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Category:ARCHIVE RECORDS
MONTHYEARML20116A0341996-07-17017 July 1996 Rev 0 to Temp Vs Distance Profile for 10 RHR Line Containing Stagnant Water ML20058Q4061993-08-30030 August 1993 Package Consisting of Employee Concerns Programs ML20128G9491993-01-22022 January 1993 Calculation of Weights Due to Fire Protection Matl ML20128G9551992-12-29029 December 1992 Design Validation of Conduits W/Thermolag ML20128G9861992-10-0202 October 1992 Ampacity of Power Cable Wrapped W/330-660 Installed as Free Air Drop ML20105A7981992-08-14014 August 1992 Rev 0 to Calculation of Thermal Response for Sprinkler & Raceway Supports ML20101G0471992-06-17017 June 1992 Rev 3 to Calculation 2-FP-0085 Raceway & Firezone R Cable Supports Analysis ML20115B6851992-03-0202 March 1992 Rev 0 to 2-NP-GENX-544, Reconciliation of Local Stress Evaluation Using ME215 Analysis ML20104B4001992-02-13013 February 1992 Rev 1 to Calculation RXE-TA-CP1/0-027, Undervoltage/ Underfrequency Reactor Trip Setpoints ML20127H2091991-11-12012 November 1991 Calculation 2-NP-GENX-551, Evaluation of NUREG-0797 Suppl 1A (Sser 14) App a Sections 12.1 & 12.2 ML20082U5851991-05-0808 May 1991 Liner Attachment Welds Serviceability ML20055E2881990-03-12012 March 1990 Package Consisting of Event Notification Worksheet Re 900312 Inadvertent Safety Injection from Single Train.No Equipment Malfunction/Failure Noted ML20072A8471990-01-23023 January 1990 Rev 2 to Calculation 071, Review Statement for Safety Related Calculations ML20042D3711989-09-28028 September 1989 Audit Rept ATP-89-146S, Scaling Calculations, on 890821-0928 ML20247G4111989-03-31031 March 1989 Transit Time Flow Meter Calculations ML20151T3841988-08-0101 August 1988 Protocol Between OSP & NRR for Technical Review of Comanche Peak Fsar ML20151K5841988-04-18018 April 1988 Page from Draft Rept on Plant Safeteam Activity & Ofc of Investigations Review IR 05000445/19820141988-03-11011 March 1988 Draft of Insp Rept 50-445/82-14 Originally Withheld from FOIA-84-210 Response & Typing Cover Sheets or Transmittal Pages of Documents Withheld from FOIA-86-181 Response ML20148F8201988-01-21021 January 1988 Rev 0 to Investigation of SIF for Weld Shrinkage ML20148F8631988-01-21021 January 1988 Rev 1 to Parallel Snubbers ML20148F2151987-11-19019 November 1987 Rev 0 to Potential Binding of Lugs in Axial Supports ML20237K9771987-08-19019 August 1987 Press Release 87-115 Informing of NRC Release of Documents Re Investigation of NRC Actions Involving Plant Under Const. Portions of Documents Deleted for Personal Privacy Reasons or Prospective Personnel Matters ML20151M9601987-07-20020 July 1987 Package of NRC Administered Requalification Exam Results Summary ML20148F2521987-05-22022 May 1987 Rev 0 to Evaluation of Fluid Transient Cutoff Forces & Development of Screening Criteria for Piping Sys ML20237K0381987-05-14014 May 1987 Record of 870514 Telcon W/S&W & Util Re Insp Requirements for Pipe Supports (Ref Item 4,SWEC NA-1140 Rept) ML20237K0201987-05-13013 May 1987 Record of 870513 Telcon W/S&W & Util Re Insp Requirements for Pipe Supports for Plant.S&W Does Not Consider Insp of Designs to Be Warranted ML20236M4011987-04-17017 April 1987 Package Consisting of 870417 Request for Premium Cost Mail Svc & Unsigned & Undated Ltr to Util Forwarding Draft Insp Repts 50-445/87-02 & 50-446/87-02 & Notice of Deviation ML20128G9681987-02-24024 February 1987 Cable Ampacity Derating Factors for Conduits Boxed in W/ Thermolag (TSI Product) ML20236L9091987-02-19019 February 1987 Rev 1 to CT-1-137-701-S25R, Pipe Support Calculation ML20236N4981987-02-0202 February 1987 Package Consisting of Comanche Peak Steam Electric Station Design Change Authorizations & Evaluation Summaries ML20207D7231986-12-23023 December 1986 Pipe Support Calculation:General Calculation