ML20217N733
| ML20217N733 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 12/21/1995 |
| From: | DETROIT EDISON CO. |
| To: | |
| Shared Package | |
| ML20217N717 | List: |
| References | |
| 0102-00058-100, 0102-0058-100-F02-R1, 102-58-100, 102-58-100-F2-R1, NUDOCS 9804090184 | |
| Download: ML20217N733 (31) | |
Text
i Attachment to NRC-98-0059 4
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ATTACHMENT 4 Detroit Edison File Number R4-1115. (Report No. 0102 00058100 F02, Revision 1) :
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j VECTRA December 21,1995 1
0102-00058.100-005 Detrc + N ~.,
.. Enrico Fermi Unit 2 6400 N. Dixie Hwy.
Newport, MI 48166 ATTENTION:
Mr. Sam Hassoun
SUBJECT:
Revision 1 issue of Calculation Resolving Open Item 131 of the Seismic IPEEE Program -
Dear Sam:
Attached please find the original Calculation 0102.00058.100.F02.01, " Resolution of Open Item i
131 of Seismic IPEEE Program at Fermi Unit 2," Revision 1. This revision provides clarification of the use of the Test Response Spectra (TRS) for the tested Motor Control Centers (MCC). The TRS was compared to the IPEEE Review Level Earthquake (RLE) to address the cautionary statement in EPRI NP-6041-SL' with regard to the use of the screening tables for equipment greater than 40 feet above grade. This revision does not affect the conclusions of the calculation.
If you have any questions, please feel free to call me at (708) 778-4218.
Very truly yours, Greg Ashley j
Project Manager i
GRA/ kin Atuchments
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Fox: (708) 773-4343
- 's17081 778-0100 VECTRA Technologies. inc.
- 2'S Shuman Blvd., Sa 200
- Necennile. it 00563
- e t-
FERMI SFISMIC IPE '
Open Item 131:
Requesc Submit a man-hour, dollar and schedule estimate for performing the task described below, including the approach and methodology proposed for use and any assumptions or conditions.
Statement: EPRI-6041 screening tables 2-3 and 2-4 are used in the seismic evaluation of SSEL structures and equipment regardless of their location in the buildings. However, EPRI-6041 includes a caution statement about using the screening tables for equipment mounted significantly more than 40 feet above grade.
l Task:
Evaluate Fermi SSEL equipment mounted on higher floors,6r a representative bounding case such as MCCs, to satisfy the requirement of j
EPRI 6041.
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nLE N :
y CALCULATION
- 2. o oos s.1oo.n2 PACKAGE PROJECT NO: 0102.ooosa.100 CALC. No:
01o2. 000 s s.100. r02. 01 VECTRA PROJECT NAME:
CLIENT:
Enrico Fermi Unit 2 Detroit Edison Company CALCULATION TITLE:
Resolution of Open Item 131 of Seismic IPEEE Program at Fermi Unit 2-PROBLEM STATEMENT OR OBJECTIVE OF THE CALCULATION:
1 The purpose of this calculation is to resolve Open Item 131 of the Seismic IPEEE Program at Fermi Unit 2. This calculation will address the caution statement provided in EPRI NP-6041-SL with regard to the use of screening tables for equipment located greater than 40 feet above grade.
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DOCUMENT AFFECTED REVISION PROJECT ENGINEER NAMES AND INITIALS REVISION PAGES DESCRIPTION APPROVAL /DATE OF PREPARERS AND CHECKERS G. Ashley R. Choromokos O
All Initial issue g, g,.g B. J. Lee 1
Clarification of TRS b_.
S, qa 2'
55
/2. Z /, 9 5-u B. J. Lee Q
PAGE 1 OF 16 QPES 3 2.1.1 REV.O
VECTRA Nap:rvills, Illinois PROJECT Enrico Fermi Unit 2 File No.
0102.00058.100.F02 OWNER Detroit Edison Company CLIENT Detroit Edison Company Calc No.
