ML20199J805

Rev 0 to Performance Contracting,Inc ECCS Sure-Flow Strainer Data Rept

ML20199J805
Person / Time
Site:	Brunswick
Issue date:	12/31/1996
From:	Diertl R, Kaufman A, Louderback R CONTINUUM DYNAMICS, INC.
To:
Shared Package
ML20198Q855	List: BSEP-97-0411, Forwards Suppl Response to NRC Bulletin 96-003, Potential Plugging of ECC Suction Strainers by Debris in Bwrs.Rept Summarizes Actions Taken for NRC Bulletin 96-003 ML20198Q879 ML20199J805 ML20202E044
References
W04536-01, W04536-01-R00, W4536-1, W4536-1-R, NUDOCS 9711280236
Download: ML20199J805 (39)

Text

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C.D.I. Tedmical Noto No. 96 22

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Performance Contracting, Inc.

ECCS Sure-Flow Strainer Data Report Revision 0 , .

WO453 6-01 December 1996 Prepared by Continuum Dynamics, Inc.

P.O. Box 3073 Princeton, New Jersey 08543 Project Vianager L

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Andrew E. Kaufit3;an Authors Andrew E. Kaufman Robert W. Diertl Richard G. Louderback Prepared for Electric Power Research Institute 3412 Hillview Avenue Palo Alto, California 94304 EPRI Project Manager Leonard Loflin 4 Plant Support Engineering C U ntoTb D W

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l OF W ARRANTIE S AND . LIMIT ATION OF -

D IS CL AIME R LI ABILITIES THSREPCRTWA6 PEPAND Er(TKOR3#4ENDMS NWD BS.IW AS AN ACOOJNTOFWCRKSOSCRO OR CCEO6CRED BYTE ELECTRO PONER RESEAFCH INSTITUTE,lPC. (EPRk NETHER ErPt AN( M 9AEER OF E.:El ANf COSR3r6CR.TK ORGAN 7.ATONS BELON,NCR AN( PEREN ACTNG ON EEHMIOF AN(OFTEM (A) MAKES ANfW ARFWW(OR REPEEENTRONWMTS E DPREE OR IWUED,(5 WITH REWOTTO TE USE OF A#firfCRMABCN. APPARATUS,METFOO,PRDCESS, OR SMLAR ITEM DSO.CSED IN THS RESCRT,itCLUOM3 MERCHMTABUTY Ato FITESS FCR APARTICULAR PURFCE,OR (I) THAT SLE H UE OGS NOT IffRrCE ON OR INTEREEWfrH PRA1ELYCW40 RGHTSitCLUDNG AN(PARTYS INTEJECTUAL PRDERTY, OR (14 THAT THS R EPCRT IS StJTAR.ETO AN( P ARTK11 TAR U ER SC RCUMSTNC Et OR JG AN(

(4 AS5tME READPEBLJTY FCR AN( DMAAES OR OTHER UASUTY WHATSTER (NCUD:

CCNECJ EN1MLDM AGE. EwN IF EMilOR AN(E?Rl R EPEEENTEVEH AS BEEN AD4150 OF TE PCSSBUTY OF StCH DM AGE) RELA. TING FR]M YOJ R SB.fCTKN OR U EOFTHS RE=CRT OR ANYINFCRMA11CN AFDARATUS, M ETH30,PRDCESS,OR SMI.AR ITEM D SC.CEQ iN THS R EPCRT.

OR3ANL. ATOMS THAT PE? APED THS RESCRT Cmdruun Dynarria,lnc, r

ORD ERIN G INFORMATION Fe:uesta fer :::ies cf this recor: should te directed to the EPRI Dis::.cutten Center, 207 Coggins Orrve, P.O. E:x 23205, Pleasan: Hill, CA 94E23, (510) 934-4212. There is no enarge foi recerts re:ues:et by EPRI mem er utdities.

Ewrc ?:wer Fesm:n tr.s: .:'e a-d E?R1 are reps ered sewe ma ks of E:ecrc P:wer Fesearch Ins:t:3.1.c.

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• lir55 Etc; Pcwer Researen instt.;te. Inc. A3 r'gnts reserved.

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i ABSTRACT .  :

- A Performance Contracting, Inc. (PCI) Sure-Flow w trainer s was tested under a variety of debris and flow conditions in _the Boiling Water Reactor Owners' Group (BWROC test facility at the EPRI facility in Charlotte, North Carolina. The strainer was tested with fibrous insulation, simulated corrosion products, and reflective metal insulation (RMI). This report documents the head loss results from th'e five tests conducted in October 1996.

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CONTENTS ,

1 i N T R O D U C Tl O N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 T E S T F A C l LI T Y . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 I n s tru rn e n tatio n ....... ..... .. ................... . .... ........... ................ ............ ... ........................ ..... 2 - 1 Strainer......................................................................................................................2-2 D e b ri s M a t e rial s . .. .. .. .. . . . . ... .. .... .. . .. . .. . . . ... .. . .... .. . ... .. . ... .. . .. .. . . .... ... . ... .. . . . . .. . .. . .. . .. . .. . ... .. ... ......

S um mary o f Te s t P ro c e d u re s ...................................................................... .................... 2 3 3TESTMATRIX.....................................................................................3-1 4TESTDATA........................................................................................4-1 RunPC11..........................................._............................................................................4-1 4

RunPCl2............................................................................................................................4-2 RunPCl3.....................................................................................................................4-2 RunPCl4...............................................................................................................................4-2 Runt"-Cl5............................................................................................................................4M 5 O U A L I T Y_ A S S U R A N C E . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 1 6 REFERENCES....................................................................................6-1 A

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LIST OF TABLES .

