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Category:CORRESPONDENCE-LETTERS
MONTHYEARTXX-9924, Forwards Responses to Questions by NRC Re Application for Amends to Licenses NPF-87 & NPF-89,by Incorporating Changes Increasing RWST low-level Setpoint from Greater than But Equal to 40% to Greater than But Equal to 45% of Span1999-10-22022 October 1999 Forwards Responses to Questions by NRC Re Application for Amends to Licenses NPF-87 & NPF-89,by Incorporating Changes Increasing RWST low-level Setpoint from Greater than But Equal to 40% to Greater than But Equal to 45% of Span ML20217M5711999-10-20020 October 1999 Forwards Insp Repts 50-445/99-15 & 50-446/99-15 on 990822- 1002.Two Severity Level IV Violations of NRC Requirements Identified & Being Treated as non-cited Violations Consistent with App C of Enforcement Policy TXX-9923, Forwards Monthly Operating Repts for Sept 1999 for CPSES, Units 1 & 2,per Plant TS 5.6.4.No Failures of Challenges to PORVs of SV for Units Occurred1999-10-15015 October 1999 Forwards Monthly Operating Repts for Sept 1999 for CPSES, Units 1 & 2,per Plant TS 5.6.4.No Failures of Challenges to PORVs of SV for Units Occurred ML20217E7951999-10-12012 October 1999 Forwards COLR for Unit 1,Cycle 8,per TS 5.6.5 ML20212L2891999-10-0101 October 1999 Discusses Closeout of GL 97-06, Degradation of Steam Generator Internals. Purpose of GL Was to Obtain Info That Would Enable NRC to Verify That Condition of Licensee SG Internals Comply with Current Licensing Bases TXX-9922, Forwards Revised COLR, for Cycle 5 for Unit 21999-10-0101 October 1999 Forwards Revised COLR, for Cycle 5 for Unit 2 ML20216J5571999-10-0101 October 1999 Provides Final Response to GL 98-01,suppl 1, Y2K Readiness of Computer Sys at Npps ML20212G0721999-09-24024 September 1999 Forwards Rev 4 to Augmented Inservice Insp Plan for CPSES, Unit 1. Future Changes & Revs to Unit 1 Augmented Inservice Insp Plan Will Be Available on Site ML20212H0461999-09-24024 September 1999 Forwards Rev 6 to CPSES Glen Rose,Tx ASME Section XI ISI Program Plan for 1st Interval on 990820 ML20212F7481999-09-24024 September 1999 Forwards SER Authorizing Relief from Exam Requirement of 1986 Edition ASME Code,Section XI Pursuant to 10CFR50.55a(a)(3)(ii) for Relief Request A-3 & 10CFR50.55a(g)(6)(i) for Relief Requests B15,16,17 & C-4 ML20212F1041999-09-23023 September 1999 Requests That NRC Be Informed of Any Changes in Scope of Y2K System Deficiencies Listed or Util Projected Completion Schedule for Comanche Peak Steam Electric Station,Units 1 & 2 ML20212E6661999-09-21021 September 1999 Advises That Info Contained in Application & Affidavit, (CAW-99-1342) Re WCAP-15009,Rev 0, Comache Peak Unit 1 Evaluation for Tube Vibration Induced Fatigue, Will Be Withheld from Public Disclosure ML20212D9111999-09-16016 September 1999 Informs That on 990818,NRC Completed Midcycle PPR of CPSES & Did Not Identify Any Areas in Which Performance Warranted Insp Beyond Core Insp Program.Core Insp Plan at Facility Over Next 7 Months.Insp Plan Through March 2000 Encl ML20212A7601999-09-14014 September 1999 Forwards Insp Repts 50-445/99-14 & 50-446/99-14 on 990707-0821.Four Violations Occurred & Being Treated as Ncvs.Conduct of Activities Was Generally Characterized by safety-conscious Operations & Sound Radiological Controls TXX-9921, Suppls 981221 LAR 98-010 to Licenses NPF-87 & NPF-89, Clarfying Conditions of Use Re Analytical Methods Used to Determine Core Operating Limits,Per Telcon with NRC1999-09-10010 September 1999 Suppls 981221 LAR 98-010 to Licenses NPF-87 & NPF-89, Clarfying Conditions of Use Re Analytical Methods Used to Determine Core Operating Limits,Per Telcon with NRC ML20211P3761999-09-0707 September 1999 Ack Receipt of Ltr Dtd 990615,transmitting Rev 30 to Physical Security Plan,Per 10CFR50.54(p).No NRC Approval Is Required ML20211L9871999-09-0303 September 1999 Forwards Rev 31 to Technical Requirements Manual. All Changes Applicable to Plants Have Been Reviewed Under Util 10CFR50.59 Process & Found Not to Include Any USQs TXX-9915, Responds to 990701 & 0825 RAI Telcons Re Spent Fuel Pool Temp,Per LAR 98-008,which Requested Increase in Spent Fuel Storage capacity.Marked-up Page 4-1 of CPSES Fuel Storage Licensing Rept, Encl1999-09-0303 September 1999 Responds to 990701 & 0825 RAI Telcons Re Spent Fuel Pool Temp,Per LAR 98-008,which Requested Increase in Spent Fuel Storage capacity.Marked-up Page 4-1 of CPSES Fuel Storage Licensing Rept, Encl ML20211K2231999-08-31031 August 1999 Forwards Txu Electric Comments of Rvid,Version 2 ML20211J3801999-08-27027 August 1999 Forwards Corrected TS Page 3.8-26 to Amend 66 to Licenses NPF-87 & NPF-89,respectively.Footnote on TS Page 3.8-26 Incorrectly Deleted ML20211G7301999-08-26026 August 1999 Forwards Revs 29 & 30 to CPSES Technical Requirements Manual (Trm). Attachments 1 & 2 Contain Description of Changes for Revs 29 & 30 Respectively ML20211G1081999-08-26026 August 1999 Responds to NRR Staff RAI Re Util Mar 1999 Submittal for NRC Review & Approval of Changes to CPSES Emergency Classification Procedure ML20211G3441999-08-25025 August 1999 Forwards Response to NRC RAI on LAR 98-010 for Cpses,Units 1 & 2.Communication Contains No New Licensing Commitments Re Cpses,Units 1 & 2 ML20211B2861999-08-18018 August 1999 Forwards Insp Repts 50-445/99-13 & 50-446/99-13 on 990720- 23.No Violations Noted.Insp Included Implementation of Licensee Emergency Plan & Procedures During Util Biennial Emergency Preparedness Exercise ML20211C4661999-08-18018 August 1999 Discusses Proprietary Info Re Thermo-Lag.NRC Treated Bisco Test Rept 748-105 as Proprietary & Withheld It from Public Disclosure,Iaw 10CFR2.790 ML20210U3981999-08-17017 August 1999 Forwards Monthly Operating Repts for July 1999 for CPSES, Units 1 & 2,per TS 6.9.1.5.No Failures or Challenges to PORVs or SVs for Plant Occurred ML20211C0991999-08-17017 August 1999 Forwards Rev 3 to ASME Section XI ISI Program Plan,Unit 2 - 1st Interval, Replacing Rev 2 in Entirety ML20211C4571999-08-16016 August 1999 Forwards Omitted Subj Page of Contractor TER TXX-9919, Forwards Relief Request A-3,Rev 1 to Unit 1 ISI Program,Per Conversations Between NRC & Txu Electric on 9908021999-08-16016 August 1999 Forwards Relief Request A-3,Rev 1 to Unit 1 ISI Program,Per Conversations Between NRC & Txu Electric on 990802 ML20210R6561999-08-13013 August 1999 Forwards Response to NRR 990805 Telcon RAI Re License Amend Request 98-010,to Increase Power for Operation of CPSES Unit 2 to 3445 Mwth & Incorporating Addl Changes