ML20249C009
| ML20249C009 | |
| Person / Time | |
|---|---|
| Site: | Brunswick  |
| Issue date: | 09/30/1997 |
| From: | DUKE ENGINEERING & SERVICES |
| To: | |
| Shared Package | |
| ML20249B959 | List:
|
| References | |
| TR-ECCS-GEN-05, TR-ECCS-GEN-05-NP-R1, TR-ECCS-GEN-5, TR-ECCS-GEN-5-NP-R1, NUDOCS 9806250169 | |
| Download: ML20249C009 (26) | |
Text
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l TR-ECCS-GEN-05-NP Revision 1 September 1997
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HYDRODYNAMIC INERTIAL MASS l TESTING OF ECCS SUCTION STRAINERS l SUPPLEMENT 1 - FREE VIBRATION DATA ANALYSIS i Test Report No. TR-ECCS-GEN-05-NP 4
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i 9806250169 990619 PDR l
O ADOCK 05000324
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%8 DE&5 at.- ,s w Duke Engineering & Services, Inc.,215 Shuman Blvd, Naperville, Illinois 60563 Ph- (630) 778-0100
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DUKE ENGINEERING & SERVICES, INC.
COMPANY DISCLAIMER STATEMENT i
I Please Read Carefully \
l The purpose of this report is to document the results of a hydrodynamic test program conducted by Duke Engineering & Services (DE&S) to investigate the behavior of large capacity stacked disk Emergency Core Cooling System (ECCS) strainers subjected to accelerated separated fluid flow fields. DE&S makes no warranty or representation (expressed or implied) with the respect ,
to this document, and assumes no liability as to the completeness, accuracy, or usefulness of the !
information contained herein, or that its use may not infringe privately owned rights; nor does j DE&S assume any responsibility for liability or damage of any kind which may result from the j use of any of the information contained in this report. This report is also an unpublished work I protected by the copyright laws of the United States of America.
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l TABLE OF CONTENTS Page LIST OF TABLES . . . . . . . ..... .............. .................iv LIST OF FIG URES . . . . . . . . . . . . . . . . . . . . . . . . . . ............. ......v j INDEX OF NOTATIONS AND VARIABLES . . . . . . . . . ............... . vi l
1.0 INTRODUCTION
.... ....... ........... ................ 1
2.0 BACKGROUND
......... ...................... ........I 3.0 TEST PROCEDURE AND DESCRIPTION OF TEST SPECIMENS ....... 1 )
3.1 Free Vibration Test Procedure ..... ..... ... .,. . .1 3.2 Description of Test Specimens . . . ... . .. .... . .3 3.3 Self-Weights and Enclosed Water Weights of Test Specimen . . . . ...6 4.0 TEST RESULTS AND DATA ANALYSIS .. . . .. .... .... . .8 l 4.1 Free Vibration Test Results . . . .. .... .... ..........8 4.2 Coefficients of flydrodynamic Mass . . . ... ...... .... .... 8 4.3 Interpretation of Recults . ..... . ...... ... . ...... 8 4.4 Derivation of inertial Mass Coefficients . . . . . ..... . . . . . . . .. 12
5.0 CONCLUSION
. . . . . . . . ......... ..................... . 19
6.0 REFERENCES
... .... .. ... ... . ..... .......... .. 19 l
APPENDIX A FREE VIBRATION TIME SERIES PLOTS . . . . .. . ... A-1 through A-87 1
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l LIST OF TABLES Page 3.1 PCI Prototype No. Test-1 Physical Properties .. .. .. .... 6 3.2 PCI Prototype No. 2 Physical Properties . . . . .. . .7 3.3 Reference Test Cylinder Physical Properties . . . . . . . . .. .. .. .7 4.1 Free Vibration Test Results .... .. ... . . . . .. ... . . 9 4.2 Derived Inenial Mass Coefficients (< Proprietary Information Removed >) . 15 4.3 Derived Inertial Mass Coefficients (< Proprietary Information Removed >) . . 16 4.4 Derived Inertial Mass Coefficients (< Proprietary Information Removed >) . . . 17 4.5 Hydrodynamic Mass Reduction Factors Due To Perforations . . . .......... 18 TR-ECCS-GEN-05-NP Revision 1 iv
i LIST OF FIGURES Page 3.1 Layout of lead Calibration System .... ... .. . . 2 1 3.2 PCI Sure-Flow" Strainer, Prototype No. Test-1 .4 j
3.3 PCI Sure-Flow" Strainer, Prototype No. 2 . . .. . ....... . . . 5 4