for Richmond Insert/Tube Steel Connections Design Mods ML20207D7481986-12-23023 December 1986 Generic Calculation:Evaluation of Npsi Rear Brackets, Dimension for Design Calculation IA-86-386, Package Consisting of Potential Violations Not Included in Proposed Enforcement Package & Violations of Little Safety Significance Not Included in Proposed Enforcement Package1986-12-16016 December 1986 Package Consisting of Potential Violations Not Included in Proposed Enforcement Package & Violations of Little Safety Significance Not Included in Proposed Enforcement Package ML20211P4701986-12-16016 December 1986 Package Consisting of Potential Violations Not Included in Proposed Enforcement Package & Violations of Little Safety Significance Not Included in Proposed Enforcement Package IA-85-799, Partially Withheld Package of Info Re Plant Investigation, Including Draft NRC Ltr to Aslb,Partial Transcript & Handwritten Notes1986-12-0101 December 1986 Partially Withheld Package of Info Re Plant Investigation, Including Draft NRC Ltr to Aslb,Partial Transcript & Handwritten Notes ML20214R3351986-12-0101 December 1986 Partially Withheld Package of Info Re Plant Investigation, Including Draft NRC Ltr to Aslb,Partial Transcript & Handwritten Notes ML20235S1101986-11-15015 November 1986 Package of Documents Re Nomination & Authorization for Cash Awards to NRC Personnel Involved W/Insp Efforts Re Implementation of Util Comanche Peak Response Team Program IA-87-528, Package of Documents Re Nomination & Authorization for Cash Awards to NRC Personnel Involved W/Insp Efforts Re Implementation of Util Comanche Peak Response Team Program1986-11-15015 November 1986 Package of Documents Re Nomination & Authorization for Cash Awards to NRC Personnel Involved W/Insp Efforts Re Implementation of Util Comanche Peak Response Team Program ML20210E5991986-11-0707 November 1986 Rev 2 to Calculation 020-040-M19, Clip Stiffness Production Value ML20210E6811986-10-31031 October 1986 Rev 4 to Calculation M-03, Cable Tray Properties ML20236L8891986-10-31031 October 1986 Rev 1 to CT-1-137-702-S25R, Pipe Support Calculation. Supporting Documentation Encl ML20210E5221986-10-15015 October 1986 Rev 2 to Calculation M-10, Cable Tray - Clip Angle Stiffness ML20210E5751986-10-10010 October 1986 Rev 2 to Calculation M-12, Qualification Procedures for Cable Tray Support Evaluation ML20148F4591986-09-16016 September 1986 Rev 0 to Fatigue Cycle Determination for Pipe Supports ML20148F4921986-09-10010 September 1986 Rev 2 to Documentation of Use of Low Strength A563 Grade a Double Nuts on High Strength SA 193 Grade B-7th D Rod for Richmond Insert Bolt Connection ML20210E6261986-08-31031 August 1986 Rev 0 to Calculation M-28, Justification of Clip Modeling Procedure ML20148F3351986-08-28028 August 1986 Rev 2 to Development of Method for Evaluating Local Stress in Pipe Support Members ML20210E4611986-08-25025 August 1986 Rev 3 to Calculation M-25, Base Plate Prying Action Factors ML20236L9371986-07-31031 July 1986 Rev 1 to Calculation CT-1-032, Texas Util Generating Co Comanche Peak Steam Electric Station Containment Spray Sys 15454-NP(H) ML20211K2971986-06-11011 June 1986 Partially Withheld Package of 850711 & 860611 Lists of Allegations on Comanche Peak 1996-07-17
[Table view] Category:OPERATIONS SUPPORT-CALCULATIONS
