ML20249C004
| ML20249C004 | |
| Person / Time | |
|---|---|
| Site: | Brunswick  |
| Issue date: | 09/30/1997 |
| From: | DUKE ENGINEERING & SERVICES |
| To: | |
| Shared Package | |
| ML20249B959 | List:
|
| References | |
| TR-ECCS-GEN-01, TR-ECCS-GEN-01-NP-R2, TR-ECCS-GEN-1, TR-ECCS-GEN-1-NP-R2, NUDOCS 9806250162 | |
| Download: ML20249C004 (83) | |
Text
{{#Wiki_filter:, TR-ECCS-GEN-01-NP Revision 2 September 1997 l HYDRODYNAMIC INERTIAL MASS TESTING OF ECCS SUCTION STRAINERS l Test Report No. TR-ECCS-GEN-01-NP
]
i l I l 9906250162 990619 '- PDR ADOCK 05000324J G PDR
& DE55 nd uat,msuan l
L ., Duke Engineering & Services, Inc.,215 Shuman lilvd Naperville, Illinois 60563 Ph.;(630) .778-0100
DUKE ENGINEERING & SERVICES, INC. COMPANY DISCLAIMER STATEMENT 1 1 Please Read Carefully The purpose of this report is to document the results of a hydrodynam.ic 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 DE&S assume any responsibility for liability or damage of any kind which may result from the use of any of the information contained in this report. This report is also an unpublished work protected by the copyright laws of the United States of America. l I I l Revision 2 ii
m. EXECUTIVE
SUMMARY
This report presents 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. The purpose of the test program was to generate the data required to develop empirically based values for the coefficients of constant velocity drag, C,, and hydrodynamic (inertial) mass, C,. Test results were obtained by accelerating the test objects through still water and by submerr ed free vibration tests. The experimental investigation was designed and managed for DE&S by Dr. David Williams of Digital Structures, Inc. (DSI) and performed at the Offshore Model Basin
. (OMB) in Escondido, California. The tests were performed using Performance Contracting, Inc. (PCI) Sure-Flow" stacked disk strainer prototypes.
This report describes the test program, test instrumentation, data reduction, and presents the results of the PCI stacked disk strainer hydrodynamic tests. The significant . conclusions drawn from the reduction of the data recorded during the tests are as ) follows: l l
- The hydrodynamic coefficient of drag Co, as expected, is higher than that for an l impervious smooth cylindrical body of same major dimensions. < Proprietary l Information Removed > )
- The resultant coefficient of inertial mass, C., is substantially lower than that for an impervious smooth cylindrical body of same major dimensions. <
Proprietary Information Removed > 1 l These conclusions are applicable in the lateral direction to stacked disk strainers which are similar to the PCI prototype designs tested. This report discusses in detail those ; parameters which significantly influence the conclusions and which must be evaluated to i determine their applicability. l ) l l TR-ECCS-GEN-01-NP Resision 2 iii L
l I' I I i TABLE OF CONTENTS i Page E LIST OF TABLES . . . . . . . . . . ......................................vi l l LIST OF FIG URES ' . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii INDEX OF NOTATIONS AND VARIABLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . viii-
^ 1.0 ' INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 l 1.1 Background' . 1 1.2 A pproach . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
- 1.3 - Obj ec tive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.4 Report Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 i
- 2.0 - SCOPE OF TEST PROGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 l 2.1 ~ General Description of Experiments . . . . . . . . . . . . . . . . . . . . . . . . . . 2 l . 2.2 _ Test Specimens .......................................3 l l ;
l 13.0 DESCRIFFION OF TEST EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 ; P 3.1 Test Facility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1 l 3.2 - Test Equipment .....................................11 l 3.3 Test Instrumentation . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . 12 .j 3.4 Data Acquisition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 j
-i
' 4.0 . - TEST PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 4.1 . Tes t Matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
- 4.2- - Sequence of Testing Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 4.3 Measurement of Strainer Weight and Dimensional Properties . . . . . . . . . 30 4.4' Transducer / Instrumentation Calibration . . . . . . . . . . . . . . . . . . . . . . . 30 1 4.5 Test Data Collection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 4.6 Test Data Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 4.7 - Test Monitoring' ' . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . 32 )
c i l 5.0 RES ULTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 5.1- Approach to Results Interpretation . . . . . . . . . . . . . . . . . . . . . . . . . . 42 5.2 Constant Velocity Towing (Drag Forces) . . . . . . . . . . . . . . . . . . . . . . 43
- 5.3 Accelerated Towing (Hydrodynamic Mass) . . . . . . . . . . . . . . . . . . . . . 44
.5.4 Free Vibrations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
. TR.ECCS-GEN-01-NP Revision 2 iv -
I i if
- - - _ - , - - - - . - - - - . . - - - - - - _ _ - - - - - . - - - - _ . _ - _.-ms-
6.0 DISCUSSION OF RESULTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 1 6.1 Approach to Results Interpretation ..........................61 Coefficients of Drag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 6.2 6.3 Coefficients of Hydro ynamic Mass . . . . . . . . . . . . . . . . . . . . . . . . . 61 ( 6.4 Vortex Shedding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 6.5 Free Vibration s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 6.6 Perforations and Hydrodynamic Mass Coefficients . . . . . . . . . . . . . . . . 63 6.7 Application of Test Results -. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
7.0 CONCLUSION
S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 8.0 RE FER ENCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 APPENDIX A LIST OF TEST INSTRUMENTATION . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1 APPENDIX B CALIBRATION DATA .....................................B-1 B-1. Load Calibration . . . . . .. . . .. . . . . . . . . .. . .. . . . . . . .. . . . . . B-2 B-2. Calibration Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-13 B-3. Velocity and Acceleration Calibration Data . . . . . . . . . . . . . . . . . . . . B-21 l TR-ECCS-GEN-01-NP Revision 2 v
LIST OF TABLES Page 4.1 Matrix for 100 Series Tests ...................................33 4.2 Matrix for 200 Series Tests ...................................34 4.3 Matrix for 300 Series Tests ...................................35 4.4 Matrix for 400 Series Tests ...................................36 4.5 Matrix for 500 Series Tests ...................................37 4.6 Predicted Drag Forces ......................................38 4.7 Predicted Inertia Forces .....................................39 5.1 Constant Velocity Towing Test Results, Strainer Drag Forces .............47 5.2 Constant Velocity Towing Test Results, Reference Body Drag Forces ........48 5.3 Initial Impulse Towing Test Results, Strainer Inertia Forces ..............49 5.4 Initial Impulse Towing Test Results, Reference Body Inertia Forces .........50 5.5 Free Vibration Test Results ...................................51 6.1 Geometric Parameters of Tested Strainers ..........................65 l i I 1 TR-ECCS-GEN-01-NP Revision 2 vi
LIST OF FIGURES Page 2.1 Photo of PCI Sure-Flow Strainer, Prototype No. Test-1 . ............... 5 2.2 Photo of PCI Sure-Flow" Strainer, Prototype No. 2 ....................6 2.3 Outline of PCI Sure-Flow" Strainer, Prototype No. Test-1 ................ 7 2.4 Outline of PCI Sure-Flow" Strainer, Prototype No.2 . . . . . . . . . . . . . . . . . . . . 8 2.5 Photo of Reference Smooth Test Cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.6 Photo of Reference Smooth Impervious Stacked Disk Strainer .............10 3.1 Overview and l2yout of the OMB Towing Basin .....................14 3.2 Photos of the OMB Basin and Towing Carriage ......................15 3.3A OMB Subframe Arrangement (Rear View) .........................16 3.3B OMB Subframe Arrangement (Side View) .........................17 3.4 Photo of OMB I.oad-Cells to Subframe Arrangement ..................18 3.5 Layout of OMB Load-Cell Measuring System on Subframe . . . . . . . . . . . . . . . 19 3.6 Photo of DSI/OMB Subframe with Strainer Adapter ...................20 3.7 Layout of DSI/OMB Strainer Adapter ............................21 3.8 Layout of DSI/OMB Test Specimen Boundary / Flow Deflector . . . . . . . . . . . . . 22 3.9 Photo of DSI/OMB Test Specimen Boundary / Flow Deflector .............23 3.10 DSI/OMB Test Specimen Boundary / Flow Deflector with Strainer Adapter . . . . . 24 3.11 12yout of Test Instrumentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 3.12 Block Diagram of Data Acquisition System . . . . . . . . . . . . . . . . . . . . . . . . . 26 4.1 Example of Target Travel Definition .............................40 , 4.2 Layout of Load Calibration System ..............................41 l 5.1 Velocity History - Test d 105a . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 5.2 Prototype No. Test-1 Drag Force History - Test d104 . . . . . . . . . . . . . . . . . . . 53 l 5.3 - 4totype No. Test-1 Velocity History - Test d104 ....................54 5.4 mpport Drag Force History - Test d203 . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 5.5 Prototype No. Test-1 Derived Overturning Moment History - Test dl87 ......56 5.6 Prototype No. Test-1 Effective lever Arm - Test dl87 .................57 5.7 Prototype No. Test-1 Free Vibration Acceleration - Test d198a ............58 5.8 Prototype No. 2 Free Vibration Acceleration - Test d598 ................59 5.9 Prototype No. 2 Free Vibration Load Cell FZ1 Force - Test d598 . . . . . . . . . . . 60 6.1 Recommended Drag Coefficient Values ...........................,66 6.2 Smooth Impervious Strainer Drag Force - Test d472 ................... 67 TR-ECCS-GEN-01-NP Revision 2 vii i a