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l INDEX OF NOTATIONS AND VARIABLES C. hydrodynamic acceleration (inertial mass) drag coefficient fsu, measured natural frequency of the support structure, Hz f37 measured natural frequency of strainer test specimen, IIz fcyt measured natural frequency of Reference Test Cylinder, Ik W3yp total weight of support stmeture (hydrodynamic plus self-weight), Ibs W sr.ico hydrodynamic weight of strainer test specimen, Ibs WcVUCo -
hydrodynamic weight of Reference Test Cylinder, lbs V displaced enclosed volume, (ft')
W sr strainer air weight, Ibs Weyt reference test cylinder air weight, lbs W 37,7or strainer total weight (Wsr + WsTtuo),Ibs Wcyt.7or . reference test cylinder total weight (Weye + Wcyt,co),Ibs p water mass density (1.9366 lbf-s /ft' @ 20*C)
W sec. Tor effective specimen total weight (Wsr Tor + Wsce or WcYt Tor + Wsug), Ibs l
l TR-ECCS-GEN-05-NP Revision l- vi
l.0 INTRODUCTION
, This report is a supplement to Report No. TR-ECCS-GEN-01, " Hydrodynamic Inertial Mass Testing of ECCS Suction Strainers," (Reference 1) and provides a step-by-step discussion of the analysis of the data resulting from the free vibration (pluck) tests.
Some of the analysis presented in this report was not discussed in TR-ECCS-GEN-01.
It is presented here because it helps to clarify some of the insights and conclusions presented in that repon.
Some information presented in this report duplicates information presented in TR-ECCS-GEN-01. It is repeated in this report to facilitate the use and understanding of the data and analysis without continual reference to TR-ECCS-GEN-01.
2.0 BACKGROUND
A test program was conducted by Duke Engineering & Services to investigate the behavior of large capacity stacked disk ECCS suction strainers subjected to accelerated separated fluid flow fields. The purpose of the test program was to generate the data required to develop empirically-based values for the hydrodynamic inertial mass coefficient, C , for use in qualification calculations related to installation of replacement ECCS suction strainers in BWR suppression pools.
3.0 TEST PROCEDURE AND DESCRIPTION OF TEST SPECIMENS Reference I provides a complete description of the free vibration tests. The test procedure and test specimens are described again in this section to facilitate the use of this report.
3.1 Free Vibration Test Procedure A load of approximately 200 lbs was applied to the test specimen using the hanging weight load calibration system shown in Figure 3.1. The load was thc.n quick-released by cutting the line and the test specimen underwent submerged free oscillation. Response data (load on specimen and acceleration) was recorded by the data acquisition system during the test. The standard data acquisition rate for free vibration tests was 50 samples per second. Following each test, the data was processed and plotted as a history of the appropriate response for the test duration. The free vibration tests were repeated three (or four) times.
TR-ECCS-GEN-05-NP Revision i 1
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Separate series of tests were undertaken for the small Prototype No. Test-1 l Strainer (100 Series) and the large Prototype No. 2 Strainer (500 Series). In l l addition, tests were performed for; the adapter / boundary assembly alone (i.e. )
without a test specimen attached) (200 Series); the reference smooth test l cylinder (300 Series); and the reference smooth impervious stacked disk (400 Series).
3.2 Description of Test Specimens The two strainer test specimens consisted of the Performance Contracting, Inc.,
BWR stacked disk test strainers (PCI Sure-Flow Strainer, Prototype No. Test-1 and Prototype No. 2). The former is a relatively small 6-disk strainer (65 ft )
for nominal 10-inch pipe, whereas the latter is a large 13-disk strainer (170 ft2 )
for 24-inch pipe, detailed respectively in the PCI shop drawings. References 2 and 3, and shown in Figures 3.2 and 3.3. The disks were made from 11 gauge perforated plate with 1/8 inch diameter holes and 40 percent open area.
The outside diameters of the disks for the small and large strainers are 30 and 40 inches, respectively. As indicated in Figures 3.2 and 3.3, the overall lengths shown are respectively 33 and 54 inches. The significant dimensions were verified at the test site. The only discrepancy was that for the large strainer the spool length was 5-1/2 inches not 6 inches, giving an overall length of 53-1/2 inches.
