ML20126K768

Forwards Part of Earlier Submittal by TU Electric for Distribution as Was Done for Previous Submittal Re ME215 Sapcas Computer Code.Proprietary Abstract Also Encl.Abstract Withheld

ML20126K768
Person / Time
Site:	Comanche Peak
Issue date:	12/24/1992
From:	Peyton E NRC
To:	Mcknight J NRC
Shared Package
ML19303F169	List: ML20126K768
References
NUDOCS 9301070247
Download: ML20126K768 (1)

Text

.

~. _

..Jo' T

m. _

December 24,. 1992 Note to Jim McKnight:

The attached is part of an earlier submittal made'by TU Electric. Please make-the same distribution for this as was done for the previous submittal. I have also enclosed a copy of the RIDS sheet that-shows the distribution and

, subject. If you have any probless or questions,'please give me.a call.

Thanks.

0 b ovd ..

Eileen Peyton 504-1305 -q

'l I

[

. }ff 1 0-O.

.g d (E h$lb A

On. u o&O gc,

~

.9301070247 921224 PDR- ADOCK 05000446:

- A. PDR q

, e' I

mamammemamme

==

. Log # TXX-92353 r = File # 10010 (clo) it/ ELECTRIC August 12, 1992 W1111am J. cam 11, Jr.

Group Vice PrrsideM U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555

SUBJECT:

COMANCHE PEAK STEAM ELECTRIC STATION (CPSES) - UNIT 2 DOCKET NO. 50-446 REQUEST FOR ADDITIONAL INFORMATION ON ME215.

SAPCAS COMPUTER CODE Gentlemen:

Per your request for additional information on the subject computer codes, the following enclosures are provided for your review as follows:

(1) Introduction of computer program HE215. This write up provides a brief description of the three documents included in this transmittal.

(2) The " User and Theory Manual" (proprietary)

(3) The ' Validation Manual *, computer outputs of validation problems are not included in the verification manual. (proprietary)

(4) Comanche Peak No. 2 GEHX Calculation No. 2-NP-GENX-544. This GENX calculation is prepared to resolve the technical issue regarding the automatically generated element size at the pipe near a pad, This GENX calculation satisfactorily resolved the concern.

(5) The response to the NRC's questions arising from the review made at Bechtel's Gaithersburg of fice.

(6) A complete copy of microfiche of HE215 and ANSYS output (total 49 sheets). (proprietary)

(7) Bechtel Application for Withholding Proprietary Information with Accompanying Af fidavit, Proprietary Information Notice and Copyright Notice.

As portions of this submittal contains information proprietary to Bechtel, it is supported by an affidavit signed by Bechtel, the owner of the information. The affidavit sets for o the basis on which the information may be withheld f rom public disclosure by the Commission and addresses with specificity the considerations listed in paragraph (b)(4) of 10CFR2.790.

9 m u m a7 920e12 PDR gpI g/g /g /b4 ur/ Cel. 9g' ,

O ADOCK 05000446

. ._ PDR 4ao N.ouve Sucet LB. 81 Has, Texas 75201 /b / /#[

Sg

m TXX-92353 Page 2 of 2 Accordingly, it is respectfully requested that the information which is proprietary to Bechtel be withheld from public disclosure in accordance with 10CFR2.790. Correspondence with respect to the proprietary aspects of the Application for Withholding should reference the supporting Bechtel affidavit and be addressed to Mr. G. L. Lusbaugh, Bechtel Project Engineer, Comanche Peak Steam Electric Station, P.O. Box 1002, Farm Road 56 Mail Zone C07, Glen Rose. Texas 76043.

Sincerely, Y h* ,)f William J. Cahill, Jr.

By: M e Roger D. Walker Manager _of Regulatory Affairs for NEO CEJ/tg Enclosures c- Mr. J. L. Hilhoan, Region IV w/o encl Mr. B. E. Holian, NRR, w/ encl Resident Inspectors, CPSES (2) w/o enci l

I i

1 EHCLOSLRE 1 TXX-92353 INTRODUCTION OF COMPUTER PROGRAM ME215, VERSION 1.0

1. INTRODUCTION hE215 is-a special purpose finite element computer program for calculating the membrane and membrane-plus-bending stress intensities (S.L) at pipes, pads, attachments, and welds. The piping components can be a circular run pipe, elbow, or a square tubular steel. The attachment can be a circular pipe, rectangular tube, or rectangular solid lug.

The structural analysis solver of the ME215 program is based on the SOLID SAP and SAP-IV. ME215 element library contains quadrilateral plate element of SAP-IV,3D solid (brick) element of SOLID-SAP, and 3D beam element of SAP-IV.

The program utilizes a minimum set of free format, engineering based input commands and keywords. It then automatically generates a finite element mesh to model the user defined piping attachment. Some control parameters are available for the user to adjust the modeling of the attachment. By default, the minimum element size at the attachment interface will be about the run pipe thickness, or the pad thickness if applicable.

Local stress calculations for Comanche Peak Unit 2 integral welded attachments are evaluated and qualified using computer program ME214. ME214 is based on the Welding Research Council (WRC) Bulletin No.107, ASME Code Cases, and l Comanche Peak Design Criteria 2EP-5.12 and 2EP-5.13. If a local stress

~

calculation can not be qualified using ME214 due excessive conservatism or if the attachment being evaluated is beyond the program limitations, then ME215, if applicable, may be used for the qualification of local stress calculation. ME215 will provide a realistic solution of local piping stress as compared to the more conservative approach used in computer program ME214. '

-2. USER AND THEORY MANUAL He user and theory manual of ME215 provides the following infortnatiom l a. Heoretical basis of the computer program and its references.

b. Program capability, limitation and assumption.

c. Preparation of input data -

• Defines the coordinate systems c:\rpc4\m21(,m i

• Identifies the geometric con 5guration of integral welded attachment on a run pipe

• Describes the attachment / pipe dimensions

• D(scribes load input

d. Output Interpretation l

• Describes the format of output. Two tables listing the maximum 25 stress l points are reported for the whole finite element modet One table is sorted according to the membrane plus bending stress intensity and the other according to the membrane stress intensity.

• Printouts of model geometry, nodal displacements and rotations.

• Printouts of the detailed element stresses for each plate or brick elements.

3. VALIDATION MANUAL Re ME215 Validation Manual revision 0 covers 14 validation problems. A checklist explains which of the various features were validated by each of the validation problems. The validation problems are numbered as VER E1. VER-E2, . VER-B1,. VER-A1, etc. De problems selected are based on their numerical sensitivities, system characteristics, unique features, available solutions, program capacities, built-in criteria, defaulted values, etc. - In this report, ME215 results have been compared against the commercially available computer program ANSYS, simplified closed form or conservative methodology, the standard benchmark problem from the ASME and/or other technical publication.

Tables or charts show typical values extracted from the ME215 computer output compared with the results from one of the references listed in the previous section. The results compared are typical of the results for numerical figures l ranging from low to high values for these problems.

4. GENX CALCUIATION 544 - Reconcillation of Iacal Evaluation Using hE215 l Analysis l In the ME215 analysis, the element mesh size is generated automatically. During l a TU audit on ME215, it was concluded that the generated element sizes are adequate at welds, attachments, pads, and piping near attachments. However, a concern was raised relative to the adequacy of the element size at the pipe near a pad.

c:\rpt4\m215,m

(

-o

- To ar.sess this concern a'GENX calculation was prepared in which the adequacy of ME215 mesh size in this region was addressed further using additional comparisons with ANSYS. De GENX calculation demonstrates the acceptability of usage of ME215 relative to the concern raised.

5. FUTURE , PROGRAM RELEASES Version 2.0 of the program (currently being documented) will further enhance the automatic mech generation feature for pipe elements near a reinforcement pad.

Options to vary the. size of elements will also be available. De preliminnry validation runs of version 2.0 show close correlation with the results of ANSYS.

The new version of ME215 is intended for issuance in the near future.