Table 2-1 Ins trum ent Lis t . .... . .... .. .......... .... ............... . .............. ........... ...... 2-2 Table 3-1 PCI Sure-Flow S trainer Tes t Ma trix ............... .......... ............................... 3 1 Table 4-1 Ste ady State Test Da ta ..... ................... .......... .................................. ............. 4-2 9

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LISTTO F FIGURES 1

Figure 2-1. Schema tic of tes t facility. ............................... ............. ................ . ...... . 2-5 Figure 2-2 Schematic of instrument locations.. .................. . ......'.................. 2-6 ....  :

Figure 2-3 Photograph of Sure-Flowm S tra in er. ...... ........... .............. ...... . ......... ...... ... 2-7 ,

Figure 2-4 Sketch of Sure-Flowm S tr ain e r. .. . . . ... . . .. .. . .. ... . .. . .. .... . . . . . . .. . ... . . . . ... ... .

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1 INTRODUCTION In the event of a Loss of Coolant Accident (LOCA) in a Boiling Water Reactor (BWR) nuclear power plant, insulation installed on piping can reach the wetwell which supplies water to the Emergency Core Cooling System (ECCS). This insulation combined with corrosion products and other debris can migrate and block strainers installed on suction lines supplying the ECCS pumps Relatively small amounts of glass fiber insulation combined with corrosion products have been shown to result in significant pressure drop across a strainer screen. .%

altemate suction strainer design, the Sure-Flow m strainer, was provided by PCI to evaluate its performance under different flow and debris loads. From 28 through 30 October 1996, Continuum Dynamics,Inc. conducted a series of tests on this strainer.

Tests were conducted at the Electric Power Research Institute Non Destructive Evaluation Center in Charlotte, North Carolina.

Testing was conducted following the Plan for Testing PCI Strainer, Revision 1,2S October 1996 (Ref.1). Test procedures and materials essentially duplicated BWROG procedures and materials for strainer testing.

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Test Facility

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TEST FACILITY A schematic of the test facility is shown in Figure 2-1. The strainer was mounted horizontally to a 24 inch tee in a nominally 50,000 gallon vessel. Typically, the vessel was filled with 40,000 gallons of water. Two centrifugal pumps capable of producing 10,000 GPM were used to provide system flow controlled by valves on the pump outlets, ne flow returned to the vessel through a venturi and then through a pipe whose exit was centered in the vessel and directed down toward the floor.

This pipe orientation prevented material from settling on the vessel floor.

The piping configuration also allowed the strainer to be backflushed. Backflush flowrates up to 5000 GPM can be obtained, but backflush duration is often limited because debris from the vessel can be pulled inside the strainer because of the location.of the backflush inlet pipe (see Figure 2-1).

Instrumentation A schematic (illustrating the instnrnent locations is shown in Figure 2-2 ne head loss across the strainer and debris bed is measured by a Rosemount 1151 smart differential pressure transmitter that is connected to the blind flange of the strainer tee. The flow rate is measured by the venturi in the return leg of the piping and another a Rosemount 1151 smart differential pressure transmitter. The outputs of these transmitters were connected through Sensotec GMA displays and amplifiers (0.2% accuracy) to a computer controlled DATAQ DI-22012 bit data acquisition systew.. Fiber, simulated corrosion products and RMI were weighed on an Ohaus mode! DS10L scale and water temperature was measured with a thermometer.

Table 2-1 lists the instruments used in the test program.

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2-1

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Test Facility i

Table 2-1 -

l Instrument List I

Instrument Range Accuracy Comment Symbol DP1 Differential 0-650 inches +/- 1 inch of Strainer head Pressure of water water loss.

Transmitter _

DP3 Differential 0-250 inches +/- 0.4 inches Used with of water of water venturi Pressure Transmitter (+/- 300 GP'M accuracy).

Data 0-S volts +/ .025% Record A/D Acquisition pressure and flow data.

Thermometer 35-120 +/- 3 degrees Water T1 degrees F F temperature Commercial grade.

Balance 0-100 pounds +/- 0.5 Weigh debris B1 pounds commercial grade.

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Strainer A photograph of the PCI Sure-Flow" strainer is shown in Figure 2-3. A sketch of the strainer showing some important dimensions is shown in Figure 2-4.

Debris Materials NU'<ON* Base WoolInsulation was used as the fibrous insulation for this test program. Tne insulation was supplied, prepared and weighed by PCI and supplied in 25 pound bags. Samples of the insulation were collected to provide an estimate of the size distribution. An analysis of the shredded fibers showed a similar size distribution as was used in the BWROG tests.

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Test Facility Black Iron Oxides obtained from Hansen Engineering, Inc. were used to simulate corrosion products with a distribution of 95% Grade 2008 and 5% Grade 9101-N-40 by weight .

Reflective Metal Insulation (RMI) was also used during testing. Stainless steel foils with a thickness of 2.5 milswere supplied by Darchem Enginetring, Ltd. The foils were cut into nominally 3/8,3/4,1.5,3, and 6 inch squares and then crumpled to simulate RMI debris. The material was purchased and processed by EPRI. Based on EPRI documentation, the two smallest size categories were crumpled by the garden / leaf shredder and the remaining sizes were crumpled by hand. The resulting RMI debris was similar to the RMI used in the BWROG tests.

Summary of Test Procedures The test procedures duplicated the test procedures used in the BWROG strainer tests. The procedures are summarized below.

The main test procedure defines the steps necessary to perform one complete test for measuring strainer head loss. The main steps in this procedure include system start up, material addition, data acquisition, flow rate control, backflushing and test termination. Data acquisition is started before the pumps are tumed on and materialis added to the vessel after the flow rate has been established. The time of material introduction is recorded. The amount of material added is determined by the test matrix. Simulated corrosion products are always added first and allowed to mix in the vessel before the other debris is added. Simulated corrosion products are added dry, whilefshredded fiber is soaked first to ensure it will sink. ,

During a test the flow rate is maintained at a nearly constant value determined by the test matrix _ unless the strainer maximum pressure drop is reached or the maximum pump flow is achieved. After the strainer head loss has reached approximately steady state, the now rate can be adjusted down and up (a flow sweep) to obtain head loss at different flow rates, and if required, the strainer can be backflushed. The strainer is backflushed by shutting off the pumps and reconfigurmg the valv<.:s so that pump #2 can pull water from the backflush line into the strainer. Panp #2 is tumed on and then the backflush valve is opened until the backflush puge reads the pressure corresponding to the desired flowrate.