A Reference Smooth' Test Cylinder was fabricated by wrapping the small strainer with 33 inch wide,18 gauge (0.048 inch) aluminum sheet metal. The sheet metal was secured to the outer diameter of the strainer with self-drilling sheet metal screws. The cylinder free end was covered with a 1/8 inch thick circular plastic board and secured to the perforated strainer using the same kind of self-drilling sheet metal screws. The resulting cylinder was 33 inches long and of uniform 30 inches diameter (up to the flange).
The purpose of the Reference Test Cylinder Test was to provide a basis for !
comparisons with the perforated strainer and standard cylindrical shapes, with i end effects. !
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- STIFFENERS,1/8* C S. PLATE OR LESS NOTE: STIFFENER ORIENTATION MUST BE IDENTICAL ON EACH DISK FIGURE 3.2 PCI SURE-FLOW STRAINER PROTOTYPE NO. TEST-1 TR-ECCS-GEN-05-NP Revision 1 4
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FIGURE 3.3 PCI SURE-FLOW STRAINER PROTOTYPE NO.2 l
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l A Reference Smooth Impervious Stacked Disk Assembly was created by wrapping the small perforated PCI Strainer Prototype No. Test-1 with self-adhesive clear plastic sheets (contact paper) and duct tape to fully cover the i entire strainer. Several 1/8 inch holes were punched through the plastic at the I free end to allow flooding.
The purpose of this test specimen was to provide a direct comparison with the perforated stacked disk strainer.
3.3 Self-Weights and Enclosed Water Weights of Test Specimen The test strainers were weighed at the test site. Based on their physical dimensions the enclosed volumes and associated weight of potentially entrapped water are calculated and are given in Tables 3.1,3.2 and 3.3.
TABLE 3.1 PCI PROTOTYPE NO. TEST-1 PIIYSICAL PROPERTIES l Item Calculation
' Core Volume n/4*12.75 2*29.875 : 3,814 in' __
, Disk Annular Volume n/4*(30 -12.752 )*3.3125*6 11,511 in' l 2
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! Spool End Volume n/4*10.75 *3.375 I 306 in'
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! Total Volume 3,814 + 11,511 +306 l 15,631 in' !
w- . - - . - - - - - - - - . . --
Water Weight 3 l 564 lbs I 15.631*62.36/12 f : d l Strainer Weight (measured) l 305 lbs ',
Note: The Impervious Stacked Disk Strainer has the same physical properties, except the additional weight of 3 lbs must be added to the strainer weight to account for the wrapping material.
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. Core Volume n/4*26 *48 25,485 in' 2 2 Disk Annular Volume n/4*(40 -26 )(1.805*12 + 2.34*l) 17,417 in' ,
l Spool Volume. n/4*242 *5.5 ! 2,488 in'
. 4 :.
i Total Volume i 25,485 + 17,417 +2,488 ! 45,390 in' i i Water Weight- 45,390*62.36/12 5 > 1,638 lbs' Strainer Self-Weight (measured) - : 948 lbs TABLE 3.3 l
REFERENCE TEST CYLINDER PHYSICAL PROPERTIES i 3 '
E Item- l Calculation l Water Weight I (n/4*30 *33)*62.36/12' 2
842 lbs f.
u.Cylinder Self-Weight 4 305 + 19 (measured) . 324 lbs l
.. Note: 19 lbs is the weight of the wrapping material and 305 lbs is the Prototype No. Test - self-weight q
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x E4.0 TEST RESULTS AND DATA ANALYSIS 4.1 Free Vibration Test Results The dominant oscillation frequencies were obtained by simple measurements -
from the oscillation history plots. Acceleration and load cell history records for the duration of free oscillation for both the small and large test strainers are given in Appendix A.
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Results for the four test specimens are summarized in Table 4.1.
- < Proprietary Information Removed >
4.2- Coefficients of IIydrodynamic Mass - ,
The inertial or added mass accounts for the inertia of the fluid entrained by the.
accelerating structure. As the stmeture accelerates, the fluid surrounding the stmeture must accelerate as well The inertia of the entrained fluid is the added mass.'_The hydrodynamic mass for the structural analyses of two dimensional cylindrical structures is generally based on an inenial mass coefficient, C,.' of 2.0 (added mass coefficient of 1.0).