I 4

i c:\rix4\m2c_m

EW1(ISURE 4 FIGU AE 7.1 TXX-92353 3EP4ce CALCULATION TITLE PAGE AEvlSION 2 PAGE 1 CF t TEXAS UTIUT1ES ELECTRIC CO. / CPSES UNIT 2 PAGE1 TCTAL Nc1 CF Pacts _32, CALCUuTION TTTLE (Indicettve of the Objective)

CALCULAT)ON CLASSIFCATICNS FICO!!CILIATION OF LOCAL STPISS EVALUATION USING ME215 ANALYSIS G CLASS I or il

4. C3 NCH SAFETY CALCULATICN ICENTIFICATICH bCANIZATICH:

CALCULATION NUMBER TYPE BECHTEL,PSAS NUMBER Psc2

~

2-NP-GENX-544 VPST NUMBER COMPUTER CUTPUI SYSTEM / SUS SYSTEM (CM YES @ No O WPN 2 9 D ATTACHED yEs n NO R APPRCNAL.S . PRINT NAME. 53GN. AND OATE CHECKER (3)/ APPRCNAUSy SUPPLEMENT 3/ CONFIRMATION PREPARER (S) REViswM I REY.NG SU N REcutRED

[ENI' (TYPE /M a_' / REY.)YES

!!.Y. Chow No J. . Shen 0 c, wig w g c,,wgcw N/A X

[ /

Gb

• 2/21/H El9 %hu R.C.Ullkinso H.Y. Chow Ad *

'Yf* }/ Q 2 /28 / 92 i

CISTRIBtmON:

5 5

m 2EP4061. REVISION 2 j AECCRO TYPE COCE: 5A.1 c0 e 25 %

.9310160197-920812 ';

DR ADOCK 05000446 37(,/y PDR

Revision-2 Page 1 of 1*

FICUhE 7.4 COMPUTER OUTPUT / CROSS REFERENCE ORCANICATION- B ECHTEL DSAS

'OB NO. 20935 CALC NO.: GENX-544 __

, ggy, O pggg 2 i

COMPUTER RUN UNIOUE IDENTIFIER fIJOBDATE PROC. NAME2 VERSION / LEVEL 2 I,

LIBBARY NAME2 COMPUTER ADD /

tJOB DELETI 8-29-91 NUM B '.R*

ME215 0 8-29-91 S2$0080s(ME10lTEST) D14812 ME215- 0

- Ditto - TIO254 8-29-91 ME215 0

- Ditto - TD0106 8-28-91 ME215 0

- Ditto - SR5507 9-20-91 ME215 0

- Ditto - KD5727 9-19-91 ME215 ,

0 -

Ditto - JW5555 9-19-91 ME215 1 0 -

Ditto - JQ2058 l 9-19-91 ME215 0

- nittn - JU3147 9-19-91 ME215  !

0

- Ditto -

" dor unique 'identitication numoer JC3800

1) Mandatory

2) Optional, as appropriate More cceputer Run Listing on Next i CROSS REFERENCE CALC. TYPE ,

CALC. NUMBER REVISION '

ADD / DELETE I

[

2EP-5.08-3, Revision 2 Roc. Type Code: 5A.100

2EP-5.08 Revisica 2 Pago 1 of l' I l

1 FIGURE 7.4'  !

COMPUTER OUTPUT / CROSS REFERENCE ORCAN!!A!!ON: '

CALC NO.: ._ GENX-544 JOB NO. ._

• REV. O pygg _3 l

COMPUTER RUN UNIOUE IDENTIFIER -s IJOB DATE PROC. NAME2 VER5 ION / LEVEL 2 LIBRARY NAME2 COMPUTER A00/

tJOB DELETE 9-19-91 ME215 0 NUMETR*

$2 SDUB0 : (ME10lTEST)

JM0400 9-23-91 ME215 0 - Ditto - NH3450 9-19-91 ME215 0 - Ditto - JO2937 l

9-19-91 ME215 0

- Ditto - 1JO3032 9-19-91 ME215 O

- Ditto - JQ5852 9-21-91 ME215 0 l

- Ditto - LE3805 9-21-91 ME215 0 _.

- Ditto - LH1942 9-21-91 ME215 0

- Ditto - LJO943 9-23-91 ME215 0

- Ditto - NH5149 vor unique idenC1f1C4C10n nuacer

1) Mandatory

2) Optional, as appropriate More Computer Run Listing on Next Pg.

l CROSS REFERENCE

- CALC. TYPE i =

CALC. NUMBER REVISION ADD / DELETE I

i i

l l

l l 2EP-3.08-3, Revision 2 Roc. Type Code: 5A.100

2EP-5.08 Revision 2 Page L of 1 ,

FICURE 7.G COMPUTER OUTPUT / CROSS REFERENCE ORCAN! ATION: '

CALC NO.: JOB NO.

CENX-544 _

- REV. _ o PAcg _4 l

=

COMPUTER RUN UNIOUE IDENTIFIER tJOB DATE PROC. NAME2 VERSION / LEVEL 2 LIBRARY NAME2 COMPUTER '

ADD /

1 JOB D E'.,ET E 10-01-91 ME215 NUMl!iR*

! O 10-01-91 S2SDUB0 time 101 TEST) 1U0752 ME215 0 ,

- Ditto - iP1906 9-19-91 ME215 0

- Ditto - JF0336 9-18-91 ME215 0

- Ditto - Iv2129 10-01-91 ME215. -

- Ditto - lW2737 9-20-91 ME215 i 0

- Ditto -

9-19-91 ME215 KB4623 0

- Ditto - JA0450 9-20-91 ME215 0 l - Ditto - KC5149 r q tdentification nussoar

2) Optional, as appropriate More Computer Run Lis:ing on Next Pg.

CROSS REFERENCE CALC. TYPE CALC. NUMBER REVISION ADD / DELETE i.-

2EP-3.og.3' ' vision 2 .

l Rcc* TYPE Code: 5A. loo j

2EP-5.0a 5 Revision 2 Page I of l' FIGURE 7.4' COMPUTER OUTPUT / CROSS REFERENCE ORCAN!!ATION: BECHTEL,PSAS

.gg gg,20935 CALC NO.:

GENX-544 _

REV. _0 pAcg _ 5 p

i __

COMPUTER RUN UNIOUE IDENTIFIER -m f1JOBDATE PROC. NAME2 VERSION / LEVEL 2

[, LIBRARY NAME2 COMPUTER ACD/ 1 1 JOB CELE E 8-30-91 ANsys NUME'IR*

i 4.4A 9-28-91 t wo0 AB AUGH. ME10ll 120845

( ANSYS 4.4A f

- Ditto - 174535 10-03-91 MISYS 4.4A -

- Ditto - 130136 I

' dor unique'LdenCLI1 Cat 10n numDer

1) Mandatory

2) Optional, as appropriate CROSS REFERENCE CALC. TYPE '

CALC. NUMBER REVISION ADD / DELETE u

2EP-3.08-3, Revision 2 Rec. Type code: 5A.100

y CALCULATION SHEET

-. CALC.NO PROJECT COMANCHE 2-NP.GENX-544 PEAK STEAM ELECTRIC STATION. UNIT 2

_ JOB NO. 20935

Subject:

. REV. Q., PAGE - 6 Reconciliation on Local Stress Evaluation Using ME215/Anah sis TABLE OF CONTENTS

~

TITLEPAGE........................................................................................ 1.

CO M P UTER O UTP UT/C ROS S S ECTIO N . . . .. . .. .2 .... . . .

TA B LE O F CO NTENTS . . .. . . . . . . . . . . . . . . . . . . . . . . .6. . . . . .

1.

PURPOSE......................................................................................... 7 2.

BACKGROUND................................................................................. 7 3.

EVA L UATION M ETH O D . . . . . . . . . . . . . . . . . . . . . . . . .9 . . . . . .

4 R ES U LTS/ CONC LU S ION S ..... .... . . .. . ................ . ..11 . ..... .. .

5.

M ETHO D OF R ECO NCIUATION .................................................. 14 6.

RECONCIUATION OF EXISTING ME215 ANALYSIS ..................... 16 7.

TA B LE AN D FI G U R ES . . . . . . . . . . . . . . .. .. . . .. . . ..17. .. .. . . .

8.

R E FE R E N C ES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 ........

ATTA C H M E NT A ' . . . . . . . . . . . . . . . . . . . . . . . . . . . 7. pages ..........

1 9

ORIGINATOR CHECKER uv cuw T k. SAon Paj Ul - Z s' R.F W:lf a nn WY Md -

?"J A'~^]

CALCULATION SHEET i '

PROJECT CALC.NO COMANCHE 2 NP4ENX444 PEAK STEAM ELECTRIC STATION-UNIT 2__ JOB NO.

20935

Subject:

REV.._0. PAGE 7 Reconciftation on Local Stress Evaluation Using ME215 Analysis 1.0 PURPOSE The purpose of this generic calculation is:

(1) To evaluate the adequacy of the pipe element size generated by ME215 automatic mesh generator near a pad area.

(2) To establish a methodology of using ME215 results for local stress evaluation if the pipe element size is determined not to be adequate.

(3) To reconcile previously completed ME215 analysis results, if required, against the methodology established in this generic calculation.

2.0 BACKGROUNQ 2.1 When integral Welded Attachments (IWA's) are evaluated using ME215 analysis, the basic evaluation procedure is as described below:

(1) Modelino The size / dimensions of the attachment, the run pipe and the pad, if exists, are modelled to represent their actual dimensions. For IWA's with an all around pad, an equivalent pipe with the pad thickness and OD dimensions may be used to represent the pad and the run pipe if following requirements are met:

The pad size meets the minimum edge distance requirement of Section 5.2.1.2 or 5.3.1.2 of 2EP 5.12. That is:

L, > L,

• 2 Q where L,, R, and T, are the length, outside radius and thickness of the reinforcing pad, respectuely, L, is the attachment longitudinallength The attachment is welded to the pad, and it's centeriine coincides with the geometric center of the surface of the pad.

The pad weld is not less than 1.09 times the nominal thickness of the pipe.

CALCULATION SHEET PROJECT CALC.NO COMANCHE 2-NP-GENX-544 PEAK STEAM ELECTRIC STATION-UNIT 2_ JOB NO. 2093

Subject:

REV. O PAGE B Reconciliation on Local Stress Evaluation Using ME215 Analysis (2) Allowable Stresses Material allowables (S, Sn , S., Sy ) used may be based upon the material of the item for which a stress evaluation is being made, rather than the lowest of all. Additionally, the allowables and the methodology used for weld evaluations may be based on ASME Code Cases N-318 and N-392.