Into Units 1 & 2 TS ML20211A9501999-08-12012 August 1999 Discusses 990720-21 Workshop Conducted in Region IV Ofc,Re Exchange of Info in Area of Use of Risk Insights in Regulatory Activities.List of Attendees,Summary of Topic & Issues,Agenda & Copies of Handouts Encl ML20210S6411999-08-12012 August 1999 Informs That Wg Guldemond,License SOP-43780,is No Longer Performing Licensed Duties.Discontinuation of License Is Requested ML20210R2221999-08-12012 August 1999 Forwards Insp Repts 50-445/99-10 & 50-446/99-10 on 990510-0628.Violations Noted & Being Treated as Ncvs, Consistent with App C of Enforcement Policy ML20210N1101999-08-0404 August 1999 Provides Supplemental Info to Util 990623 License Amend Request 99-005 Re Bypassing DG Trips.Info Replaces Info Contained in Subject Submittal in Attachment 2,Section II, Description of TS Change Request ML20210L1461999-08-0303 August 1999 Informs That NRC Plans to Administer Gfes of Written Operator Licensing Exam on 991006.Requests Submittal of Ltr Identifying Individuals Taking Exam,Personnel Allowed Access to Exams & Mailing Address for Exams ML20210J2301999-08-0202 August 1999 Forwards Amend 96 to CPSES Ufsar.Replacement of FSAR Figures with Plant Process Flow Diagrams Meets Intent & Requirements of NRC Reg Guide 1.70,Rev 2 ML20210J6071999-08-0202 August 1999 Forwards line-by-line Descriptions of Changes in Amend 96 to CPSES UFSAR Transmitted by Util Ltr TXX-99166,dtd 990802. Replacment of FSAR Figures with Plant Process Flow Diagrams Meets Intent & Requirements of NRC Reg Guide 1.70,rev 2 TXX-9916, Notifies NRC That CPSES Units 1 & 2,improved TS Implemented on 9907271999-08-0202 August 1999 Notifies NRC That CPSES Units 1 & 2,improved TS Implemented on 990727 TXX-9918, Forwards CPSES 10CFR50.59 Evaluation Summary Rept 0008,for 970802-990201 & CPSES Commitment Matl Change Evaluation Rept 0003,for 970802-9906301999-08-0202 August 1999 Forwards CPSES 10CFR50.59 Evaluation Summary Rept 0008,for 970802-990201 & CPSES Commitment Matl Change Evaluation Rept 0003,for 970802-990630 ML20210K2321999-07-29029 July 1999 Forwards Insp Repts 50-445/99-12 & 50-446/99-12 on 990530-0710.No Violations Noted ML20210G5861999-07-29029 July 1999 Forwards fitness-for-duty Program Performance Data for Six Month Period of Jan-June 1999 ML20210J0121999-07-27027 July 1999 Forwards Summary of Methodology for Determination of NDE Measurement Uncertainty,In Response to Recent Discussions with NRC Re LAR 98-006 Concerning Rev to SG Tube Plugging Criteria TXX-9917, Provides Info Re Augmented Inservice Insp Plan,Which Requires Periodic Insp of Rv Head & Internals Lifting Devices at CPSES1999-07-26026 July 1999 Provides Info Re Augmented Inservice Insp Plan,Which Requires Periodic Insp of Rv Head & Internals Lifting Devices at CPSES ML20210F3121999-07-26026 July 1999 Responds to GL 99-02, Laboratory Testing of Nuclear-Grade Activated Charcoal, ML20210D8231999-07-23023 July 1999 Forwards Safety Evaluation of Relief Requests Re Use of 1998 Edition of Subsections IWE & Iwl of ASME Code for Containment Insp ML20210D3211999-07-21021 July 1999 Provides List of Estimates of Licensing Actions,In Response to Administrative Ltr 99-02,dtd 990603 ML20210C2931999-07-21021 July 1999 Supplements 880323 Response to NRC Bulletin 88-02, Rapidly Propagating...Sg Tubes, Non-proprietary WCAP-15010 & Proprietary Rev 0 to WCAP-15009, CP Unit 1 Evaluation for Tube Vibration... Encl.Proprietary Rept Withheld ML20209H0111999-07-16016 July 1999 Forwards Relief Request C-4 to CPSES Unit 2 ISI Program for Approval ML20210C3331999-07-16016 July 1999 Forwards Exam Repts 50-445/99-301 & 50-446/99-301 on 990618- 24.Exam Included Evaluation of Six Applicants for Senior Operator Licenses ML20209H2551999-07-16016 July 1999 Forwards ISI Summary Rept for Fourth Refueling Outage of CPSES Unit 2 & Containment ISI Summary Rept for Fourth Refueling Outage of CPSES Unit 2,per ASME Boiler & Pressure Vessel Code,Section Xi,Paragraph IWA-6230 1999-09-07
[Table view] Category:EXTERNAL CORRESPONDENCE
MONTHYEARTXX-9914, Responds to 990525 RAI Re Renewal of Tpdes Permit Number 01854.Explanation & Response to Each Item,Listed1999-06-16016 June 1999 Responds to 990525 RAI Re Renewal of Tpdes Permit Number 01854.Explanation & Response to Each Item,Listed ML20206E7271999-04-29029 April 1999 Submits Original & Four Complete Copies of Application for Renewal of Permit to Discharge,Deposit or Dispose of Wastes Into or Adjacent to Water in State. with Three Oversize Drawings ML20045D3451992-06-16016 June 1992 Discusses Util Review of 920603 Ltr Outlining Thermal Science,Inc Field Surveillance of Application of Thermo-Lag 330 Fire Barrier Sys on Util Test Assemblies at Omega Poing Labs.Supporting Documentation Encl ML20091Q2891992-01-27027 January 1992 Forwards Rev 7 to Quarterly Plant Performance & Other Indicator Data for Fourth Quarter of 1991 & Gross Heat Rate Data Form for 1991 ML20070T7651991-04-0101 April 1991 Forwards 910327 License Amend Request 91-001 Re Addition of Spec 3/4.7.12 & Bases 3/4.7.12 for Safety Chilled Water Sys ML20073D1051991-03-29029 March 1991 Comments on Final Rept Addressing Scaling for Unit 1,dtd Feb 1991 Per Insp Repts 50-445/90-47 & 50-446/90-47.Concerns Raised That Util Selected Criterion XI Re Test Control as Sole Mgt Std to Control safety-related Activities ML20066A5711990-12-19019 December 1990 Forwards Update to ASME Section Iii,Div 1 Code Control Program Documents for Incorporation Into State of Tx Dept of Licensing & Regulation Controlled Manual CCPM-15,authored by Ebasco ML20056B3741990-08-21021 August 1990 Forwards Update to ASME Section Iii,Div 1 Code Control Program Documents for Incorporation Into State of Tx Dept of Licensing & Regulation Controlled Manual CCPM-15 ML20011E1521990-01-27027 January 1990 Forwards Addl Case Concern Repts 89-0025 Re Apparent Substandard Shop Applied Welds Internal to Secondary Side of Steam Generators & 89-0034 on Specific Wiring & Connection Method Damaging safety-related Electrical Wiring ML20248D0661989-09-21021 September 1989 Notifies Util of Case Position on Concerns & Problems in Scaling Calculation Program at Plant.Documentary Info Supporting Util Position on Aspect of Dispute Should Be Provided ML19332C7971989-09-14014 September 1989 Forwards Offsite Portion of Annual Emergency Preparedness Independent Review & Status of Corrective Actions Initiated, Per 10CFR50.54(t) ML19332E0011989-09-14014 September 1989 Forwards Offsite Portion of Annual Emergency Preparedness Independent Review Per 