ML20236J540
| ML20236J540 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 06/16/1987 |
| From: | Alexandru R, Sunny Chen, Hettinger F EBASCO SERVICES, INC. |
| To: | |
| Shared Package | |
| ML20236J341 | List: |
| References | |
| SAG.CP28, NUDOCS 8708060201 | |
| Download: ML20236J540 (12) | |
Text
.
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SAG.CF28 O' .
EBASCO SERVICES INCORPORATED I I
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- l. I PROCEDURE FOR SCREENING OF CABLE TRAY HANGERS TO ASSESS '
THE APPLICABILITY OF A 1.25 MRM IN EQUIVALENT STATIC METHOD ANALYSIS IN HANGER DESIGN VERIFICATION FOR q j
CQMANCHE PEAK STEAM ELECTRIC STATION l UNITS 1 AND 2 l
i
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l 3
l APPROVED DATE PAGES REVISION PREPARED REVIEWED BY AFFECTED BY ,
BY R.S. ALEXANDRU 4/30/87 ALL 0 S. h. CI F. HETTINGER Q SWANSON.',> r W -
5
/ M -
R.S. A XANDR 6/16/87 Figure 1.
,O 1 S. J. CHEN F. RETTINGER Pages 2&3 V (M 870B060201 B7 343 PDR ADOCK O PDR A
k
SAG.CP28 TABLE OF CONTENTS PAGE 1.0 -INTRODUCTION , 1 2.0 REFERENCE DOCUMENTS 1 3.0 HANGER SCREENING PROCEDURE 2 ..
3.1 Initial Screening 2
-3.2 Identification of Hanger Subgroups 3 3.3 Adjacent Span Comparisons 3 3.4 Identification of Problem Hangers 3 3.5 Disposition of Problem Hangers 14 4.0 ATTACHMENTS FIGURE 1 - SCREENING PROCEDURE FLOW CHART FIGURE 2 - GUIDELINES FOR ADJACENT SPAN COMPARISONS
+
FIGURE 3 - TABLE OF MRM VALUES i
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1 1
SAG.CP28 1
1.0 INTRODUCTION
This procedure provides guidelines for the screening of cable tray hangers (CTH) to assess the applicability of a 1.25 MRM (Multimode Response Multiplier) in the Equivalent Static Method (ESM) of-analysis for Comanche Peak Steam Electric Station (CPSES) Units 1 and 2. These guidelines, in conjunction with the parametric studies documented in !
Reference 4 and the other MRM studies documented in Reference 5, provide I justification for the use of a 1.25 MRM to adequately evaluate dynamic I multimode and system response effects in ESM analysis, and outline alternative analytical methods to be used for the evaluation of those j hangers for which the 1.25 MRM may not be applicable. ;
The equivalent static methodology utilized by Ebasco for CPSES incorporates a multimode response multiplier to account' for the dynamic system response effects of cable tray span, tray stiffness, and hanger stiffness variations in a statically analyzed cable tray system. The studies performed in References 4 and 5 have established a MRM value of 3 1.25 for CPSES cable tray hangers. The selection of the 1.25 MRM value, J however, was not predicated on an absolute maximum worst case scenario f encompassing every conceivable cable tray system but rather, was selected i as a reasonably conservative value appropriate for the types of cable ~
tray systems representative of those installed at CPSES. The use of this reasonably conservative MRM value versus an absolute worst case MRM necessitates cable tray hanger screening to ensure that those actual CPSES plant systems for which the 1.25 MRM is used do not fall cutside'of O the limitations established by the referenced parametric study'.
summary of these limitations and the hanger screening methodology to be used for the review of ESM analyzed cable tray hangers is provided in the A
subsequent sections for the lateral and transverse tray directions. For !
the longitudinal tray direction, load distribution methodology is presented in Attachment Y of Reference 3.
2.0 REFERENCE DOCUMENTS
- 1. Ebasco Document SAG.CP4, Seismic Design Criteria for Cable Tray l Hangers for CPSES Unit No. 1, Revision 5, dated April 10, 1987.
- 2. Ebasco Document SAG.CP3, Seismic Design Criteria for Cable Tray Hangers for CPSES Unit No. 2, Revision 8, dated April 10, 1987.
- 3. Ebasco Document, Cable Tray Hanger General Instructions for Cable Tray Hanger Analysis for CPSES Unit No. 1 and 2, Revision 7, dated April 30, 1987. ,
- 4. Ebasco Document, Cable Tray Hanger Volume 1 Book 15, Sections I & II, Consideration of Systems Effects in ESM Analysis for CPSES Cable Tray Supports-.