The flow is then maintained at this flowrate for the desired time. A run is te-minated when the strainer head loss reaches approximately steady state or a de: ermined value of head loss has been achieved (after conducting any require.d flow sweeps or backflush). After test termination, a backup copy of the digitally recorded data is made and the ending water temperature is taken.

Daily procedures are followed to check the differential pressure transducers and data acquisition system. Differential pressure cell: eros and known water height I readings are taken and compared to the transducer output. The output of the data l 1

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Test Fasility 1

I l acquisition system is also checked to insure it is operating correctly and that the instruments t.re correctly connected. Periodic confidence checks on the scales and thermometer are also conducted as required. .

Also associated with each main test procedure is a material preparation procedure which defines how much materialis to be added to the vessel. 'Ihis procedure defines the methods to identify and quantify the fibrous insulation, simulated corrosion products and other debris to be used for each test. Sampids of fibrous insulation prepared by PCI were taken to characterize its size distribution.

RMI was provided by EPRI in boxes marked with the square feet of area and was not weighed. All material used in the program is identified by a unique number.

Data is stored on disk as voltages from the differential pressure transducers.

Using the calibration curves for each instmment, the voltages are converted to engineering units (either inches of water or gallons per minute). The clean head loss as a function of flow rate is subtracted from etch head loss data point to obtain the head loss across the debris bed. The data ir, plotte? in Appendix A as a function of time and approximate steady state values are tabulated in Section 4.

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ISOLATION VESSEL PENETRATION VALVES EL. APPROX. 8' Figure 2-1 Schematic of test facility.

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VALVES DISCHARGE Figure 2-2 Schematic of instrument locations.

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3 TEST MATRIX -

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The test matrix is shown below. It was modified from the preliminary matrix shown in the test plan based on FCI requirements.

Table 3-1 PCI Sure-Flowm Strainer Test Matrix Run Mass Fiber Mass C.P. RMI Comments (Ibm) (Ibm) (feet')

1 1 0 0 0 Clean head loss over full flow range.

2 25 100 800 RMI test with fiber, debris bed made at

'5000 GPM.

3 100, 150, 0 0 Incemental Material Addition, debris bed was l

l 200, 250, made at 4000 GPM for last addition.

l 300 l 4 100 100 0 , Debris bed made at 5000 GPM 3 200 100 0 $

Boston Cd' 8.# =16 test, debris bed made at 4400 GPM and reduced to 4000 GPM.

l Tne flow sweep at the end of each run was modified to provide additional data '

points for most runs as shown in Section 4 and in Appendix A.

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3-1

TEST DATA

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' Table 4-1 summarizes the data collected from the test program. The table contains specific information about each test including nm number, nm date, flow rates tested, mass of insulation and corrosion products used (if applicable), amount of RMI, the average water temperature and the steady state differential pressure across the strainer (head loss) for that condition. All of the tabulated head loss

• values represent the head loss across the fiber / debris bed. Tne head loss of the clean strainer has been subtracted (except for the baseline, clean strainer case.)

Plots for each of the runs are included in Appendix A. 'Ihe plots show the strainer differential pressure and the corresponding flow rate as a function of time.

Material addition times and other run specific notes are indicated on the plots. The strainer differential pressure represents the head loss across the debris bed only,

" clean" head loss has been subtracted out.

The data contained in the tables and the plots in the Appendix have been verified according'to C.D.I. Quality Assurance procedures. Notes for each run are provided below.

Run PCl1 Tne first ran was conducted from 1250 GPM to 10,000 GPM with no debris in the tank. From these data the clean head loss as a function of flow rate is determined so that the clean strainer head loss can be subtracted at any flow rate.

Tnis clean head loss run was conducted with a lower wate: level than usual to check if air would be sucked in from the free surface. The centerline of the strainer was 95.5 inches above the tank floor, and the water level was measured at ..

• 65.S inches by the DP1 transducer, which was mounted approximately 8 inches above the tank floor. With approximately SS inches of water above the top of the strainer, no vortexing (or air being sucked into the strainer from the free surface) was visually apparent over the range of tested flowrates.

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Test Dus Run PCl2 ,

This test was run with 25 pounds of fiber,100 pounds of corrosion product and 800 square feet of RMI. The RMI was evenly divided into 3/8,3/4,1.5,3 and 6 inch square pieces that were crumpled. After the corrosion products were added and allowed to circulate the fiber and RMI were added together.

Run PCl3 This test was conducted with fiber alone. The initial increment was 100 pounds, subsequent increments were 50 pounds. Fiber was added after approximately steady state head loss was reached for each increment. The head loss increased essentially linearly for each 50 pound increment, see Table 4-1 and Appendix A.

Run PCl4 This test was conducted with 100 pounds of fiber and 100 pounds of corrosion products.

Run PCl5 This run was conducted with 200 pounds of fiber and 10C pounds of corrosion products. Initially, the flow rate was set at 4400 GPM to form the debris bed. The flow rate was reduced to 4000 GPM to maintain the head loss below the maximum allowed for the strainer.

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Table 4-1 Steady State Test Data Run Date Flow insulationCorrosion RMI Recipe Head Avg. Comments 2  % Loss H2O Rate (Ibs) Products (ft )

(GPM) (lbs) (in. Temp H2O) ('F)

PQ1 lons 5000 - - - -

0[6] 69 Baseline clean '

strainer.

( ]- Denotes head loss across clean straincc.

PG1 ions 1250 - - - -

0 (0.2] 69 4-2

Test Data Table 4-1 ,

Steady State Test Data Run Date Flow insulationCorrosion RMI Recipe Head Avg. Comments Rate (Ibs) Products (ft )2  % Loss HO 2 (GPM) , (Ibs) (in. Temp H2O) (*F)

P G 1 10/2s 2500 - - - -

0[1] 69 FC1 10/2s 3750 - - - -

0[3] 69' PCI 10/2s 6250 - - - -

0[10] 69 PCI 10/2s 7500 - - - -

0[15] 69 PQ1 10/2s 8750 - - - -

0[20] 69 PCI 10/2s 10000 - - - -

0[24] 69 PQ2 10/2s 5000 25 100 800 - 28 70 PC2 10/2s 2500 25 100 800 -

11 70 PG2 10/2s 3750 25 100 800 -

19 70 PG2 10/2s 6250 25 100 800 -

33 70

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PQ2 10/:s 7500 25 100 800 -

35 70 PG2 10/2s 8750 25 100 800 -

42 70 PG2 10/23 10000 25 100 800 -

52 70 PG2 10/23 5000 25 100 S00 -

23 70 6p increasing slowly. -

PQ2 10/2s 5000 25 100 800 -

29 70 Approximate steady state value ,

after shutting off pump for one minute and ,

restarting.