10CFR50.54(t) ML19332D4781989-09-14014 September 1989 Forwards Offsite Portion of Annual Emergency Preparedness Independent Review to Be Conducted Every 12 Months.Review Must Include Evaluation for Adequacy of Interfaces W/State & Local Govts ML19332C8171989-09-14014 September 1989 Forwards Offsite Portion of Annual Emergency Preparedness Independent Review & Status of Corrective Actions Initiated, Per 10CFR50.54(t) ML20246A0421989-08-18018 August 1989 Advises That S&W Notified by Util That Responsibility for Facility Code Control Program Will Be Terminated Effective on 890823.EBASCO Svcs,Inc Selected to Assume Responsibility for Code Control Program Effective on 890824 ML20247R7291989-07-28028 July 1989 Advises That Status of Suspect molded-case Curcuit Breakers, Identified in Initiative Element One Will Be Provided by 890815.Util Estimates That 750 nonsafety-related Breakers in Warehouse Stock Examined as Part of Initiative Element Two ML20247D2491989-07-12012 July 1989 Forwards Communications Repts Associated W/Design Control Review ML20247A9261989-05-11011 May 1989 Forwards State of Tx & Local Govt Objectives for Graded Exercise Scheduled for 890725-26 ML20245J3341989-04-0707 April 1989 Forwards Summary of Points of Agreement Reached at 890308 Meeting.Agreements Will Be Subj to Further Discussion Among Parties.W/Certificate of Svc.Served on 890427 ML20246H4791989-03-0606 March 1989 Forwards Communications Repts Associated W/Corrective Action Programs for Plant Independent Assessment Program Phases ML20206F7201988-11-14014 November 1988 Forwards Communications Rept Transmittal 47 Re Independent Assessment Program on All Phases of Conduit Support Design Review ML20151X2621988-08-19019 August 1988 Forwards Rev 4 to Independent Assessment Program:Conduit Support Design Review Issues List for Comanche Peak Electric Station - Unit 1 ML20154H6281988-05-21021 May 1988 Requests to Be Advised at Earliest Opportunity Whether Projected Schedule for Issuance of Phase IV Rept Available. Related Correspondence ML20147G2941988-03-0303 March 1988 Forwards Communication Repts Re Cable Tray Audits,Per Independent Assessment Program ML20147F8911988-03-0303 March 1988 Forwards Communications Repts Associated W/Piping/Pipe Support Audits ML20147H4891988-03-0303 March 1988 Forwards Communications Repts Associated W/Independent Assessment Program Conduit Audits ML20147G2261988-03-0303 March 1988 Forwards Communications Repts Associated W/Civil/Structural Audits ML20196F7451988-02-23023 February 1988 Forwards Surveillance Repts Associated W/Phase 4 Independent Assessment Program Obtained During Util Review ML20196D4541988-02-0909 February 1988 Forwards Rev 4 of Mechanical Review Issues List (Ril). Rev Includes Review Issue 10 Re Component Cooling Water Sys Butterfly Valve at Outlet of Residual Heat Removal Hx.Rev of Ril Reflects Info That Cygna Gained Prior to Dec 1987 ML20236X2701987-11-25025 November 1987 Forwards Communications Repts on Independent Assessment Program,Phase 4 Re Cable Tray,Civil/Structural & Conduit Audits ML20236S1281987-11-13013 November 1987 Forwards Communications Repts Associated W/Civil/Structural Audits.List of Communications Repts Encl ML20236R9531987-11-13013 November 1987 Forwards Communications Repts Associated W/Cable Tray Audits.List of Communication Repts Encl ML20236S3231987-11-13013 November 1987 Forwards Communications Repts Associated W/Conduit Audits. List of Communications Repts Encl ML20236R9361987-11-13013 November 1987 Forwards Communications Repts Associated W/Piping/Pipe Support Audits.Repts Also Listed in Attachment ML20236M3131987-11-0909 November 1987 Forwards Communications Repts Associated W/Cable Tray Audits,Per Communication Repts Transmittal 33 for Independent Assessment Program - All Phases.List of Encl Communication Repts Provided on Attachment 1 TXX-6932, Advises That Value of 7.43 Ph Units Reported in Performance Evaluation Rept DMR-QA Study 7 Re 1987 NPDES QA Program Incorrect Due to Clerical Error.Reported Value Should Have Been 8.43 Ph Units,Which Is within Acceptable Range1987-11-0606 November 1987 Advises That Value of 7.43 Ph Units Reported in Performance Evaluation Rept DMR-QA Study 7 Re 1987 NPDES QA Program Incorrect Due to Clerical Error.Reported Value Should Have Been 8.43 Ph Units,Which Is within Acceptable Range ML20235W3331987-10-10010 October 1987 Forwards Communications Repts Re Civil/Structural Audits,Per Independent Assessment Program,Phase 4 ML20235V4691987-10-10010 October 1987 Forwards Communications Repts Re Cable Tray Audits,Per Facility Independent Assessment Program,Phase 4 ML20235R4941987-09-30030 September 1987 Notifies of Confirmation That Util Given Extension Until 871026 to Respond to Case Motion to Compel Applicants to Supply Complete Answers to Consolidated Intervenors Interrogatories & Request for Production of Documents ML20235R1961987-09-18018 September 1987 Forwards Rev 4 of Pipe Support Review Issues List. Any Procedural Control Issues Associated W/Author Original Pipe Support Reviews of Gibbs & Hill Being Processed as Part of Ongoing Design Control Assessments ML20235R0571987-09-18018 September 1987 Forwards Communications Repts Re Cable Tray Audits ML20234B1451987-09-16016 September 1987 Forwards Rev 4 to Pipe Stress Review Issues List (Ril).All Technical Issues Associated W/Discipline Closed.Still Waiting for S&W Calculation 15454-NZ(B)-GENX-035,Rev 2 to Verify Completion of Commitments Associated W/Ril 11 TXX-6718, Forwards Listed Outstanding Documents Requested Through Audits of Ebasco Svcs,Inc1987-09-0404 September 1987 Forwards Listed Outstanding Documents Requested Through Audits of Ebasco Svcs,Inc ML20238E5591987-09-0303 September 1987 Confirms That Brazos Understanding of Phrase,As Set Forth in Objections & Responses of 870814,essentially Correct. Related Correspondence ML20237K7081987-09-0101 September 1987 Forwards Communications Rept Transmittal 28,transmitting Cable Tray Audits Re Independent Assessment Program - Phase 4 for Plant.Delay in Processing Telcons Noted Due to Word Processing Sys Conversion.W/O Encl ML20237K7931987-09-0101 September 1987 Forwards Communications Rept Transmittal 29,transmitting Piping/Pipe Support Audits for Independent Assessment Program Phase 4.W/o Encl ML20237J9981987-09-0101 September 1987 Forwards Communications Rept Transmittal 27,transmitting Conduit Audits Re Independent Assessment Program - Phase 4 for Plant.Delay in Processing Telcons Noted Due to Word Processing Sys Conversion.W/O Encls ML20237K0091987-08-11011 August 1987 Memorializes Recent Conversations & Resulting Agreement Re Extension of Time Until 870908 for Filing Case & M Gregory Response to Applicant 870713 Motion for Reconsideration of Board 870622 Order.Related Correspondence ML20237J1281987-08-10010 August 1987 Forwards Rev 14 of Cable Tray Supports Review Issues List. Rev Based on Info Provided in Util Rev 2 to Generic Issues Rept for Cable Tray Hangers,Transcripts of Public Meetings & Results of Cynga Audits Through 870731 ML20236D3271987-07-22022 July 1987 Forwards Rev 0 to Civil-Structural Review Issues List, Based on Ref Info,Transcripts of Public Meetings,Documents Provided by Util & Results of Cygna Audits Through 870613 1999-06-16