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- SAG.CP28
- 5. Ebasco Document, Cable Tray. Hanger Volume I Books 9, 10, and 23, MRM Related Studies, Ebasco Services Incorporated.
- 6. Ebasco Document SAG.CP11, System Analysis of Cable Tray and Hanger-Assembly For Comanche Peak. Steam Electric Station Unita 1 and 2,.
Revision 3, dated April 30, 1987.
3.0 HANGER SCREENING PROCEDURE The NRM parametric study has concluded that for par'iculart atypical CPSES-caole tray systems the lateral and transverse direction MRM values may be larger than 1.25. Such systems include those in which a " stiff" hanger is located adjacent to multiple " soft" hangers separated by'approximately equal tray spans or, those systems in which a " soft" hanger is located adjacent to multiple " stiff" hangers separated by approximately equal tray spans. The methodology to be used for screening cable tray hangers to identify such systems is outlined in the flowchart provided in Figure 1 and is supplemented by the descriptions provided in the subsequent-
~
sections. This screening shall be performed separately in both the lateral and transverse directions.
As indicated in Figure 1,'all ESH analyzed hangers will be screened for 1.25 MRM applicability primarily through the identification of " soft" hangers. Soft hangers are defined as follows:
- 1) Lateral (Y) direction (i.e.' perpendicular to the cable tray bottom; vertical for a horizontal tray run)
(a) Based on a symmetric configuration (span length variation less than 33 percent), a " soft" hanger is one with a frequency below ;
the required minimum hanger frequency, if , of 12 Hz. If a soft hanger is located within a group of stiff hangers, the minimum hanger frequency can be lowered to f2 = 8.5 Hz.
(b) For an unequal span length configuration thej minimum support frequency equal to2 f shall be used, (ie f2"f3 = 8. Hz). R1
- 11) Transverse (Z) direction (ie. perpendicular to the cable tray side rail)
(a) Similar to the lateral direction except that f1 is 20 Hz and f2 - 15 Hz.
(b) For an unequal span length configuration, the minimum support frequency f 3, is 10.6 Hz when the adjacent span length difference is larger than 33 percent. The adjacent span lengths R1 are those either at a stiff support located in a group of soft supports or at a soft support located in a group of stiff supports.
3.1 Initial Screening -
From the CTH drawings, CTH calculations, and/or the CTH database (as applicable) the following shall be identified:
O-I I
1
{
J SAG.CP28 O' ,. a) hangers which support 36 X 6 trays b) ' hangers with a hanger frequency, Fs, less than 12 Hz in the lateral direction (Group A - late'ral) c) hangers with a hanger frequency, Fs, less than 20 Hz in the transverse directon (Group A - transverse) 4 3.2 Identification of Hanger Subgroups Classify those Group A hangers identified in Sections 3.lb and 3.1c into subgroups A1, A2, and A3 for both the lateral and transverse directions.
Group Al Group A2 Groun A3 Lateral Direction 8.5 Hz 6Fs < 12 Hz N.A. Fs < 8.5 Hz R1-Transverse Direction 15 Hz SFs < 20 Hz 10.6 fr Fs < 15 Hz Fs < 10.6 Hz Group Al hangers shall be further reviewed to identify those tray system layouts for which neither of the adjacent hangers are located within Group A.
3.3 Adjacent Span Comparisons Adjacent tray span variations shall be reviewed for Group Al and Group A2 hangers. Cases in which the length of the longer tray span, L Long, does-O not exceed the length of the shorter tray span,'L Short, by more than 33 perednt (ie (L Long/L Short) - 16 0.33) shall be identified. The-guidelines provided in Figure 2 shall be used in the determination of the appropriate span lengths. For a free ended tray span, the span variation can be considered as greater than 33 percent.
3.4 Identificatied of Problem Hangers Thus far, the screening methodology outlined in this procedure has focused on the definition and identification of the " soft" hangers. The limitations on the applicability of the 1.25 MRM, however, remain a function of not only the soft hanger but rather the " soft" hanger frequency relative to the adjacent hauger frequencies and tray span variations. As indicated in Figure 1 for those Group Al "sof t" hangers where neither of the adjacent hanger frequenc'as are in Group A, the 1.25 MAM remains adequate. Likewise for Group Al and A2 hangers for which the adjacent span difference ((L Long/L Short)-1) is larger than 0.33, the 1.25 MRM is also satisfactory. Problem hangers, defined as those hangers for which the 1.25 may not be applicable, are limited to any adjacent hanger with a hanger frequency greater than' the " screened" hanger.