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Test Data Table 4-1 .

Steady State Test Data Flow InsulationCorrosion RMI Recipe Head Avg. Comments Run Date 2  % Loss H2O Rate (Ibs) Products (ft )

(in. Temp (GPM) (Ibs)

H2O) ('F) .

100 . - - 73 71 P C 3 10/29 5000 150 . - - 121 71 P C 3 10/29 5000 150 - -

56 71 PC3 10/29 2500 -

150 - -

91 71 PC3 10/29 3750 -

150 - -

119 71 PC3 10/29 5000 -

200 - 166 71 PC3 10/29 5000 - -

200 - 74 71 PC3 10/29 2500 - -

200 -

127 71 PC3 10/29 3750 - -

PC3 10/29 5000 200 - - -

166 71 250 -

214 71 PG3 10/29 5000 - -

PC3 10/29 2 00 250 - - - 100 71 250 164 71 FG3 10/29 3750 - - -

300 194 71 FC I3 10/29 3750 - - -

300 200 71 PC3 10/29 4000 - - -

PG3 10/;9 2500 300 - - - 116 71 300 - -

211 71 PG3 10/29 4100 -

147 7t; PG4 10/29 5000 100 100 - -

100 65 70 PG4 10/29 2500 100 -

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Test Data-Table 4-1.

- Steady State Test Data .

- Run Date Flow. InsulationCorrosion RMI Recipe- Head Avg.- Comments-H2O

. Rate (Ibs) Products (ft )'2 -- %- Loss (GPM) _ (Ibs) (in. Temp

.H2O) (.F) r-104 70 PO4 > 10/s 3750 100 100 - -

PG4 lo/s. 6200 100 100 - - 177- 7d PG4 to/s 6900 100 100 - -

206 70-

-PO4 10/s 5000 100 100 - - 144 70 PQ5 10/30 4000 200 100 - -

232 71 Removable perforated end plate covered with solid plate for run PQ5.

PQ5 10/30 2500 200 100 - - 129 71 200 100 157 71 PG5 10/30 y00 - -

-PQ5 10/30 3500 200 100 - - 200 71 PG5 10/30 4000 200 100 - - 231 71 9

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5 QUALITY ASSURANCE .

All quality related -test activities were performed in accordance with the Continuum Dynamics, Inc. Quality Assurance Manual, Revision 12 (Rei. 2). . Qua related activities are those which are directly related to the planning, exe ution and objectives of the tests. Supporting ii activ h t es t t suc as es apparatus design, /abric C.D.I.'s and assembly are not controlled by the C.D.L Quality Assurance Manual.

for compliance with the reporting Quality Assurance Program provides requirements of 10 CFR Part 21. All instrument certification and calibration, test procedures, data reduction procedures and test results will be contained in a D Record File which (upon completion) will be kept on file at C.D.I. offices.

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6 REFERENCES

1. Continuum Dynamics, Inc., Plan for Testing PCI SureFlow Strainer, Revision 1, 28 October 1996.

2. Continuum Dyna nics, Inc., Quality Assurance Manual, Revision 12, October 1996.

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DATA PLOTS Plots of head loss across the debris bed and flow rate are shown for each test.

all runs, except PG1, the clean head loss is subtracted from the total measured head loss to provid e the head loss across the debris bed. Head loss is measured in inches of water and flow rate is measured in gallons per minute (GPM).

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3ata Mots .

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Run PCl1: PCI Sbre Flow Strainer No Materials Used in Test ,

Clean Strainer

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0 ': l 0 5 10 15 20 Time (minutes) 12000 ;-

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9 0 6 10 15 20 Time (minutes) ,

Figure A 1 Head loss and flow rate versus time for run PCII.

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e Data Mots >

Run PCl2: PCI Sure-Flow Strainer [

25 lbs Nukon insulation 100 lbs Corrosion Products 800 tt' RMI j 60 -

100 lbs corrosion products added j 3- 50 .

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• e 800 ft8 RMI  :

$Ce 30 _ added 35 .

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i t A-l

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Run PCl4: PCI Sure-Flow . Strainer {

100 lbs Nukon insulation  ;

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Fip.tre A-4 Head loss and flow rate versus time for run PCI4.

A-5

Dets Plots .

Run'PC15: PCI Sure-Flow Strainer i 200 lbs Nukon insulation .

100 lbs Corrosion' Products Perforated End Plate Covered with Solid Plate e

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A-6

Brunswkn Unk 2 ECCS Sueden Streiner anpinconwne Pro)*ct AppentirC i NRC Bulletin 96-03 FinalReport l

i Appendix C BSEP Unit No. 2 Replacement Suction Strainers Design Drawings Drawings:

1. Strainer Imation Drawing, Torus Plan View

2. Equipment Assembly Drawing, Suppression Pool Strainer 2. Ell SI, RHR Pumps 2A & 2C

3. Equipment Assembly Drawing, Suppression Pool Strainer 2. Ell S2, RHR Pumps 2B & 2D

4. Equipment Assembly Drawing, Suppression Pool Strainer 2.E21.S2 A, Core Spray Pump '

Suction Line A .