(3) Local Discontinuity Stress Evaluation The local stresses at attachment to-pad and pipe-to-pad junctions are checked. The maximum attachment, pad and pipe stresses are checked against the allowable stresses of each respective item. These local stresses at attachments and pads are directly found from ME215 results.

The local pipe stress at the pipe to pad is taken as the t.kjher of the stresses calculated at the pioe/ pad interface (i.e., representing the weld) or the pipe stress from ME215 results. For IWA's with an all around pad, when the ' equivalent pipe model* method is used, the stresses at pipe--

to-pad junction are calculated by using the stresses intensification factor for a fillet weld connection and pipe moments at each respective juncture.

(4) Pad Weld 9tresa Pad welds are qualified per Attachment 4-2 of 2EP-5.13. The pipe / pad interface (weld stress) from the ME215 output are not used for weld qualification. The higher of the pipe / pad interface (weld stress) or the pipe stress from ME215 resutts is considerad es pips !ccel shess and used for IWA local stress evaluation. '

2.2 In the ME215 analysis, the element mesh size is generated automatically.

The generated element sizes are adequate at welds, attachments and pads.

However, the element size at the pipe near a pad is relatively coarse and hence may result in less conservative calculated stresses. This only occurs when the welded attachment has a reinforcing pad and the pad is:

' - not a wrap around 360 degree pad, or

- a wrap around 360 degree pad but the 'equivaient pipe model" option is not chosen l

2.3 With the exception of the relatively coarse pipe element near a pad, analyses using ME215 computer program are conservative in the following manner:

l

CALCULATION SHEET PROJECT COMANCHE PEAK STEAM ELECTRIC STATION-UNITjL JOB NO. 20935 CALC. NO 2-NP-GENX-544

Subject:

_. REY. O PAGE 9 Reconciliation on Local Stress Evaluation Using ME215 Analysis ~

(1) in performing ME215 analysis, two loading conditions are considered for each load case. One loading condition applies three moments f

simultaneoush . The other condition applies three forces simultaneously.

5 The total calculated stresses are the absolute summation of the calculated stresses from these two loading conditions. Thus the potential counteracting effect of the actual combined stresses from forces and moments are avoided, in addition, the maximum calculated stresses from these two separate loading conditions are assumed to occur at the same location (element).

(2) ME215 model does not consider the interacting effect between a pad and the pipe. The applied load is transmitted from the pad to the pipe through the pipe / pad interface (weld) only. There are no gap elements between the pipe and the pad which would provide for the pipe to directly share some of the applied loads. This tends to maximize stresses on the pad weld and the local pipe area surrounding the pad weld. For simplicity, the stresses in the FEA model in the area of the pipe / pad interface are referred to as the ' weld stresses"~even though they are not used in the weld evaluation.

(3) The higher of the weld stress or the pipe stress from ME215 results is used to represent the local pipe stress in that area. The weld stress is typically hounding when the pad weld size is smaller than the nominal pipe wall thickness. When the pad weld size is greater than the pipe wall thickness, two or more layers are usually specrfied for the pad weld in the ME215 analysis model. Since the higher of the weld stress or the pipe stress is used, the calculated pipe stresses by ME215, are not expected to be relevant to the local stress evaluation since the weld stresses typically control.

(4) The pipe minimum nominal stress (MNS) is combined with the pipe local stress calculated by ME215. In the ME215 analysis model, both ends of the run pipe are assumed fixed. For anchors, this resutts in calculated local stresses which irx:!ude the effect of the moments of the nan pipe from both sides of the anchor. Thus, the pipe MNS stresses are over-

.- accounted for in the final stress evaluation.

3.0 EVALUATION METHOD The method of evaluation of the pipe element size, when pads are used, uses the following approach:

(1) Determine whether the calculated local stresses at the pad to-pipe weld i would be goveming for that location in all cases.

CALCULATION SHEET PROJECT COMANCHE PEAK STEAM ELECTRIC STATION-UNIT CALC.NO __ JOB NO.220935 2-NP GENX444 '

Subject:

_ ' REV.__Q,,,,_PAGE - 10 Reconciliation on Local Stress Evaluation Using ME215 Ar'alysis (2) The maximum stresse' s. (the higher of the weld stresses or the pipe local stresses), at pipe / pad Junction, calculated by ME215 are compared to ANSYS results at pipe elements to establish the level of conservatism in ME215 analyses.

(3) Establish a method of reconciliation of the ME215 analysis results if the results of items conservatism. 1 and 2 above could not establish an overall level of Two basic F.E. models are used to perform this evaluation. One model represents the case in which the sir of the pad weld is smaller than the pipe wall thickness. The second modeliepresents the case in which the size of the pad weld is greater than the pipe wall thickness. In each of the two basic models the other parameters are selected such that the stresses on the pad / pipe juncture are maximized. The pad thickness is taken to be thicker than the pipe wa!! thickness and the pad length is such that the dietance between the surface of the attachment and the edge.of the pad is less than decay length

/ G. The actual pipe and pad size used in the analyses are:

Pipe outside diameter: 3.5'; Thickness of the pipe: 0.216" Pad size:

6* (length) x 7" (180 degree) x 0.75' (thickness) t in ANSYS analyses, gap elements are used between the pad and the pipe. Th pipe element size near pad weld is 0.25" (compared to /Fr of 0.615") which is small enough so that the calculated local stresses are realistic.

ME215 Models In variations of different pad weld element mesh size and loadings on the two basic models dW=d above, a total of five (5) configurations and twenty-six (26) separate load cases as shown in table 7.4 are used to perform the ME215 analyses. In the five (5) configurations three (3) configurations are for %" pad weld size with 1, 2, and 3 No.. of layers and two (2) configurations are for 3/1s*

pad weld with 1 and 2 No. of layers. The higher stresses of pad welds or pipe elements from ME215 results are compared to those of pipe elements from comparable ANSYS results. Among the twenty-six' load cases used, eighteon (18) load cases are used for the purpose of direct comparison of the results, three (3) load cases are used for the purpose of validating the proposed 4 reconciliation method and the remaining five (5) load cases are used for both purposes as shown in Tables 7.2 and 7.3 of Section 7.0.

m O

9

.m-- n- - - - . , . , . , , , ., ,, ,, , -, , -

CALCULATION SHEET PROJECT 2-NP4ENX444 CALC.NO COMANCHE PEAK STEAM ELECTRIC STATION-UNIT 2_ Jo _.

Subje':t: _ _., . . REV.,3,_.PAGE 11 Reconciliation on Local Stress Evaluation Using ME215 Analysis _

ANSYS Models i

Since pad weld mesh size has littla effect on the stresses at pipe element one pad weld element mesh size (one layer) is used in the ANSYS models. The type of element used is STIF45-3D Isoparametric element. Thus, the number of configurations analyzed by ANSYS is limited to the two basic models discussed above. Twelve (12) load cases are used in conjunction with the ANSYS models which are sufficient to compare to those described for ME215 analysis above.

See table (7.4) for cross referencing of ANSYS to ME215 load cases.

4.0 RESULTS/ CONCLUSIONS f

4.1 Comparison of ANSYS and ME215 Analysis Results i

4.1.a Comparison of Local Membrane Stress intensity, Sl(M)

The results from the twenty three (23) load cases from ME215 analysis are compared to the results from the corresponding ten (10) load cases of ANSYS analyses in Table 7.1 of Section 7.0. ME215/ANSYS '

stress ratios as high as 2.141 are indicated by the table. These j indicate that ME215 provides more conservative beal Membrane

Stress intensities Sl(M) than ANSYS for all cases except in the load case where three forces of Fx = Fy = Fz = 1000 lbs are applied. In .

this case, the results of ME215 are slightly less conservative (stress ratio of ME215/ANSYS is 0.950). The results of this comparison are reasonable because:

(1)

Local membrane (across wall) stresses decay much; slower than

< bending stress (page 471 of Ref. 8.4). Thus, the element size i has little effect on the membrane stress than on the bending

< stresses.

h (2) The pad and pipe wall interact with each other in the normal direction, thus, consideration ci the interaction effect in ANSYS (using gap element) reduces local membrane stress, Sl(M).

4.1.b Comparison of Membrane Plus Bending Stress intensity, Sl(M+ B)

For the load cases evaluated, the higher of the membrane plus 1 bending stresses at pipe or pad weld element from ME215 analysis

are compared with the corresponding load cases at pipe element from ANSYS analyses. The resub are shown in Table 7.2 of Section 7.0.

in general, the ratios of MEz15 (enveloped pipe and pad weld)/

ANSYS (pipe) local stresses in the pad-to-pipe juncture area is either-

--g,v,c. -,m.,,,,4, u r .- - w ,+ v ,,,--s,e,,.vw,.,,,--v.-- ,w. m ,w ,r---..~..-

CALCULATION SHEET-I- '

PROJECT COMANCHE CALC.NO 2-NP-GENX 544 PEAK STEAM ELECTRIC STATION-UNIT 2_ JOB NO.

