Rev 0 to Clarification of Impell Cth Design Verification Criteria/Methods for Resolution of Cygna Audit Concerns, Analysis of Welds Connecting Base Angles to Embedded PlatesML20215B206 |
Person / Time |
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Site: |
Comanche Peak ![Luminant icon.png](/w/images/d/d7/Luminant_icon.png) |
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Issue date: |
05/15/1987 |
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From: |
Ashley G ABB IMPELL CORP. (FORMERLY IMPELL CORP.) |
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To: |
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Shared Package |
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ML20215B058 |
List: |
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References |
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IM-P-003, IM-P-003-R00, IM-P-3, IM-P-3-R, NUDOCS 8706170256 |
Download: ML20215B206 (5) |
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Category:GENERAL EXTERNAL TECHNICAL REPORTS
MONTHYEARML20211M2981999-08-0606 August 1999 Rev 1 to CPSES Fuel Storage Licensing Rept, CPSES Credit for Soluble Boron & Expansion of Spent Fuel Storage Capacity, Consisting of Revised Title Page and 4-1 ML20210J9391999-06-30030 June 1999 CPSES Commitment Matl Change Evaluation Rept 0003,for 970802-990630 ML20205R5701999-04-14014 April 1999 Rev 6 to ER-ME-067, TU Electric Engineering Rept,Evaluation of Thermo-Lag Fire Barrier Sys ML20151Q1211998-08-14014 August 1998 Rev 0 to Control of Hazard Barriers ML20199J5391998-02-0202 February 1998 CPSES Commitment Matl Change Evaluation Rept 0002 for 960202-970801 ML20198Q7181997-10-24024 October 1997 Rev 5 to ER-ME-067, Evaluation of Thermo-Lag Fire Barrier Systems ML20137D3601997-03-20020 March 1997 Engineering Self-Assessment Rept ML20129F6991996-10-25025 October 1996 Justification for SPC 1986 LBLOCA Evaluation Model W/Interim Adjustment for Non-Physical Behavior ML20100F2761996-02-13013 February 1996 Rev 0 of Engineering Rept, Resolution of NRC GL 95-07 'Pressure Locking & Thermal Binding of Safety-Related Power- Operated Gate Valves.' ML20116M4021996-02-0101 February 1996 Commitment Matl Change Evaluation Rept 0001 for 941101- 960201 ML20095K5411995-12-18018 December 1995 Nonproprietary Small Break LOCA Analysis Methodology ML20094P7971995-11-22022 November 1995 Rev 0 to CPSES Risk-Based IST Program Risk Ranking Determination Study ML20094P7821995-11-22022 November 1995 CPSES Risk-Based IST Program Risk Ranking Determination Study Summary Rept ML20094P4231995-09-29029 September 1995 Pyrolysis Gas Chromatography Analysis of 10 Thermo-Lag Fire Barrier Samples ML20085N2911995-06-21021 June 1995 Individual Plant Exam of External Events for Severe Accident Vulnerabilities TXX-9432, Rev 0 to CPSES Fuel Storage Licensing Rept,Cpses Expansion of Spent Fuel Storage Capacity1994-12-0909 December 1994 Rev 0 to CPSES Fuel Storage Licensing Rept,Cpses Expansion of Spent Fuel Storage Capacity ML20097A3821994-08-19019 August 1994 Individual Plant Exam of External Events,Seismic,Cpses ML20069M8761994-06-10010 June 1994 Engineering Rept Evaluation of Unit 1 & Unit 2 Thermo-Lag Configurations ML20064M6081994-03-21021 March 1994 Engineering Rept Evaluation of Thermo-Lag Fire Barrier Sys ML20059F5431993-10-0505 October 1993 Engineering Rept, Evaluation of Fir Endurance Test Results Related to Cable