l i INDEX OF NOTATIONS AND VARIABLES A- projected area normal to flow (ft2 ) , C absolute damping ObWin) C,, critical damping (IbWin) j C, hydrodynamic standard (velocity) drag coefficient j C. hydrodynamic acceleration (inertial mass) drag coefficient i 5 logarithmic decrement dU/dt acceleration (ft/s') F, hydrodynamic standard drag (velocity) force component Obs) F, total hydrodynamic force (Ibs) ! F, impulse force Obs) F, hydrodynamic acceleration (inertial) . drag forces component Obs) f frequency (Hz) ; p water mass density (= 1.9366 lbf-s'/ft') ! U velocity (ft/s) V displaced enclosed volume (ft') j W strainer air weight Obs) ! W, inertial mass weight Obs) l W, weight of support assembly from the adapter up to and including horizontal load cells Obs) w undamped natural frequency (Hz) , w, damped natural fiequency (Hz) X peak amplitude of response j l I I l
)
TR-ECCS-GEN-01-NP Revision 2 viii l
i l
1.0 INTRODUCTION
i 1.1 Background i The installation and use of large-capacity passive suction strainers is a planned ) modification to allow BWR operators to comply with the new USNRC l requirements for Emergency Core Cooling System (ECCS) (Reference 1.1). The subsequent analysis for qualification of the new installation requires calculation of hydrodynamic loading typical for submerged structures in a BWR suppression pool. 2 The hydrodynamic mass for the structural analyses is currently based on an inertial mass coefficient, C., of 2.0 (added mass coefficient of 1.0). No i empirical data has been used to develop or substantiate this value, consequently l the default value of 2.0 is being used. In view of the perforated nature of the ! strainer, and the end effect for bolt-on stacked disk strainers, it is believed that i this is a conservative value. Literature surveys have not revealed any ! empirically-derived values for C, that would be relevant to the strainers in this , or any other application. l On this basis it was believed that the most pragmatic approach to substantiating a C value for use in structural qualification analyses was by undertaking a ! relatively simple hydrodynamically-based experimental derivation of C, for one l or more prototypical stacked disk bolt-on strainers. The subject test program was undertaken by Duke Engineering & Services, Inc. ; (DE&S). The experimental investigation was designed and managed by Digital Structures, Inc. (DSI) and performed at the Offshore Model Basin (OMB). 1.2 Approach I The subject test program was designed to obtain a C value by application of basic fluid mechanics related to the forces on a cylinder due to fluid flow. The empirically-based Morison equation for separated flow around cylinders has provided a useful and somewhat heuristic approximation (Reference 1.2). The forces consist of a drag component and an inertial component. The drag component is proportional to the square of the fluid velocity (relative to a fixed cylinder) whereas the inertial component is proportional to the fluid acceleration.
- Changing the frame of reference, the same force components exist when the cylinder is accelerated through still water (i.e. the relative motion between the fluid and cylinder are maintained).
TR-ECCS-GEN-01-NP Revision 2 1 l
By measurement of the total forcet ;o accelerate a body through fluid and a separate measurement of the keg forces and body acceleration, the hydrodynamic inertial forces can be derived and thus an effective mass coefficient C, can be determined. 1.3 Objective l The purpose of the test program was to generate the data required to develop an empirically-based value for the hydrodynamic inertial mass coefficient, C., for use in qualification calculations related to installation of replacement ECCS suction strainers in BWR suppression pools. Other related hydrodynamic properties were also determined. Lateral hydrodynamic loads (flow normal to the axis of the strainer) are the major concern and were the focus of this test program. Structural loads imparted on the strainers due to axially-directed flow (along the strainer axis) are typically of much smaller magnitudes and may therefore be estimated using classical I hydrodynamic formulations. Hence, flow oriented along the strainer axis was i not addressed in this test program. 1.4 Report Layout l The scope ofinvestigation including a description of test specimens is summarized in Section 2. The facility and test equipment are described in i Section 3 and Section 4 provides an outline of the test procedure. The test results are presented in Section 5 and discussed in Section 6. Findings and i conclusions from the tests are summarized in Section 7. References are provided in Section 8 and Appendices A and B contain test instrumentation descriptions l and calibration data, respectively. 2.0 SCOPE OF TEST PROGRAM 2.1 General Description of Experiments l l The test program consisted of hydrodynamic experiments on two typical ECCS bolt-on stacked disk strainers. The test strainer was towed through nominally still water, with the strainer axis oriented nonnal to the travel direction. Various kinematic conditions were investigated. A reference cylinder and a reference l TR-ECCS-GEN-01-NP Revision 2 2
non-perforated stacked disk assembly were also tested for comparative purposes. Several nominally-constant velocity conditions were attained to determine drag effects and obtain appropriate values for drag coefficient, C,. Thereafter, testing under accelerated motions (simulating accelerated flow effects) was performed. Free vibration tests (quick-release " pluck" tests) of all the specimens in the submerged condition were also undertaken. Subsequently, the hydrodynamic inertial effects on the test strainer were derived, from which an effective nominal coefDcient of hydrodynamic mass, C., was calculated. 2.2 Test Specimens The two strainer test specimens for this program 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 2) for nominal 10-inch pipe, whereas the latter is a large i 13-disk strainer (170 ft2) for 24-inch pipe, detailed respectively in the PCI shop drawings, References 2.1 and 2.2, and shown in Figures 2.1 and 2.2. The disks 4 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 2.3 and 2.4, 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. The projected net lateral frontal area of the small and large strainer was 2 respectively 5.28 and 12.0 ft2 (gross areas of 6.48 and 14.33 ft ), The test strainers were also weighed at the test site. The air weights were 305 I and 948 lbs respectively for the small and large strainer (including the internal suction Dow control device). Enclosed volumes were 9.04 and 26.27 ft' (12.40 and 36.35 ft' gross). The associated water displacements were 564 and 1638 lb , I (777 and 2267 lb gross). A Reference Smooth Test Cylinder was fabricated by wrapping the small strainer l 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 ) TR-ECCS-GEN-01-NP Revision 2 3 L ,
plastic board and secured to the perforated strainer using the same kind of self-drilling sheet metal screws (shown in Figure 2.5). The resulting cylinder was 33 inches long and of uniform 30 inches diameter (up to the flange). The cylinder weighed 324 lb in air and had a total surface area (including free end) of 26.5 ft'. Because the wrapping extended up to the flange, the total projected lateral area, 6.875 ft2, of the Reference Test Cylinder was slightly larger than that for the gross enveloped projected area of the Small PCI Strainer No. Test-1 (6.48 ft2) , The purpose of the Reference Cylinder Test was to provide a basis for i comparisons with the perforated strainer and standard cylindrical shapes, with end effects. l I I 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 entire strainer, as shown in Figure 2.6. Several 1/8 inch holes were punched through the plastic at the free end to allow flooding. The air weight was 308 lb and the total surface area, including spool was 66 ft2 . The projected net lateral area was 5.28 ft2 (gross " envelope" area of 6.48 ft2 to outside profile). l The purpose of this test specimen was to provide a direct comparison with the perforated stacked disk strainer. j l l l l l l TR-ECCS-GEN-01-NP l Revision 2 4
[', , 1
.g b :$
- - . UI' g
' ,.ew.;
(!g j l C ' y u. y !
- -V.WdH4p+
k
&g.yW '?'-
+ -ur..e +
{.:n ' 4 .., I i,;,4N2:SnQ{ 34 q l l
'~
4 l$N'f-
- u. ' **:'"."Y1;;;
'...,M
- v: -
'. ?$ :
2 7 <-
' .;?ti z-
,.g.. ..:y..