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l O SAG.CP28 (d " Problem" hangers shall be further reviewed to identify those hangers located immediately adjacent to an Appendix 4 violation tray span for which load distribution has been performed in accordance with the requirements of Attachment Y Part II of Reference 3. For these particular hangers since load distribution has already been performed, additional review for MRM applicability in the plane of the Appendix 4 violation is not required.
3.5 Disposition of Problem Hangers The hangers identified in Section 3.4 as " problem hangers" shall be re-evaluated using one of the following alternatives with the noted exception that alternative 2 or 5 shall not be used to re-evaluate those l hangers which support 36 X 6 trays.
- 1. Perform ESM analysis using 1.5 times the peak acceleration of the applicable response spectra curve in the identified problem direction. The resultant stresses from this direction seismic excitation shall be combined with dead load stresses and other direction seismic stresses in accordance with the requirements of References 1, 2, and 3. The following conservative ratio comparison may be used in lieu of detailed reanalysis:
1.5 x gPeak x IR 6 Allowable Stress IR applicable
/O 1.25 g ESM for particular loading combination V g
- 2. Obtain the MRM value for the identified problem direction from the table provided in Figure 3. (Note that the screening procedure presented herein is conservative. Therefore, the use of Figure 3 may show that for some " problem hangers", a 1.25 MRM is adequate). The following conservative ratio comparison may be used in lieu of detailed reanalysist MRM Fig 3 X IR 6 Allowable Stress 1R applicable 1.25 for particular loading combination
- 3. Perform a spring model dynamic RSM analysis for the identified direction. The RSM analysis shall be performed in accordance with the methodology outlined in Section 3 (" Seismic Analysis") of Attachment Y Part II of Reference 3. The spring model shall be idealized as a straight tray system similar to the model used in Section II of Reference 4. The tray reaction obtained from the RSM analysis shall be used to derive an appropria'e MRM t value (MRM = RSM reaction /ESM reaction). The derived MRM, but in no case less than 1.25, shall be used for static hanger reanalysis.
- 4. Perform a three-dimensional dynamic RSM analysis in accordance with the requirements of Reference 6.
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t SAG.CP28 w
( )
For cases in which the tray design weight exceeds 50 percent of the s/s 5.
full tray design weight, rescreen with a recomputed hanger frequency adjusted for 50 percent of the full tray weight without fireproofing (i.e., 17.5 psf). Since the minimum hanger frequencies and resultant MRM values identified in both the screening procedure and Figure 3 were conservatively developed using 50% of the full tray weight excluding fireproofing, rescreening with the recomputed hanger frequency will reduce this conservatism. The hanger frequency.shall be recomputed as follows:
i
+W 1/2
[W where:
Recomputed frequency = Actual Hanger Frequency x1 H l y H l W y (1bs) = 17.5 pef x tray width x tributary tray ( W + W length (
W (1bs) = tray design weight (with fireproofing, if any), applied at hanger tray location I
l WH (1bs) = hanger dead weight (with fireproofing, if any) divided by total number of. trays l l
t l
If Option 5 is used and at some future date the design cable fill ,
is revised, it is not necessary to readjust hanger frequencies and l
[, . '
rescreen. If however, hanger stiffnesses are revised,theq l
\ recomputation of hanger frequency and rescreening must be performed. j s_-
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f I
ma28
- FIGURE I
\'
SCREENIN
G. PROCEDURE
l ESM 3 HANGERS -
.i IS YES TRAY 36 X 67 NO 1 NO GROUP A Fs4Ig
, .YES r
h h
GROUP A2 GROUP A3 GROUP A1 Fs<f3 f 2KFs<f1 f 3f Fs <f2 j IS ARE.
ADJACENT EITHER ONE OF YES IF R CE NO ^ " .