MONTHYEARML20116A0341996-07-17017 July 1996 Rev 0 to Temp Vs Distance Profile for 10 RHR Line Containing Stagnant Water ML20128G9491993-01-22022 January 1993 Calculation of Weights Due to Fire Protection Matl ML20128G9551992-12-29029 December 1992 Design Validation of Conduits W/Thermolag ML20128G9861992-10-0202 October 1992 Ampacity of Power Cable Wrapped W/330-660 Installed as Free Air Drop ML20105A7981992-08-14014 August 1992 Rev 0 to Calculation of Thermal Response for Sprinkler & Raceway Supports ML20101G0471992-06-17017 June 1992 Rev 3 to Calculation 2-FP-0085 Raceway & Firezone R Cable Supports Analysis ML20115B6851992-03-0202 March 1992 Rev 0 to 2-NP-GENX-544, Reconciliation of Local Stress Evaluation Using ME215 Analysis ML20104B4001992-02-13013 February 1992 Rev 1 to Calculation RXE-TA-CP1/0-027, Undervoltage/ Underfrequency Reactor Trip Setpoints ML20127H2091991-11-12012 November 1991 Calculation 2-NP-GENX-551, Evaluation of NUREG-0797 Suppl 1A (Sser 14) App a Sections 12.1 & 12.2 ML20082U5851991-05-0808 May 1991 Liner Attachment Welds Serviceability ML20072A8471990-01-23023 January 1990 Rev 2 to Calculation 071, Review Statement for Safety Related Calculations ML20247G4111989-03-31031 March 1989 Transit Time Flow Meter Calculations ML20148F8201988-01-21021 January 1988 Rev 0 to Investigation of SIF for Weld Shrinkage ML20148F8631988-01-21021 January 1988 Rev 1 to Parallel Snubbers ML20148F2151987-11-19019 November 1987 Rev 0 to Potential Binding of Lugs in Axial Supports ML20148F2521987-05-22022 May 1987 Rev 0 to Evaluation of Fluid Transient Cutoff Forces & Development of Screening Criteria for Piping Sys ML20128G9681987-02-24024 February 1987 Cable Ampacity Derating Factors for Conduits Boxed in W/ Thermolag (TSI Product) ML20236L9091987-02-19019 February 1987 Rev 1 to CT-1-137-701-S25R, Pipe Support Calculation ML20207D7481986-12-23023 December 1986 Generic Calculation:Evaluation of Npsi Rear Brackets, Dimension for Design Calculation ML20207D7231986-12-23023 December 1986 Pipe Support Calculation:General Calculation for Richmond Insert/Tube Steel Connections Design Mods ML20210E5991986-11-0707 November 1986 Rev 2 to Calculation 020-040-M19, Clip Stiffness Production Value ML20236L8891986-10-31031 October 1986 Rev 1 to CT-1-137-702-S25R, Pipe Support Calculation. Supporting Documentation Encl ML20210E6811986-10-31031 October 1986 Rev 4 to Calculation M-03, Cable Tray Properties ML20210E5221986-10-15015 October 1986 Rev 2 to Calculation M-10, Cable Tray - Clip Angle Stiffness ML20210E5751986-10-10010 October 1986 Rev 2 to Calculation M-12, Qualification Procedures for Cable Tray Support Evaluation ML20148F4591986-09-16016 September 1986 Rev 0 to Fatigue Cycle Determination for Pipe Supports ML20148F4921986-09-10010 September 1986 Rev 2 to Documentation of Use of Low Strength A563 Grade a Double Nuts on High Strength SA 193 Grade B-7th D Rod for Richmond Insert Bolt Connection ML20210E6261986-08-31031 August 1986 Rev 0 to Calculation M-28, Justification of Clip Modeling Procedure ML20148F3351986-08-28028 August 1986 Rev 2 to Development of Method for Evaluating Local Stress in Pipe Support Members ML20210E4611986-08-25025 August 1986 Rev 3 to Calculation M-25, Base Plate Prying Action Factors ML20236L9371986-07-31031 July 1986 Rev 1 to Calculation CT-1-032, Texas Util Generating Co Comanche Peak Steam Electric Station Containment Spray Sys 15454-NP(H) ML20210E6171986-05-29029 May 1986 Rev 0 to Calculation M-27, Thermal Load Position Paper ML20210E7031986-05-27027 May 1986 Rev 0 to Calculation M-39, Siderail Extension Study ML20148F1131986-04-0404 April 1986 Rev 0 to Justification of Design Load for Struts/Snubbers & Lugs Used in Conjunction W/Riser Clamp ML20210E4911986-03-21021 March 1986 Rev 1 to Calculation M-04, Base Angle Stiffness ML20148F7181982-04-21021 April 1982 Rev 1 to Stress Intensification Factors for Lateral Branches Fabricated from `Welded-In' Piping to Be Used in ASME Class 3 & ANSI B31.1 Pipe Stress Analysis 1996-07-17
[Table view] |
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1.0 INTRODUCTION
This paper describes Texas Utilities Generating Company's (TUGCO) licensing position regarding the evaluation of thermal loading as part of the design verification of cable tray systems at Comanche Peak Steam Electrical Station (CPSES) Units 1 and 2.
