facilities Reactivated ML20093H8521984-08-0202 August 1984 Interim Deficiency Rept Re Field Installation of Itt Grinnell Struts & Extension Pieces.Initially Reported on 840705.No Activity Being Currently Pursued.No Further Repts Will Be Made Unless Facilities Reactivated ML20093H3961984-08-0202 August 1984 Interim Deficiency Rept Re Seismic Qualification of Power Supplies for Eccas & Ni/Rps Equipment.Initially Reported on 840705.No Activity Being Currently Pursued.No Further Repts Will Be Made Unless Facilities Reactivated ML20096A7781984-07-27027 July 1984 Final Deficiency Rept Re Defective Capstan Springs in Pacific Scientific Mechanical Shock Arrestors.Initially Reported on 840106.W/o Description of Investigation & Corrective Actions.Related Correspondence ML20093H8111984-07-27027 July 1984 Final Part 21 & Deficiency Rept Re Capstan Springs in Mechanical Shock Arrestors Supplied by Pacific Scientific. All Suspect Shock Arrestor Capstan Springs Will Be Inspected for Cracks & Defective Springs Replaced ML20093H8871984-07-20020 July 1984 Interim Deficiency Rept Re Reactor Coolant Pump Seals & Seal Covers.Initially Reported on 840622.No Activity Currently Being Pursued.No Further Repts Will Be Made Unless Facilities Reactivated ML20093H4751984-07-17017 July 1984 Interim Deficiency Rept Re Core Flood Line Piping Supports in Reactor Pressure Vessel Connection Supplied by Bechtel. Overstressing Could Occur in Pipe Supports.No Commitment Made for Further Repts ML20096A2951984-07-11011 July 1984 Final Deficiency Rept Re Concrete Embedment Design Using Shear Lugs Located Outside Compression Zone.Initially Reported on 821203.Use of Shear Lugs Outside Compression Zone Is Proper Design Technique.Related Correspondence ML20093G7891984-07-11011 July 1984 Final Deficiency Rept Re Concrete Embedment Design Using Shear Lugs Located Outside Compression Zone.No Corrective Action Required.Not Reportable Under 10CFR50.55(e) ML20093D1511984-07-0909 July 1984 Final Deficiency Rept Re Excessive Wear to Pacific Air Products Linear Converter Shaft Guides.Initially Reported on 840228.Vendor Drawings Reviewed to Ensure All safety-related Dampers Identified ML20093F7131984-07-0606 July 1984 Interim Deficiency Rept Re Differential Settlement Between Diesel Generator Structure & Pedestal.Svc Water Piping Modified,Investigation of Similar Conditions Completed & Personnel Retrained.Next Rept Expected by 840928 ML20093F8311984-06-30030 June 1984 Final Deficiency Rept Re Attachment of non-q/non-seismic Piping to Component Water Sys.Initially Reported on 831216. Investigation Completed.Training Session Held to Reinstruct Design Stress Group on Total Loads ML20093E1431984-06-29029 June 1984 Interim Deficiency Rept Re delivered,safety-related Itt General Controls Electrical Equipment Not Meeting Project Requirements.Evaluation Underway.Interim or Final Rept Expected by 841231 ML20093D2041984-06-29029 June 1984 Interim Deficiency Rept Re Sys for Processing Field Changes for Project Design Documents.Program Initiated for Document Review,Audit Performed & Interface Procedure Implemented. Next Rept Will Be Submitted by 841231 ML20090C8381984-06-29029 June 1984 Interim Deficiency Rept Re Reactor Bldg Spray Piping Supports.All Engineering Corrective Actions Complete.Matl Required for Repairs Procured.Next Rept Will Be Submitted by 850125 ML20092K6121984-06-15015 June 1984 Interim Deficiency Rept Re Control of Retroactive Design Changes.Initially Reported on 840518.Investigation Continuing.Next Rept Will Be Provided by 841130 ML20091R5751984-06-0808 June 1984 Interim Deficiency Rept Re Electrical Raceway Sys Nonconformances.Initially Reported on 830829.Util Evaluating Results from Const Completion Program & Reviewing Bechtel