Functionality in 1-1/2 & 2 Inch Conduits ML18010B0841993-05-0505 May 1993 NRC Licensing Submittal Review of Licensing Conditions Imposed by NUREG-1216. ML20127K8121993-01-19019 January 1993 Rev 0,to Evaluation of Unit 2 Thermo-Lag Configurations ML20126G2121992-12-23023 December 1992 Rev 2 to ER-ME-067, Evaluation of Thermo-Lag Fire Barrier Systems ML20126C0421992-12-18018 December 1992 Suppl 6 to Human Factors Control Room Design Review of Comanche Peak Steam Electric Station ML20126A3621992-12-15015 December 1992 Rev 3 to Receipt,Dispensing,Quality & Insp Requirements for Thermo-Lag Fire Barrier Matls ML18010A9521992-11-30030 November 1992 NRC Licensing Submittal Review of Licensing Conditions Imposed by NUREG-1216. ML20116C9511992-10-27027 October 1992 Individual Plant Exam Submittal:Comanche Peak Steam Electric Station Vol II:Back-End Analysis ML20115D2241992-09-29029 September 1992 Rev 1 to HI-92880, Criticality SE of Comanche Peak Fuel Storage Facilities W/Fuel of 5% Enrichment ML20127C8291992-09-0808 September 1992 Rev 1 to Interim Engineering Rept, Evaluation of Thermo-Lag Fire Barrier Sys ML20114B8051992-09-0101 September 1992 Suppl 5 to Human Factors Control Room Design Review of Comanche Peak Steam Electric Station ML20114C6101992-08-31031 August 1992 Individual Plant Exam Comanche Peak Steam Electric Station Vol 1:Front-End Analysis ML20105A7821992-08-14014 August 1992 Engineering Rept on Thermo-Lag 330-1 Fireproofing Coating Thicknesses Required for 1 & 2 Hour Fire Ratings for Various Structural Steel Members Used by Texas Utils Svcs,Inc ML20105A8471992-08-0606 August 1992 Rev 0 to Comanche Peak Steam Electric Station Unit 2 Engineering Bwip Check Valve 2AF-0083 Failure Investigation ML20116C9621992-07-16016 July 1992 Review of IPE Level 2 Draft Repts for Cpses ML20078H1581992-06-19019 June 1992 CPSES Thermo-Lag Barrier Applications Thermo-Lag Fire Test Conduit & J-Box Test Assemblies. Preliminary Test Results ML20095H2411992-04-13013 April 1992 Validation Efforts for Comanche Peak Steam Electric Station Unit 2 ML20094P3371992-03-26026 March 1992 Control Room Simulator 10CFR55 Certification Initial Rept TXX-9200, RHR Line Summary Rept1992-03-23023 March 1992 RHR Line Summary Rept ML20086E3861991-10-31031 October 1991 Pressurizer Surge Line Transient Justification ML20079D0481991-06-21021 June 1991 Engineering Rept, Testing & Analysis of Commercial-Grade Swing Arms in Borg-Warner Check Valves, June 1991 ML20077E0271991-05-31031 May 1991 Methodology for Reactor Core Response to Steamline Break Events ML20217C4601991-05-31031 May 1991 Reactivity Anomaly Events Methodology ML20073Q8291991-05-17017 May 1991 Small Break LOCA Analysis Methodology ML20084V1401991-03-31031 March 1991 Safety Evaluation for Operation of Comanche Peak Unit 1 W/ Positive Moderator Temp Coefficient ML20079D0571991-03-31031 March 1991 Final Rept on Analysis of Check Valve Swing Arms, Mar 1991 ML20066F4331991-01-31031 January 1991 Draft Analysis of Flow Stratification in Surge Line of Comanche Peak Reactor ML20066L0691990-12-31031 December 1990 Large Break LOCA Analysis Methodology ML20066B2391990-12-31031 December 1990 Control Rod Worth Analysis ML20067B1291990-12-24024 December 1990 Suppl 1 to TUE-1 DNB Correlation ML20062D9041990-11-12012 November 1990 Unit One Loose Parts Monitoring Sys Special Rept 1999-08-06
[Table view] Category:TEXT-SAFETY REPORT