5. Equipment Assembly Drawing, Suppression Pool Strainer 2 021.S2H, Core Spray Pump Suction Line H a

ECCS SUC ::ON S~ RA::,\ E R 3 ROJ EC~

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Brunselik Unk 2 ECCS Section Sneheer Capteconwnt Pre}ert appendkD NRCBulletin WO3 FinalReport t

t l

Appendix D BSEP Unit No. 2 Torus Design Drawing Drawing:

1. Torus Drawing, Section at Arm.315'(looking Southeast) 2 Torus Drawing. Typical Section Near Vent 11 ender Support and Center SRV Quencher Support I

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Bronse4ca Unk 2 sECCSSuction SoreJner Replaceneent Project Appennik E NRC Runeren H M FkelReport Appendix E Strainer Hydrodynamic Mass Test Reports Reports:

1. Test Report No. TR.ECCS GEN-01,"Il 3drodynamic Inertial blass Testing of ECCS Section Strainers," Revision 2, September 1997.

2. Test Report No. TR ECCS-GEN-05," Hydrodynamic Inertial Mass Testing of ECCS Suction Strainen Supplement 1 - Free Vibration Analysis," Revision 1. September 1997.

D 'W -=.m== - , . _,

TR ECCS GEN-01.NP Revision 2 September 1997 HYDRODYNAMIC INERTIAL MASS TESTING OF ECCS SUCTION STRAINERS Test Report No. TR-ECCS-GEN-01 NP t

i h.<, h g pg, Duke Engineering & Services, Inc.,215 Shuman Blvd Naperville Illinois 60563 Ph. (630) 778-0100

i DUKE ENGINEERINO & SERVICES, INC.

I COMPANY DISCLAIMER STATEMENT Please Read Carefully The purpose of this report is .; document the resul's of a hydrodynamic test program conducted i

by Duke Engineering & Services (DE&S) to investigate the behavior oflarge capacity stacked disk Emergency Core Cooling System (ECCS) strainers subjected to acceterated separated fluid flow fields. DEAS makes no warranty or i.p. entation (expressed or implied) with the respect to this document, and assumas no liability as to the completeness, accuracy, or usefulness of the information contained herein, or that its une may not infringe privately owned rights; nor does DEAS 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.

I i

t

\

TR ECCS-GEh'41 NP Revision 2 il

EXECUTIVE

SUMMARY

%Is 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. De 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 submerged free vibration tests.

De experimental investigation was designed and managed for DE&S by Dr. David Williams of Digital Structures, Inc. (DSI) and performed at de Offshore Model Basin (OMB) in Escondido, Califomia. He 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. De 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 >

• The resultant coefficient of inertial mass, C., is substantially lower tnan that for an impervious smooth cylindrical body of same major dimensions. <

Proprietary Information Removed >

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 determine their applicability.

TR ECCS GEN.01 NP Revision 2 iii

h l

i TABLE OF CONTENTS  !

Page i

LIST OF TABLES ..............................................vi l LIST OF FIGURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vil INDEX OF NOTATIONS AND VARIABLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . Vill

1.0 INTRODUCTION

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I 1

1.1 3ackground ..........................................

1.2 A pproach . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I 1.3 Obj ec tive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 i

1.4 Itaport Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 i

2.0 SCOPS OF TEST PROGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2.1 General Description of Experiments . . . . . . . . . . . . . . . . . . . . . . . . . . 2 '

2.2 Test Specimens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 11

3.0 DESCRIPTION

OF TEST EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . .

11 3.1 Test Facility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

11 3.2 Tes: Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

.................................. 12 3.3 Test Instrvmentation Data Acquisition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3.4 ,

TEST PROCED URE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 4.0 Test Matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 4.1  !

4.2 Sequence of Testing Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Measurement of Strainer Weight nd Dimensional Properties . . . . . . . . . 30 4.3 4.4 Transducer /Instrum:.ntation Calibration . . . . ..................30 4.5 Test Data Collection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 4.6 Test Data Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 '

4.7 Test M onitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , 32 r

42 5.0 RES ULTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.1 Approach to Results Interpretation . . . . . . . . . . . . . . . . . . . . . . . . . . 42 5.2 Constant Velocity Towing (Drag Forces) . . . . . . . . . . . . . . . . . . . . . . 43 5.3 Accelerated Towing (Hydrodynamic Mass) . . . . . . . . . . . . . . . . . . . . . 44

.i.4 Free Vibrations .....................................45 TR-ECCS-GEN 01-i,P Revision 2 iv

6.0 DISCUSSION OF RESULTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

u.1 Approach to Results interpretation . . . . . . . . . . . . . . . . . . . . . . . . . . . C 6.2 Coefficients of Drag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 6.3 Coefficients of Hydrodynamic Mass . . . . . . . . . . . . . . . . . . . . . . . . . 6!

6.4 Vortex Shedding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 63 6.5 Free Vibrations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

63 6.6 Perforations and Hydrodynamic Mass Coefficients . . . . . . . . . . . . . . . .

6.7 Application of Test Result ...............................64 68 7.0 CONCLUS IONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

69

8.0 REFERENCES

APPENDIX A LIST OF TEST INSTRUMENTATION ..........................A1 APPENDIX B CALIBRATION DATA ....... . .... .... .. .. .... .. .. .... . .... B-1 B-1. Load Calibration .....................................B2 B-2. Calibration Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B- 13 B 3. Velocity and Acceleration Calibration Data . . . . . . . . . . . . . . . . . . . . B-21 TR-ECCS GEN-01-NP y

Revision 2

l LIST OF TABLES Page 33 4.1 Matrix for 100 Series Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Matrix for 200 Series Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 4.2 35 4.3 Matrix for 300 Series Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

j 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 .....................................

3 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 Diitial Impulse Towing Test Results, Reference Body Inertia Forces ... . . . . . 50 5.4 51 5.5 Free Vibration Test Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

65 6.1 Geometric Pararneters of Tested Strainers . . . . . . . . . . . . . . . . . . . . . . . . . .