Followup to Mcar 70.Next Rept by 841130 ML20091L5761984-06-0101 June 1984 Interim Deficiency Rept Re B&W Steam Generator Auxiliary Feedwater Header Design Change.Initially Reported on 820526. No Schedule Established for Design Change & Mod of Hardware. Next Rept Will Be Issued on or Before 841130 ML20091Q9511984-06-0101 June 1984 Interim Deficiency Rept Re Use of Shear Lugs in Embedment Design.Bechtel Investigations Indicated Use of Shear Lugs Outside Compression Zone Effective Design Technique & That No Safety Concerns Exist.Next Rept Expected by 840928 ML20091L7811984-06-0101 June 1984 Interim Deficiency Rept Re Small Break/Reactor Coolant Pump Operation Interaction During Primary Sys High Void Fraction Conditions.Investigation Incomplete.Next Rept Will Be Submitted by 840831 1992-12-16
[Table view] Category:TEXT-SAFETY REPORT
MONTHYEARML20058L8721992-12-31031 December 1992 1992 Annual Rept,Cpc ML20126D7211992-12-16016 December 1992 Potential Part 21 Rept Re Actual Performance of Rosemount Supplied Bailey Bq Differential Pressure Transmitters Differing from Rosemount Original Spec.Bailey Controls Encl.Evaluation Not Yet Performed ML20246N1221988-12-31031 December 1988 CMS Energy 1988 Annual Rept ML20154J4101988-05-12012 May 1988 Addendum 1 to Supplemental Part 21 Rept 145 Re Potential Problem w/F-573-156 Pressure Sensor/Lube Oil Trip.Initially Reported on 880429.Addl 1-1/8-inch Diameter W/Deep Counterbone in Pressure Head Added to Activate Valve ML20153B6191988-04-29029 April 1988 Part 21 Rept Re Potential Defect in Component of Dsr or Dsrv Standby Diesel Generators Supplied to Utils.Recommends Return of Subj Components in Onsite Warehouse Storage & Suggests Surveillance of Devices Already Installed ML20196J3801987-12-31031 December 1987 CMS Energy Corp 1987 Annual Rept ML20215G2441987-06-16016 June 1987 Part 21 Rept Re Failure of Load Sequencing Equipment Supplied in Aug 1977 During Scheduled Testing.Caused by Open Electrical Connection on One Crimp Lug.Since 1978,insulated Lugs Used on All Equipment ML20216E4721987-05-28028 May 1987 Part 21 Rept 140 Re Potential Defect in Air Pressure Regulators Mfg by Bellofram.Dripwell Gasket May Fail Due to Mismachining of Gasket Seating Surface Causing Loss of Control Air & Starting Air Pressure ML20207R9041986-12-31031 December 1986 CPC 1986 Annual Rept ML20214A0951986-11-14014 November 1986 Insp & Evaluation Re Adequacy of Stabilization Plan,In Response to Util 860701 Request for Withdrawal of Applications to Extend CP & Util Motions Seeking Withdrawal of OL Application 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 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 ML20205F6141986-08-13013 August 1986 Part 21 Rept Re Connecting Rod Bolts for Dsrv Engines.Listed Procedures Recommended for Next Connecting Rod Insp, Including Replacement of Bolts Due to Cracked Threads & Large Grooves & Galls in Threads ML20206U0591986-07-0202 July 1986 Part 21 Rept Re Potential Defect in Component of Dsrv Standby Diesel Generators,Involving Problem W/Fastening of Engine Connecting Rod Assembly Which Could Result in Engine Nonavailability.Procedure Will Be Issued by 860718 ML20197H2581986-05-0808 May 1986 Part 21 Rept 135 Re Defect W/Lube Oil Sump Tank Foot Valve of Standby Diesel Generator.Caused by Extrusion of Liner Matl Due to Overpressurization.Corrective Actions Being Developed.List of Affected Sites Modified ML20203N4171986-04-30030 April 1986 Rev 2 to Tdi Owners Group App Ii:Generic Maint Matrix & Justifications ML20205N6811986-04-14014 April 1986 Final Part 21 & Deficiency Rept 86-03 Re Consolidated Pipe & Valve Supply,Inc Certified Matl Test Repts.Initially Reported on 860321.Six raised-face Orifice Flanges Statused & Segregated Per QA Procedures