20935

Subject:

REV. O PAGE_ 12 Reconciliation on Local Stress Evaluation Using ME215 Analysis greater than or slightly below unity, for combined forces, and combined moments, when these combined forces, or moments are constituents of equal values. Table 7.2, however indicates that for individual moment components, the ratio varies, with ME215 pad weld results underestimating the local stresses at the pipe based on ANSYS by up to 26.6% for the My direction of moment. ME215 results for the pad weld stress for the other moment directions are consistent with those from ANSYS. It is therefore concluded, that the ME215 results may underestimate the pipe wall stresses if the My component loading dominates those from the other moment direction, Thus, a reconciliation methodology is developed and included in this GENX to provide guidance on reconciliation and use of ME215.

The following discussion pertains to relevant aspects of this comparison:

l i (1) The effect of the gap on the interaction between the pad and the pipe has greater beneficial results under the circumferential moment loading than those under the longitudinal moment loading because the interacting normal force between the pad and pipe can share the loads more effectively for the circumferential moment loading case than for the longitudinal moment loading case.

(2) The pad size was purposely selected much thicker than the pipe, the beneficial effects of the gap in the ANSYS runs are minimized.

In real applications, the ratio of the pad thickness to the pipe wall thickness will be smaller than those use in this GENX.

(3) The membrane plus bending stress intensities, Sl(M +B), from ANSYS results are calculated from the element surface and have not been linearized (across solid wall section) while those from ME215 results have. In ME215, the two stress components which exhibit bending characteristics along the class lines (across wall thickness) are linearized. The linearized stresses at discontinuity location, in general, are lower than the corresponding surface (non-linearized) stresses. Therefore, the maximum stress ratios reported in Table 7.2 of Section 7.0 are more conservative than i* those stress ratios were based on uurface (non-linearized) stresses from ME215 results. In the analysis model considered in this evaluation, one layer is used for the pipe wall elements. For pipe wall made up of one layer, the difference between the linearized stress and the surface stress is minimal.

{

n .

CALCULATION SHEET.-

PROJECT CALC,NO COMANCHE 2.NP.twNX-544 PEAK STEAM ELECTRIC STATION.20935 UNIT 2 ' JOB NO. 1 Subjecti REV. -0 'PAGE -13 -

Reconoliation on Local Stress Evaluation Using ME215 Analysis _

(4) - ' Since the local stresses _ calculated per the project criteria ~ are combined stresses which include the local effect and pipe stress J (MNS), the combined stress ratios (ME215+MNS/ANSYS+MNS, ME215+MNS/ANSYS) are calculated and shown in Tables 7.1 and 7.2. Stress ratios of combined _ stresses'(ME215+M ANSYS+MNS) indicate that the maximum difference betwee two methods was reduced to 15.6% (as shown in Table 7 fact, the results of both ANSYSland ME215 ' analyses have

=-

already included the effect of pipe stresses (MNS)(Therefore, the adequacy of ME215 approach may be ~ demonstrated based '

on the stress ratios of ME215+MNS/ANSYS as shown in Table 7.1 and 7,2.11t is noted that in this case all stress ratios from moment loading are greater than 1.0, which indicates that the; overall ME215 analysis approach (see section 2).is conservative 4

and adequate.

As shown, the ME215 results.are, in general,;very conservative except-under longitudinal moment loading. Ths stress ratios under longitudinal moment loading are not as conservative as those under other loadings.1This underconservatism,'is however outweighed by L the fact that the analysis' approach overaccounts for the MNS. in order to provide additional conservatism for ME215 approach,-it.is -

recommended.that the results of ME215 be adjusted in accordance - ~

with the approach suggested in Section 5.0cwhen the longitudinal moment load are dominant over torsional or circumferential moment 4.2 Conclusion p

The local m6(ribrene stresses from ME215 unalysis results under moment

' loadings are conservative. -The contribution of the local stresses from ?3 -

forcestis small compared to those from moments, therefore, the local stresses evaluation for those code' equations using ME215 analysis results!

are valid with no reconciliation required.

- The membrane plus bending stresses Sl(M+B), from ME215 analysis results

- are in general reasonably conservative. .However, if the co6dnJtion from : '

the longitudinal moment loading is dominating, the calculated membrane plus bending stress'using ME215 results at the pad weld to represent thei ~

piping local stress may be less conservative. a To ' ccount for;the possibilit L

of this unconservatism, die ME215 membrane plus bending stress results

- should of this GENX. be reconciled in accordance with the method outlined in Se y -# w ye -. ,p q- w .-w,- g- v~ 3- y e. < -e g w.-e-._-,-..-~

CALCULATION SHEET PROJECT CALC.NO COMANCHE 2-NP-GENX-544 PEAK STEAM ELECTRIC STATION20935 UNIT 2_ Jos NO.

Subject:

REV. 0 -PAGE 14 Reconciliation on Local Stress Evaluation Using ME215 Analysis 5.0 METHOD OF RECONCILIATION 5.1 IWA local stress evaluations using ME215 analysis need not be reconciled if one of the following conditions exist:

(1) The IWA does not contain a reinforcing pad.

(2) The ME215 analysis results are not used for evaluation of code equations 10 or 11, or if used, the margin to the allowable of Eq.10 or 11 for pipe or pad weld element is 40% or more (i.e., allowable stress / combined local stress 21.4).

(3) The reinforcing pad is a wrap around 360 degree pad and the

' equivalent pipe model' as described in Section 2.1 is used in the ME215 analysis.

5.2 If the conditions of Section 5.1 above are not met, the ME215 analysis shall be reconciled in accordance with the following procedure (see figure 1 of attachment A):

(1) Calculate modification factor R, R = l(RM).Mf * (RM).Mf * (RM).Mfll(M) + (M) * (Mf where: .

R(M,), R(M y ) and R(M,) are the maximum stress ratios of ANSYS/ME215 results from table 7.2, considering the No. of layers modeled, and the relationship between the weld size and the pipe wall thickness.

The maximum stress ratios for the %' pad weld size model shall be used for those IWA's with pad weld sizes greater than or equal to the pipe wall thickness and the 3/te* pad weld size model results shall be used with IWA's pad weld sizes smaller than the pipe wall thickness.

M,, Myand M, are the circumferential, longitudinal and torsional moment loadings in the direct'ons defined by figure 7.1.

(2) If the calculated modification factor R value is less than or equal to one (1.) the ME215 analysis results are conservative, and no reconciliation or further adjustment is necessary. Otherwise continue step (3).

CALCULATION SHEET L.

PROJECT CALC.NO COMANCHE 2-NP-GENX.544 PEAK STEAM ELECTRIC STATION UNIT 2_ JOB NO.

20935-

Subject:

REV. O PAGE 15 Reconcillat>on on Local Stress Evaluation Using ME215 Analysis (3) Calculate the modified ME215 membrane plus bending local stress, S, by:,

S = S (force) + R

• S (moment), where S (force) and S (moment) are ME215 calculated enveloped maximum membrane plus local bending stresses at pipe and pad weld element under '3 force' and '3 moment' loadings used in the Equation 10 (or 11) evaluations. This modified local stress S shall then be combined with the pipe minimum nominal stress (MNS) in accordance with project procedure to check against the code allowables.

Examples of calculating the modified local stresses for the '3 moment" loading are given in Table 7.3 of Section 7.0. The calculated modified local stresses are compared to the ANSYS results due to the same '3 moment" loading. For the load cases considered in Table 7.3 of Section 7.0 the modified ME215 stresses are all conservative compared to the corresponding ANSYS results. Table 7.3 demonstrates that the modified local stress using this reconciliation method is conservative.

Although the method of reconciliation derived in this generic calculation is only based on limited finite element analysis data, it is, nevertheless, considered to be sufficient for following reasons:

(1) Inherent conservatism in the ME215 analysis method as discussed in Section 2.3, (2) The geometric parameters used in the GENX analysis models maximize the stresses at the pad-to-pipe-juncture. This is because pad thickness considered is much higher than for pipe wall thickness and its length is such that the distance between the surface of the edge of the attachment and the edge of the pad is less than decay length, { G.

(3) The local stress calculated per the project criteria are combined stresses which indude the local effect and pipe stress (MNS), the stress ratios of combined stresses [(ME215+ MNS/ANSYS+MNS)=0.844] Indicate that the maximum difference between the two methods Was reduced to 15.6%. In fact, the results of both ANSYS and ME215 analyses have already included the effect of pipe stresses (MNS). Therefore, using factor of 1.4 in the reconciliation procedure is sufficient.

. i CALCULATION SHEET PROJECT COMANCHE PEAK STEAM ELECTRIC STATION UNITJOB 2 NO. 20935 CALC. NO 2-NP4ENX-644

Subject:

REV. O PAGE 16 Reconciliation on Local Stress Evaluation Using ME215 Analysis 6.0 RESULTS OF RECONCILIATION OF EXISTING ME215 ANALYSIS As of Dec. 24,1991, a total of twenty two (22) anchors have been qualified using ME215 analysis method. Among the twenty-two completed analyses, sixteen do not require reconciliation, as they satisfy the conditions of section 5.1 as follows:

- Seven has no pads.

- Two are not used for code equations 10/11 qualification.

- Seven have margins to code equations 10/11 allowables which exceed 40%.