,.e ~
4
. ..+1Wil;.Q';;.'y. _g ua.p; lk*f. . [
- y .h FIGURE 2.1 PCI SURE-FLOW" STRAINER PROTOTYPE NO. TEST-1 TR-ECCS-GEN-01-NP Revision 2 5 i . p
1 p+ a+
.; ,X " %
.nW*
y - __
,,8 N 'v a-- ,-- . -
dyj, *? c l i i. l FIGURE 2.2 i PCI SURE-FLOW" STRAINER PROTOTYPE NO. 2 TR-ECCS-GEN-01-NP Revision 2 6
f 33 1/4* _ 3W 29 7W 3 5/16" I (TYP) 7 M 3 +$ no - - - - __ Oz o -~_. r_ r. :- . : .,
+ +
7 ., _ _ -. _ .... _. , o . } aj il S8" CARBON STEEL PLATE E I S 1/4" CARBON STEEL PLATE - 11 GA. C S. PERFORATED PLATE WTTH if $ HOLES AND 40 % OPEN AREA - (TYP UNLESS NOTED) W i I I
';j ' y '
1 e
^
,,,,a-e e
STFFENERS,1/8" C.S. PLATE OR LESS NOTE STFFENER ORIENTATION MUST BE DENTCAL ON EACH DISK FIGURE 2.3 PCI SURE-FLOW STRAINER PROTOTYPE NO. TEST-1 ) TR-ECCS-GEN-01-NP , Revision 2 . 7 i D_-L._-__._-_ _ - - - _ _ - - _ - _ - _ _ - - - _ _ - _ - - _ - -:-. - _ - _ - _ - _ _ _ __ _ __ _ _- - ._ ._ -_ ..
l' 1. l-l l' 1-l l l: l 54" i l , 6 117 er l = = = 2 3r srAx
=- _=
l L l V
~ '" ~ - - - - - ~ ~~ ~~
18 l; g { n - -. -. - - - - - - - - th n
= . .
g - . . . __ . _ . -_ _ -. ._. _ - - . l
" 9 l: g -.:- :.-; : -_:- = -_- : --
i fB 7 1
- 1/7 OHEN STIE. R.A1E 1 M STMX
- l. _
I 1/d' OtfMN STEEL J R^* . r ae r (TP 12 nAan l FIGURE 2,4 - l. OUTLINE OF PCI SURE-FLOW STRAINER PROTOTYPE NO. 2
. TR-ECCS-GEN-01-h?
Revision 2 - 8 n . _ _ _ _ _ _ _ _ _ - _ _ _ _ _ _ _ _ _ _ _ _ _ _ - _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ - _-__-
,.W*,'
+* e w
..: m
- J'Y <
e I 4 l \ l i I FIGURE 2.5 REFERENCE SMOOTH TEST CYLINDER TR-ECCS-GEN-01-NP Revision 2 9
e g' l
'h l '
i l - i l l (e:c. 4 FIGURE 2.6 REFERENCE SMOOTH IMPERVIOUS STACKED DISK STRAINER TR-ECCS-GEN-01-NP Revision 2 10
3.0 DESCRIPTION
OF TEST EQUIPMENT 3.1 Test Facility The tests were performed in accordance with the test specification (Reference 3.1) at Offshore Model Basin's (OMB) Towing / Seakeeping Basin located at their facility in Escondido, California. The basin is 295 ft (90m) long, 48 ft (14.6m) wide and 15 ft (4.6m) deep. An overview and layout of the basin is shown in Figure 3.1. 3.2 Test Equipment The OMB Towing Carriage, powered by two 30 HP DC electric motors, spans the basin and rides on rails (see Figure 3.2). Depending on the drag load, the Towing Carriage provides towing speeds ranging from 0.05 ft/see to 18 ft/sec with computerized speed control and was used to tow the submerged test specimen through the basin. The OMB Subframe, Figure 3.3, was attached to the towing carriage, so as to provide three-point support of the test specimen in the submerged arrangement. The load-measuring devices were attached to each of the three legs of the subframe as indicated in Figure 3.4 and 3.5. The Subframe weighed 152.9 lbs bare, and 205.7 lbs with the six (6) load cells and their mountings. The DSI/OMB Strainer Adapter is a stiff three-legged Y-shaped fixture for transferring load from either strainer flange to the balljoints of the load cells on the subframe (see Figure 3.6 and 3.7). The strainer was bolted to the adapter with two bolts per leg, six bolts in all (7/8 inch and 1-1/4 inch diameter bolts, respectively, for the small and large strainer). The adapter, as used (with zinc anodes), weighed 179.3 lbs. The DSI/OMB Test Specimen Boundary / Flow Deflector, (B/FD) an octagonal 3 horizontal steel plate (3/8 inch thick, 60 inch dimension across flats) surrounding the adapter (Figure 3.8), was designed to prevent (or suppress) surface waves. It was connected to the subframe, above the load cell location, with three braces as l shown in Figures 3.9 and 3.10. A small gap (approximately % inch) separated ! the B/FD from the adapter as shown in Figure 3.11. A 5 inch high bulwark on the forward edge was designed to minimize flow around the adapter (extraneous drag load). The load cells only measured extraneous flow loads from the I adapter, not the boundary /subframe assembly. The B/FD weighed 269.1 lbs. TR-ECCS-GEN-01 t ? Resision 2 11 l l
I 3.3 Test Instrumentation The primary instrumentation consisted of the following transducers, detailed in Appendix A, and located as shown in Figure 3.11: Six independent strain-gaged load cells (I-beams) to measure the force history applied to the test specimen for the duration of each test. Three of these, FXI, FX2, FX3, measure longitudinal shear and were summed to provide the total horizontal applied force, X-Force. The other three, i FZl, FZ2, FZ3, measure vertical loads and were used to determine the overturning moment applied to the test specimen during the test. Each ; load cell was custom-built from a 4 inch cube aluminum block and waterproofed for submerged operation.
- An independent acceleration transducer (accelerometer), ACCX2S, j mounted on the adapter above the test specimen flange, was provided to !
measure test kinematics and verify local test specimen motion and i compare with the programmed motion of the towing carriage. Support flexibility effects could thus be taken into account. The adapter , accelerometer was waterproofed for submerged operation.
- The carriage velocity was measured by the tachometer located near a carriage wheel.
Secondary instrumentation consisted of stop watch and standard measuring devices (tapes, calipers, etc). 3.4 Data Acquisition A block diagram of the data acquisition system used for this test program is shown in Figure 3.12. All transducers used provided analog signals. The analog input section includes an input multiplexer. Signal scaling is provided by a high-performance, differential input, programmable gain amplifier (PGA). The 12-bit A/D converter can be configured for different input voltage ranges to 110 volts full scale. A hardware channel scanner enhances high-speed and DMA (Direct Memory l Access) performance. Essentially, the A/D Converter Board writes analog ( transducer voltage data directly to disk via an internal timer when operating in i the DMA mode. l l TR-ECCS-GEN-01-NP Revision 2 12 l
l l The PC applications package 386-MATLAB (Reference 3,2) was used to ccnven , all data to engineering units and to perform other basic data processing. The output from this processing includes data files that were plotted. l Note that the calibration procedure was end-to-end (transducer input to processed digi'.al output) to eliminate the need to calibrate any and all parts of the process 1 and thus simplify quality assurance (QA) of the data collection. I i l l TR-ECCS-GEN-01-NP Revision 2 13 , L l
g J n os _ e I a _ t s _ A. 0
- A t'
s N 4% O i i I T C E n - r S r t wtA oL 0 _ tP nt 1,?I ea v t _ oi cs - [ P E n
~
lA E D , 3'.t i, __ 4 0- I 9' 9 1 3. _ E _ R U _ G I F _ 4 r e _ s _ I N _ A M ( 0 n kg D R A O ' B E , V . A - W he J _ ?moOMhNZ . k5
; sJ -
_ Q;c5: t 5 m -
.;s .f;n; .
..pn 4 , ;.. .,_. --
s.g, .. y ~ ,
', f:
~
n .h .
>; " ,, , ^_
,. .X-Q h $ -
;..N.
.-;3 ' *Atu$'t s
& w w. -w 3' ,
j9
- f .
L ,_ ,~ ' y A n-
. . .< ..;. t -
g.
. *, p . M. <
i ir. a=* \ (( ty I [;: " '
. .I
*^
t.g$
+v b,
g.
' e, e . !
i
' 'l'?b- n: $
l 1 _z ,, -: g .;(L ,, e$$'W1Y:f
^
f,
- m. .- -
m ,,4
.s\
. . .n , .
N m g, ! en .
^~. . $w
l l 3-
..'{..,
+a , '. l f
Q I I 2 FIGURE 3.2 OMB BASIN AND TOWING CARRIAGE TR-ECCS-GEN-01-NP Revision 2 15
1
-)
- 39 5/8" l.
& 5 a 6-1/2 x 3/8" f^ (TYP 2 PLACES) l L 'g
' .. -\ \ , (T.S. 5 x 2 L
\ T.S.1 x 1 (1YP) g # S. 3 x 3 (TYP) h -
l. i-l 2
.If I 1 l . ~
( 4x6x172' (TYP 3 PLACES) i FIGURE 3.3 A OMB SUBFRAME ARRANGEMENT (REAR VIEW) TR-ECCS-GEN-01-NP-
- Resision 2 - 16
c____.-. _ l 1 l I i 31" '
-e = l 61/2"
~r 1
i i I I l _____ I
\ T .S. 5 x 2 l
I i i l l 1 l 6" m-m FIGURE 3.3B OMB SUBFRAME ARRANGEh1ENT (SIDE VIEW) TR-ECCS-GEN-01-NP Revision 2 17 l l
i 1 l l 1
. s' '.<:'
)
--~~~..
\
c e9 Y _ p., : e .- d'
,/ .
- s w ,
h12;acA EWM'.. M a t $ 4 . n . ' 1
~
. J jff$l? I /-
- f% .cfN*y;s? ny)A%"ff!$U i
;_,. . . 'Nh, f.'h{ . _
1 i l l l FIGURE 3 4 OMB LOAD CELLS TO SUBERAME ARRANGEMENT TR-ECCS-GEN-01-NP Revision 2 18
5 x 61/2 x w S* _ [
~
l . , (========================; l I
,'1 i
'l a
I i l i i
, i <
I 1 I I 3 1 l TS3x3 -
.g l '
. .' l ll 4 i 57 f/8" l
.. s i -
- l~<i i
i ll , l!