TR ECCS-GEN-01 NP l Resision 2 si

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 Suu-Flow" Strainer, Prototype No. Test-1 . . . . . . . . . . . . . . . . 7 2.4 Outline of PCI Sure-Flow" Strainer, Prototype No.2 . . . . . . . . . . . . . . . . . . . . 8 1

, 2.5 Photo of Reference Smooth Test Cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.6 Photo of Reference Smooth Impervious Stacked Disk Strainer . . . . . . . . . . . . . 10 3.1 Overview and byout of the OMB Towing Basin .....................14 l 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) ..........................!7 3.4 Photo of OMB Lead-Cells to Subframe Arrangement ...................I8

- 3.5 byout of OMB load-Cell Measuring System on Subframe . . . . . . . . . . . . . . . 19 3.6 Photo of DSI/OMB Subframe with Strainer Adapter . . . . . . . . . . . . . . . . . . . 20 3.7 byout 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 Deflectw . . . . . . . . . . . . . 23 3.10 DSI/OMB Test Specimen Ibundary/ Flow Deflector with Strainer Adapter . . . . . 24

?.11 byout of Test Instrumentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 3.12 Block Diagram of Data Acquisition System . . . . . . . . . . . . . . . . . . . . . . . . . 26 4.1 Example of Target Travel Definition .............................40 4.2 byout of Load Calibration System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 5.1 Velocity History - Test d105a . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 5.2 Prototype No. Test 1 Drag Force History - Test d104 . . . . . . . . . . . . . . . . . . . 53 5.3 Prototype No. Test 1 Velocity History - Test d104 ....................54 5.4 Support Drag Force History - Test d203 . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 5.5 Prototype No. Test-1 Derived Overturning Moment History Test d187 . . . . . . 56 5.6 Prototype No. Test-1 Effective Lever Arm - Test d187 .................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 Valuer ...........................66 6.2 Smooth Impervious Strainer Drag Force - Test d472 ...................67 s

i, TR-ECCS GEN-01-NP Revision 2 vii

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i INDEX OF NOTATIONS AND VARIABLES A projected area normal to flow (ft')

C absolute damping ObWin)

C., critical damping ObWin)

C, hydrodynamic standard (velocity) drag coefficient C.. hydrodynamic acceleration (inertial mass) drag coefficient 8 logarithmic decrement dU/dt acceleration (ft/s')

- P, hydrodynamic standard drag (velocity) force component Obs)

P. total hydrodynamic force Obs)

P, impulse force Obs)

P. 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')

W strainer air weight Obs)

We inenial mass weight Obs)

W, weight of support assembly from the adapter up to and including horizontal load cells Obs) w undamped natural frequency (Hz) w, damped natural frequency (Hz)

X peak amplitude of response l

l TR ECCS-GEN-01-NP Revision 2 viii

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l

1.0 INTRODUCTION

1.1 Background

ne installation and usa oilarge-capacity passive suction strainers is a planned modification to aHow BWR gm. to comply with the new USNRC i requirements for Emerge-cy Core Cooling System (ECCS) (Reference 1.1), ne subsequent analysis for qualification of the new install .tlon requires calculation - l

. i of hydrodynamic loading typical for submerged structures in a BWR suppression r

i pool.

ne hydrodynamic mass for the structura analyses is currently brsed on an [

inertial mass coefficient, C., of 2.0 (added mass coefficient of 1.0). No empirical data has been used to develop or substantiate this value, consequently j 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 this is a conservative value. Litercure surveys have not revealed any i 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 pmgmatic approach to substantiating a C value for use in strutusal qualification analyses was by undertaking a relatively simple hydrodynamically-based experimental derivation of C, for one ,

or more prototypical stacked disk bolt-on strainers.

i ne subject test program was undenaken by Duke Engineering & Services, Inc.

(DE&S). De experimentalinvestigation was designed and managed by Digital Structures, Inc. (DSI) and performed at the Offshore Model Basin (OMB).

1.2 Approach n? subject test program was designed ta obtain a C. value by application of basic fluid mechanics related to the forces on a cylinder due to fluid flow, ne empirically-based Morison equation for separated flow around cylinders has provided a useful and somewhat heuristic approximation (Reference 1.2). He -

forces consist of a drag component and an inertial component, ne drag component is propontional 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 Resision 2 1

t f

e h By measurement of the total forces to accelerate a body through fluid and a separate measurement of the drag forces and body acceleration, the i hydrodynamic inertial fcas can be derived and thus an effective mass coefficient C can be determined.

1.3 Objective 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 tc, 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 hydrodynarnic formulations. Hence, flow oriented along the strainer axis was not addresed in this te:t program.

1.4 Report layout ,

The scope of investigation including a description of test specimens is summarized in Section 2. The facility and test equipment are described in 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. Findirigs and L conclusions from the tests are summsrized in Section 7. References are provided in Section 8 and Appendices A and B contain test instrumentation descriptions and celibration data, respectively. .

L 2.0 SCOPE OF TEST PROGRAM i 2.1 General Description of Experiments L

The test program consisted of hydrodynamic experiments on two typical ECCS bolt-on stacked cisk strainers. The test strainer was towed through nominally still water, with the strainet axis oriented normal to the travel direction. Various kinematic conditions were investigated. A reference cylinder and a reference 1 TR ECCS GEN-01-NP Revision 2 2 l

1

i 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,.

Hereafter, testing l under accelerated motions (simulating accelerated flow effects) was performed.

Free vibration tests (quick release " pluck" tests) of all the specimens in the ,

i submergod condition were also undertaken, i

Subsequently, the hydrodynamic ineetW sTects on the test strainer were derived, from which an effective nominal coefs at of hydrodynamic mass, C., was calculated.

2.2 Test Specimens De two strainer test specimens for this program consisted of the Performance Contracting, Inc., BWR stacked disk test strainers (PCI Surt Flow Strainer, ,

Prototype No. Test-1 and Prototype No. 2), he former is a relatively small 6-disk strainer (55 ft') for nominal 10 inch pipe, whereas the latter is a large 13-disk strainer (170 ft') for 24 inch pipe, detailed respectively in the PCI shop drawings, References 2.1 :::id ?.2, and shown in Figures 2.1 and 2.2. He disks were made from i1 gauge perforated plate with 1/8 inch diameter holes and 40 percent epen 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 I spool length was 5 1/2 inches, not 6 inches, giving an overall length' of 53-1/2 inches, ne projectrd net lateral fmntal area of the small and large strainer was 2

respectively 5.28 and 12.0 ft' (gross areas of 6.48 and 14.33 ft ).