ML20205N7381986-04-14014 April 1986 Interim Deficiency & Part 21 Rept 86-02 1 Re Elastomer Liner in Clear Flow Co Foot Valves Used in Lube Oil Sump Tanks of Tdi Diesel Generators.Initially Reported on 860321. Action Will Not Be Pursued Unless Facility Reactivated ML20140H5991986-03-24024 March 1986 Second Interim Deficiency Rept 86-01 Re Error in Bechtel Computer Analysis Program.Initially Reported on 860121.No Corrective Actions Will Be Pursued & No Further Repts Will Be Submitted Unless Project Reactivated ML20154N3431986-03-10010 March 1986 Initial Part 21 Rept 135 Re Potential Problem W/Lube Oil Sump Tank Foot Valve of Dsrv Standby Diesel Generator for Facilities.Cause Not Determined.Recommends Utils Inspect Condition of Foot Valve Liners & Notify Tdi of Findings ML20153F5391986-02-14014 February 1986 Interim Part 21 & Deficiency Rept Re Error in Bechtel Computer Analysis Program ME101.Initially Reported on 860121.No Corrective Actions or Further Repts Will Be Submitted Until Project Reactivated ML20137N6101986-01-10010 January 1986 Interim Part 21 & Deficiency Rept 85-08 Re Isolated Failures of Betts Spring Co Intake & Exhaust Valve Springs Reported by Tdi.Initially Reported on 851218.Corrective Actions Will Be Pursued If Units Reactivated ML20141N8361985-12-31031 December 1985 CPC 1985 Annual Rept ML20138M3891985-12-12012 December 1985 Topical Rept Evaluation of Rev 1 to BAW-1847, Leak Before Break Evaluation of Margins Against Full Break for Rcs.... Rept Presents Acceptable Justification to Eliminate Dynamic Effects of Large Ruptures in Piping ML20198C4981985-11-0606 November 1985 Part 21 Rept Re Potential Defect in Dsr or Dsrv Standby Diesel Generator Intake & Exhaust Valve Springs Mfg by Betts Spring Co.Users Recommended to Inspect Engines for Broken Springs & Identify Original Mfg ML20138B9531985-10-0909 October 1985 Interim Deficiency Rept Re Larger than Anticipated Util Movement Where Freezewall Crossed safety-related Utils at Monitoring Pits 1,2,3 & 4.Initially Reported on 850917.No Action Will Be Taken ML20138C3111985-10-0808 October 1985 Interim Deficiency Rept Re Limitorque motor-operated Butterfly Valves Not Opening Electrically After Closed Manually.Initially Reported on 850912.No Corrective Actions Will Be Taken Unless Facility Reactivated ML20138C3251985-10-0808 October 1985 Interim Deficiency Rept Re Loose Set Screws on Anchor Darling Swing Check Valves & Disc Nut Pin Problems Causing Inoperability.Initially Reported on 850912.No Further Corrective Action Will Be Taken Unless Facility Reactivated ML20132B0261985-09-0303 September 1985 Part 21 Rept Re Possibility of Engine Ingestion of Unwelded Part in American Air Filter Standby Diesel Generator Intake Silencer.Immediate Hold Should Be Placed on Diesel Engines/Intake Silencers Not Yet in Svc ML20132D3191985-07-10010 July 1985 Interim Part 21 & Deficiency Rept Re Rupture During Testing by Wj Woolley Co of Inflatable Seal,Mfg by Presray Corp,Used in Personnel Air Locks in Reactor Containment Sys.Initially Reported on 850614 ML20129G0601985-04-26026 April 1985 Interim Deficiency Rept Re Potential for Cracking of Check Valves in on-engine Mounted Starting Air Piping of Tdi Diesel Generators.Initially Reported on 850401.Cause Not Determined.No Corrective Actions.Related Correspondence ML20112J3951985-03-22022 March 1985 Interim Part 21 & Deficiency Rept Re Failure of Gulf & Western MSIV Actuator Latch Roller Bearing.Matter Will Not Be Pursued Unless Plants Reactivated ML20100B6361985-01-21021 January 1985 Rept on Welding Allegations ML20114D3571984-12-21021 December 1984 Interim Deficiency Rept Re Diesel Fuel Oil Tank Soils Borings.Initially Reported on 841121.No Corrective Actions Necessary Due to Present Project Shutdown