, k, I i 1 ll l l
_______________..__________r
. [ PL 4 u 6 1/2"
HORIZONTAL
]
f 3 l hLOAD T f csLL
^- '# '#
- l. i ," , / aALL XNNT
~y 7 E" "
2)/2-LL w tw f LOAD CELL
' \ STRAINER ADAPTER t.
1: u FIGURE 3.5 OMB LOAD CELL MEASURING SYSTEM ON SUBFRAME 1' TR-ECCS-GEN-01-NP !; Revision 2 19 L
; ,) ll :j b, -
V*E-
, 50 v.
g ; p-n c q;
.~ ?'
pgp n g lE. .;# -ij. .- , I- 4 $ 9 - l, pf Gi ' .k ..
&y a
4 l
~ i'
- l': g,j u .J
., c, mgt, ..
- .< lj .
) s*r ,, - -
~* *%f ?
~
j' 3 ,
.3 -
j 9 4 j ' g ., > l f)snMr- o . b dyM . w ~ _ ,
.w5iM m j b ~#, ".. . ..
&$$;gg FIGURE 3.6 DSI/OMB SUBFRAME WITil STRAINER ADAPTER TR-ECCS-GEN-01-NP Revision 2 20
35/8"o T
,# ' 8 a 1 ild's
/ I f N
/ f N
~
/ s- \
/ / i ,'s 6 x 7/8"o p
-/ / s \
/ / \
/ / \ 6
/ /
M [ \ **91 " \\
/ / M., %. ' ' \
L Is\ \ \ I I l ' c io n s . w I 1- 4 . (r m
# \ *S. f
^< ~
\ sN /
\ s. / /
N
~~__ '
/
/ b
~\ /
- s. f
% /.
~~____ - l I
FIGURE 3.7 LAYOUT OF DSI/OMB STRAINER ADAPTER 4 I l 9 l TR-ECCS-GEN-01-NP Revision 2 - 21 j l_ , t ! l:
\. l; 1 l I i i
! ) SUBFRAME LEG l 1 A
l I 3x, BRACES TO SUBFRAME l r p /l. .
& E r
. sx l:
SECTION A-A BULWARK /
/
/ ?
L A A~
.pwog i t j CUTOUT TO CLEAR ADAPTER - 1/2"
- /
k
\
60" FIGURE 3.8 j LAYOUT OF DSI/OMB TEST SPECIMEN BOUNDARY / FLOW DEFLECTOR
-' TR-ECCS-GEN-01-NP 22 ;ij..~ < Revision 2 Lh ;
i ;i
nse ..
==
(I y <- momensur-f'4 . .km.p
/
W q k r' '" q , M$ ~ +- jgp', .'g; * . - - ogw y. A; e ng 6: ' ' , j', ;. y :;- 7 . u+ n??'%m.
- r. c
-l . _ - l. ntq g
r;3 .,
.: g >-
q;
.s, ) >
.. . s
+~
.. [. S <
. - y j
.6
.~ . '._ gt,p.;~ ,
...,A :
mg ., ,,
;) . .. .
o i l I s . O f;. . . % 4 g.- YJ
)6 . 3'% .,
sk. ,g ' [W age
- W e
5.*;L . - ,
.m%
^
8
'-l Eft ' ' ?h/s . -
h; bhk, ? FIGURE 3.9 DSI/OMB TEST SPECIMEN BOUNDARY / FLOW DEFLECTOR TR-ECCS-GEN 01-NP Revision 2 23
i
)
j l 1: l h T U
/
-)
,N
.* vo"" *""" -
,/
/
/
"IO',*rLm m [ fa,;"
__i d j^ mo < rr _ l g .._. $._ _ M__ .. ( $@ ' g i gN r,r a .
\ _
i) I
\
- 's
(
= " =
1 FIGURE 3.10 DSI/OMB TEST SPECIMEN BOUNDARY / FLOW DEFLECTOR WITH STRAINER ADAPTER TR-ECCS-GEN-01-NP Resision 2 24
F T '1 s p! OMB
/ s
\
, TOWING CARRIAGE ./
A
\'s s
/ \ l /
\ '3 t ,
i
<[/
l/ '
'\ l , .. y
__a.,_ r - (: ) - L.- ; >
;- /j! t
)
f I f n i OMB SUB-FRAME , ACCX2S ACCELEROMETER i 4
~. .. . ..
F1X. F2X. F3X - LATERAL LOAD CELLS ,. _
] l'~~~~'
(LBEAM GAGES) ..;_ . ;, _ ; F1Z, F2Z, F3Z VERTICAL LOAD CELLS I h *
*l (LBEAM GAGES) f r '
ACC2XS jl , a} . 1 BOUNDARY / FLOW DEFLECTOR -
===.__
= _ , _ _
---.6.
=r-r-j 2,
TEST SPECIMEN .~ (PCI PROTOTYPE No 2) c_ g-[- , _ _ _ w
. _ , . a.
i FIGURE 311 LAYOUT OF OMB LOAD-CELL MEASURING SYSTEM ON SUBERAME TR-ECCS-GEN-01-NP Revision 2 25
i i i l 1
,. v t
I I I r ', !
'"~
o"a ANALOG INPUT 4 ANALOG --] N EA / s MoG WUT SIGNAL ! ouAcoNTaouER '
, i CONNECTOR l Y I q ,
s _ __.tkwxp>sy,- ,% -- >.---.w T o/ _ E 1Q4( a ; i n, l bS' 6
, l 1 .
8
'.M
-_...._d' i ,
' ; 'e i .
! Transducer j DIGITAL OUTPUT l' Post
! l\ l Conditioning ;
i
! 'l ; j Processmg I Plots Data Files: i ;
4 l i
; j l , 1 J L i j
./ :
l
! L. i l Transducers i Load Cells Accelerometer . 4 1
FIGURE 3.12 BLOCK DIAGRAM OF DATA ACQUISITION SYSTEM TR-ECCS-GEN-01-NP Revision 2 26 I i
4.0 TEST PROCEDURE 4.1 Test Matrix Separate series of tests were undertaken for the small Prototype No. Test-1 Strainer (100 Series) and the large Prototype No. 2 Strainer (500 5 ies). In addition, tests were performed for; the adapter / boundary assembly alone (i.e. without a test specimen attached) (200 Series); the reference smooth test cylinder (300 Series); and the reference smooth impervious stacked disk (400 Series). The tests conducted are indicated in Tables 4.1 through 4.5. The final test selection was dependent on the outcome of prior tests and was determined during conduct of the tests. The order of the tests in general followed the Test Number sequence shown in the Tables 4.1 through 4.5. The calibration checks are also indicated. The initial tests for each series consisted of a slow build-up (approx. % ft/s') to a relatively constant velocity (nominally zero acceleration) as shown in the example target travel history of Figure 4.1, with the aim of establishing the drag coefficient for the test specimen. The sequence began with low terminal velocities of 2 ft/s, building to the high velocity of 10 ft/s in increments of 2 ft/s, so that velocity dependence of C,could be investigated. Several tests were repeated. The later tests for each series were at increasing accelerated flow to a prescribed terminal velocity, with the aim of generating hydrodynamic inertial forces so that the mass coefficient for the test specimen could be derived. The target accelerations ranged from a low value of 0.5 ft/s2 to the high value of 3 ft/s 2, (This proved to be the limit for controlled motion of the towing carriage and in some cases, with large drag, was beyond the limit). The accelerated and decelerated stages had the same nominal absolute value. An attempt was made to attain higher accelerations for short duration travel but control of the towing carriage was unstable and concern for equipment safety precluded higher accelerations being attained for the test specimens. In several cases the target accelerations could not be attained. Repeated free vibration (pluck) tests of each specimen in the as-installed submerged condition were also undertaken and provided very consistent data. Several towing tests were also repeated, based on either the desire to determine repeatability, to obtain more data for a particular situation, or in the case of TR-ECCS-GEN-01-NP Revision 2 27 l
)
J l l suspected equipment malfunction. 4.2 Sequence of Testing Operations Each test series consisted of several separate stages: ! (a) Presetting and Verification of Planned Test Travel l The following sequence of operations occurred during travel setting, undertaken before the first series of tests: l Programming the planned test motion sequence (travel) in the 4 controller for the towing carriage. The planned distance for each I test was 200 ft.
)
- Running the towing carriage through the programmed travel and recording motions via the data acquisition system.
Recording independent motion measurements of the carriage (distance and time, using tape measure and stop watch).
- Comparing independent and instrumentation-acquired motion measurements.
- Reconciling any differences.
(b) Test Specimen / Load-Measuring System Installation The following sequence of operations occurred during test specimen installation:
- Mounting the instrumentation (load and acce!eration transducers),
Adapter and Boundary / Flow Deflector to the Subframe.
- Checking load cell preload and minimizing initial strain by shimming supports at bolt locations a Mounting test specimen to the subframe assembly. g l l l . Mounting the rubframe with attached test specimen and j
( l TR-ECCS-GEN-01-NP ! Revision 2 28 l l
.__________-______-__L
)
instmmentation to the towing carriage. The assembly was lifted into the basin and floated with ancillary buoyancy during the installation.