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As long as we maintain dimensional consistency we can equate the added mass term to an added weight term. For the remainder of this report, we will utilize units of pounds force and refer to added weight and hydrodynamic. weight. The total effective weight of a specimen vibrating in water is thus, the specimen weight, W, plus the hydrodynamic weight, CgpVg (contained and added weight).
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! 4.3- Interpretation of Results Esch strainer test specimen is supported by the same support system. The support system is effectively a rotational spring support at the strainer flange. ,
Since the transverse flexural stiffness of the strainer is sufficiently high relative.
to the rotational stiffness of the support system, the frequency response of the combined system is not significantly affected by the strainer stiffness.
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TABLE 4.1 FREE VIBRATION TEST RESULTS
(-
Test Test Frequency Number . Specimen (Hz) d198 Prototype d198a No. Test-1 A d198b ?
E d398 5 Sm th g d398a Cylinder =
d398b s 5
e d498 Smooth S d498a Impervious k d498b Strainer E c.
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d598a Prototype d598b No.2 d598c
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Given that the stiffness of the support system is the same for each specimen and test, the ratio of frequencies is inversely proportional to the square root of the effective mass of the system. Thus, if the hydrodynamic weight (self-weight and added weight) of the Reference Test Cylinder is known, the ratio of the natural frequencies can be used to estimate the added weight of the other specimens as follows.
The natural frequencies measured during the tests includes the effects of the hydrodynamic weight of both the test specimen and the support, thus (Isr/fcyt) = (Wcyt + Wcytmo+ W3cp)/(W37 + Wsuco+ W3ap) or (f 37/fcyt)2 = (Wcyt Tor + Wsur)/MsT. Tor + W3cp)
The Cmof the Reference Test Cylinder was conservatively set to 2.0. The standard inertial mass coefficient of 2.0 for a cylinder refers to the two-dimensional body i.e., an infinitely long cylinder. Use of 2.0 is clearly conservative for a cylinder of finite 1/d ratio.
Assuming the Reference Test Cylinder with C m = 2.0, the total hydrodynamic weight of the Reference Test Cylinder can be calculated using the data given in Table 3.3 as:
Weyt.707 = Weyt + Wcruno = 324 + 2.0*842 = 2008 lbs ;
l Since the support structure will also vibrate along with the test specimen an '
estimate of its total effective weight (self-weight and hydrodynamic weight) is needed. Although the weight of the support assembly is known, its precise l hydrodynamic weight is not. However, an upper and lower bound of its hydrodynamic weight can be used in the calculations to bracket the resulting Cm.
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l 4.3.1 Support Assembly Hydrodynamic Weight - Upper Bound
- Given a natural frequency of < Proprietary Information Removed > for
' the submerged free-vibration tests of the support system alone, an upper bound of its total effective weight can be calculated using the results from the Reference Test Cylinder tests as a reference frame. As before .i with C, = 2.0, Weyt.ror = 2008 lbs The natural frequency from the Reference Test Cylinder test is <
Proprietary Information Removed > and includes the weight of the Reference Test Cylinder and the support structure, thus (f 3ep/fcyt)2 = (WCYL. TOT YWSUP)/Wste or W3cp = Weyt 707/ [(f3 cp/fcyt)2 - 1]
< Proprietary Information Removed >
4.3.2 Support Assembly Hydrodynamic Weight - Best Estimate Similarly, a best estimate can be obtained by considering the three-dimensional nature of the Reference Test Cylinder. Three-dimensional correction to C., per accepted ABS rules (Reference 4), for the Reference Test Cylinder would suggest a correction factor, K, of 0.83 considering the flanged-end boundary as infinite (length to diameter ratio,1/d =33.25/30.= 1.108 with one free end, so that the effective 1/d is 2.217).
C, = 0.83 *2.0 =.1.66 i
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l~ 4.3.3 Support Assembly Hydrodynamic Weight - Lower Bound As a third comparison the hydrodynamic weight of the strainer support system is neglected and the coefficients derived directly from the square l, of the frequency ratios between the Reference Test Cylinder (with C, =
' 2.0) and the strainer specimens. As can be seen in Table 4.4, the l
derived values of C, for Prototype No. Test-1 and Prototype No. 2 are now less consistent, indicating the importance of considering the i
hydrodynamic effects of the support system on the test results. This is because the added hydrodynamic weight of the support system, though the same for both prototype _ tests, is a higher proportion of the total hydrodynamic weight for the Prototype No. Test-1 test than it is for the Prototype No. 2 test.