ML20100K9791984-11-27027 November 1984 Part 21 & Interim Deficiency Rept Re Ruskin Mfg Co Interlocking Blade Fire Dampers.Initially Reported on 841121.Corrective Action Will Not Be Pursued & No Further Repts Will Be Made Unless Plant Reactivated ML20100D9841984-11-21021 November 1984 Deficiency Rept Re Diesel Fuel Oil Tank Boring Logs.Util Response to Dow Chemical Co 841113 Request for Admissions Encl ML20100E4451984-11-15015 November 1984 Interim Deficiency Rept Re Cardinal Industrial Products Corp Spare Studs Received W/O Ultrasonic Exam.Initially Reported on 841010.Corrective Actions Will Not Be Pursued Unless Midland Reactivated ML20100E2621984-11-15015 November 1984 Interim Part 21 & Deficiency Rept Re Rosemount 1153 Series B Transmitters Potentially Leaking.Initially Reported on 841010.Four Units Shipped to Facilities.Corrective Actions Will Not Be Pursued ML20100E2371984-11-15015 November 1984 Interim Part 21 & Deficiency Rept Re Tdi Fuel Control Level Cap Screws.Initially Reported on 841010.No Corrective Actions Will Be Pursued & No Further Repts on Subj Made Unless Midland Reactivated ML20099E3531984-11-0909 November 1984 Interim Deficiency Rept Re Small Bore Piping Anchor Design. Initially Reported on 840816.Listed Corrective Actions Will Not Be Pursued & No Further Repts Will Be Made Unless Facilities Reactivated ML20093C3211984-10-0101 October 1984 Rev 0 to QA Program Plan for Shutdown Phase ML20093H3961984-08-0202 August 1984 Interim Deficiency Rept Re Seismic Qualification of Power Supplies for Eccas & Ni/Rps Equipment.Initially Reported on 840705.No Activity Being Currently Pursued.No Further Repts Will Be Made Unless Facilities Reactivated ML20093H8521984-08-0202 August 1984 Interim Deficiency Rept Re Field Installation of Itt Grinnell Struts & Extension Pieces.Initially Reported on 840705.No Activity Being Currently Pursued.No Further Repts Will Be Made Unless Facilities Reactivated ML20096A7781984-07-27027 July 1984 Final Deficiency Rept Re Defective Capstan Springs in Pacific Scientific Mechanical Shock Arrestors.Initially Reported on 840106.W/o Description of Investigation & Corrective Actions.Related Correspondence ML20093H8111984-07-27027 July 1984 Final Part 21 & Deficiency Rept Re Capstan Springs in Mechanical Shock Arrestors Supplied by Pacific Scientific. All Suspect Shock Arrestor Capstan Springs Will Be Inspected for Cracks & Defective Springs Replaced ML20093H8871984-07-20020 July 1984 Interim Deficiency Rept Re Reactor Coolant Pump Seals & Seal Covers.Initially Reported on 840622.No Activity Currently Being Pursued.No Further Repts Will Be Made Unless Facilities Reactivated ML20090G2141984-07-18018 July 1984 Idcvp:Control Room HVAC Sys Performance Requirements, Draft Topical Rept ML20093H4751984-07-17017 July 1984 Interim Deficiency Rept Re Core Flood Line Piping Supports in Reactor Pressure Vessel Connection Supplied by Bechtel. Overstressing Could Occur in Pipe Supports.No Commitment Made for Further Repts ML20096A2951984-07-11011 July 1984 Final Deficiency Rept Re Concrete Embedment Design Using Shear Lugs Located Outside Compression Zone.Initially Reported on 821203.Use of Shear Lugs Outside Compression Zone Is Proper Design Technique.Related Correspondence ML20093G7891984-07-11011 July 1984 Final Deficiency Rept Re Concrete Embedment Design Using Shear Lugs Located Outside Compression Zone.No Corrective Action Required.Not Reportable Under 10CFR50.55(e) 1992-12-31
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- Consumers Power James W Cook Company na nsu- - n+aanzinn,i s and Construction G*aal officos: 945 West Parnall Road, Jackson, MI 49201 e (517) 788-0453 81-03 #13 April 23, 1982 s x. r o, _. / /\,