- Calibrating all instrumentation (per procedure below) in the as-installed condition.
(c) Towing Testing / Data Acquisition The following operations occurred during each towing test:
= Beginning with the first test in series, all data (load on strainer and strainer acceleration and velocity) was recorded by the data !
acquisition systen, during conduct of the test. The standard data acquisition rate for towing tests was 8 samples per second for each channel.
- Following each test, the data was processed and plotted as a history of the appropriate response versus time for the test duration.
- After each test the towing carriage was returned to its original position at a slow speed to minimize wave generation.
- Preliminary checking of the test data was undertaken to determine if recalibration was required.
Subsequent tests followed the same general procedure. (d) Free Vibration Testing / Data Acquisidon The following operations occurred during each free vibration test:
- A load of approximately 200 lbs was applied to the test specimen using the hanging weight load calibration system shown in Figure 4.2.
- The load was quick-released by cutting the line and the test specimen underwent submerged free oscillation.
. Response data (load on specimen and acceleration) was recorded l
l ! TR-ECCS-GEN-01-NP Revision 2 29
l by the data acquisition system during the test. The standard data acquisition rate for free vibration tests was 50 samples per second for each channel. 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. 4.3 Measurement of Strainer Weight and Dimensional Properties The test strainers were weighed and the center of gravity determined by measu'rement (by balancing, single-point suspension and two-point weighing). The signincant geometric dimensions, as indicated in the outlines of Figures 2.3 and 2.4, were checked and significant discrepancies noted as indicated in Section 2.2. 4.4 Transducer / Instrumentation Calibration l All transducers were calibrated and checked prior to testing and as shown in Tables 4.1 through 4.5. The complete calibration data is provided in Appendix B. I j The calibration procedure was an end-to-end process (input to output) to j eliminate the need to calibrate any and all parts of the process and thus simplify i QA of the data collection, i Load calibration checking consisted of applying an independently measured force
. to the test specimen in the as-installed arrangement. The loads were applied in ,
100 lb increments to cover the range from no load to 500 lbs. The load was l applied to the test specimen by a stout line attached to the specimen near the free end. The angle of the applied load to the horizontal (perpendicular to the strainer axis) was calculated from geometric measurements to the anchor. In all cases the angle was sufficiently small so that the horizontal component of the l force was approximately equal to the applied force. The applied load was
- l. measured using a reference load indicator (proving ring), which in turn was calibrated using weights traceable to National Standards (NIST). The load cell output, after conditioning and undergoing data acquisition was recorded as a data file and plotted.
TR-ECCS-GEN-01-NP l- Revision 2 30 l
l The recorded data values and plotted output were compared and reconciled with 3 the applied load. No discrepancies (within reasonable tolerances of f 2%) were . I evident throughout the test program. Motion calibration consisted of acceleration and velocity measurements of the towing carriage.- Distance and timing measurements were used to verify the nominally constant-velocity and uniform-acceleration motions. j Acceleration due to gravity was used as the reference for acceleration calibration . (rotating the accelerometer through 180 degrees from upward orientation to downward orientation corresponds to a change in acceleration of 2g, from +g to 1
-g). Smaller rotations (up to 15 degrees) were used to calibrate to low l accelerations. The rotations were applied by means of an angle computer.
4.5 Test Data Collection Each test run was labeled with a unique number for test results data identification purposes as indicated in Tables 4.1 through 4.5. The measured data for each test run was recorded by the data acquisition system and reviewed immediately after the test. l 4.6 Test Data Analysis -] l Preliminary analysis of the acquired data consisted of plotting all measured i responses as a function of time, and checking against independent measurements I l of parameters (e.g. time and distance) where possible, j l g For guidance, values of drag forces, F , at different velocities, U, with L assumptions of 0.6 and 1.0 for the drag coefficient, C,, based on projected area j normal to flow, A, were calculated, as indicated in Table 4.6. All calculations were based on a water mass density, p, of 1.9366 lbf- 2s /ft' (20 C*). F, was determined using the classical relationship (Reference 1.2)- l l F,_=jC,pA44 Eg[1] Similarly, values of inertial forces, F., at accelerations, dU/dt, of 1.5 and 3.0 l ft/s2, with assumptions of 1.0,1.5 and 2.0 for the inertial mass coefficient, C., based on displaced enclosed volume, N , were also calculated, as indicated in Table 4.7. The total weight is the specimen weight, W, plus the hydrodynamic TR-ECCS-GEN-01-NP Revision 2 31 c L _ _ _ _ _ - . . _ _ - . _ _ _ .
- - . - - _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ J
i I weight, CgpgV (contained and added mass). F, was based on the widely L accepted relationship: F = C, p V dU/d/ Eq[2] 4.7 Test Monitoring l All tests were monitored and witnessed by qualified test engineers. l l l
\
i l. TR-ECCS-GEN-01-NP Revision 2 32 1 i l
n TABLE 4.1 MATRIX FOR 100 SERIES TESTS SMALL STACKED DISK BOLT-ON STRAINER PCI PROTOTYPE NO. TEST-1 Target Target Ts Velocity Accelemtion Comments N&r (ft/s) (ft/s ) d100 d101 2 0.5 d102 4 0.5 d103 6 0.5 d103a 6 0.5 d103b 6 0.5 d104 8 0.5 3 d104a 8 0.5 g d105 10 0.5 8 d105a 10 0.5 5 a: e d1051 6 1.0 .g d1052 10 1.0 g dl61 6 1.5 e dl62 10 1.5 2 dl71 6 2.0 h dl72 10 2.0 E dl81 6 2.5 $ d182 10 2.5 Q dl85 6 2.8 dl86 6 3.0 dl87 10 2.8 d188 10 3.0 d198 d198a d198b d198c d197 TABLE 4.2 TR-ECCS-GEN-01-NP Revision 2 33
i 1 l . MATRIX FOR 200 SERIES TESTS ? i 1 DSI/OMB STRAINER ADAPTER / BOUNDARY ASSEMBLY ALONE l Target Target Test Velocity Acceleration . Comments Numkr (ft/s) (ft/s ) d201 2 0.5 d202 4 0.5 d203 6 0.5 $ d204 8 0.5 $ d205 10 0.5 $ a: d252 10 1.0 .0 d262 d272 10 10 1.5 2.0 e l d282 10 2.5 3 d283 10 2.8 @ d286 6 3.0 5 d288 10 3.0 y c. V d298 d298a d298b I ! l TR-ECCS-GEN-01-NP ! Revision 2 34 i
l TABLE 4.3 MATRIX FOR 300 SERIF 9 TESTS REFERENCE TEST CYLINDER WITH BOUNDARY - 30"& X 33.25" LONG Target Target TW Velocity Acceleration Comments Number 2 (ft/s) (ft/s ) d301 2 0.5 1 d302'- .4- 0.5 A l
.d303 6- 0.5 1 d304 0.5 $
j 8 d305 10 0.5 e d352 10- 1.0 j d362 10 1.5 @ d372 10 2.0 @ d382 d383 10
'10 2.5 2.8 55
,d386 6 3.0 ig d398- )
'd398a ,
d398b i I f ., : k I l l l TR-ECCS-GEN-01-NP - Revision 2. 35 C 1_z _x _ _. .= - __ __ _ _ _ _ - _ . _..__-_____a
l TABLE 4.4 l MATRIX FOR 400 SERIES TESTS REFERENCE IMPERVIOUS STACKED DISK ASSEMBLY COVERED PCI PROTOTYPE NO. TEST-1 l Target- Target Test Vel city . Acceleration Comments Number 2 (ft/s) (ft/s ) d401 2 0.5
.d402 4 - 0.5 3
.d403 6 0.5 7 d404 8 0.5 $
- d405 10 0.5 - 5 ce c .
l, d452 10 1.0 e 1 N d462 10 1.5 $ d472- 10 2.0 g d482 10 2.5 N d498 d498a
-[
e d498b- Q d498c d499 l 1 I l TR-ECCS-GEN-01-NP Revision 2 36 i _ . . _ _ _ ._____._._____________w
i i TABLE 4.5 l MATRIX FOR 500 SERIFS TESTS LARGE STACKED DISK BOLT-ON STRAINER PCI PROTOTYPE NO. 2 Target . Target Test g , Velocity Acceleration Comments (ft/s) (ft/s') d501 2 0.5 d501a 2 0.5 d502 4 0.5
'd503 6 0.5 d504 8 0.5 ^
d505 d505a
~8 10 0.5 0.5 '
}
5
~
d552 8 1.0 g
- d562 8 1.5 'iii d572 8 2.0 E d582 8 2.5 $
d587 8 2.8 6 5 d598 fE. l d598a 2 d598b v d598c i d599 1 d599a l 1
.TR-ECCS-GEN-01-NP Revision 2 37
TABLE 4.6 CALCULATED DRAG FORCES (Ibs) Projected Relative Drag Coefficient . Test Area Velocity Specimen (C) A U (ft') (ft/s) 0.6 1.0 2 12 20
.Small 4 49 82 5.28 PCI Protots (6.48) 6 110 184 No. Test-1 8 196 327 10 307 511 2 28 46 Large 4 112 186 PCI Strainer - 12.0 6 251 418 Prototype - (14.3) 8 446 744 No.2- 697 10 1162 2 16 27 Reference 4 64 107 Cylinder 6.93 6 145 241 30"$ x 33%" 8 258 429 10 402 671 Note: Projected area is net frontal area projected normal to flow direction. Gross envelope projected areas for the stacked disk strainers (including area of disk slots) are shown in parentheses.