[Table view] Category:EXTERNAL LETTERS ROUTED TO NRC
MONTHYEARML20056B3741990-08-21021 August 1990 Forwards Update to ASME Section Iii,Div 1 Code Control Program Documents for Incorporation Into State of Tx Dept of Licensing & Regulation Controlled Manual CCPM-15 ML20011E1521990-01-27027 January 1990 Forwards Addl Case Concern Repts 89-0025 Re Apparent Substandard Shop Applied Welds Internal to Secondary Side of Steam Generators & 89-0034 on Specific Wiring & Connection Method Damaging safety-related Electrical Wiring ML20248D0661989-09-21021 September 1989 Notifies Util of Case Position on Concerns & Problems in Scaling Calculation Program at Plant.Documentary Info Supporting Util Position on Aspect of Dispute Should Be Provided ML19332E0011989-09-14014 September 1989 Forwards Offsite Portion of Annual Emergency Preparedness Independent Review Per 10CFR50.54(t) ML19332D4781989-09-14014 September 1989 Forwards Offsite Portion of Annual Emergency Preparedness Independent Review to Be Conducted Every 12 Months.Review Must Include Evaluation for Adequacy of Interfaces W/State & Local Govts ML19332C8171989-09-14014 September 1989 Forwards Offsite Portion of Annual Emergency Preparedness Independent Review & Status of Corrective Actions Initiated, Per 10CFR50.54(t) ML19332C7971989-09-14014 September 1989 Forwards Offsite Portion of Annual Emergency Preparedness Independent Review & Status of Corrective Actions Initiated, Per 10CFR50.54(t) ML20246A0421989-08-18018 August 1989 Advises That S&W Notified by Util That Responsibility for Facility Code Control Program Will Be Terminated Effective on 890823.EBASCO Svcs,Inc Selected to Assume Responsibility for Code Control Program Effective on 890824 ML20247R7291989-07-28028 July 1989 Advises That Status of Suspect molded-case Curcuit Breakers, Identified in Initiative Element One Will Be Provided by 890815.Util Estimates That 750 nonsafety-related Breakers in Warehouse Stock Examined as Part of Initiative Element Two ML20247D2491989-07-12012 July 1989 Forwards Communications Repts Associated W/Design Control Review ML20247A9261989-05-11011 May 1989 Forwards State of Tx & Local Govt Objectives for Graded Exercise Scheduled for 890725-26 ML20245J3341989-04-0707 April 1989 Forwards Summary of Points of Agreement Reached at 890308 Meeting.Agreements Will Be Subj to Further Discussion Among Parties.W/Certificate of Svc.Served on 890427 ML20246H4791989-03-0606 March 1989 Forwards Communications Repts Associated W/Corrective Action Programs for Plant Independent Assessment Program Phases ML20206F7201988-11-14014 November 1988 Forwards Communications Rept Transmittal 47 Re Independent Assessment Program on All Phases of Conduit Support Design Review ML20151X2621988-08-19019 August 1988 Forwards Rev 4 to Independent Assessment Program:Conduit Support Design Review Issues List for Comanche Peak Electric Station - Unit 1 ML20154H6281988-05-21021 May 1988 Requests to Be Advised at Earliest Opportunity Whether Projected Schedule for Issuance of Phase IV Rept Available. Related Correspondence ML20147F8911988-03-0303 March 1988 Forwards Communications Repts Associated W/Piping/Pipe Support Audits ML20147G2941988-03-0303 March 1988 Forwards Communication Repts Re Cable Tray Audits,Per Independent Assessment Program ML20147H4891988-03-0303 March 1988 Forwards Communications Repts Associated W/Independent Assessment Program Conduit Audits ML20147G2261988-03-0303 March 1988 Forwards Communications Repts Associated W/Civil/Structural Audits ML20196F7451988-02-23023 February 1988 Forwards Surveillance Repts Associated W/Phase 4 Independent Assessment Program Obtained During Util Review ML20196D4541988-02-0909 February 1988 Forwards Rev 4 of Mechanical Review Issues List (Ril). Rev Includes Review Issue 10 Re Component Cooling Water Sys Butterfly Valve at Outlet of Residual Heat Removal Hx.Rev of Ril Reflects Info That Cygna Gained Prior to Dec 1987 ML20236X2701987-11-25025 November 1987 Forwards Communications Repts on Independent Assessment Program,Phase 4 Re Cable Tray,Civil/Structural & Conduit Audits ML20236S3231987-11-13013 November 1987 Forwards Communications Repts Associated W/Conduit Audits. List of Communications Repts Encl ML20236S1281987-11-13013 November 1987 Forwards Communications Repts Associated W/Civil/Structural Audits.List of Communications Repts Encl ML20236R9531987-11-13013 November 1987 Forwards Communications Repts Associated W/Cable Tray Audits.List of Communication Repts Encl ML20236R9361987-11-13013 November 1987 Forwards Communications Repts Associated W/Piping/Pipe Support Audits.Repts Also Listed in Attachment ML20236M3131987-11-0909 November 1987 Forwards Communications Repts Associated W/Cable Tray Audits,Per Communication Repts Transmittal 33 for Independent Assessment Program - All Phases.List of Encl Communication Repts Provided on Attachment 1 TXX-6932, Advises That Value of 7.43 Ph Units Reported in Performance Evaluation Rept DMR-QA Study 7 Re 1987 NPDES QA Program Incorrect Due to Clerical Error.Reported Value Should Have Been 8.43 Ph Units,Which Is within Acceptable Range1987-11-0606 November 1987 Advises That Value of 7.43 Ph Units Reported in Performance Evaluation Rept DMR-QA Study 7 Re 1987 NPDES QA Program Incorrect Due to Clerical Error.Reported Value Should Have Been 8.43 Ph Units,Which Is within Acceptable Range ML20235V4691987-10-10010 October 1987 Forwards Communications Repts Re Cable Tray Audits,Per Facility Independent Assessment Program,Phase 4 ML20235W3331987-10-10010 October 1987 Forwards Communications Repts Re Civil/Structural Audits,Per Independent Assessment Program,Phase 4 ML20235R4941987-09-30030 September 1987 Notifies of Confirmation That Util Given Extension Until 871026 to Respond to Case Motion to Compel Applicants to Supply Complete Answers to Consolidated