MONTHYEARML20217E8021999-10-0707 October 1999 CPSES Unit 1 Cycle 8 Colr ML20217G4151999-09-30030 September 1999 Monthly Operating Repts for Sept 1999 for Cpses,Units 1 & 2 ML20212F7671999-09-24024 September 1999 SER Granting Relief Request C-4 Pursuant to 10CFR50.55a(g)(6)(i) for Unit 2,during First 10-year ISI Interval & Relief Requests B-15,B-16 & B-17 Pursuant to 10CFR50.55a(g)(6)(i) ML20216J5701999-09-16016 September 1999 Rev 2 to CPSES Unit 2 Cycle 5 Colr TXX-9920, Monthly Operating Repts for Aug 1999 for Cpses.With1999-08-31031 August 1999 Monthly Operating Repts for Aug 1999 for Cpses.With ML20211M2981999-08-0606 August 1999 Rev 1 to CPSES Fuel Storage Licensing Rept, CPSES Credit for Soluble Boron & Expansion of Spent Fuel Storage Capacity, Consisting of Revised Title Page and 4-1 ML20210U4081999-07-31031 July 1999 Monthly Operating Repts for July 1999 for Cpses,Units 1 & 2 ML20210D8321999-07-23023 July 1999 Safety Evaluation Accepting Relief Requests Re Use of 1998 Edition of Subsections IWE & Iwl of ASME Code for Containment Insp ML20209H7661999-07-15015 July 1999 Safety Evaluation Accepting GL 95-07, Pressure Locking & Thermal Binding of Safety-Related Power-Operated Gate Valves, for Comanche Peak Steam Electric Station,Units 1 & 2 ML20209H2721999-07-0909 July 1999 2RF04 Containment ISI Summary Rept First Interval,First Period,First Outage ML20209H2631999-07-0909 July 1999 2RF04 ISI Summary Rept First Interval,Second Period,Second Outage ML20209G7501999-07-0808 July 1999 SER Finding That Licensee Individual Plant Exam of External Events Complete with Regard to Info Requested by Suppl 4 to GL 88-20 & That IPEEE Results Reasonable Given Design, Operation & History of Comanche Peak Steam Electric Station ML20196L0191999-07-0808 July 1999 Safety Evaluation Granting Request Relief B-6 (Rev 2),B-7 (Rev2),B-12,B-13,B-14 & C-9,pursuant to 10CFR50.55a(g)(6)(i).Technical Ltr Rept Also Encl ML20210J9391999-06-30030 June 1999 CPSES Commitment Matl Change Evaluation Rept 0003,for 970802-990630 ML20209G0801999-06-30030 June 1999 Monthly Operating Repts for June 1999 for Cpses,Units 1 & 2 ML20196J0621999-06-29029 June 1999 Safety Evaluation Supporting Proposed Changes to Emergency Plan Re Licenses NPF-87 & NPF-89 Respectively ML20195G5141999-05-31031 May 1999 Monthly Operating Repts for May 1999 for Comanche Peak Steam Electric Station,Units 1 & 2.With ML20216E0711999-05-21021 May 1999 1999 Graded Exercise - Comanche Peak Steam Electric Station ML20206Q0091999-05-14014 May 1999 Safety Evaluation Accepting GL 92-08, Thermo-Lag 330-1 Fire Barriers, Dtd 921217,for Comanche Peak Electric Station,Unit 1 ML20206H2061999-05-0606 May 1999 SER Accepting Exemption to App K Re Leading Edge Flowmeter for Plant,Units 1 & 2 ML20196L2241999-04-30030 April 1999 Monthly Operating Repts for Apr 1999 for Cpses,Units 1 & 2 ML20205R5701999-04-14014 April 1999 Rev 6 to ER-ME-067, TU Electric Engineering Rept,Evaluation of Thermo-Lag Fire Barrier Sys ML18016A9011999-04-12012 April 1999 Part 21 Rept Re Defect in Component of DSRV-16-4,Enterprise DG Sys.Caused by Potential Problem with Connecting Rod Assemblies Built Since 1986,that Have Been Converted to Use Prestressed Fasteners.Affected Rods Should Be Inspected ML20205J7831999-04-0101 April 1999 Rev 0 to ERX-99-001, CPSES Unit 2 Cycle 5 Colr ML20205N3101999-03-31031 March 1999 Monthly Operating Repts for Mar 1999 for Cpses,Units 