i
, I i
[ TR-ECCS-GEN-01-NP l Revision 2 38 u ,
' . . _ ~ _ - -
TABLE 4.7 CALCULATED INERTIA FORCES Obs) Displaced Acceleration Tod . eg ass Water dU/dt Test Weight Specimen W Coefficient Weight W+C opgV (fusi (lbs) C. pgV (the (Ibs) 1.5 3.0 Small 1.0 564 869 40.5 81.0 PCI Prototype 305 1.5 846 1151 53.6 107 No. Test-1 2.0 1128 1433 66.8 134 ge 1.0 1638 2586 121 241 948 1.5 2457 3405 159 318
# YP 2.0 3276 4224 197 394
- o. 2 Reference 1.0 842 1166 54.3 109 Cylinder 324 1.5 1263 1587 73.9 148 30"& x 33%" 2.0 1684 2008 93.5 187 TR ECCS-GEN-01-NP Revision 2 39 w___-______-____--_____--
c l l l \ 4 200 -- li? l L 3 g 100 -- 2 5 O I 10 - 7 8-E
~ ------- ---
6-- 3 f 4- N e- \
> 2
\*'
10 15 20 25 30 35 40 45 Time (s) FIGURE 4.1 EXAMPLE OF TARGET TRAVEL DEFINITION
' TR-ECCS-GEN-01-NP Revision 2 40
,w ,7 - . __. _ _ - _ __ __ l tovuoso capaM
\ - =- i i
1
-) \ / (- \
N/.=
=.I J
/\ =. %
=
i ie N,. Ti&T SPtCeda r.
)
i (..n v
~;;.
FIGURE 4.2 l LAYOUT OF LOAD CALIBRATION SYSTEM TR-ECCS-GEN-01-NP Resision 2 41
5.0 RESULTS 5.1 Approach to Results Interpretation Consistent with the basic approach to empirical hydrodynamics as applied in the structural qualification of submerged structures in BWR suppression pools, the empirically-based Morison equation for separated flow around cylinders was the basis for interpretation of the test results. Even though the Morison formulation is empirical, there are several theoretical considerations that will lead to the same form as the Morison equation and to numerical values of a dimensionless force coefficient. The inertia, or mass term in the equation is identical with the linear force term derived by potential flow theory, which forms the basis for submerged stmeture loads in BWR suppression pools. The Morison approach considers the hydrodynamic force, F,, to consist of a drag component, F,, and an inertial component, F,. The drag component is proportional to the square of the free-stream fluid velocity, U, (relative to a fixed cylinder) whereas the inertial component is proportional to the free-stream fluid acceleration, dU/dt. The relationship is expressed as follows: F3 = Fs + F. Eq[3] where, Fs = { C sp A Ulm and F,,, = C,,, p l' dUldt Changing the frame of reference, the same force components exist when the cylinder is accelerated through still water (i.e. the relative motion between the fluid and cylinder are maintained). The large basin (width, length and depth) ensures that edge effects are minimized so that the towing velocity is a good representation of free-stream velocity. By measurement of the total forces to accelerate the submerged test specimen through the basin, and a separate measurement of the drag forces and submerged TR-ECCS-GEN-01-NP Revision 2 42
body acceleration, the hydrodynamic inertial forces can be derived, from which an ! effective mass coefficient, C., was determined. The towing test results are analyzed and discussed under the separate sections of constant velocity (zero acceleration) and accelerated motion. l 5.2 Constant Velocity Towing (Drag Forces) The initial tests in each series were used to obtain the drag characteristics of each test specimen. Once the target terminal velocity for a test was attained, the towing continued at a relatively constant free-stream velocity enabling the drag force to be calculated. During this stage, the free-stream acceleration was effectively zero and the inertial forces were accordingly zero so that the total force can be attributed to drag. For the towing tests with the high terminal velocities (10 ft/s) and the low 2 acceleration (0.5 ft/s ), the duration of constant velocity is zero (for example, see l Figure 5.1, a velocity plot of Test d105a). The constant velocity sections of the high acceleration towing' tests were used to obtain drag at high velocities. l The history of total drag for each test was obtained by summing the three measured i lateral loads, FXI, FX2 and FX3. A typical history of the resulting drag, X-Force, for Test d104 is shown in Figure 5.2. The associated velocity history is plotted in Figure 5.3. The tare drag loads generated by the mounting assembly were calculated from the appropriate constant-velocity section of the 200 Series (support and boundary l: . assembly tested by towing alone) as shown for Test d203 in Figure 5.4. These tare drags were subtracted from the drag loads derived from the other towing tests to obtain the net drag forces, Fa, which are given in Tables 5.1 and 5.2. The drag load was related to the net projected (frontal) aca, A, and nominal velocity, U, to obtain a drag coefficient, C,. These calculated C, values are also shown in Tables 5.1 and 5.2. The complete drag results for the two strainers are presented in Table 5.1.
< Proprietary Information Removed >
The drag resJts for the reference smooth bodies are presented in Table 5.2. TR-ECCS-GEN-01-NP Revision 2. 43
< Proprietary Information Removed >
i4 l A plot of the history of derived overturning moment (with respect to the flange elevation) for Test dl87 is shown in Figure 5.5. The resulting lever arm (effective point of application of the total hydrodynamic force) was obtained by dividing the overturning moment by the total force and is plotted for the duration of Test dl87 in Figure 5.6. For the test duration (approximately 4.7 to 23.3 seconds) the consistent effective point of load application (height of I ft below flange) is apparent. After correcting for the adapter assembly loads, this point is > approximately at the center of gravity of the strainer. 5.3 Accelerated Towing (Hydrodynamic Mass) The hydrodynamic mass of the test specimens was investigated by examining the initial impulse phase of the higher acceleration towing tests. At the lower accelerations, the inertial forces are not sufficient to provide robust estimates. The benefit of using the initial impulse is that the initial flow conditions are truly static (zero velocity and acceleration) and specimen velocities do not attain any significant value for the duration of the initial impulse (application of the target j carriage acceleration). Thus the incremental horizontal force applied to the test i specimen is solely the inertial force due to the incremental acceleration from rest to l some small period of time after motion initiation. Results from investigation of the initial impulses for the strainers are presented in Table 5.3. The initial impulse (differential acceleration from rest to first reversal) is listed together with the corresponding impulsive force. The inertial mass (total for the test system below the load cells), W/g, was~obtained from application of basic dynamics (Newton's Second Law, F=m dU/dt). Note that the masses are i expressed as weights, mass g, in the table. l
< Proprietary Information Removed >
1 i The i coefficient of hydrodynamic mass was subsequently derived from the following: TR-ECCS-GEN-01-NP Revision 2 44 l
l1 I i C,,, = (W,- W,- W)/pgV Eq[4] L i I The calculated hydrodynamic mass coefficients for the large strainer, based on enclosed displaced volume, range from < Proprietary Information Removed >. ' These results are not unexpected as discussed below. l- Results for the small strainer indicate < Proprietary Information Removed > A sample result for the reference smooth impervious strainer body is provided in Table 5.4 and indicates < Proprietary Information Removed >. As discussed below, the existence of vortex shedding tended to complicate response for the smooth stacked disk and thus the results proved to be unreliable. l I. l L 5.4 Free Vibrations ! i I The free-vibration response of the quick-release tests on each of the test specimens i in the carriage-mounted submerged condition was analyzed to determine: j 1
- a. Test specimen natural oscillation frequencies I
- b. Test specimen free-vibration damping The dominant oscillation frequencies were obtained by simple measurements from the oscillation history plots. Damping factors, C/C , (fraction of critical) were obtained from calculations of the logarithmic decrement, 6, typically using three or i four cycles of response: j 6 = In(X,,,3/X,,)=2x(C/C,,)(w/w s) - (Reference 5.1) E4 [5]
l Typical acceleration history records for the duration of free oscillation for both the small and large test strainers are shown in Figures 5.7 and 5.8. The associated load history in one of the horizontal load cells is shown in Figure 5.9 which indicates the initial offset due to applied load. Results for the four test specimens are summarized in Table 5.5.