(L LONG/LSHOR1)1 O HANGERSIN GROUP A7 S A(LER 0.33 7 I
l tr
- NO USE ESM/ESML UNLESS '
IDENTIFIED AS A lYES PROBLEM H ANGER IN Q' C IDENTIFY PROBLEM HANGERS Y (LATER AL) 2 (TR ANSV.)
f g=12 H f t=20Hz f 2*15 12 = B.5 -
f 3=10.6 R1 YES IS HANGER AN f 3. 8.5 USE ESML
, APP 4 VIOLATION 7 Y(LATERAL)
Z- ', l NO (TRANSVERSE) j o
OPTIONS 1
._ 1, PERFORM ESM WITH 1.5 m g PEAK
- 2. PERFORM ESM WITH FIGURE 3 MRMS
- 3. PERFORM SPRING MODEL RSM
- 4. PERFORM DETAtLED MODEL RSM l
- 5. RESCREEN WITH FREQUENCY i ADJUSTMENT DUE TO TRAY FILL -
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SAG.CP28 FIGURE 2: GUIDELINES FOR ADJACDiT SPAN COMPARISONS Examples of the appropriate tray spans to be used for adjacent tray span comparisons are as follows: -
APPROPRIATE TRAY SPAN ACTUAL TRAY CONFIGURATION FOR HANGER A LKr N 9 LATERAL SPANA = a + beos o< + c J
/ A b TRANSVERSE SPANA=a+b+c
/
TRA45.
% c b
LAT N 4 LATERAL SPANA=a+b I A'
' TRANSVERSE SPANg=a
' % 48.
No Amos 4
- oshow b LAT LATERAL SPANA = smaller of a + c or a + b
/
i g TRANSVERSE SPANA=a C c 9 No AMtums4 f
- m. . .
LD LATERAL SPANA=a
/ %
g A IRANS\ERSE SPANA=a w s. y b
- i i
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SAG.CP28
, FIGURE 3 - TABLE OF MFJi VALUES Ns HANGER FREQUENCY MRM VALUES
" PROBLEM" HANGER
" ADJACENT" " PROBLEM" HANGER HANGER LATERAL DIREC.(Y) TRANSVERSE DIREC (Z) 3.2 Hz 1.25* -
5.0 Hz 1.25* -
7.1 Hz 1.25* -
10 HZ 10.0 Hz 1.25* -
12.2 Hz 1.31 -
14.1 Hz 1.25* -
17.3 Hz 1.25* -
22.4 Hz 1.25* -
3.8 Hz 1.25* -
6.0 Hz 1 . 25* -
8.5 Hz 1.25* -
12.0 Hz 1.25* -
12 HZ 14.7 Hz 1.25* -
fs 17.0 Hz 1.25* -
(',) 20.8 Hz 26.8 Hz 1.25*
1.25*
I 4.7 Hz 1.25* 1.25*
7.5 Hz 1.25* 1.25*
10.6 Hz 1.25* 1.25*
15.0 Hz 1.25* 1.25 15 HZ 16.8 Hz 1.25* 1.31 18.4 Hz 1.25* 1.57 21.2 Hz 1.25* 1.68 26.0 Hz 1.25* 1.51 ,
33.5 Hz 1.25* ,
1.43 6.3 Hz 1.25* 1.25*
10.0 Hz 1.25* 1.25*
14.1 Hz 1.25* 1.25*
20 HZ 20.0 Hz 1.25* 1.25*
22.4 Hz 1.25* 1.25*
24.5 Hz 1.25* 1.25 28.3 Hz 1.25* 1.25* ;
34.6 Hz 1.25* 1.25*
44.7 Hz 1.25* 1.258
I l
l
- SAG.CP28
[ ) FIGURE 3 - TABLE OF MRM VALUES (Cont'd) )
l HANGER FREQUENCY MRM VALUES )
" PROBLEM" HANGER j i
" ADJACENT" " PROBLEM" ]
HANGER HANGER LATERAL DIREC.(Y) TRANSVERSE DIREC (Z) 9.5 Hz 1.25* 1.25*
15.0 Hz 1.25* 1.25*
21.2 Hz 1.25* 1.25*
30 HZ 30.0 Hz 1.25* 1.25 36.7 Hz 1.25* 1.25*
42.4 Hz 1.25* 1.25*
52.0 Hz 1.25* 1.25*
67.1 Hz 1.25* 1.25*
l NOTES: 1) 1.25* identifies those ?EU1 values which are less than 1.25 1
- 2) MRM values are applicable for all tray sizes except 36 x 6
()
' 3) Linear interpolation of MRM values is permitted fop those cases it uhich the hanger frequency is bounded by the table frequencies
- 4) Extrapolation of MRM values for any hanger frequencies not bounded by the table frequencies is not per=itted I
I 4
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