Thermal loading was not initially evaluated in the design verification of cable tray systems at CPSES. As part of the Comanche Peak Independent Assessment Program (IAP), Cygna comented that thermal ef fects should be considered where such loads occur. Based on the considerations presented in this paper, TUGC0's position is that it is not necessary to consider thermal loads in the evaluation of cable tray systems.
2.0 BEHAVIOR OF CABLE TRAY SYSTEMS UNDER THERMAL LOADS 2.1 Nature of Thermal Loads Thermal stresses in cable tray systems can be classified as secondary stresses since they are developed as a result of self-constraint and are not generated by external loads. Local yielding, joint slippage, or minor distortions of the system can satisfy the expansion conditions which cause the stresses to occur.
Thermal loading is not significant for cable tray systems due to the O.
' secondary nature of the loads and due to the flexibility of the cable tray systems which can adequately accomodate thermal growth without generating significant loads. The flexibility of these systems results from the high flexibility of the trays and supports in addition to the existence of gaps in bolted splices and clips.
As a result of the above considerations, the general industry practice is to neglect thermal loading in the design of cable tray systems.
4 2.2 Thermal Loading Conditions Two thermal loading conditions exist: To and Ta. To is defined as the thermal loading that occurs during normal operation or shutdown conditions and Ta is defined as thermal loading during a postulated break inside containment.
The maximum temperature change under To conditions is +32 degrees Fahrenheit (Reference [1]). Since this small temperature change occurs gradually, the building structures will heat up at the same rate as the enclosed cable tray systems. Therefore, an effective coefficient of expansion equal to the difference in the coefficients of expansion of steel and concrete can be used to evaluate thermal ef fects. Since the coefficient of thermal expansion of concrete is O nearly equal to that of steel (the difference is approximately 1.0 x
( 10-6) and the temperature change for this load case is relatively small, To conditions will not result in significant thermal loads.
(
, Ta conditions are limited to the reactor building. For this load case the temperature change is considerably higher; however, as 1
mentioned in the following section, it is not required to evaluate Ta conditions for cable tray systems.
3.0 FSAR LOAD COMBINATIONS Cable trays systems are designed for load combinations specified for "other structures" in Section 3.8.4 of the CPSES FSAR (Reference [2]).
The following is a summary of these load combinations as they apply to the evaluation of cable tray systems:
(1) S = D + L + Fego (2) 1.5 S = D + L + To + F,qo (3) 1.6 S = D + L + To+Fegs (4) 1.6 S = D + L + Ta + Fego (5) 1. 7 - S = D + L + Ta + F,qs
- where
- S = required section strength based on the elastic design methods as defined in Part I of the AISC Manual of Steel Construction (Reference [3])
D = dead load L = live load To = thermal loads during normal operation or shutdown conditions i
Ta = thermal loads under thermal conditions generated by the postulated break and including To Feqo = loads generated by half the SSE Feqs = loads generated by the SSE Per Section 3.8.4 of the FSAR, thermal loads do not have to be considered in load combinations (3), (4), and (5) when the material is ductile since they are secondary and self-limiting in nature. Additionally, the overall high system flexibility, including general looseness of connections, prevents potentially nonductile components such as concrete anchors from experiencing thermal loads. Therefore, it is not necessary to evaluate Ta conditions to satisfy FSAR commitments.
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r 4.0 PRECEDENT Based on a review of the FSARs and other design documents, Millstone 3, Braidwood, Byron, and Catawba have not considered thermal loads in the evaluation of cable tray systems. All of these plants are of the same vintage Westinghouse NSSS design as CPSES and share the same licensing position presented herein.
5.0 CONCLUSION
In accordance with FSAR commitments it is not necessary to consider Ta conditions for cable tray systems. Since To conditions will not be significant it is not necessary to consider either thermal load case in the evaluation of cable tray systems. This position has been successfully applied to other plants of the same vintage destgr as CPSES.
REFERENCES
[1] " General Instructions for Cable Tray Hanger Analysis for Comanche Peak Steam Electrical Station No.1 and 2," Revision R2, December 20, 1985, by Ebasco Services Incorporated, i
[2] Comanche Peak Steam Electric Station, Final Safety Analysis Report (Amendment 55, July 19,1985).
v
[3] AISC - Manual of Steel Construction 7th Edition, including Supplements i No.1, 2, and 3.
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