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,y' NQ Mr J G Keppler, Regional Administrator
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Office of Nuclear Reactor Regulation x! ia' i US Nuclear Regulatory Commission Washington, DC 20555 MIDLAND PROJECT -
DOCKET HOS 50-329 AND 50-330 BORATED WATER STORAGE TANK FOUNDATION OL DESIGN CALCULATIONS FILE: Oh85 16, 0.4.9.h9 SERIAL: 16172
References:
J W Cook letters to J G Keppler:
(1) Serial 11201, dated February 20, 1981 (2) Serial 11528, dated April 3,1981 (3) Serial 12015, dated June 12, 1981 (h) Serial 12799, dated June 26, 1981 (5) Serial 13352, dated July 21, 1981 (6) Serial 13653, dated August 28, 1981 (7) Serial 14591, dated October 26, 1981 (8) Serial lh339, dated November 13, 1981 (o) Serial lh902, dated November 2h, 1981 (10) Serial 146h5, dated December 11, 1981 (11) Serial lh66h, dated January 18, 1982 (12) Serial 16127, dated March 15, 1982 This letter, as were the referenced letters, is an interim 50 55(e) report concerning the existence of cracks in the borated water storage tank foundation.
Attachment 1 provides a report of the analyses and corrective actions that have been or vill be taken as a result of the deficiency identified with these cracks.
Another report , either interim or final, vill be sent on or before July 2,1982.
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. Attachment 1 Serial 16172 81-03 #13 Bechtel Associates Professional Corporation U67174 067259
SUBJECT:
MCAR 48 (issued 1/29/81)
The Existence of Cracks in the Borated Water Storage Tank Foundation - Units 1 and 2 FINAL REPORT DATE: April 20,1982 PROJECT: Consumers Power Company Midland Plant Units 1 and 2 Bechtel Job 7220 Introduction This report addresses the existence of cracks in the borated water storage tank (BWST) foundations as described in 11 CAR 48 and three subsequent interim reports. This report is a final statement on the investigative analyses and all corrective actions that have been or will be taken as a result of the deficiency identified with these cracks.
Description of Deficiency The 52-foot diameter, stainless steel BWSTs are 32 feet high and rest on a reinforced concrete ring wall and compacted, granular backfill material contained within the ring wall. On one side is an integral valve pit that houses connections and valves for the two 18-inch diameter pipelines that service each tank. Figure BWST-1 from the Atomic Safety and Licensing Board (ASLB) llearing Testimony of Alan J. Boos and Dr. Robert llanson regarding remedial measures for the BWST is attached for reference.
During the load test on the Unit 1 tank (conducted in compliance with the response to 10 CFR 50.54(f), Question 4), a discrepancy was noted between measurements of settlements recorded at the jobsite and the computed dis-placements derived from the structural analysis used at that time. As a result, the analysis was modified to include a finite-element model of the soil subgrade. A number of analyres were completed using various values for the modulus of elasticity (E) of the soil. The results of the analyses predicted that moments at several locations in the foundation
( structure exceed allowable moments. The foundation at these locations was j examined to verify whether visible signs of high strain in the reinforce-ment existed. Cracks.were found in the structure at those locations indicated by the analysis as having greater than allowable moments. The largest crack measured 0.063 inch. Subsequently, the Unit 2 tank founda-tion was also examined; similar cracks were found, and the largest crack measured 0.035 inch. The smaller bearing area of the Unit 2 valve pit partially explains why the cracks in the Unit 2 tank foundation are smaller than the cracks in the Unit 1 tank foundation.