0102-00058.100.F02.01 Table of Contents Description Pace No.
1.0 Background...
3 3
2.0 Purpose / Objective..
3.0 References..
4 4.0 Design Input.,
4' 5.0 Assumptions..
5 6.0 Methodology..
5 7.0 Calculation...
10 l
8.0 Results...
12 9.0 Conclusion..
16 Attachments No. Of Pages A.
In-Structure RLE Response Spectra 3
for Elevation 684'-6" Auxiliary Building B.
Test Response Spectra for Gould Motor Control Center 7
1 i
REVISIGN O
S PAGE PREPARED BY/DATE RPC 10/27/95 lb OF CHECKED BY/DATE BL 10/30/95
i VECTRA Neperville, Illinois PROJECT Enrico Fermi Unit 2 File No.
0102.00058.100.F02
- OWNER Detroit Edison Corr oany CLIENT Detroit Edison Gmpany Calc No.
0102-00058.100.F02.01 i
l 1.0 BACKGRO'MD L order to be cost efficient, a seismic margin review should include either a step where elements are quickly screened from further review, or a detailed seismic margin assessment (SMA), based upon experience and judgment concerning their seismic ruggedness to withstand the specified seismic margin earthquake (SME) level. Such screening of rugged elements enables the margin review to quickly concentrate on those elements for which there is a legitimate concern about seismic ruggedness. Tables 2-3 and 2-4 of EPRI NP-6041-SL provide generic conservative estimates of the ground motion below which it is generally not necessary to perform a seismic margin review for particular elements because, in general, they demonstrated capacities above this ground motion level. Table 2-3 presents recommended screening criteria for civil structures while Table 2-4 presents similar recommendations for equipment and subsystems. Tables 2-3 and 2-4 provide screening guidance in terms of 5% damped peak spectral ground acceleration (average of j
two horizontal components). The basis for the response spectrum limits given in these I
tables is similar to that of the bounding and reference spectra of the SQUG Generic Implementation Procedure (GIP), given that both were developed by the NRC Expert Panel and related to seismic experience. Therefore Tables 2-3 and 2-4 screening guidance are primarily intended for elements mounted fairly low (less than about 40 feet above l
grade) in stiff nuclear power plant type stmetures. Care should be exercised in using this l
guidance for components mounted significantly more than about 40 feet above grade or in other spots where large resonant buildup of the input motion might occur.
Enrico Fermi Unit 2 has components located on elevations greater than 40 feet above grade. The applicability of Tables 2-3 and 2-4 is in question for these components.
2.0 PURPOSE / OBJECTIVE The purpose of this calculation is to resolve Open Item 131 of the Seismic IPEEE Program l
at Fermi Unit 2. This calculation will address the caution statement provided in EPRI NP-6041-SL with regard to the use of screening tables for equipment located greater than 40 feet above grade. Specifically, this calculation will consider the bounding case for equipment which is located above this height and compare it to the Review Level Earthquake (RLE).
REVISION O
b PAGE PREPARED BY/DATE RPC 10/27/95 OF @
CHECi(ED BY/DATE BL 10/30/95
VECTRA Nap 3rvills, Illinois PROJECT Enrico Fermi Unit 2 File No.
0102.00058.100.F02 OWNER Detroit Edison Company CLIENT Detroit Edison Company Calc No.
0102-00058.100.F02.01
3.0 REFERENCES
1.)
EPRI NP-6041-SL, "A Methodology for Assessment of Nuclear Power Plant
)
Seismic Margin", Revision 1, August 1991.
2.)
DC-5546, " Seismic Floor Response Spectra for IPEEE", Revision 0.
3.)
Wyle Report No. 43472-1 " Seismic Simulation Test Report for Gould Motor Control Center". Much 25.1977.
4.)
Wyle Report No. 43801-2. " Seismic Simulation Test Report for Gould Motor Control Center", April 23,1978.
S.)
EPRI NP-5223-SL, " Generic Seismic Ruggedness of Power Plant Equipment",
Revision 1, August 1991.