Intervenors Interrogatories & Request for Production of Documents ML20235R1961987-09-18018 September 1987 Forwards Rev 4 of Pipe Support Review Issues List. Any Procedural Control Issues Associated W/Author Original Pipe Support Reviews of Gibbs & Hill Being Processed as Part of Ongoing Design Control Assessments ML20235R0571987-09-18018 September 1987 Forwards Communications Repts Re Cable Tray Audits ML20234B1451987-09-16016 September 1987 Forwards Rev 4 to Pipe Stress Review Issues List (Ril).All Technical Issues Associated W/Discipline Closed.Still Waiting for S&W Calculation 15454-NZ(B)-GENX-035,Rev 2 to Verify Completion of Commitments Associated W/Ril 11 TXX-6718, Forwards Listed Outstanding Documents Requested Through Audits of Ebasco Svcs,Inc1987-09-0404 September 1987 Forwards Listed Outstanding Documents Requested Through Audits of Ebasco Svcs,Inc ML20238E5591987-09-0303 September 1987 Confirms That Brazos Understanding of Phrase,As Set Forth in Objections & Responses of 870814,essentially Correct. Related Correspondence ML20237K7931987-09-0101 September 1987 Forwards Communications Rept Transmittal 29,transmitting Piping/Pipe Support Audits for Independent Assessment Program Phase 4.W/o Encl ML20237J9981987-09-0101 September 1987 Forwards Communications Rept Transmittal 27,transmitting Conduit Audits Re Independent Assessment Program - Phase 4 for Plant.Delay in Processing Telcons Noted Due to Word Processing Sys Conversion.W/O Encls ML20237K7081987-09-0101 September 1987 Forwards Communications Rept Transmittal 28,transmitting Cable Tray Audits Re Independent Assessment Program - Phase 4 for Plant.Delay in Processing Telcons Noted Due to Word Processing Sys Conversion.W/O Encl ML20237K0091987-08-11011 August 1987 Memorializes Recent Conversations & Resulting Agreement Re Extension of Time Until 870908 for Filing Case & M Gregory Response to Applicant 870713 Motion for Reconsideration of Board 870622 Order.Related Correspondence ML20237J1281987-08-10010 August 1987 Forwards Rev 14 of Cable Tray Supports Review Issues List. Rev Based on Info Provided in Util Rev 2 to Generic Issues Rept for Cable Tray Hangers,Transcripts of Public Meetings & Results of Cynga Audits Through 870731 ML20236D3271987-07-22022 July 1987 Forwards Rev 0 to Civil-Structural Review Issues List, Based on Ref Info,Transcripts of Public Meetings,Documents Provided by Util & Results of Cygna Audits Through 870613 ML20216D1721987-06-20020 June 1987 Ack Receipt of .Clarifies Agreement Made During Telcon Re Date for Case to File Initial Supplementary Responses Deferred Until 870706.Necessary Discovery & Response Should Be Completed Also.Related Correspondence ML20215D7141987-06-0303 June 1987 Informs All Concerned W/Facility Independent Assessment Program of Address Correction ML20214S0641987-05-26026 May 1987 Ack Receipt of Applicant 870518 Fifth Progress Rept.Requests That Recipient Notify of When Substantive Matls Will Be Made Available So Case May Decide on Course of Action Re Comanche Peak Response Team Adequacy Issues.Related Correspondence ML20234C6731987-05-0101 May 1987 Forwards Communications Repts Associated W/Cygna Audits of S&W Civil/Structural Action Plan Re Plant Independent Assessment Program - Phase 4 ML20234C4401987-05-0101 May 1987 Forwards Communication Repts Re Cygna Audits of S&W Piping & Pipe Support Verification Activities,Per Phase 4 of Independent Assessment Program.Submittal Constitutes Communications Rept Transmittal 23 TXX-6361, Forwards Receipt to Ack Part 21 Rept Re Qualification Test Rept F-C5205-3, Nuclear Qualification - Terminal Blocks1987-03-23023 March 1987 Forwards Receipt to Ack Part 21 Rept Re Qualification Test Rept F-C5205-3, Nuclear Qualification - Terminal Blocks ML20205C0741987-03-18018 March 1987 Forwards Comments & Questions on Ebasco & Util Procedures & Criteria Re Responses to Conduit Support Review Issues List for Upcoming 870324 & 25 Conduit Support Meetings Per Rev 0 to Generic Issues Rept 1990-08-21
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101 Cahfornia Street. Suite 1000. San Francisco. CA 941115894 415 397-5600 February 12, 1985 84056.041 Mr. J. B. George Project General Manger Texas Utilities Generating Company Comanche Peak Steam Electric Station Highway FM 201 Glen Rose Texas 76043
Subject:
Cable Tray Support Review Questions Comanche Peak Steam Electric Station Independent Assessment Program - Phase 4
. Job No. 84056
Dear Mr. George:
We have reviewed our correspondence and telecon files to ascertain the status of the cable tray support review questions asked to date. Attachment A contains a sunnary of currently unanswered cable tray support design review questions.
Additional questions may be asked as we complete our documentation of the TUGC0/Gibbs & Hill responses to previous questions and evaluate the responses to the attached questions. Perhaps some of these questions and their relative effect on design adequacy nay be answered more efficiently as part of the dynamic analyses being conductd on selected systems. Please advise us of any questions being addressed as part of that effort.
If there are any questions while preparing responses, please call.
Very truly yours, N. H. Williams
. Project Manager NHW/rmk cc: Mr. S. Burwell (USNRC)
Mr. S. Treby (USNRC)
Mr. D. Wade (TUGCO)
Ms. J. van Amerongen (EBASC0/TUGCO)
Mrs. J. Ellis (CASE)
Mr. R. Ballard (G&H)
Mr. R. Kissinger (TUGCO)
P BQ P
San . .. ,6.s o Boston Chicago Richland
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Mr. J. B. George February 12. 1985 84056.041 Page 1 of 13 ATTACHENT A CABLE TRAY SUPPORT REVIEW QUESTIONS
- 1. EMBEDDED PLATES
References:
(1) Gibbs & Hill Specification 2323-SS-30, Revision 1 "Struc-tural Embedments," Appendix 4 (2) TRW Nelson Division, Design Data 10. "Embedment Properties of Headed Studs," 1977 (3) Gibbs & Hill calculations SCS-113C, Set 1, sheets 18-19,
. 42-46
- (4) Gibbs & Hill drawing 2323-5-0919, Revision 3 Several cable tray supports within Cygna's review scope are attached to embedded strip plates. These supports are Types SP-7 with brace, SP-7 and Detail F (drawing 2323-El-0601-01-5), which is similar to a multiple SP-7 support. Each of these supports consists of channel sections canti-levered from the embedded plate. These supports resist vertical, trans-verse, and, in the case of Detail SP-7 with brace, longitudinal tray loa ds. The connection between the cantilevered channels and the embedded plate is an all-round fillet weld. Such a connection provides full moment transfer.