The remaining six analyses are reconciled per Section 5.0 procedure. Refer to Appendix A for the details of the reconciliation. Results of the reconciliation are summarized as follows:

- The calculated modification factor R values for four (4) of the six analyses are less than one (1.0).

The calculated modified stress S value for the two analyses with an R value which exceeds 1.0, are less than the stress allowables.

Hence, all completed ME215 anafysis as of Dec. 24,1991 are acceptable without a need for revisions to their analyses packages. Future ME215 analysis past Dec.24,1991 should document the results including use of the reconciliation method of Section 5.0.

,v.-.

PROJECT COMANCHE PEAK STEAM ELECTRIC STATION-UNITJOB 2 NO. 20935 CALC.NO 2-NP-GENX-544 REV.O PAGE 17 Subject Reconcillation on Local Stress Evaluation Using ME215 Analysis 7.0 TABLES AND FIGITRES The Tables 7.1, 7.2, 7.3 and 7.4 and Figures 7.1, 7.2 and 7.3 are presented on the following sheets:

i e*

1

)

I

+'

l PROJECT COMANCHE PEAK STEAM ELECTR!C STATION-UNIT 2- JOB NO. 20935 CALC.NO' 2 -NP-GENX- 544 REV, O PAGE1a ,

(

Subject:

Reconcillation on Local Strees Evaluation Using ME215' Analysis Table 7.1 Moabr,ame Stress latensity , ST(M) , Comparison NE213 Analysis Naz. Stream Loads Stress = Stress '

AESTS Stress Ratio (ib.) MNS Pad Ratio. Ratle Pad Naz. Strese Nas. Ratio of of og (in-lb.) .(pel) weld weld (psi) stress R

[1] Sise No. of pad pipe Ma215+M38/ ME215+Mus/ Ms21$/

SI(M) A38Ya/ AESTS+NNA AW8YS AusYs Layer weld- (psi) ME215 3 Forces 0 1/4* 3 2017 1993 2102 1.042 0.940 0.960 '

FX=Fy=Fs 2 1957 1996 O.960 1.653 0.950 '

O.950

=1000 0 3/16* 2434 0.950 2 2000 2102 0.863 1.139 1.159 527 1.159 3 432 0.695 1.252 Mz 273 1/4' 2.187 - 1.439 2 530 432 346 per 0 691 1.237 2.195 l 1.447 1 41,0 424 0.400 1.382 1000 273 3/14* 2.413 1 1.667 2 688 446 376 0.547 1.481 2.537 ' t.828 '

1 801 440 0.469 1.655 2.857 - 2.132 3 250 229 My 273 0.752 1.134 2.783 : 1.330

_.1/ 4

• 2 253 229 188 0.743 1.141 2.799 1,346 per 281 1 230 0.449 1.202 1000 273 3/16* 2 2.9481 1.495 .

311 231 270 0.868 -1.07S 2.164f 1.152 1 347 231 0.778 1.142 3 268 285 2.297i 1.285 Ms 273 0.684 1.192 2.863! l.462 1/4* 2 274 285 198 i per 0.684 1.192 2.8431 f.462 1 315 284 0.619 1.256

! 1000 273 3/16* 2 343 3.017!- 1.615 291 295 0.840 1.004  !

2.~ 0 0 91 1.163 1 392 289 6.753 1.171 I 3 Noments 3 803 2.25$f 1.328 404 0.687 1.245 Mx=1000 473 1/4' 2 802 604 552 0.688 2.312!_ t.455 j- Ny=1000 1.244 2.310! 1.453 1 912 479 0.44S 1.381 i Ms=1000 473 3/16' 2 1043 2.510I 1.652-702 $40 - 0.537 1.467 2.700l 1.862 1 1200 _ _ 6 9.6. . _._0.467 1.419

__ 2.988! 2_ f 41 Note (1) : Nas is the minimum nominal stress which is equal to half of the applied monest(s) devided by the pipe section modules.

i l .'

l l

l

___ . _ _ _ _ - - - - - -- -- - - ~ ~ " ~ ' ~ ~ " ~ **

, . . . _ _ - . - . .. . . _ ~ . . . - ~. . .- . .

l l

PROJECT COMANCHE PEAX STEAW ELECTRIC STATION-UNIT 2 JOB NO. 20935 CALC. NO 2-NP-GENX-544 REV. O PAGE 19 Subject Reconcillation on Local Stress Evaluation Using ME215 Analysis t

Table 7.2 Nombrane Plus Bending Stress Intensity, SI(N+3), Comparison ME215 Analysis Nas. Strese Loads stress stress A38TS Stress Ratio (ib.) N58 Pad Pad Ratio Ratio Naz. Stress Naz. Ratio of (ta-1b.) (psi) Weld weld (psi) Stress R of of (1) Sise No. of pad NE215+NN8/ ME215+NES/ M8215/

pipe N!(N+3)158Y8/ ANST8+NES AESTS tayer fie ld - 121 (psil ! M821$ AuSYS 3 Forces 0 1/4' 3 3217 2154 2904 0.90 1.108 4

Fx=Fy=Fs 2 2653 2165 1.108 1.107 f =1000 1.095 0.914 0.914 1 0 3/14* 2 3249 2201 0.913 2952 0 909 1 101 3 931 1.101 1.101 525 0.626 1.404 N2 273 1/4a 2 046 1.597 2 826 $25 583 0.704 per 1.284 1.886 1.417 1 610 Sit 0.956 4

1000 273 3/14* 1.032 1.515 1.046 2 1043 546 465 0.638 1

1.403 1.979 1.568 Sol S38 0.830 1.14S 1.415 1.205 3 34S 282 '

1.122 My 273 0.936 -

1.S98 0.891 1/4" 2 298 182 per 387 ._1 299 0.865 1.474 1 281 284 0.770 2

1000 1.343 0.844 1.440 273 3/16* 2 352 284 0.734 452 1.284 0 862 1.383

_ 1 347 285 0.779 1.303 0.491 1.372l 3 398 341 0.768_

Na 1.000 1.000 1.6871 273 1/4* 2 334 341 1.000 per 398 1.167 0.915 1.S43 '

O.857 1 31$ 340 1.171 1000 273 J/14* 0.914 1.541L 0.854 2 414 347 475 _1.147 0.918_ 1.447 l 0.672 1 192 344 1.212 0.899 3 Nomente 3 1396 1.401 0.625 tot Ns=1000 473 1/4' 4.635 1.375 2.110 1.$ 76 2 1233 844 844 0.719 I Ny=1000 1.255 1.926 ' 1.392 1 912 854 0.971 Ns=1000 413 3/16' 1.019 1.564 1.029 2 IS42 895 869 _4.554 1.S14 2.342 1.797 1 I 1200 SE- 0.724 i

1

._ J47 1,92 L ._1 3_.6 ,1 1

Note (1)

NN8 le the klaimum nomisal stress which is atual to half of the

' applied monett(s) devided by the pipe section modulus.

12)

The memberase plus bendlay stress intensities,8t(N+s), fros. Ms215 analyels are linearised.

r l

l l

l

. , . . - . - - - .-,..,. - .-. - .. ---.-. . ~ . - - - . - - - . - . . - - , . ~ - . - . - . . - - - - - , - , , - . .

PROJECT COMANCHE PEAK 817.AM ELECTRIC STATION-UNIT 2 JOB NO. 20935 CALC.NO 2-NP-GENX-544 REV. O PAGE 20 Subject Reconciliation on Local Stress Evaluation Using ME215 Analysle Tchle 7.3 Modified Membrane Plus Bandiaf stress Intensity , SI(M+3)

ME215 Strees Ratie, R, of Loade Modi- Modified stress Assrs/mE215 (ib.) weld weld No. fled Ms215 AusYs Due to For Back Moment Competest tia-lb.) size of LaFor Factor stress Stress Moment .

R(Ma) R(MF) 3 R(Ms)- (1) (psi) (PSI) 1396 0.652 1.122 1.000 3 Moment 1/4" 2 0.944 1320 1233 0.735 1.299 Ca=1000 1.167 1.094 1349 ggg 1 912 0.995 1.363 1.171 1.186 Cy=1000 3/16" 2 1562 1002 t's=10 0 0 0.725 1.284 1.147 1.079 Ig85 1 1200 869 3 Moment 0.944 1.303 1.212 1.163 1396 1/4* 3 15931 9.652 1.122 1.849 1.001 15952 Ma=2188 2 13475 0.735 1.299 1.167 15337l Cy=5000 3/16* 2 1.168 15743 l-16797 0.725 1.284 f*s = 3 6 715 1.147 1.148 19187 .16514I e; I Note (1) MedlSed Factor = l(R(Mx)'Mx) ^ 2+(R(Wy)'My) ^ 2 + (R(Mal'%t) ^ 2) ^ 0.5]/(Mu " 2+ Mr ^ 2 e Vt a 2 l

{

s' a

_ ,.4,, ' ' ' "

• PROJECT COMANCHE PEAK STEAM ELECTRIC STATION-UNIT JOB NO. 2 20935 CALC.NO 2-NP-G ENX-544 REV. O PAGE 21

' Subject Reconcillation on Local Stress Evaluation Using ME215 Analysis Table 7.4

!.oad Cases Definition in ME215 and ANSYS Analyses ME215 Analysis ANSYS Analycis Loads Pad Neld No. of No. of (1b.) Size Layers Load Case Layers (in-lb.) Load Case

[1] No. [1]

3 Forces No.

Fx=1000 1/4" 3 1 1 1 Fy=1000 2 2 1 F2=1000 3/16* 2 3 1 2 3 4 1 1/4" 2 5 1 3 Mx=1000 1 6' 1 3/16" 2 7 1 4 1 8 1-3- 9 1 1/4" 2 10 1 My=1000 5 1 11 1~

3/16" 2 12 1 6 1 13 1 3 14 1-1/4" 2 15 1 7, Mz=1000 1 16 1 3/16* 2- 17 1 8 1 18 1 3 19 1 3 Moment 1/4' 2 20 1 9 Mx=1000 1 21 1 My=1000 -3/16* 2 22 1 10 Mz=1000 1 23 1 3 Moment 1/4" 3 24 1 -11 -

Mx=2188 2 25 1 My=5000 3/16* 2 26 1 12 Mz=36715 Note [1] No.-of layers are modeled for the pad weld elements.