6.)
DC-5634, " Equipment Anchorage Evaluation For Seismic Margin Assessment Program", Revision 0.
4.0 DESIGN INPUT l.)
In-structure RLE spectra are obtained from Reference [2].
2.)
Test Response Spectra (TRS) are obtained from References [3] and [4].
I Both of the above spectra are provided in the body of this calculation ano in Attachments A and B, respectively.
MA -
I REVISION O
PAGE 2 PREPARED BY/DATE RPC 10/27/95 OF I@
CHECKED BY/DATE BL 10/30/95
VECTRA Napsrvillo, Illinois l
PROJECT Enrico Fermi Unit 2 File No.
0102.00058.100.F02 OWNER Detroit Edison Company I
CLIENT Detroit Edison Company Calc No.
0102-00058.100.F02.01 l
5.0 ASSUMPTIONS This calculation will determine the applicability of the screening tables provided in Reference i to equipment and structures located above the 40 foot level in the plant.
Rather than evaluate each type of component in the table, a bounding component is selected based on seismic critical characteristics. This component is considered to have the lowest seismic capacity of those listed in the table. For this calculation, motor control centers (MCC's) and switchgear (SWGR) are considered to be the bounding case since they contain subcomponents (i.e., relays and motor staners) that may be susceptible tc chatter at low levels. The component locations at Fermi and seismic capacity for MCC's and SWGR from the Generic Ruggedness of Power Plant Equipment (GERS) [5], provide insight for choosing a bounding component. Switchgear locations are up to the third floor, and MCC location are up to the 5th floor per DC-5634 [6]. Therefore, MCC's are susceptible to higher in-stmeture amplifications. A review of the GERS for MCC's and SWGR indicate that although SWGR have higher in-cabinet amplification factors (7 vs.
4.5), both components have similar seismic capacities (i.e, peaks of 1.5 to 2.5 g's). The GERS for the MCC are provided for both function during and aRer, whereas the GERS for the SWGR are only provided for the function during. This is because the critical characteristic for the SWGR is the function of the breaker, generally not the protective relays. The function of the breaker is maintained provided structural restraint of the breaker is maintained. Based on this review, the MCC located on the 5th floor is considered to provide an acceptable and reasonable bounding component for this i
evaluation.
6.0 METHODOLOGY As stated previously, the MCC is considered to be the bounding case for the equipment listed in EPRI NP-6041-SL, Tables 2-3 and 2-4. This bounding case is represented by a MCC located on the finh floor of the Fermi 2 Auxiliary Building. Therefore, the horizontal RLE spectra will be compared to the horizontal tested response spectra (TRS) for this equipment. Evaluation of the venical component effects is implicit in the horizontal motion assessment since the eanhquake experience plants typically experienced relatively more vertical motion (ccmpared to horizontal) than that postulated for most nuclear plants. It is also considered that, in general equipment is more sensitive to horizontal motion than to j
venical motion. For this reason, the vertical eanhquake spectra is not explicitly evaluated in this calc'ulation. The horizontal TRS for these MCC's is provided in Reference [3] and
[4].
REVISION O
1 PAGE @
@g, LM10%)
PREPARED BY/DATE RPC 10/27/95 CHECKED BY/DATE BL 10/30/95 h az/g f.K l
VECTRA l
Naperville, Illinois I
PROJECT Enrico Fermi Unit 2 File No.
0102.00058.100.F02 OWNER Detroit Edison Company CLIENT Detroit Edison Company Calc No.