The design of the embedded plates for the support types listed above was performed in 1979. In 1981, Gibbs & Hill specification 2323-55-30 revi-sion 0, " Structural Embedments," was issued. Appendix 4 of this specifi-cation lists the criteria and allowables for attachments to embedded strip plates. , Revision 1 of this specification (Reference [1]) did not I alter the criteria or allowables for embedded plates. Cygna has noted l that the criteria listed in the referenced appendix are more stringent l than those used in the original design of the embedded plates for the support types listed above.
Cygna requests a confirmation of the assumptions used in the generic
! embedded plate analysis. Gibbs & Hill has stated that a factor of safety of two was used in the analysis. Rigid plate assumptions as well as prying action effects were also considered. Cygna has calculated the allowable stud tensile loads based on values and reduction procedures reported in Reference (2) above and on a factor of safety of two. The t
values calculated by Cygna were identical to the allowable loads for
! point loadings applied along the plate centerline at stud points. This indicates to Cygna that prying action has not been considered in the
! development of embedded plate allowables.
I
Mr. J. B. George February 12, 1985 84056.041 Page 2 of 13 L ATTACHMENT A CABLE TRAY SUPPORT REVIEW QUESTIONS With regard to the design of the embedded plate connections for the sup-port types listed above, Cygna has noted several inconsistencies between the designs and the criteria reported in Specification 2323-SS-30, Revi-sions 0 and 1. The embedded plate connections that are used for the listed support details are moment resisting connections. Section 3.4 of Reference (1) above states that pin connections are to be used for load transfer to embedded plates. This section also requires that when a mo-ment is to be transferred, the embedded plate connection must be stiff-ened. Further restrictions on moment transfer are listed in Section 4 Gibbs & Hill has stated that all moment connections must be evaluated per
- these sections. Cygna has not seen any evidence that such evaluations were performed for the cable tray supports listed above.
Sheets A4-1 through A4-9 of Appendix 4, reference (1), list the allowable values for various locations of applied point loads. Section 3.1 lists various reductions for locations other than those shown in the Appendix sheets 1-9. These reductions include interpolation of allowable values for attachment locations between the midspan and stud pairs along the longitudinal plate centerline. Interpolation of plate allowables is also required for attachment points between the longitudinal centerline and the stud lines at the plate edge. In addition, a 40 percent reduction is required for end-span loadings. It appears that none of the above reductions was considered in the design of the embedded plates for the listed details.
Section 3.3 notes that the full allowables shown on sheets A4.2 and A4.4 are applicable only when the attachment is within i 3/4 inches of the longitudinal plate centerline. The centerline tolerances allowed in Ref-erences 3 and 4 for beam connections of Details SP-7 and SP-7 with brace, are 1-1/2 inches and 2-1/2 inches for eight and ten inch plates, respectively. A 1-1/2 inch tolerance is allowed for the brace connec-tions of Detail SP-7 with brace. These tolerances exceed those specified in Section 3.3, even though the full allowables were used.
Please provide Cygna with the following:
- 1. Documentation which evaluates the effect of prying action on embed-ded plates and studs;
Mr. J. B. George Februa ry 12, 1985
- 84056.041 Page 3 of 13 ATTACHMENT A CABLE TRAY SUPPORT REVIEW QUESTIONS
- 2. Documentation and justification for the acceptability of the monent connections for Details SP-7, SP-7 with brace and Detail F; and
- 3. Documentation which verifies that the details listed in question 2 above meet the criteria set forth in Appendix 4 of Reference 1.
- 2. AFFECT OF TWO-!NCH THICK ARCHITECTURAL TOPPING ON HILTI BOLT EftBEDt1ENT LENGTH
References:
O (1) TUGC0 SDAR-CP-80-05 dated 8/8/80 (2) Brown & Root Instruction CEI-20. Revision 9 (3) CMC 6114, Revision 4, dated 10/12/83, Support No. 2998 (4) CMC 85720. Revision 0, dated 2/2/83, Support No.13080 Two cable tray supports within Cygna's review scope, support numbers 2998 and 13080, use floor mounted base plates. These supports are located in areas where 2" thick architectural topping is present. A walkdown was performed to verify that sufficient Hilti anchor bolt embedment was pro-vided. Based on the length code stamped on the exposed ends of the in-stalled Hilti Super Kwik bolts and the measured projection, (i.e., the distance from the floor slab to the top of the bolts), the bolts in-stalled are not of sufficient length to provide the minimun embedment specified in References (3) and (4) for these supports.
Cygna calculated minimum embedment length before torquing for these two supports as follows:
t
Mr. J. B. George February 12, 1985 84056.041 Page 4 of 13 ATTACHMENT A CABLE TRAY SUPPORT REVIEW QUESTIONS Embedment = (bolt length) - (topping) - (bolt projection) + (nut thickness)
Support Bolt Bolt Projection Minimum Embedment No. Code Length Above Slab Calculated Required 2998 U 13" 4-3/8" 7-7/8" 8-1/2" 13080 X 16" 4-1/4" 11" 13-1/8" Cygna was provided with a copy of Reference (1) above, when this concern was first discussed with TUGCO. The corrective action indicated in Ref-erence (1) requires a case-by-case evaluation of all Hilti bolts in- '
stalled in areas with two-inch topping. Cygna interprets this as apply-ing only to bolts installed before the date of Reference (1). Since both floor mounted supports within Cygna's scope were installed after that date, they would not have been included in the evaluation.
Reference (1) also indicates that Reference (2) above was revised to reflect the effect of topping on embedment length. Section 3.1.7.1.2 of reference (2) states:
" Expansion bolts which have less than the specified designed embedment length into structural concrete but greater than the values indicated above in 3.1.7.1.1 shall be evaluated by the responsible design engineer. If found to be acceptable "as-is," appropriate design change documents shall be issued. If found to be unacceptable, the expansion bolt shall be reworked in accordance with 3.1.7.1.1 a or b."
Assuming that this criteria was followed for the installation of support numbers 2998 and 13080, the Quality Control inspection travelers should show that the "specified designed embedment length" was not met, and that an evaluation was performed by the " responsible design engineer."
Please provide copies of the existing design change documentation for these supports indicating the acceptability of the reduced embeddent length. If no documentation exists, please assess the impact of this issue on other floor mounted supports in the areas where two-inch topping is used.