.g Serial 16172 81-03 #13 Attachment 1: MCAR 48, Final Report , "The Existence of Cracks in the Borated Water Storage Tank Foundation - Units 1 and 2, dated April 20, 1982 CC: RJCook, Midland Resident Inspector Document Control Desk, NRC Washington, DC Atomic Safety & Licensing Appeal Board CBechhoefer, ASLB MMCherry, Esq FPCowan, ASLB RSDecker, ASLB DSHood, USNRC (2)
RHernan, USNRC JHarbour, ASLB JDKane, USNRC W0tto, US Army Corps of Engineers WHMarshall FRinaldi, USNRC HSingh, US Army Corps of Engineers MSinclair BStamiris SJPoulos, Geotech Eng, Inc L_ _
Bechtel Associates ProfessionalCorporation 067174 067259 MCAR 48 Final Report April 20, 1982 Page 2 Safety Implications As shown in Figure BWST-1, the tanks' outside shell is attached to the ring wall foundation by equally spaced anchor bolts that transfer induced forces from the anchor chair. Field observations indicated gaps between the anchor bolt nut and anchor chair in several locations around the periphery of the tank. In other locations, the anchor chairs were deflected, indicating high tensile stress in the bolts. This aachor bolt behavior results from the distortion of the foundation ring which is caused by differential settlement; this agrees with the conclusions of the modified structural analysis. The tension induced in the bolts is similar to the tension induced by a preload phenomenon and does not affect the ability of the bolts to resist design loads. Although the ring wall is cracked, it is capable of providing the necessary anchorage for the anchor bolts to resist tension due to externally applied forces.
The concrete ring wall confines the foundation material which is loaded by the tank; this confinement causes hoop tension in the ring wall.
Cracks equal in size to those observed in the ring wall expose the reinforcing steel to the groundwater and atmosphere. If the reinforcing steel carrying the hoop tension were to corrode significantly, the '
ability of the ring wall to resist the hoop tensio.n would be reduced.
Reduction of overall strength of the ring wall, combined with increased ,
displacements (both vertically and laterally) of the ring wall, may occur, causing stress concentrations in the tank near anchor chairs.
Based on the foregoing discussion, it is concluded that the cracking of the ring beam does not create a present safety problem for the tank.
However, it could not be conclusively shown that the safety of future plant operations would not have been affected if the deficiency had go'e uncorrected. Therefore, the condition was treated as reportable under the provisions of 10 CFR 50.55(e).
Probable Cause Review of field observations and analytical investigations leads to an understanding of the probable cause. When the tank was loaded, the bearing pressure on the tank area was increased to approximately 2 ksf greater than the valve pit area; however, this 2 ksf differential was not accounted for in the calculation for ring beam reinforcing. As a result, the valve pit restrained the tank foundation from settling uniformly, causing bending at the ring wall / valve pit junction.
Bechtel Associates Professional Corporation MCAR 48
?inal Report April 20, 1982 ,
Page 3 Corrective Action To ensure that the BWSTs function properly in the future under all design conditions, the following actions are being implemented.
- 1. A portion of the valve pit and its surrounding area has been sur-charged. Figure BWST-2 from the ASLB Hearing Testimony of A.J. Boos and Dr. R. Hanson details the surcharge program which was begun October 27, 1981, and completed March 19, 1982.
The surcharge operation has consolidated the fill beneath the valve pit, thereby reducing the amount of expected residual differential settlement of the foundation structure over the 40-year life of the plant. In addition, by reducing the differential settlement, the surcharging has reduced the ring wall distortion. However, the proposed remedial plan for the ring wall described below will not take credit for this reduced distortion, and, therefore, is con-servative.