< Proprietary Information Removed >
TR-ECCS-GEN-01-NP Resision 2- 45
< Proprietary Information Removed >
l I l TR-ECCS-GEN-01-NP Revision 2 46
TABLE 5. I 1 CONSTANT VELOCITY TOWING TEST RFSULTS STRAINER DRAG FORCES Projected Nominal Total Support Net Calculated Test Area Velocity Drag Drag Drag 2 Drag Number A U F F, F, F/U Coefficient 2 (ft ) (ft/s) (lbs) (lbs) (lbs) (C,=F,/p AU') d101 d102 3 d103- 5.28 'a d103a $ 4 d104 Prototype 5 d104a No. Test-1 e d105 (Small) j d105a g
~
d501a d502 h
'd503- 12.0
-{
d504 e d505 Prototype Q d562 No.2-d572 (Large) d582-d505a i 1 TR ECCS-GEN-01 'NP
' Revision 2 47 O_______-._-_-_.__-- --_ a
l TABLE 5.2-CONSTANT VEI OCITY TOWING TEST RF5;ULTS REFERENCE BODY DRAG FORCES Projected Nominal Total Support Net Calculated Test Area Velocity Drag Drag Drag 2 Drag Number A U F F, F, Coefficient
?
(ft ) (ft/s) (1bs) -(lbs) (Ibs) (C,=2F,/pAU 2) d301 d302 d303 6.92 e d386 $ d304 Smooth $ d362 Cylinder j d305 3 E 2 5 d401 L d402 h l d403 5.28 E d404 $ d405 Smooth Q d452 Impervious d462 Strainer l I TR-ECCS-GEN-01-NP Resision 2 48
lll1l!l! ! Vg t p n / si e ) s c =, W ai f . , MfeCW o - C i W( t , t ei ghW)bs d e v S Ne o WW(
,l T m L e U tr t R R o h n F S pig , ) s o R E peWl b
( i t a T C S R S uW m r E O fo T F l ah t I n
)
3 G A i t g . s y 5 N TI r e e iWI b r a E I W R I nW ( i t e O E r L p B T NI e s e o r A E R l c ) s P T u r poFb S E I U N mF I ( I I P A M R I T n o S ei L l s t t ) ad2 A1 u e/s pl r Ut /f 1 I med( c N I c I A eI e 8 n pt 54 p 83 et ys e 06 y2 4 6 t s eiib mh) gs t oT 35
==
t o o.91 = TcepW eI ( t o r o Wvpg t oN= r Wvg _ S PN P p r t e 76521 21 2222 sb 8888766 8765 em Tu l l l l l l 1 5555 dddd ddddddd N h?Q6mZNk* _ f$3 @ i' ! ! \ Ill
Vg t p n / si e ) s ic af =, W , MfeCW o - C W, ( S E t , d C t ei h g W )s e v S R Ne ,lb o TO LF WW( R m e U RI A t r t n FT ohg pi
' , )s o RR peWl b( i t
a E T SN SuW m r E I f o TR l t n E iahg i )s I 4 GD t r e e iWlb y r 5 NN ( a E I WIL I nW i t e r L B OY p TC e o A s ec ) r T EH l u r poFb
;s P S
L T l( < U O mF P O I MM n I S ei o LE s t ad2 t ) AC l u r/ s / pleUt T N I f I E med( c NRE I I A c F E R n 4 2 et 2 4 s mhg )s 3 8 t ei ib el TcepW == ( Wgv S r e 6 ts b 8 em 3 Tu d N N mnQ6mZNk Ei5= s $ l l
1 l-t l l L TABLE 5.5 FRFF VIBRATION TEST RFSULTS (. i Critical Test Test Frequency Damp.ing , Number Specimen (Hz) l Ratio d198 Prototype d198a- No. Test-1 A . i d198b T l E d398 ! d398a Sm th j l Cylinder .g d398b E d498 Smooth $ i d498a Impervious g d498b Strainer t c r d598 g d598a Prototype V d598b No.2 d598c I
' TR-ECCS-GEN-01-NP Revision 2 51 L.
P" l
< Proprietary Information Removed >
FIGURE 5.1 VELOCITY HISTORY - TEST d105a TR-ECCS-GEN-01-NP Revision 2 52
I l
< Proprietary Information Removed >
FIGURE 5.2 PROTOTYPE NO. TEST-1 DRAG FORCE HISTORY - TEST d104 l TR-ECCS-GEN-01-NP Revision 2 53
1 1 l i
< Proprietary Information Removed >
FIGURE 5.3 PROTOTYPE NO. TEST-1 VELOCITY HISTORY - TEST d104 TR-ECCS-GEN-01-NP Revision 2 54
1 l l
< Proprietary Information Removed >
l 1 l I l j i 1 1 FIGURE 5.4 l SUPPORT DRAG FORCE HISTORY - TEST d203 TR-ECCS-GEN-01-NP Revision 2 55 !
li i-r i i t 3 l u! '
- < Proprietary Information Removed >
i .. l p l E ( .' l e i
.I J
i I l l y FIGURE 5.5 l 1 PROTOTYPE NO. TEST-1 DERIVED OVERTURNING MOMENT HISTORY - TEST d187
- TR-ECCS-GEN-01-NP I l i
' Revision 2 ~ , 56 i
. .'j:.
- a. .:',, , ,
L.________.. '
1 i l l i l
< Proprietary Information Removed > f l
1 i I l 1
- FIGURE 5.6 PROTOTYPE NO. TEST-1 EFFECTIVE LEVER ARM - TEST dl87 i
TR-ECCS-GEN-01-NP Revision 2 57 [ _ . _ _ _ _ - _ _ _ _ _ _ _ - _ _ _ _ _ _ -
l 1 i l I
< Proprietary Information Removed >
l FIGURE 5.7 '
- t. j i
PROTOTYPE NO. TEST-1 FREE VIBRATION ACCELERATION - TEST d198a i TR-ECCS-GEN-01-NP l Resision 2 58 l
l l l I i l
)
l I l I
< Proprietary Information Removed >
Pages 25 - 59 l FIGURE 5.8 PROTOTYPE NO. 2 FREE VIBRATION ACCELERATION - TEST d598 TR-ECCS-GEN-01-NP Revision 2 59
l' i l
)
< Proprietary Information Removed >
l i l FIGURE 5.9 PROTOTYPE NO. 2 FREE VIBRATION LOAD CELL FZ1 FORCE - TEST d598 TR-ECCS-GEN-01-NP Revision 2 60
6.0 DISCUSSION OF RESULTS 6.1 Approach to Results Interpretation The original intention of using the accelerated flow regime of the tests at the higher accelerations to terminal velocity to obtain the effective inertial mass of each test specimen was not followed. Essentially, there were large variations from a constant value in the test specimen acceleration, due principally to carriage acceleration control through the servo-system and local vibration modes of the carriage structure. This variation made separation of drag and inertia forces difficult and thus use of initial impulse informadon became the preferable approach. 6.2 Coefficients of Drag The range of derived drag coefficients, C,, for the smooth cylinder < Proprietary ] Information Removed > is reasonable when compared with classical empirical data j I as illustrated in Figure 6.1. Reynolds numbers for the cylinder towing tests were within the range
< Proprietary Information Removed >.
( As expected, the drag coefficients for the perforated strainers, < Proprietary , Information Removed > , are much higher than those for the enveloping smooth l cylinder and the artificially non-perforated stacked disk. The perforations were l anticipated to increase drag resistance (due to roughness). The gross surface area
-(porous) of the stacked disk is 2.49 times that of the reference cylinder and the
! higher drag for the former was expected. The net surface area (excluding holes) for ! the perforated plate with 40 percent holes is 1.49 (=2.49 0.6) times that of the reference cylinder. 1 I 6.3 Coefficients of Hydrodynamic Mass The standard inertial mass coefficient of 2.0 for a cylinder refers to the two-dimensional body i.e., an infinitely long cylinder. Three-dimensional correction to C., per accepted ABS rules (Reference 6.1), for the reference cylinder would suggest a correction factor, K, of 0.83 considering the flanged-end boundary l 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). Due to the strainer spool (reduced diameter of flanged-end boundary), the three-dimensional correction for the stacked disk strainers, assuming cylindrical l TR-ECCS-GEN-01-NP Revision 2 61 l l L . _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
i I
' behavior, would be expected to lie between the values derived assuming no l boundary effects at either end and a full boundary at the flange end. For the small i strainer (assuming a cylinder based on the disk diameter) the resulting correction factor ranges from 0.55 to 0.83, and for the large strainer, from 0.65 to 0.88.
Thus significant reductions in the inertial mass coefficient are expected due to the three-dimensional end effect alone. < Proprietary Information Removed >. Additional reduction due to perforations is expected. Although perforations increase drag, they reduce hydrodynamic inertia by allowing flow through a perforated body. They also reduce vortex shedding. l The three-dimensional end effect is expected to be less for the perforated strainer ) than for the impervious sm.ooth cylinder due to the relatively less restricted flow i afforded the perforated body (which is reason for the lower inertial hydrodynamic i I mass coefficient in the first place i.e., less contained and entrained fluid). 6.4 Vortex Shedding i
< Proprietary Information Removed >
l l l TR-ECCS-GEN-01-NP l Revision 2 62
1
)
6.5 Free Vibrations Comparison of the results for the small strainer tests alone, as a uniform smooth non-perforated test cylinder, and as a smooth impervious non-perforated stacked disk body indicate the change in free oscillation frequency which is indicative of the inertial mass of the test specimen. Of significance, the considerably higher frequency of the small strainer compared to the non-perforated cylinder and
. stacked-disk body indicates the distinctly lower effective inertial mass of the perforated strainer.