1 & 2 ML20204H6371999-02-28028 February 1999 Monthly Operating Repts for Feb 1999 for Comanche Peak Units 1 & 2 ML20205N1481999-02-28028 February 1999 Corrected Monthly Operating Rept for Feb 1999 for CPSES, Units 1 & 2 ML20203A4881999-02-0303 February 1999 Safety Evaluation Granting Requests for Relief B-3 - B-6,C-2 & C-3 for Plant,Unit 2 ML20210J9201999-02-0101 February 1999 CPSES 10CFR50.59 Evaluation Summary Rept 0008,for 970802- 990201 ML20202D0101999-01-27027 January 1999 Safety Evaluation Supporting First 10-yr Interval ISI Program Plan Requests for Relief B-9,B-10 & B-11 for CPSES, Unit 1 ML20199E9961998-12-31031 December 1998 Monthly Operating Repts for Dec 1998 for Cpses,Units 1 & 2 ML20207D6091998-12-31031 December 1998 1998 Annual Operating Rept for Cpses,Units 1 & 2. with ML20197K2371998-11-30030 November 1998 Monthly Operating Repts for Nov 1998 for Cpses,Units 1 & 2 ML20195F3161998-10-31031 October 1998 Monthly Operating Repts for Oct 1998 for Cpses,Units 1 & 2 ML20154M8841998-09-30030 September 1998 Monthly Operating Repts for Sept 1998 for Cpses,Units 1 & 2 ML20154B5741998-09-30030 September 1998 Safety Evaluation Re Licensee Response to GL 96-05, Periodic Verification of Design-Basis Capability of Safety- Related Motor-Operated Valves. Licensee Has Established Acceptable Program ML20151W0361998-08-31031 August 1998 Monthly Operating Repts for Aug 1998 for Cpses,Units 1 & 2. with ML20151Q1211998-08-14014 August 1998 Rev 0 to Control of Hazard Barriers ML20237C4061998-08-14014 August 1998 Safety Evaluation Supporting Request to Implement Risk Informed IST Program ML20237C6721998-07-31031 July 1998 Monthly Operating Repts for July 1998 for Cpses,Units 1 & 2 ML20236V3121998-07-29029 July 1998 Final Part 21 Rept Re Enterprise DSR-4 & DSRV-4 Edgs.Short Term Instability Was Found During post-installation Testing & Setup as Part of Design mod/post-work Testing Process. 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[Table view] |
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-CLARIFICATION OF IMPELL CTH DESIGN VERIFICATION ;
CRITERIA / METHODS FOR RESOLUTION OF CYGNA AUDIT, CONCERNS 4
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Analysis of Welds Connecting Base Angles f to Embedded Plates 4 l
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Texas Utilities Electric Company
Impell Corporation 0210-040/041 IM-P-003 Revision 0
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CONCERN: Impell assumes an even distribution of loads in evaluating welds connecting base angles to embedded plates. A concern was raised regarding this distribution
,of loads since the loaded member is attached to the free leg of the angle and, thus, loads could be concentrated in the weld closest to the free leg. l BACKGROUND: The base angles for cable tray hangers are sometimes attached to embedded plates if the plates are . located in .
proximity and if the plates are not occupied by other items within the zone of influence. When cable tray hanger base angles are attached tosembedded plates they !
are usually attached with stitch fintermittent) weld i patterns. Intermittent welds are used for two reasons:
- 1) Continuous welds are not required to attain the ;
necessary design capacity, and, more importantly,
- 2) To avoid problems with warping and residual stresses i in the embedded plate due to excessive heat during j wel ding.