0102-00058.100.F02.01 Both TRS from References [3] and [4] will be compared to the clipped RLE. The envelope g
spectr.. for the mass center and the four corners are used. The RLE spectra for the fifth floor (el. 684'-6") is obtained from Reference [2]. The RLE spectra and TRS spectra at 5% are provided in Attachments A and B. These spectri have been replotted and are shown in Figures 6-1 through 6-3 of this calculation. A cursory review of these spectra reveal that the TRS exceeds the RLE spectra for all fm;uencies except at the narrowband frequency range associated with the peak acceleration. For this condition, guidance is provided in Appendix Q of NP-6041[1], " Seismic Margin Capacity of Components Based Upon Seismic Testing" A comprehensive discussion on the background and theory of spectra clipping is provided in this appendix. The basic premise as quoted from Appendix Q is as follows:
"The peak values ofnarrow-band amphfied mountmgpoint response cannot be compared directly with the broad-band tspe ofinput usedin multi-aris relay testing u hichform the basis of relav GERS.
For complex devices such as relavs, a narrow-band input isjudged to be less j
severefrom afragility standpoint than a broad-hand input, due to the absence j
i ofmulti-mode respoase, variable RAIS severitv over the bandwidth of test spectra, and the lack ofinteraction of nonlinear responses in the narrow-band case. Recent studies have concluded that a constant correctionfactor can be applied to narrow-band data to produce and approximately equivalent broad-band result.
Both hfer: andKana suggest that two corrections should be applied to the narrowfrequency high spectralpeaks of the RRS to produce a damage-effective RRS to be usedfor comparison with a broadfrequency TRS.
This clipping approach may be applied to both narrow-band in-structure spectra to be compared with TRS appropriatefor the base of the cabinet, and to in-cabinet spectra to be compared with the TRSfor a relay or other elements mounted within a cabinet. "
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1 PAGE &
PREPARED BY/DATE RPC 10/27/95 ggQCf OF I@
CHECKED BY/DATE BL 10/30/95 h gjgjg
f VECTRA t
l Nap;rville, Illinois PROJECT Enrico Fermi Unit 2 File No.
0102.00058.100.F02 l
OWNER Detroit Edison Company CLIENT Detroit Edison Company Calc No.
0102-00058.100.F02.01 l
Figure 6-1(a) b Test Response Spectra for MCC - Reference 141 i
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(th) j S-S
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L VECTRA I
Napsrville, Illinois l
PROJECT Enrico Fermi Unit 2 File No.
0102.00058.100.F02 OWNER Detroit Edison Company CLIENT Detroit Edison Company Calc No.
0102-00058.100.F02.01
)
Figure 6-1(b)
Test Response Spectra for MCC - Reference 131 t
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.75 1.05 3.50 3.50 2.70 3.10 3.50 2.50 2.20 2.0 This spectra is from page 127 of Ref. [3], see Attachment B, page 4 of 7.
The p.s TRs 's h.jhe r than 4d C - S TR S,
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REVISION 1
PAGE PREPARED BY/DATE
([gg,Gkfghh oF l I.0 CHECKED BY/DATE k #1/E0/9f,
VECTRA Naperville, Illinois PROJECT Enrico Fermi Unit 2 File No.
0102.00058.100.F02 i
OWNER Detroit Edison Company CLIENT Detroit Edison Company Calc No.
0102-00058.100.F02.01 Figure 6-2 Review Level Earthauske (RLE) Spectra (North-South) @ El. 684'-6" 5% RLE In-Structure Response Spectra j
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N-S 0.32 0.39 0.79 1.02 2.04 3.99 4.18 3.99 2.60 1.44 1.11 1.11 0.81 0.76 The above acceleration values contain the 0.9278 reduction factor provided in Ref. [2].
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l REVISION O
p PAGE 1 PREPARED BY/DATE RPC 10/27/95 OF IIe CHECKED BY/DATE BL 10/30/95
VECTRA l
Nap 3rvilla, Illinois PROJECT Enrico Fermi Unit 2 File No.
0102.00058.100.F02 OWNER Detroit Edison Company 4
i.
(
CLIENT Detroit Edison Company Calc No.