4.4 L Derivation of Inertial Mass Coefficients'(C,)
- As discussed previously, C, for any strainer specimens can be generally
- calculated as' follows: ~ l E
C, = W sr.n20/ pVg = (Wst. Tor-Wst)/pVg Also, as previously discussed, C, for the strainer test specimens will be calculated relative to the Reference Test Cylinder (C,=2.0).
I Recalling that:
(fst/fcyt): = (Weyeror + Wsue)/Mst. Tor + W 3ep)
Then:
C, = [(fcyt/f )237(WcyLTor _+ W3cp)-(W37 + W3cp)]/pVg
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For convenience, we develop an effective weight ratio by defining the frequency ratio:
br
- bSTIbCYL Then the effective weight ratio can then be defined as:
(l/f,)2 This results in:
Cm= [(1/f,)2 (WcYtror + Wsep) - (Ws r + W st.p)]/pVg Additionally, the effective specimen hydrodynamic weight can be calculated as:
Wsr mo = C, pVg The effective total test specimen weight is calculated as:
Wsec.ror = Ws7,co + Wsr + Wsue The resulting mass coefficients are given in Tables 4.2 through 4.4 for a complete range of strainer support weights. Additionally, by changing the volume, V, to equal the volume of an equivalent cylinder based on the disk diameter, a direct comparison to a cylindrical body can be made.
PCI Prototype No. Test-1 Volume = n/4(30 in)2 (33 in) = 23.326 in' Weight (pVg) = [(23,326 in')/(1728 in2 /ft')](62.36 lb/ft') = 842 lbf TR-ECCS-GEN-05-NP Revision i 13
PCI Prototype No. 2 Volume = n/4 (40 in)2(54 in) = 67,858 in' Weight (pVg) = [67,858 in'/1728 in'/ft'J 62.36 lb/ft' = 2449 lbf The values of C, based upon the uniform cylindrical volume are also shown in Tables 4.2 through 4.4. The results provide additional insight into the effect of the perforated nature of the strainers. Using the derived C values in Tables 4.2 through 4.4, an upper and lower bound and a best estimate of the ratio of C, for the perforated strainer to C, for the smooth impervious strainer is calculated and provided in Table 4.5.
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l l
TABLE 4.5 HYDRODYNAMIC MASS COEFFICIENT (CA i
' COMPARISON FOR A PERFORATED AND A SMOOTH IMPERVIOUS STRAINER Estimate Support Weight C, Ratios Wsup (Perforated / Impervious)
Upper Bound -
Best Estimate < Proprietary Information Removed >
l Iower Bound I
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TR-ECCS-GEN-05-NP Revision l' 18
g . . . . . .. .. . ..
i ' 5.0 CONCLUSION Using a C, of 2.0 for the smooth Reference Test Cylinder as reference, the results indicate a very consistent inertial mass coefficient. . < Proprietary Information Removed
' Comparison of the results for the small strainer tests alone, as a impervious non-perforated smooth strainer, and as a perforated strainer exhibits the change in free -
oscillation frequency, which is indicative of the change in inertial mass of the test specimen. Using the derived C, values, the C, ratios (perforated strainer / smooth .
impervious strainer) range from < Proprietary Information Removed > .
< Proprietary Infonnation Removed >
6.0 REFERENCES
.l. Duke Engineering & Services, Inc., Report No.. TR-ECCS-GEN-01, .
"Ilydrodynamic Inertial Mass Testing of ECCS Suction Strainer", File A16800.F10-001, Revision 2. July,1997
- 2. Performance Contracting, Inc., Engineered Systems Division. Kansas, BWR Test Strainer, Drawing Numbers: ECCS-1, ECCS-2, Rev 0,02-10-93
- 3. Performance Contracting, Inc., Engineered Systems Division, Kansas, ECCS Suction Strainer, Drawing Number: ECCS-003, Rev 1,07-31-95
- 4. American Bureau of Shipping, " Rules for Building and Classing Mobile Offshore Drilling Units," 1980 Edition.
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APPENDIX A FREE VIBRATION TIME SERIES PLOTS TR-ECCS GEN-05-NP Revision 1 A-1
NOTE: In the plots for Tests d598 d598b and d598c, the time scale is factored by 6.25, i.e.1~00 seconds displayed on the plots is 16 seconds real time.
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