( De test stra ncrs were also weighed at the test site. The air weights were 305 and 948 lbs respectively for the small and large stralner (including the internal l

suction flow control device). Enclosed volumes were 9.04 and 26.27 ft' (12.40 and 36.35 ft' gross). The associated water displa:ements were 564 and 1638 lb l

I (777 and 2267 lb gross).

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 inctal 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

- - - . - . . . - -_ - . - - - . --. .- x - . _ _ _ _ -- ~~

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 y

lateral ares, 6.875 ft', of the Reference Test Cylinder wrc slightly larger than

(' that for the gross enveloped projected area of the Small M 'I Stramer No. Test-1 H[ L: (6.48 ft') .

The pur>~se of the Reference Cylinder Test was to provide a basis for comparisons with the perforated strainer and candad cylindrical shapes, with end effects.

- A Reference Smooth Impervious Stacked Disk Assembly was createa 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. 'Ihe air weight was 308 lb and the total surface area, including spool was 66 ft' The projected net lateral area was 5.28 ft' (gross " envelope" area of 6.48 ft' to outside profile).

}

The purpose of this test specimen was to provide a direct comparison with the perforated stacked disk strainer.

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3.0 DESCRIPTION

OF TEST EQUIPMENT-  ;

3.1 Test Facility he tests were performed in accordance with the test specification (Reference 3.1) at Offshore Model Basin's (OMB) Towing /MWag 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 fmm 0.05 ft/see to 18 ft/see with computerized speed control and was used to tow the submerged test i specimen through the basin.

1 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 ball joints 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, L

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 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 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 t adapter, not the boundary /subframe assembly. The R!FD wdghed 269.1 lbs.

L TR-ECCS-GEN-01-NP Revision 2 11

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. De other three, FZ1, 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, mounted on the adapter above the test specimen flange, was provided to measure test kinematics and verify local test specimen motion and 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. Sigral 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 10 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 l

transducer voltage data directly to disk via an internal timer when operating in the DMA mode.

l l TR-ECCS-GEN-01-NP Revision 2 12

The PC applications package 38&MATLAB (Reference 3.2) was used to convert all data to engineering units and to perform other basic data processing. The output from this processing includes data files that were plotted.

Note that the calibration procedure was and-to-end (transducer input to pr~*=d digital output) to eliminate the need to calibrate any and all parts of the process '

and thus simplify quality assurance (QA) of the data collection.

TR-ECCS-GEN-01-NP Revision 2 13

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FIGURE 3.9 DSI/OMB TEST SPECIMEN BOUNDARY / FLOW DEFLECTOR TR ECCS-GEN-01-NP Revision 2 23 l

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FIGURE 3.10 DSI/OMB TEST SPECIMEN BOUNDARY / FLOW DEFLECTOR WITH STRAINER ADAPTER TR-ECCS-GEN-01-NP Revision 2 24

1 4

OMO TOWING CARRIAGE

) \ / ( '-

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- ACCA25 ACCELEROMETER F1X, F2X, F3X. LATERAL LOAD CELLS .

(l-BEAM GAGES) _, a L.

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t BOUNDARY /FLOWDEFLECTOR g TEST SPECIMEN (PCI PROTOTYPE No. 2)

I I I FIGURE 3.11 LAYOUT OF OMB LOAD-CELL MEASURING SYSTEM ON SUBFRAME TR-ECCS-GEN-01-NP Revision 2 25

i 1

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,v m g - ANALOG INPUT .,

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Transducers Load Cells Accelerometer FIGURE 3.12 BLOCK DIAGRAM OF DATA ACQUISITION SYSTEM

- TR-ECCS-GEN-01-NP Revision 2 26

I 4.0 TEST PROCEDURE .

4.1 Test Matrix Sepante series of tests were undeitaken for the vnall Prototype No. Test-1 Strainer (100 Series) and the large Prototype No. 2 Stniner (500 Series). 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 'lables 4.1 through 4.5. The fum! test selection was dependent on the outcome of prior tests and was determined during conduct of the tests. 'Itc 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 seties 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/s' to the high value of 3 f'Js'.

(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 tavel 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 Resision 2 27

u I

suspected equipment malfunction.

4.2 Sequence of Testing Operations Each test series consisted of several separate stages:

t'a) Pmsetting and Verification of Planned Test Travel

'Ihe following sequence of operations occurred during travel setting, undertaken before the first series of tests:

• Programming the planned test motion sequence (travel) in the controller for the towing carriage. The planned distance for each test was 200 ft.

• Running the towing carriage through the programmed travel and recording motions via the data acquisition system.

• Recording independent motion measury snts of the carriage (distance and time, using tape measure a .d stop watch).

• Comparing idependent and instrumentation-acquired modon measurements.

= Reconciling any differences.

(b) Test Specimen /Imad-Measuring Fptem Installation The following sequence of operations occurred during test specimen installation:

• Mounting the instrumentation (load and acceleration transducers),

7

! Adapter and Boundary / Flow Deflector to the Subframe.

l

• Checking load cell preload and minimizing initial strain by shimming supports at bolt locations l

• Mounting test specimen to the subframe assembly.

• Mounting the subframe with attached test specimen and TR-ECCS-GEN-01-NP Resision 2 28

instrumentation to the towing carriage. The assembly was lifted into the basin and floated with ancillary buoyancy during the installation.

• Calibratmg all instrumentation (per procedure below) in the as-installed condition.

Towing Testing / Data Acquisition (c)

The following operations occurred during each towir.g test:

• Beginning with the first test in series, all data Goad on strainer and strainer acceleration and velocity) was recorded by the data acquisition system during conduct of the test. The standard data acquisition rate for towing tests was 8 amples 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 carnage 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 Acquisition 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 i

I specimen underwent submerged free oscillation.

• Response data Coad on specimen and acceleration) was recorded l

I TR-ECCS-GEN-01-NP l 29 Revision 2 l

i i

)

by the data acquisition system during the test. He standard data .j acquisition rate for free vibration tests was 50 sample; per second for each channel.-

• Following each test, the data was pr-=~f and plotted as :-

' 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 4

De test strainers were weighed and the center of gravity determined by measurement (by balancing, single-point suspension and two-point weighing).