0102-00058.100.F02.01 Figure 6-3 o
l Review Level Earthauake (RLE) Spectra (East-West) @ El. 684'-6" 5% RLE In-Structure Response Spectra 10.00 l
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E-W 0.31 0.42 0.88 1.16 1.86 3.19 3.99 3.19 2.60 2.13 1.48 1.30 1.16 1.25 0.79 0.72 l
The above acceleration values contain the 0.9278 reduction factor provided in Ref. [2].
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REVISION O
A j
PAGE I
PREPARED BY/DATE RPC 10/27/95 oF lb CHECKED BY/DATE BL 10/30/95
7-
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VECTRA Naperville, Illinois l
PROJECT Enrico Fermi Unit 2 File No.
0102.00058.100.F02 l
OWNER Detroit Edison Company CLIENT Detroit Edison Company Cale No.
0102-00058.100.F02.01 i
I In summary, the narrow-band RLE spectra can be clipped and compared to the broad-band TRS spectra. The methodology is detailed in Appendix Q of NP-6041-SL. The development of these clipping factors will be performed in the following section.
7.0 CALCULATION This section will utilize the methodology outlined in Section 6.0 and Appendix Q of EPRI NP-6041-SL [1) to calculate the clipping factor (C,) for the RLE. To obtain an etrective broad-frequency RRS to be compared with a broad-frequency TRS, the highly amplified peaks of the narrow banded RRS should be clipped at a factor of C, of the peak value.
The following relationship between the central frequency and bandwidth is required B=
f,
- where, j
Afoi = total frequency range over which spectral amplitudes exceed 80% of the peak spectral amplitude f,
= central frequency for the frequencies which exceed 80% of the peak amplitude Based on this ratio (B), the following clipping factor (C ) is recommended:
B s 0.20 C = 0.55 0.20 s B s 0.80 C = 0.40 + 0.75B B 2 0.80 C,= 1.0 l
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REVISION O
PAGE 17 PREPARED BY/DATE RPC 10/27/95 oF f(D
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CHECKED BY/DATE BL 10/30/95 1
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VECTRA Nap;rville, Illinois PROJECT Enrico Fermi Unit 2 File No.
0102.00058.100.F02 OWNER Detroit Edison Company CLIENT Detroit Edison Company Calc No.
0102-00058.100.F02.01 1.)
North-South RLE @ Elevation 684'-6" (Ficure 6-2)
Peak Acceleration (Amu) = 4.18 g's @ f = 5.00 Hz 80% Acceleration (Ao s) = 3.34 g's between 4.4 Hz to 5.65 Hz Afoi = 5.65 - 4.40 = 1.25 Hz f' = (5.65 + 4.40)
= 5.03 Hz 2
B=O"=
= 0.25 f,
5.03 therefore, C, = 0.40 + 0.75(0.25) = 0.59 C = 0.59 2.)
East-West RLE @ Elevation 684'-6"(Figure 6-3)
Peak Acceleration (Amn) = 3.99 g's @ f = 5.56 Hz 80% Acceleration (Ao. ) = 3.19 g's between 4.8 Hz to 5.85 Hz Afoi = 5.85 - 4.8 = 1.05 Hz f' = (5.85 + 4.8)
= 5.33 Hz 2
B Af" 1.05 - 0.20 f,
5.33 therefore, C = 0.55 REVISION O
PAGE ll PREPARED BY/DATE RPC 10/27/95 CHECKED BY/DATE BL 10/30/95
VECTRA l'
Napsrvilla, Illinois PROJECT Enrico Fermi Unit 2 File No.
0102.00058.100.F02 OWNER Detroit Edison Company l
CLIENT Detroit Edison Company Calc No.