Mr. J. B. George Februa ry 12, 1985 84056.041 Pa ge 5 of 13 ATTAC K NT A CABLE TRAY SUPPORT REVIEW QUESTIONS
- 3. CONTROLLING LOAD CASE FOR ONE-BOLT BASE ANGLE ANALYSIS
References:
(1) Gibbs & Hill Drawings: 2323-S-0903, Detail 1 2323-S-0908 2323-S-0909 (2) Conference Report dated 11/14/84, 2:15 p.m.; Bhujang, Chang, Berry, Horstman and Russ
, (3) THE Calculation by J.C.C. dated 11/15/84, " Investigation
, of Single Clip Angle" (4) Gibbs & Hill Calculation Binder SCS-215C, Set 4 During the discussion regarding the analysis of Detail 1, one-bolt base angle connections, as noted in Reference (2) above, Gibbs & Hill was to determine the controlling load case for this connection, i.e., the max-imum loads. The calculations provided, Reference (3) above, use the loads from a B-2 type support, but do not provide any comparison to show that this is the controlling case. Based on Cygna's review of existing calculations, it appears that other support types may develop larger loads for this connection detail. An example of a support type with larger loads is case E-4, per Reference (4) above, sheets 16-20.
Please provide documentation indicating the controlling load case for the one-bolt base angle and an analysis considering these loads.
- 4. WORKING POINT DEVIATION CALCULATIONS Cygna has reviewed the Gibbs & Hill working point analysis performed in March and April 1984. This review identified problems with boundary conditions (unjustified restraint of frames in the longitudinal direction) and the effects of closely spaced modes. Gibbs & Hill revised the working point analysis to correct these discrepancies and resubmitted them to Cygna for review. Based on discussions with site personnel, Cygna understands that any work associated with the closure of the working point study has been suspended until the NRC mandated as-built program is completed. Cygna, however, has concerns about the analysis
Mr. J. B. George February 12, 1985 84056.041 Page 6 of 13 ATTACHMENT A CABLE TRAY SUPPORT REVIEW QUESTIONS and its application which would not be addressed by an as-built program alone.
The working point study establishes cut-off elevations below which the supports may be considered acceptable for given working point deviations. This evaluation is based on assuned accelerations, 8'-6" tray spans, enveloping aspect ratios, and maximum permissible working point deviations. Above these elevations, Gibbs & Hill evaluated the supports on a case-by-case basis using design documents only. No consideration was given to trays where the unit weight exceeded 3S lb/sf
- due to added fire protection or to the as-built support configuration as
- reflected by applicable CMC's and DCA's. Cygna has identified spans up to 12 feet (reference Cygna letter 84056.019 dated 8/10/84) in length which indicates that there would be a problem in justifying the qualification of trays below a given elevation using an assumed 8'-6" spa n. Further, for supports located above the cut-off elevation where the map drawing shows spans greater than 8 feet, an additional 6" installation tolerance must also be considered.
The effect of possible variations in aspect ratio, fire protection weight and actual working point deviations must be considered in the same manner as the above concerns regarding span violations. Further, Quality Control's use of a working point deviation criteria as the sole means of ensuring compatibility with the Gibbs & Hill analysis will not unto itself ensure design adequacy.
Please indicate the plan of action TUGC0 will use to resolve this issue.
- 5. DETAILS F-H, DRAWING 2323-El-0601-01-S AND SP-7, EFFECTS OF SMALLER WELD SIZE AND UNDERRUN
Reference:
(1) Conference Report dated 11/17/84, 8:00 a.m.; Cha ng ,
Huang, Horstman, Russ and Williams From the referenced conference report:
i 4
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Mr. J. 8. George Februa ry 12, 1985
. 84056.041 Page 7 of 13 ATTACHMENT A CABLE TRAY SUPPORT REVIEW QUESTIONS "Cygna has reviewed the Gibbs & Hill calculations which address the change in fillet weld size (3/16" vs.1/4") for Details F-H. Cygna has noted that when the effects of eccentric loads are considered, the welds appear to be overstressed. The Gibbs & Hill calculations did not consider these effects. Gibbs & Hill inquired if the member was also overstressed. Cygna responded that for a 4'-9" cantilever length details SP-7 and F-H there is a resulting 4% over-stress. Cygna provided the following list of details which appear to exhibit overstress conditions in the weld and/or
, member.
For 3/16" fillet weld without underrun:
(a ) Details F-H without brace with 30" tray and maximum moment arm.
(b) SP-7 attached to embedded plate with 24" and 30" trays.
(c) SP-7 with brace attached to embedded plate with 24" and 30" trays. (Gibbs & Hill noted that allowable tray spans for embedded plates is 7'-6".)
(d) Details F-H attached to embedded plate with 24" and 30 " trays.
For 3/16" fillet weld with 1/32" underrun for all tray sizes:
(a ) Details F-H.
, (b) Details F-H attached to embedded plate.
(c) SP-7 attached to embedded plate.
(d) SP-7 with brace attached to embedded plate.
i Potential member overstress examples include:
(a ) Details F-H with 30" tray.
(b) Details F-H attached to embedded plate.
, (c) SP-7 attached to embedded plate.
l (d) SP-7 with brace attached to embedded plate."
i
Mr. J. B. George February 12, 1985
. 84056.041 Page 8 of 13 ATTACMMENT A CABLE TRAY SUPPORT REVIEW QUESTIONS U
Please indicate the plan of action TUGC0 will use to address the potential weld and member overstresses indicated above.
- 6. WELD DETAIL FOR CONNECTION OF CHANNELS TO CLIP ANGLES
References:
(1) Gibbs & Hill Drawings: 2323-S-0901
. 2323-S-0902
. 2323-5-0903 (2) Brown & Root Drawing FSE-00159 (3) Conference Report, dated 11/17/84, 8:00 a.m. ; Chang, Huang, Horstman, Russ and Williams (4) Conference Report, dated 12/19/84, 9:30 a.m. ; Keiss, Warner, Mercer, van Amerongen, Horstman and Russ (5) Gibbs & Hill Calculation Binder SCS-215C, Set 2 (6) Gibbs & Hill Calculation Binder SCS-122C, Set 3 (7) Gibbs & Hill Calculation Binder SCS-146C, Set 1 (8) CMC 82988, Revision 0, dated 11/15/82, Revision 1, dated 3/7/83 and Revision 2, dated 7/11/84 (9) DCA 20228, Revision 0, dated 4/10/84 and Revision 1, dated 4/30/84 (10) RFIC EH-1842, dated 11/5/82 A review of the cable tray support design drawings, Reference (1), showed that no minimum length is specified for the weld attaching a support channel to the angle section used as a base plate. Suppcrt types for which the weld length is not specified include Details 1, 4 B, C, D.
Case SP-7 plan, etc. The hanger assembly drawings, Reference (2), typi-cally indicate the distance between the face of concrete and the end of the channel to be 1-1/4", but specify no tolerance for this dimension.
The 1-1/4" dimension results in a 3-3/4" lap between the channel and an L5 x 5 x 3/4.
Referring to the discussion in Reference (4), TUGC0 indicated that the 1-1/4" dimension was used as a maximum distance for installations where the channel was attached on the outside of the angle (Type II). It was also
Mr. J. B. George February 12, 1985 84056.041 Page 9 of 13 ATTACHE NT A CA8LE TRAY SUPPORT REVIEW QUESTIONS used as a minimum distance for installations where the channel was at-tached on the inside of the angle (Type I). (Due to the internal radius on the angle, a member can not be attached any closer than "k" from the heel of the angle, e.g., k = 1-1/4" for L6 x 6 x 3/4 and L5 x 5 x 3/4.)