= - - - -

PROJECT CALC.NO COMANCHE 2-NP-GENX-544 PEAK STEAM ELECTRIC JOB NO.STATION-U 20935 REV. O PAGE 22 Subject Reconcillation on Local Strss Evaluation Using ME215 Analysis Figure 7.1 Straight Pipe to Ractangular Attachment, ME215 Model g !" , #

.T

• • j i il

[=-

l n 1 i J i,_ . -- -

[8 c ,4 a., -

~r M a-'

, a-oi a-n j'",~

g

__ L 1+n i  %

" - ' WM4WAM 4 3 l

I dn l.

f_ . f l

.a 1 - o, , **

"M "----.!

Pipe Outside Diameter PI-D=3.5*

Wall Attachments PI-T=0.216*

Length AT-D=4.0*

Width AT-D2=4.0*

Wall Pads AT-T=0.5" Length PD-L=6.0" Width PD-W=7.0*

Thickn as AT-T=0.75*

Pad Wald sizes 1/4" cod 3/16'

i PROJECT CALC.NO COMANCHE PEAX STEAM ELECTRIC 2-NP-GENX-544 STATION-JOB NO. ' 20036 - '

REV. O

. Subject Reconcillation'on Local Stress Evaluation UsingPAGE 23 ME215 Analys Figure 7.2 i Side View, AMSYS Model y #

iii ,

i ri m

ri r <-l r"=

5 5

I gi , ,

F ""

N o k

8

, u 1 2 hh 4 El p

- o 1 -

I t I

L. l li  ;

) )

in.u

=3 ~

gNaa

= g .,

~t

._ .i

PROJECT CALC. NO COMANCHE PEAK STEAM ELECTRIC 2-NP-GENX-544 JOB NO. STATION-UN 20935 REY. O PAGE 24 Subject Reconcillation on Local Stress Evaluation Using ME215 Analysis Figure 7.3 Isometric Plot, AN3Y3 Mod.1 vs

= 5

05. 5. - y el 22EE' vvviv7!

II5EE cec $uj _

- 'L

... . g1

m is

3. .

/. ,

A g

Hand% _\~

f

~

k Q, g

. ./

/ =

_.i 1<ii,, z1

' l l <

si,i QL'

t. 'Ma 1 y

~

E r

J

CALCULATION SHEET PROJECT CALC. NO COMANCHE 2 NP.AFNX444 PEAK STEAM ELECTRIC STATION UNIT 2_ JOB NO.

20935

Subject:

REV. ,Q PAGE _ 25 Recorollation on Local Stress Evaluation Using ME215 Analysis

8.0 REFERENCES

8.1 Design ' Criteria For Pipe Stress and Pipe Supports, 2EP-5.12, 2EP Sa3 Revision 0, TU Electric Comanche Peak Steam Electric Station Unit 2.

8.2 ANSYS Finite Element Computer Program, Version 4.2,4.3 and 4,4.

8.3 Bechtel Computer Program ME215, Revision 0 - Stress Analysis for Pipe Component and Pipe Support Using Finite Element Method.

8.4 " Theory of Plate and Shell', by S. Timoshenko & S. Wolnowsky-Krieger, Second Edition.

8.5 ASME Boiler and Pressure Vessel Code, Section Ill, DMslon 1 Nuclear  :

Power Plant Components, Subsection NB,1974 edition.

I 1

9 n

f

---,...-s.,....

..,,,-cy.,,...,,...-....,.,.,,_-._,,_,c_..,--.m- , ,.m.9,-y- .__-m-,,__,,c. , - ,,y- 3

CALCULATION SHEET PROJECT COMANCHE PEAK STEAM ELECTRIC STATION UNIT 2 NO. 20935 JOB CALC. NO 2&mNX 644

Subject:

REV.._0_PAGE A1 Reconciliation on Local Stress Evaluation Using ME215 Analysis ATTACHMENT A (Total No. of Pages: 7)

Reconciliation of' Existing ME215 Analyses i

e

, _ _ _ __ _ - - -- ~ ~ ~ ~ ~

CALCULATION SHEET PROJECT CALC.NO COMANCHE 2 NP MNX444 PEAK STEAM ELECTRIC STATION __ Jos No. UNIT209352

Subject:

_ REV._, Q _.PAGE _ A 2 Reconciliation on Local Stress Evaluaton Using ME215 Analysis Figure (1) illustrates the reconcilietion method described in GENX 544. T all of the pipe supports for which an ME215 analysis has been performe integral attachment to the associated piping, identified to date. The firs (1), 'lWA had pad?' corresponds to the column titled 'PadT in table 1); the sec .

query of figure (1), "360" Pad and Equivalent Pipe Model T correspon(ds to column to right in Table (1) (titled '360 deg. Pad + Eq. Pipe Mod."). Th 10/11 margin' conditional of figure (1) has been subdivided into two colum 1.

The reconciliation procedure described in GENX 544 provides that if no pa the attachment, the ME215 analysis is reconciled for finite element mesh further evaluation (see figure (1)). Therefore, those problems with 'N' (

attributes as listed in the columns to the right. Sim column with the below titles have the classification listed belo passes without need to evaluate other attributes: -

Column Title (Table [1]) .

ME215 Reconciled if "PadT

'360 deg. Pad + Eq. Pipe Mod' N

-Y

• Eqn.10 or 11 Qual by ME215'

' *Eqn.10 or 11 Margin > 40%7 N

'R s 1.07 Y

' Stress (Pipe) + S < Allow T Y Y

indicates the ME215 analysis was reconciled for e indicates the opposite.

l

.--,----+v.., --y9,,- ,y,..,,y, , . . . - ..,.2 ,,,.i-,.www_.y..,,

..%-,ry, , .,.+,,,.#s.......m.

,urm-.,,r . , . . , _ . , . , , _....,,..g. .,-,m -,%

..w.m. .m. __y-,-

COMANCHE PEAK PROJECT - UNIT 2 CALC NO. GENX 544 REV. O RECONCIllATION ON LOCAL STRESS EVALUATION USING ME215 ANALYSIS PAGE A 3 Logic For Reconciliation of 62215 Analyses a

a tas s riouze (1) hav "

Y see eyes saa Y a meriv. pie. m1=,

N Y

ma. se/11 umagia (ptpes oceeve m a < s.e Y M

e==eute a with pipe minimum nominal sere..

< 411ewehle Y

?

. M

• • - -111attaa meessailiation P& tie Sweeems

• Applies to pipe a.nd pad weld only.

I

. i i

Cougoe PGAf(PNCJECT - UNrf a CNA No. 3.NP.wxx.644 RSV, O REC 08ectLAAT10N ON LOC 4. tfMee EVALutf10N USDNS betet8 ANALYTE pAag A.4 TAaLE t I

homenneaem of Camerute Peek Wut8 Andyane tur Overstan 7bsta Deenense Repensereg Pipe and Amomenere tuwuse mesurerias; ogNE-set Br A C, Mhmucrg 1t/14/91 86epart sense Deses Post? totto 3e0 WesL Em to seese meaan.

See + E s. or t t er i1 meetat No. Code Pt Cede #3 Pipe Med Quel Wy M Penet Wergm

?

+ 3e fett bdEttit a 40%t Aapet CT - 8

• 039- CT-t-038 CT-3-036 N == == == ==

40s -CesA .. P W-8.Cus. W .3-Ot0C W. 3-On as Y N N == ==

_423-8384 .- P W.3. css. AP.3-0f0A W .I.0ttA Y N Y Y ==

4H = tem == P H CC.E.75 3-8837A Y N Y Y ==

-198-09-9 .. P CC-3.gss. g-Geen Y H N == ==

400-Ce6A == P FW - t-017 ~ t-007 44s.C7tm Niv--i == == == == -- P Ca at-016 C8- 9 -N005 C8-3-NO30 Y -= == N N Pel4 ros-eses Y P D0-9-W1 00 t era Y N Y N 409-DeaA Y Pe0AWB == P 00-8 -008 = 00 3atSPS Y N Y N eoe=osaA Y (Re0M == P 00 W8 8=tEPO Y N Y N act-DesA Y (R e0M i P

00- 3 -WS = 00 8=15r1 Y N Y N 408-05A Y @e04 == P W

• 3 = l00 = W Ot38 AP = 8-010A N == == == ==

407 - 83 % == P CT-3=0ss. CT=3-038 CT= 3-04A N == == == ==

'act . Casa ~- P RN-g =010 RN=t.010 N .. =. .. ..