0102-00058.100.F02.01 l
l 8.0 RESULTS The clipping factors for the RLE have been calculated and are applied to the peaks of the RLE spectra. For the North-South spectra, the peak is clipped to 0.59 x 4.18 or 2.47. For 1
the East-West spectra, the peak is clipped to 0.55 x 3.99 or 2.19. The clipped RLE spectra (RLE )is provided in Figures 8-1 and 8-2. Each of the TRS provided in Figure 6-1(a) and (b) are compared to the upper bound envelope of the RLE in Figure 8-3. As shown in Figure 8 k. the Reference [4] TR.S falls below the RLE in the low frequency range of 1 to I
2.6 Hz, and the Reference [3] TRS for frequencies between 2 to 5 Hz. The Reference [3]
provides the functionality test for the components within the MCC. During this test, a support angle for the MCC broke. The input level was reduced and the remaining tests were completed satisfactorily. Subsequently, Reference [4] performed a test verifying the stmeturalintegrity of the MCC and not the functionality. Therefore. both tests are compared to the RLEc. Although the TRS falls slightly below the RLEc in this low frequency range. it is not significant since the MCC natural frequency is greater than 5 Hz.
b This is verified by the transmissibility plots within the test reports. These plots indicate that the 2-bay and 3-bay MCC have a fundamental frequency at approximately 5.5 Hz and 6.5 Hz, respectively. Since the acceleration inputs to the MCCs are not amplified at frequencies below the fundamental frequency, the RLE exceedances are not of any consequence. Therefore, for this evaluation, the motor control center test response spectmm envelopes the review level earthquake response spectrum at elevation 684'-6" at 5% damping for frequencies ofinterest.
REVISION O
1 4
$9/,t1M(4 PREPARED BY/DATE RPC 10/27/95 CHECKED BY/DATE BL 10/30/95 k gg/qq
VECTRA Naperville, I!!inois PROJECT Enrico Fermi Unit 2 File No.
0102.00058.100.F02 OWNER Detroit Edison Company CLIENT Detroit Edison Company Calc No.
0102-00058.100.F02.01 Figure 8-1 Clipped Review Level Earthquake (RLF,) Spectra (North-South) @ 684'-6" 5% RLE Clipped in-Structure Response Spectra 10.00
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REVISION O
PAGE I PREPARED BY/DATE RPC 10/27/95 OF f ()
CHECKED BY/DATE BL 10/30/95
VECTRA Napsrville, Illinois PROJECT Enrico Fermi Unit 2 File No.
0102.00058.100.F02 OWNER Detroit Edison Company CLIENT Detroit Edison Company Calc No.
0102-00058.100.F02.01 Figure 8-2 Clipped Review Level Earthquake (RLEA Spectra (East-West) rd1684'-6" i
I 5% RLE Clipped in-Structure Response Spectra 10.00 i
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REVISION O
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l VECTRA Nepervilla, Illinois PROJECT Enrico Fermi Unit 2 File No.
0102.00058.100.F02 OWNER Detroit Edison Company CLIENT L Detroit Edison Company Calc No.
0102-00058.100.F02.01 Figure 8-3 I
Test Response Spectra vs. Clipped Review Level Earthauake Spectra for MCC's at Elevation 684'-6" for 5% Dampine Compaison of TRS w. Oipped RLE 10.00,
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REVISION-0 1
1 Ih PAGE PREPARED BY/DATE RPC 10/27/95 g(/g, gdMqCy OF IdP CHECKED BY/DATE BL 10/30/95 h lllh/is i
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VECTRA Naparville, Illinois l
i PROJECT Enrico Fermi Unit 2 File No.
0102.00058.100.F02 l
\\
OWNER Detroit Edison Company I
CLIENT Detroit Edison Company Calc No.
0102-00058.100.F02.01 i
9.0 CONCLUSION
This calculation has selected a bounding component from the equipment listed in Tables 2-l 3 and 2-4 of EPRI NP-6041-SL to compare the capacity of this component to the review level earthquake as part of the seismic margin assessment of the IPEEE Program at Fermi Unit 2. This calculation has demonstrated that the tested response spectrum for the Gould motor control centers (MCC's) envelopes the in-structure response spectra for the 5th floor of the auxiliary building for the review level earthquak.e.
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VECTRA 1
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0102.00058.100.F02 1
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0102-00058.100.F02.01 l
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ATTACHMENT H Test Response Spectra for Gould Motor Control Center l
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