If the channel laps into the fillet at the corner, it does not lie flat against the leg of the angle and a gap will result. Mr. Warner assured Cygna that the weld fit-up inspection prevents this from occurring and that the weld inspection assures that the proper weld, including end returns, is installed.
~
If 1-1/4" is used as the minimum distance for Type I connections, the resulting weld length could be less than 3-3/4". In Gibbs & Hill's eva-luation of weld size underrun, a weld length of 3-3/4" was used per Ref-erence (6) for the standard connection details and per Reference (7) for SP-7 and SP-7 with brace. The use of a shorter weld length could result in an overstress in the welds used in this detail. Per Reference (10),
clarification on this natter was requested by site personnel and as a result CMC 82988 [ Reference (8)] was issued to give specified tolerances on the connecting weld length. CMC 82988 was issued in November 1982, by which time the nejority of the Unit 1 cable tray supports had already been installed.
Further review by Cygna noted that due to the radius at the toe of an angle section, a gap will exist between the web of a channel and the an-gle section at the toe. (See Figure 1.) In order to achieve a 3-3/4" weld length and the necessary return, the fillet weld must bridge this ga p. Cygna believes that without the use of a special welding procedure, a fillet weld will not achieve its full effective throat at this location, and thus the weld section properties will be less than considered in the design calculations.
Plese provide the following:
- The documentation fron engineering used by Brown & Root to establish the 1-1/4" distance between the face of concrete and the end of channel shown on FSE-159 drawing sheets. This was previously requested in the Reference (4) conference report,
Mr. J. B. George February 12, 1985 84056.041 Page 10 of 13 ATTACHMENT A CABLE TRAY SUPPORT REVIEW QUESTIONS e The installation tolerance for the connecting weld length that was used prior to the issuance of CMC 82988 and provide assurance that a minimum weld length of 3-3/4" was always provided.
- The welding procedure which applies to performing a fillet weld over the gap between the channel and the toe of the angle section or documentation to show the acceptability of the connection.
- 7. WELD DETAILS AFFECTED BY GENERIC CHANGE DOCUMENTATION
References:
O (1) CMC 58338, Revision 0 (2) Gibbs & Hill Calculation Binder SCS-122C, Set 3 (3) Conference Report dated 11/17/84, 8:00 a.m.; Chang, Huang, Russ, Horstman and Williams As discussed in the referenced conference report, Cygna indicated that in order to evaluate the effect of the use of 1/4" fillet welds for cable tray support fabrication, generic CMC's and DCA's which address changes in welding requirements must be reviewed. Cygna provided a list of CMC's and DCA's affected by this concern, but noted that the list should be checked for completeness.
During additional review, Cygna located CMC 58338, which may be effected by this concern. This CMC allows an alternate weld pattern to be used for the connection between the beam and hanger members. An evaluation of the weld pattern using a horizontal run along with top and bottom flanges of the (C x 7.25 results in an approximate 20% reduction in tne torsional modulus compared to the value used in the weld evaluation per Reference (2). The CVC for this CMC indicates that no calculations were required.
Please provide the following:
- Justification for the adequacy of this alternate weld pattern, taking into account the potential of weld size underrun and the use of 1/4" weld size for this connection detail.
Mr. J. B. George February 12, 1985 84056.041 Page 11 of 13 ATTAC MENT A CABLE TRAY SUPPORT REVIEW QUESTIONS
- The status of Gibbs & Hill's investigation into the effect of the reduced weld size on the design review of the generic CMC's and DCA's for weld details.
- 8. INSTALLATION TOLERANCES FOR CABLE TRAY SUPPORTS
References:
(1) DCA 20228, Revision 1 (2) DCA 9738. Revision 3 (3) Specification 2323-SS-16B DCA 9738 provides the following revision to specification 2323-SS-16B:
9.6 TOLERANCE
9.6.1 In general, all structural steel work shall be plumb and level within the tolerance 1:500.
9.6.2 Hangers for electrical raceway systems shall be installed within following tolerances. The cumulative effect of rolling (mill),
fabrication and erection tolerances shall not exceed those given below:
- A hanger shall be considered plumb if the angle between the longitudinal axis of the main member (s) of the hanger is at right (90') angles to the supporting surface (ceiling or floor). A tolerance of a 2',
unless otherwise noted, shall be acceptable provided the integrity of the supported raceway system and its attachments to the hanger remains intact.
e Hangers supported on vertical surface (wall, column, side of a beam, etc.) shall be considered level with maximun tolerance of 1/2" in 10 feet.
Mr. J. 8. George February 12, 1985 o 84056.041 Page 12 of 13 ATTACHMENT A CABLE TRAY SUPPORT REVIEW QUESTIONS
- Use of extreme boundaries of such tolerances may be at times aesthetically unacceptable and the owner or its representative way provide stricter tolerances on case by case basis.
Cygna is concerned by the potential effects of the
- 2* tolerance for the plumbness of the hanger on the axial load carrying capacity of the mem-ber. For a typical 12'-0" high support, 2* slope results in a 5" offset of the lower end of the hanger. This offset could result in additional
, bending stresses in the vertical members when axial loading is consid-o ered.
Please provide the following:
e A copy of the design review calculations for DCA 9738 considering the effect of the 2' tolerance on support design.
e The procedure used by the responsible engineer to determine if a finer tolerance is needed to assure that the " integrity of the supported raceway system and its attachment to the hanger remains intact."
- 9. DETAIL "5", DRAWING 2323-S-0905, SUPPORT NO. 3136
References:
(1) CMC 8229. Revisions 0 - 13 I (2) Gibbs & Hill Calculation Binder SAB-1341, Set 3 Cygna review of the " Design Review" Calculations for CMC 8229, Reference (2), indicated that there are several potential errors in these calcula-tions. Cygna provided a list of questions and comments, pertaining to these calculations, to Mr. B. K. Bhujang on October 20, 1984. No re-sponse has been received from Gibbs & Hill.
Please provide Cygna with the status of this review.
Mr. J. B. George February 12, 1985 84056.041 Page 13 of 13 ATTACHMENT A CABLE TRAY SUPPORT REVIEW QUESTIONS
- 10. DETAIL "H". DRAWING 2323-El-0601-01-S, SUPPORT NO. 734
References:
(1) Brown & Root Drawing FSE-00159, Sheet 734 (2) CMC 164, Revision 4 (3) Conference Report, dated 10/27/84, 9:15 a.m. ; Keiss, van Amerongen, Chang, Huang, Russ, and Williams Responding to the discussion in the referenced conference report, Cygna
. noted that this support has deviated from the generic design for detail H .
. without brace by rotating one of the channels 90' from the standard orientation. Heavy duty clamps were installed per Reference (2). No consideration was given to the additional of longitudinal loads to this support. The conclusion from Reference (3) was for TUGC0 to provide Cygna with calculations evaluating this support's as-built condition.
Please provide the calculations generated by TUGC0 in response to the discussion.
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