401-8t54 .. P Se=0 0Fl= MM-3-000 Y N Y Y ==

404-Stet == P 54= 8 -071 RM-8=000 Y N Y Y -.

40$=8SSR . . , P 00 3 087= 00-8 00-3= Y N Y N 700-DenA LteWR Nose N Pet 4 Y 'P CT-4-185= CT=8-45fM N -= == ==

406-CPgm == == P has.g.tge. tes.t epes .. .= .. Y ..

411-Csem =. P CT-t-00s= 07 9-485 CT-t-OueA N == == == == ==

a0t M P CT-3 =ceD= CT=8-457W Y N == Y == == P 401.CueA CT*4=0FF= CT=8-004A Y N

,- 404-CetA

-- Y .. -- P

_ _ - _ .. -. - -- -- " ~ - - ~ ~ ~ ^ ^ ^ ^'

CALCUL.ATION SHEET PMMECT COMANCHE CALC. No_ 2.NPNM PEAKfTEAM El FCTRIC STATION-UNIT Joe No. 20035 2

&W: Reconcitellon on Local Stress Evaluation.Using ME215 Ana>ysis

_ REV._,_.Q PAGE A-5

. Reply 9/23/91 caks CS-1-N098 and CS-2 N030 weld size: L weld layers:%" 2 > pipe wall use %" weld data of Table 7.2 per Sect. 5 of GENX-544 -

Moment Londine (in.th) _

M, = 3728 Mar Stresa Ration From Table 7.2

= 24619 R (MJ = .735

= 24619 R( ) = 1.299 R( = 1.167 -

R = 1.23 _ _

S (force) = 1039 psi (pipe at ends, elem 763) .

S (moment) = 11645 psi (pipe near att., elem 609)

S = 1039 + 1.23 (11645) = 15362 psi op, = 16531 o

u = o, + S = 16531 + 15362 = 31893 psi Mw=EM#

OK r

d i

+

ge

- . , _ . _ . . . _ . . . -._c_,,, , .. .. .... _, m .._ _ ,. . _ . . . _ . _ . . - . . - . . - . . - . . . . _ . . _ , . . . . - . - . . -

CALCULATION SHEET PROJECT 2-NP4ENX-644 CALC.NO COMANCHE PEAK STEAM ELECTRIC STATION-UNIT _20935 2__ JOB NO Sub}ect: _ REV, O __PAGE A-6 Reconciliabon on Local Stress Evaluation Using ME215 Analysis _

Reply 9/24/91 cales DO-167A,B,D,E; supports DO-2-021-402 D53A,-022,053,-056 Moment Loadine (in-lb)

M, = 144252 Max. Stress Ratios From Table 7.2 My= 17100 R (MJ = 0.830 M, = 3588 R (M,) = 1.303 R (MJ = 1.212 weld size: %"

weld layers: 1 < pipe wall, use 3/16" weld data per Section 5.0 of GENX 544 R = 0.85 < 1.0 OK i

CALCULATION SHEET PROJECT COMANCHE PEAK STEAM ELECTRIC STATION-UNIT 2JOB NO. 20935 CALC.NO 2-NPN444

Subject:

_ REY. 1 PAGE A-7 Reconc47u'on on Local Stress Evaluabon Using ME215 Analysie Reply 10/10/91 cales DO-2-L165F, D0-2 N038 CCR 4031 weld size:

W > pipe wall use %" weld data of Table 7.2 for Sect. 5.0 of GENX-544 weld layers: 2 Moment Imadina M, = 2190 14ar Stress Ratios From Table 7.2 R (M,) = 0.706 My= 36700 R( ) = 1.299 M, = 4960 R( = 1.167 R = 1.295 S (force) = 2287 psi (pipe at ends, elem 515)

S (moment) = 11457 psi (pad weld, elem 1000)

S = 2287 + 1.295 (11457) = 17124 psi og = 13441 ou=og + S = 13441 + 17124 = 30565 psi Allow = 37500 psi OK S

i i

a q _ -. v g r -y

EMCLOSLRE 5 TXX-92353 The Responses to NRCs Questions

1) The input data such as geometric model, mesh and loadings are the same for both ANSYS and ME215.

2) Many of the ME215 verification problems were selected from configurations previously analyzed by the ME214 computer program. ' Die table of comparison shown on page 44 of the verification manual is intended only as a demonstration of the differences between the results of ME215, which is finite element based, and the more conservative results of ME214. ME214 uses simplified non finite element methodologies based on ASME code cases, WRC Bulletin No.107 and other conservative empirical methods as contained in CPSES criteria 2EP-5.12 and 5.13.

The ME214 methodologies are recognized and intended to be conservative. -

ME215 is a finite element analysis computer program and, therefore, provides more realistic results than those from the simplified method of ME214.

3) ME215 is a linear finite element analysis. There is no iteration within mathematic solver. ME215 element library contains quadrilateral element of SAP-IV,3D solid (brick) element of SOLID-SAP and 3D beam element of SAP-IV. Since SAP is a well established program and used widely by the industry. convergence of the code relative the elements used has been established.

The ME215 automatically generated element sizes at the critical regions are selected based on the experiences of previous finite element analyses and the industry practice. The selected element size in these regions is approximately equal to the size of the element thickness. The element size at the critical area of the pipe is equal to the pipe wall thickness. Based on Timonsenko's " Theory on Plates and Shells", the local effect will decay within (6 of the distance (this is supported by ASME Section III), if the size of finite element is less than % (6, it will pick up more than 90% of local effect. The element size equal to the pipe wall thickness is less than % f6 (as shown in the attached table). Therefore, the size of element used in ME215 is adequate and is sufficient to account for local effect.

4) The limitation of ME215 is the configuration of the four standard types of piping attachment. The ME215 can not be executed if the configuration of the welded attachment is not one of these four standard types. Limitations such as problem size, degrees of freedom are dependent on the hardware being used to execute the analysis. Within the four standard configurations, there are no limitations.

5) All applications permitted by ME215 have been benchmarked. The validation problems were microfiched and are attached for review.

e:\rptS\nrc_ ques l

i

$2ress Decay Celculation Based on TimosherAon s Textbook " Theory of Plates And Shells" Elem Size x (in) Bete (Beta)*x  % of Local Effect  !

/Ti (THI)/

Pipe SCN CD TN!(t) T size (in) (in) (in) TNI y

THI TNI 7 7 TN!

7 j 2 inch 40 2.3 75 0.154 0.2068 0.7448 0.1540 0.2068 3.1083 3.1083 0.4787 0.6427 95.1% 91.7% )

80 2.375 0.218 0.2424 0.8992 0.2180 0.2424 2.6510 2.6510 0.5779 0.6427 93.1% 91.7%

160 2.3 75 0.343 0.2952 1.1621 0.3430 0.2952 2.1774 2.1774 0.7469 0.6427 89.2% 91.7%

4 inch 40 4.500 0.237 0.3554 0.6669 0.2370 0.3554 1.8085 1.8085 0.4286 0.6427 96.0% 91.7%

80 4.500 0.337 0.4185 0.8047 0.3370 0.4188 1.5347 1.5347 0.5172 0.6427 94.4% 91.7%

120 4.500 0.437 0.4711 0.9276 0.4370 0.4711 1.3642 1.3642 0.5962 0.6427 92.7% 91.7%

160 4.500 0.531 0.5133 1.0346 0.5310 0.5133 1.2522 1.2522 0.6649 0.6427 91.2% 91.7%

G inch 40 6.625 0.280 0.4712 0.5942 0.2800 0.4712 1.3638 1.3638 0.3819 0.6427 96.8% 91.7%

80 6.625 0.432 0.5783 0.7470 0.4320 0.5783 1.1114 1.1114 0.4801 0.6427 95.1% 91.7%

120 6.625 0.562 0.6526 0.8611 0.5620 0.6526 0.9848 0.9848 0.5535 0.6427 93.7% 91.7%

160 6.625 0.718 0.7281 0.9861 0.7180 0.7281 0.8827 0.8827 0.6338 0.6427 91.9% 91.7%

Q inch 40 8.625 0.322 0.5781 0.5570 0.3220 0.5781 1.1118 1.1118 0.3580 0.6427 97.2% 91.7%

80 8.625 0.500 0.7126 0.7016 0.5000 0.7126 0.9019 0.9019 0.4510 0.6427 95.6% 91.7%

120 8.625 0.718 0.842. 0.8523 0.7180 0.8424 0.7629 0.7629 0.5478 0.6427 93.8% 91.7%

160 8.625 0.906 0.9350 0.9690 0.9060 0.9350 0.6874 0.6874 0.6228 0.6427 92.2% 91.7%

10 inch 40 10.750 0.365 0.6833 0.5303 0.3650 0.6883 0.9337 0.9337 0.3408 0.6427 97.4% 91.7%

80 10.750 0.593 0.8677 0.6834 0.5930 0.8677 0.7407 0.7407 0.4392 0.6427 95.8% 91.7%