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The typical base angle connection to an embedded plate is shown below in Figure 1.- I I l
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S E~CTION A-A SEcrION 8-8 FI G UR.E 1 2/5 ,
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l impell's procedure for; evaluating'such intermittent welds provides a very conservative analysis' approach.while assuming an equal distribution of loads to' the welds. In Impell's current procedure, loads from the attachment are transformed to loads'at the weld C.G.' considering all the >
, necessary eccentricities land ; increasing applied moments accordingly. The weld 'is treated as a continuous weld pattern of length equal to.the sum of the stitch welds on
~
either side of the base angle'(lesser of 1 +12 1 and.13+14 )
as shown in Figure 2. This provides very conservative weld properties in relation to the properties. achieved through rigorous consideration of the intermittent weld, i
A similar approach is employed for base angles'with .l multiple attachments and/or additional intermittent welds. Impe11.'s analysis procedure again provides a very ~1 conservative analysis approach. Loads from the attachments are either; a) transferrred to one location at the weld C.G. for all . attachments considering the appropriate eccentricities, or b) transferred to the C.G.- !
of the immediate interrittent weld for each attachment.
The weld pattern is then treated.as a' continuous weld considering all of the intermittent welds for case 'a' above or a continuous weld considering only the immediate-intermittent welds for case 'b' above. For case 'b' resultant weld forces are added together directly for -
combined weld stress where-necessary.
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FIG VRE L 3/5 ;
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p .c. m DISCUSSION: Clearly the assumption of an equa1' distribution of loads presents no concern for the applied torsional moment and.
direct shear forces. The. base angles commonly used are very rigid in shear transfer and provide an adequate F
mechanism for an even distribution of the load.-
Similarly, all welds would be effective for. resisting moments applied to the base angle. Increased bending moments resulting from load eccentricities (with respect to weld C.G.) are used'to calculate average stresses in the weld. However, since the force applying direct tension to the welds is located'directly over_ the weld, and since the loaded member is' attached to the free leg of the base angle, the load would be transferred directly to the welds nearest'the free leg. The relative stiffness of the angle.and'the weld is such that a -
mechanism'for transfer of this load to the weld at the toe of the angle does not exist. An even distribution of load to all welds in the tensile direction does 'not appear' appropriate.
However, the procedure employed by Impe11'in evaluating intermittent welds is very conser_vative and offsets any -
stress concentration due to this uneven load distribution. -For the typical configuration presented in-Figure 1 and assuming unit forces and moments in each direction, Impe11's evaluation' procedure predicts. results .
almost identical to those achieved assuming an unequal distribution on tensile loading on the. intermittent wel d. Furthermore, this comparison assumes an equal distribution of loads in each direction. However, the true behavior mode of the cable tray systems results in a much different load distribution. In actual system analyses direct. tensile forces are typically very small-and the critical design concern is applied moments.
Hence, the Impell procedure provides very conservative results as properties for weld resistance to bending are underpredicted significantly.
The typical configuration shown in Figure 1 was evaluated assuming a more realistic distribution of forces and moments. Results of this evaluation indicate thet Impe11's procedure significantly (more than 60%)'
overestimates the resultant weld stress attained assuming an unequal distribution of the tensile force on the weld.
'4/5
r . sn-e-uus-CONCLUSIONS:
Impell's analysis procedure for intermittent welds significantly underpredicts weld properties and provides a j conservative approach to weld qualification. Although the- j direct tensile loading on the weld through the base angle may be distributed only to the weld directly below the free leglaf i the base angle, the conservatisms in Impell's analysis procedure greatly offset the effect of an uneven load distribution.
Therefore, the procedure used by Impell in evaluating the weld of base angles to embeddment plates provides a conservative method of determining average stresses on the weld material, i
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d 5/5