Given that the stiffness of the supported system is effectively the same for each l specimen, the ratio of frequencies is inversely proportional to the effective mass of q the system. j i
< Proprietary Information Removed >
i These results strongly support the lower hydrodynamic mass coefficient values for the perforated bodies when compared with traditional smooth impervious cylinders. l 6.6 Perforations and Hydrodynamic Mass Coefficients The hydrodynamic mass for the analyses of submerged structures in ECCS suppression pool applications is typically based on an inertial mass coefficient, C., TR-ECCS-GEN-01-NP Revision 2 63
l 1 of 2.0, defined such that the added mass coefficient is 1.0. With this definition, the j C, value for a flooded impervious body is always greater than one. For a perforated body the " contained" mass has no lower limit; the fluid may be able to ! flow in and out at will if the perforated body is sufficiently "open".
< Proprietary Information Removed >.
From another perspective, the hydrodynamic mass may be viewed as the manifestation of pressure differentials due to the flow field. The perforations effectively negate or " relieve" the pressure. The degree of " openness" required to l allow this pressure relief has not been determined here but is judged to be small. 6.7 Application of Test Results A number of factors, principally geometric, are likely to affect the hydrodynamic ) parameters derived from these tests. These geometric factors are shown in Table I 6.1 and include: 1
< Proprietary Information Removed >
l ) The hydrodynamic parameters derived from the test results of this investigation are l applicable to stacked disk strainers similar with respect to the above geometric parameters to those tested. TR-ECCS-GEN-01-NP Revision 2 64 l L _ _ _ _ - . _ _ _ _ _ _ _ _ _ _ _ _ _ __
TABLE 6.1 GEOMETRIC PARAMETERS OF TESTED STRAINERS Parameter Prototype No. Test-1 Prototype No. 2 Strainer Length to Diameter Ratio 1.00 1.20 Disk to Slot Thickness Ratio 1.66 0.90 Spool Length to Diameter Ratio 0.31 0.23 Strainer Hole to Surface Area 40 % 40 % Strainer Hole Diameter 1/8" 1/8" TR-ECCS-GEN-01-NP Revision 2 65
1.4 eig i i eiii l i iei:g i a ei 1.2 -. Extremely rough
- . . . . . . . . g[ cylinder 1.0 -
Cylinders with% - c, m od ,,t. s 0.8 - marine growth ._ Smmth p (, _ , _ , _ , _g% I 0.6 - - 0.4 'I ' ' ' I ' ' ' I ~ l 8 8 8 5 10s 5 10 4 5' 10 5 6 x 10 7 bynolds number FIGURE 6.1 RECOMMENDED DRAG COEFFICIENT VALUES (Reference 6.2) i l TR-ECCS-GEN-01-NP I Revision 2 66 1 i l l
1
< Proprietary Information Removed >
l l FIGURE 6.2 SMOOTH IMPERVIOUS STRAINER DRAG FORCE - TEST d472 i TR-ECCS-GEN-01-NP ; Revision 2 67 l
1 1 l k 7.0 - CONCLUSIONS P L A test program was conducted to investigate the behavior of large capacity stacked disk. l ECCS suction strainers subjected to accelerated separated fluid flow fields. Empirically L based values for the coefficients of constant velocity drag, C,, and hydrodynamic (inertial) L mass, C, were obtained by accelerating the test objects through still water and by~ submerged free vibration tests. The tests were performed using PCI Sure-Flow" stacked f ! disk strainer prototypes No. Test-1 and No. 2 {
- The significant conclusions drawn from the reduction of the data recorded during the tests..
are as follows:
*. The hydrodynamic coefficient of drag C , as expected, is higher than that for an impervious smooth cylindrical body of same major dimensions.
! ' < Proprietary Information Removed > a The resultant coefficient of inenial mass, C., is substantially lower than that for an impervious smooth cylindrical body of same major dimensions. l i l l
< Proprietary Information Removed >
l l l These conclusions are applicable in the lateral direction to stacked disk strainers which are similar to the PCI prototype designs tested. Section 6 of this report discusses in detail those parameters which significantly influence the conclusions and which must be evaluated
~
to determine their applicability for strainers of different geometric proportions. L l- TR-ECCS-GEN-01-NP Revision 2 68 i
l
8.0 REFERENCES
1.1 NRC Bulletin 96-03, " Potential Plugging of Eraergency Core Cooling Suction Strainers by Debris in Boiling-Water Reactors," May 6,1996 1.2 Morison, J.R., O'Brien, M.P., Johnson, J.W., and Schaaf, S. A., "The Force Exerted by Surface Waves on Piles," Petroleum Transactions, AIME, Vol.189, pp.149-154,1950 2.1 ~ Performance Contracting, Inc., Engineered Systems Division, Kansas, BWR Test Strainer, Drawing Numbers: ECCS-1, ECCS-2, Rev 0,02-10-93 l 2.2 Performance Contracting, Inc., Engineered Systems Division, Kansas, ECCS Suction Strainer, Drawing Number: ECCS-003, Rev 1,07-31-95 3.1- Duke Engineering & Services, Inc., Specification No.: TS-ECCS-QC-01, l " Hydrodynamic Mass Determination for PCI Sure Flow ECCS Suction Strainer", Report No. VQ16RD.F13, Rev.~ 0, November,1996 3.2 386-MATLAB fo 80386-based MS-DOS Personal Computer, October 15, 1990 5.1 John M. Biggs, " Introduction to Structural Dynamics," McGraw-Hill, Inc.1964 6.1 American Bureau of Shipping, " Rules for Building and Classing Mobile Offshore Drilling Units," 1980 Edition 6.2 Atkins Research and Development, CIRIA Underwater Engineering Group,
" Dynamics of Marine Structures - Methods of Calculating the Dynamic Response l' of Fixed Structures Subject to Wave and Current Action," Report UR8, June 1977.
l 1 l-l
- l. .TR-ECCS-GEN-01-NP
. Revision 2 69 l
l c _ _ -_ _ _ _ _ - - _ _
)
l 1 1 l IIYDRODYNAMIC INERTIAL MASS ! TESTING OF ECCS SUCTION STRAINERS l Al'PENDIX A i l l LIST OF TEST INSTRUMENTATION l l l l 1 ( '. 1 l-l l l l i ! TR-ECCS-GEN-01-NP Revision 2 A-1 I
LIST OF TEST INSTRUMENTATION
- 1. Load Cell Strain Gages Precision Strain Gages, Micro-Measurements Inc.
CEA Stacked Rosette Model, Type CEA-13-062WT-350
. 2. Load Indicators Bending Beam Load Cell, Transducers Inc.
Model T363-1K-20P1, S/N 06012 Weighing Indicator, A&D Co. Ltd, Tokyo Model AD-4316, Option List 01020304, S/N B 0800812
- 3. Accelerometer
- Q-Flex Servo Accelerometer, Sundstrand Data Control, Inc.
Model QA-700, P/N 979-0700-001, S/N 7948
- 4. Angle Measurer Angle Computer Co., Inc.
i S/N C274 i
- 5. Tachometer l^
l - OMB Towing Carriage Tachometer L PMI Model 12FS 089 l l , _ TR-ECCS-GEN-01-NP
. Revision 2 A-2
I liYDRODYNAMIC INERTIAL MASS TESTING OF ECCS SUCTION STRAINERS APPENDIX B CALIBRATION DATA TR-ECCS-GEN-01-NP Revision 2 11-]
B-1. lead Calibration All weights used for load Calibration and calibration checks were verified as being within the maintenance tolerances applicable to scales according the appropriate j California Code of Regulations. This tolerance is 0.1% of the test load. All test weights were certified traceable to NIST as documented herein. The Reference Load Indicator was directly checked against the certified weights. l l !^ l
)
1 i TR-ECCS-GEN-01-NP Revision 2 - B-2 o -- - - - - _ - _ - - - - _ - - - - - - - - _ - - - _ - - - - - - _ - - - _ _
i
< Section B-1 information is proprietary in its entirety >
Pages B3 - B12 TR-ECCS GEN-01-NP Revision 2 B-3
B-2. Calibration Data The plots in this Section represent the calibration data for the load cells used in the tests. All loads are referenced to the Reference Imad Indicator which was calibrated using weights traceable to' the NIST, as discussed in Section B-1. l l
.l
.t )
1 l L l i l .. l l
. . . . j
( ' TR ECCS-GEN-01-NP
=
Revision 2 B-13 l l. t.
< Section B-2 information is proprietary in its entirety > g i
l Pages B14 - B20 l l { TR-ECCS-GEN-01-NP Revision 2 - B-14 u_____._______ ___ j
l
.: r . .
l
- j. B-3. Velocity and Acceleration Calibration Data
- The OMB towing carriage tachometer was calibrated against the certified hand-held
- tachometer and also against direct distance and time measurements. (Time to travel 50 ft at preset terminal velocity measured with stop watch - variation less than
, 0.5 %)
y j-l- 1 i e l l' TR-ECCS-GEN-01-NP Revision 2- "B-21 ! f ., 3/ } .: (, . x L- - - . . j
I
< Section B-3 information is proprietary in its entirety >
TR-ECCS-GEN-01-NP Revision 2 B-22 _}}