- 2. A reinforcing ring beam will be constructed around the existing ring wall. The new ring beam is sized to resist all imposed load-ing from the tank, including additional future bending induced by the predicted residual differential settlement between the ring wall and the valve pit. Shear connectors transfer the shear force from the existing ring wall to the new ring beam. One end of the shear connectors will be installed in the existing ring wall by drilling and grouting. The other end will be cast in the new ring beam. All cracks in the existing ring wall that exceed 10 mils will be repaired by pressure grouting. The main reinforcing bars in the new ring beam that terminate at the valve pit are anchored in the roof or base slab of the valve pit by grouting them into drilled holes.
Construction of the new ring beam is scheduled to take place between May 10, 1982, and July 23, 1982.
- 3. After ring beam construction is complete, the Unit 1 tank (BWST IT-
- 60) will be releveled. The Unit 2 tank (BWST 2T-60) need not be j releved because the ring wall foundation is not severely distorted.
r A detailed procedure has been developed to define a plan of action l to relevel BWST IT-60. This procedure is supported by an analysis which demonstrates that the tank will not be overstressed during this operation. Strain gaging of the tank will be used as a backup to this analysis. A brief summary of the procedure is provided below.
Bechtel Associates Professional Corporation 067174 067259 MCAR 48 Final Report April 20, 1982 Page 4
- a. Drain and vent the tank
- b. Mount strain gages
- c. Attach 12 to 16 electromechanical jacks to the anchor bolt chairs
- d. Lift the vessel approximately 3 feet. ( All jacks will be con-trolled from a central control panel and will lift at the same
, rate and time.)
- e. Support tank with cribbing
- f. Install Celotex cofferdam around the inner diameter of the ring wall to contain grout placed in Step k below
- g. Add and contour oil-impregnated sand
- h. Clean the top surface of the ring wall
- 1. Place stainless steel shims on the original concrete ring wall. Level to a common datum plane approximately 1-1/2 inches above the ring wall. Set shims t'o the following standard:
- 1) 1/8 inch within any 30 feet of circumference
- 2) 1/4 inch over total circumference J. Remove cribbing and lower the tank
- k. Add nonshrink grout under the tank bottom to the Celotex cofferdam and allow grout to set
- 1. Remove strain gages
! m. Tighten anchor bolt nuts
, This releveling of BWST IT-60 is scheduled to begin July 19, 1982, and
(
be completed September 17, 1982. At that time, the piping will be reconnected to the tanks, the tanks will be refilled, and by December 17, 1982, the BWSTs will be in conformance with the requirements of the final safety analysis report (FSAR).
l-u
Bechtel Associates Professional Corporation U67I74 0672;._9 MCAR 48 Final Report April 20, 1982 Page 5
- 4. After the new ring beam is constructed, two observation pits will be provided for each BWST foundation at the high stress locations.
The new ring beams will be monitored monthly for possible cracks under the service condition for 6 months af ter filling the tanks.
At the end of the monitoring period, a report evaluating cracks will be submitted to the NRC. However, if during the monitoring period any cracks are noted to be 30 mils or larger, an engineering evaluation will be conducted ~ to determine whether the tank should be drained.
BWST foundation settlement will also be monitored as part of the foundation survey. Foundations are surveyed at 60-day intervals during construction and at 90-day intervals for the first year of plant operation. Subsequent survey frequency will be established after evaluating the data taken during the first year of plant operation. As a minimum, the rank foundation would be monitored annually for the next 5 years of operation and at 5 year intervals thereafter.
The critical areas of each foundation at the transition zone between the ring wall and the valve pit will be monitored using a strain gage system. This system will be monitored at the same frequency as the foundation survey using established acceptance criteria.
The construction period survey requirements are currently a part of project construction specifications (7220-C-76). The construc-tion period strain gage monitoring requirements will be incorporated into the project construction drawings of the new ring beam (7220-C-1153 and C-1154) by May 21, 1982. The long-term survey and strain gage monitoring requirements will be incorporated in the FSAR tech-nical specifications by January 1, 1983. ,
Submitted by:
ha M,j,M/i
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Approved by: e l- @*'
L.H. Curtis Pro ect ng ne ring Manager Concurrence by: '
' ~ Mt E,H. Smith
! Engineering Manager Concurrence by: b
/k M.A. Dietrich l Project Quality
- Assurance Engineer L
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