100 10.750 0.718 0.9489 0.7567 0.7180 0.9489 0.6773 0.6773 0.4863 0.6427 95.0% 91.7%

120 10.750 0.843 1.0217 0.8251 0.8430 1.0217 0.6290 0.6290 0.5303 0.6427 94.1% 91.7%

12 inch 40 12.750 0.406 0.7915 0.5130 0.4060 0.7915 0.8120 0.8120 0.3297 0.6427 97.6% 91.7%

80 12.750 0.687 1.0178 0.6750 0.6870 1.0178 0.6315 0.6315 0.4338 0.6427 95.9% 91.7%

100 12.750 0.843 1.1201 0.7526 0.8430 1.1201 0.5738 0.5738 0.4837 0.6427 95.0% 91.7%

120 12.750 1.000 1.2119 0.8251 1.0000 1.2119 0.5303 0.5303 0.5303 0.6427 94.1% 91.7%

14 inch 40 14.000 0.437 0.8607 0.5077 0.4370 0.8607 0.7467 0.7467 0.3263 0.6427 97.6% 91.7%

80 14.000 0.75 0 1.1145 0.6729 0.7500 1.1145 0.5767 0.5767 0.4325 0.6427 96.0% 91.7%

100 14.000 0.937 1.2349 0.7575 0.9370 1.2369 0.5196 0.5196 0.4869. 0.6427 95.0% 91.7%

120 14.000 1.093 1.3279 0.8231 1.0930 1.3279 0.4840 0.4840 0.5290 0.6427 94.2% 91.7%

Textbook: " Theory of Plates And Shells" , Second Edition, by Timoshenko and Wainowsky.Krieger Chapter 15 from pp.468 470.

e 4

o S

w

- e Ce a U: n G >

>E h . e

< $ 5 o o a g:Q :2 d C d CCc: 4 r

Y s x DU '

$g gs H MmC  ?

• n ~*

=

%M r z 2 e

Fw A D5 Y/

.8 1

, m A0

< x /

/

Me /

wm 7

/ -

Z /

% /

0 ( C-

~

~

• c -6 c e T M. N. ~. c ~.

~ C C C C C C C C C C '

I

~40OJJ3 [ BOO'] JO cf - (X.U10Esd

r b 7 AFFIDAVIT TXX-92353 STATE OF TEXAS CITY OF IIOUSTON COUNTY OF HARRIS David L. Brannen, being first duly sworn, says:

1. I am a Vice President of Bechtel Power Corporation. Bechtel Power Corporation is the owner of information contained in the ME-215 Validation and User and Theory Manuals entitled " Stress Analysis for Pipe Component and Pipe Support Using Finite Element Method" dated April 1991. Bochtel Power Corporation seeks to have these documents withheld from public disclosure.

2. I am making this Affidavit pursuant to the provisions of the Nuclear Regulatory Commission's rules and regulations, including 10 CRF 2.790.

3. I have personal knowledge of the criteria and procedures utilized by Bechtel Power Corporation in determining and designating information as a trade secret, or privileged or confidential commercial or financial information.

Under that system, information is customarily designated confidential and held in confidence if the release of that information might result in the loss of an existing or potential competitive advantage. Information which f alls into one or more of the following categories is designated confidential:

a. Information which reveals the distinguishing aspects of a process (or component, structure, tool, method, etc.)

where prevention of its use by a competitor without license from Bechtel Power Corporation constitutes a competitive economic advantage over other companies.

b. Information in the form of supporting data, including test data, relative to a process (or component, structure, tool, method, etc.), the application of which data secures a competitive economic advantage, e.g. by optimization or improved marketability.

c. Information which, if available to a competitor would reduce his expenditure or resources or improve his competitive position in the design, manuf acture, shipment installation, assurance of quality, or licensing a similar product.

d. Information concerning cost or price, production capacities,-budget levels, or commercial strategies of Bechtel Power Corporation, its customers, or suppliers.

e. Information which reveals aspects of past, present, or future Bechtel Power Corporation or customer funded development plans and programs of potential commercial value to Bechtel Power Corporation,

f. Information which contains patentable ideas or for which patent protection may be desirable.

g. Information relating to an invention.

4. The User and Theory and Validation manuals entitled " Stress Analysis for Pipe Component and Pipe Support using Finite Element Method" are marked " PROPRIETARY" and are transmitted to the Nuclear Regulatory Commission in confidence.

5. The documents contain confidential commercial information relating to computer software developed by Bechtel Power Corporation through the expenditure of substantial amounts of effort and money.

6. The manuals have been held in confidence by Bechtel Power Corporation and have been disclosed only after each proposed recipient of the information has executed an appropriate agreement, if such agreement has been deemed necessary.

7. The information contained in these manuals is not available in public sources and can not be properly acquired without a license from Bechtel Power Corporation, and the information can not be otherwise duplicated by others without a substantial investment of effort and money by them.

8. Because of the substantial investment of both effort and money by Bechtel Power Corporation in conceiving and developing the computer software described in these manuals, it is Bechtel Power Corporation's expectation that this software will substantially enhance its competitive position in the nuclear industry, and therefore Bechtel Power Corporation has a rational basis for holding this information in confidence.

("vidL.M Da Era 6ne'n h% Subscribed and sworn to before me this __ 4 day of July, 1992. A/d/ld

                                                           ~      '

4LS Notary Public .**""" My Commission

                                                                         ?            \ j 1             !

i "*

                                                                                  ...- ]

ggg __ _ , _ ._ l l y g Log # TXX-92473

                                                           . File # 10010-1       .=
                                                 =       =

n/ ELECTRIC October 7, 1992 Wimsm J. Cahm, Jr. U$f$MearRegulatoryCommission ' Attn;. Document Control Oesk Washington, DC 20555

SUBJECT:

COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)'--UNIT 2 DOCKET NO. 50 446 REQUEST FOR ADDITIONAL INFORMATION ON ME215 SAPCAS COMPUTER CODE Gentlemen: Per your request for permission to ccpy copyright information on the subject - computer code, the enclosure is provided for your information. This enclosure provides BECHTEL's permission to copy the ME-215 User and - . Theory Manual and the' associated validation manual, provided in the. referenced. letter. Please note that this permission for copying'is for . internal use only. Please refer to the enclosure for the specifics on copying. If there are any questions concerning this letter, please call Mr. Carl Corbin at (214) 812-8859. Sincerely, William J. Cahill. Jr. By: J. S. Marshall. Generic. Licensing Manager CBC/tg Enclosure c- Mr. J. L. Milhoan. Region IV w/o enci Mr. B. E. Holian NRR w/encio Resident Inspectors. CPSES (2) w/o enci

                                                      +

cc / O / 9' CD'/O W"" **~ "" ***"""

    .      .             .      ._ _       _     - _.      .      _-                _ = . _ _ _

001 7 '92 14: 37 TO NRR MbF/lb PHut.eU7 Bechtel Comanche Peak Steam Electric Station P.CL Box 1002 Farm Road SG MZ C07 Glen Rose, Texas 76043 CPSES-9231045 WBS-CG88A BEC-CCR-0188TR Subject File 7.21,8.14 September'22, 1992 No Response Required Mr. R.D. Walker Manager of Regulatory Affairs TU Electric Skyway Tower - L.B. 01 400 N. Olive Street Dallas, TX 75201 W ~ "" My{ ,;, ] (( COMANCHE PEAK STEAM ELECTRIC STATION SEP* 4 Wo? M CONTRACT No. C=0001856-7CA BECHTEL JOB 20935 ipr I,RC REVIEW OF ME-215 DOCUMENTATION U CLEA4 u. ,c,;NG

Reference:

1. CPSES-9222546 dated July 16, 1992

2. CPSES-9227365 dated August 25, 1992

Dear.Mr. Walker:

Reference 1 transmitted the documentation related to Bechtel Computer Code ME-215 for submittal to the NRC. Reference 2' authorized the NRC to copy the copyright version of the documentation for their internal use as required during the review process. The purpose of this letter is to further clarify the authorization provided through reference 2. Bechtel horoby authorizes the NRC to copy pages of the proprietary documents, ME-215 User and Theory Manual, as well as the validation manual when such copies are needed to support review and to aid preparation of the SER, copyright notwithstanding. Copies should be kept to a minimum and destroyed after they are no longer needed. Copies should be considered and treated the same as originals under proprietary treatment applied for in reference 1. This authorization is granted with the understanding that any collection of copied pages made from the documents by the NRC will bear the proprietary and copyright notices of the original documentation. l This authorization applies to all ME-215 documentation transmitted through reference 1, unless terminated by Bochtel with appropriate written notice. Copy authorization for future revisions of these documents will be considered at the time of their submission, d

• BechtelEnergy Corporadon i

OCT 7 '92 14: 37 10 NRR: MbFelb FH66.Udd CPSES-9231045 BEC-CCR-0188TR September 22, 1992 By providing this authorization to NRC, Bechtel does not vaive any rights it may otherwise have to control Bachtel copyright material. Sincerely, d[ P.G. Castrichini C35 Project Engineer kRY/mac cc: R.d. Braddy C32 T.A. Hope C07 D.M. Rencher C32 M.2. Khlafallah SFRO g

               -                                ____}}