He significant geometric dimensions, as indicated in the outlines of Figrres 2.3 and 2.4, were checked and significant discrepancies noted as indicated in Section 2.2.

I 4.4 Transducer / Instrumentation Calibration 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 I B.

The calibration procedure was an end-to-end process (input to output) to eliminate the need to calibrate any and all parts of the process r.nd thus simplify QA of the data collection.

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 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 force was approximately equal to the applied force. The applied load was 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 Revision 2 30

_ _ _ . ._ ___ _ _ _ _ . _ __ _ _ . . _ _ _ _._. _ . _ _ _ . . _ ~

' The recorded data values and plotted output were compared and reconciled with

' the applied load.' No_ dim.ip.cies (within reasonable tolerances of i2%) were evident throughout the test program. 4 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. ,

n 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 32 , from +g to 1

-z). Smaller rotations (up to 15 degrees) were used to calibrate to low accelerations. The rotations were applied by means of an angle computer.

4 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.

5-4.6 Test Data Analysis

- Preliminary analysis of the acquired data r.onsisted of plotting all measured responses as a function of time, and checking against independent measurements of parameters (e.g. time and distance) where possible.

For guidance, values of drag forces, F., at different velocities, U, with

- assumptions of 0.6 and 1.0 for the drag coefficient, C., based on projected area normal to flow, A, were calculated, as indicated in Table 4.6. All calculations 4-were based on a water mass density, p, of 1.9366 lbf- s'/ft* (20 C'). F, was determined using the classical relatioaship (Reference 1.2):

~

Eq[1]

F,=jC,pA44 1

Similarly, values of inertial forces, F., at accelerations, dU/dt, of 1.5 and 3.0 ft/s2, with assumption.s of 1.0,1.5 and 2.0 for the inertial mass coefficient, C.,

based on displaced enclosed volume, V, 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

weight, C pgV (contained and Added mass). F, was based on the widely accepted relationship:

Eg[2]

F, = C, p V dU/A 4.7 Test Monitoring .

All tests were monitc-ed and witnessed by quallfled test engineers.

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I TR ECCS-GEN-01 NP Resision 2 - 32 i

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TABLE 4.1 t MATerY FOR 100 EKnIFR TF373 SMALL STACKED DISK BOLT-ON STPAINER PCI PROTOT(PE FO. TEST 1 t

t Target Target  ;

TW Velocity Acceleration Comments Number (Ws) (Ws) 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 d105 10 G.!

d105a 10 0.5 d1051 6 1.0 d1052 10 1.0 dl61 6 1.5 dl62 10 1.5 '

d171 6 2.0 d172 10 2.0 -

d181 6 2.5 dl82 d185 10 6

2.5 2.8 f

d186 6 3.0 dl87 10 2.8 d188- 10 3.0 1 d198 d198a d198b d198c d197 TABLE 4.2  :

TR-ECCS GEN 01 NP Resision 2 33 __

l MATRIY FOR 200 SERIES TESTS DSUOMB STRAINER ADAPTER / BOUNDARY ASSEMBLY ALONE Target Target TM Veloc ty Acceleration Comments Number (Ws) (Ws')

d201 2 0.5 d202 4 0.5 3 d203 6 0.5 d204 8 0.5 d205 10 0.5 d252 10 1.0 .6 d262 10 1.5 d272 10 2.0 d282 10 2.5 d283 10 2.8 I d286 6 3.0 .V

- d288 10 3.0 f sw V

d298 d298a d298b TR-ECCS-GEN-01 NP Resision 2 34

TABLE 4.3 f MATRIY FOR 300 tRRfRt TESTS REFERENCE TEST CYLINDER WITH BOUNDARY - 30'$ X 33.25' LONG Target Target TW Velocity Acceleration Comments Number (ft/s) (ft/s')

d301 2 0.5 d302 4 0.5 d303 6 0.5 d304 8 0.5 d305 10 0.5 d352 10 1.0 d362 10 1.5 d372 10 2.0 '""

d382 10 2.5 2.8 I

d383 10 d386 6 3.0 'k d398 d398a d398b TR-ECCS GEN 01 NP Resision 2 35 l

f TABLB 4.4 MATRfY FOR 400 RPRIRR TESTS j REFERENCE!MPERVIOUS STACKED DISK ASSEMBLY COVERED PCI PROTOTYPE NO. TEST-1 Targd Target TW Velocity Acceleration Comments Number (Ns) (Ws') r d401 2 0.5 d402 4 0.5 A d403 6 0.5 'lr d404 d405 8

10 0.5 0.5 j d452 10 1.0 d462 10 1.5 d472 10 2.0 d482 10 2.5 d498 -[

d498a 8 d498b $

d498c d499 ,

TR ECCS GEN-01 NP Resision 2 36 ,

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+

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i TABLE 4.5 ,

t MATRfY FOR 500 EPRIFR TF3TS

[

1ARGE STACKED DISK BOLT-ON STRAINER PCI PROTOTYPE NO. 2 r

i Tand Tared Test Accelerati n Comments Velocity Number ,

(ft/s) (Ns) d501 2 0.5 d501a 2 0.5 '

d502 A 0.5 d503 4 0.5 8 0.5 ^

d504 d505 8 0.5 d505a 10 0.5 m:

d552 8 1.0 ,g d562 8 1.5 d572 8 2.0 d582 8 2.5 _

d587 8 2.8 d598 d598a g d598b v d598c d599 d599a TR ECCS GEN-01-NP Resision 2 37

l TABI.E 4.6 cat rULATFn DRAG FORCES Abd Projected Relative Drag Coefficient Ten Area Velocity (CJ Specimen A U (M) (ft/s) 0.6 1.0 2 12 20 4 49 82 Small 5.28 6 110 184 PCI Prototype (6.48) 8 1% 327 No. Test 1 10 307 511 2 28 46 PCI t ner 12.0 6

Prototype (14.3) 8 446 744 No.2 10 697 1162 2 16 27 4 64 107 Reference 6.93 6 145 241 Cylinder 8 258 429 30"$ x 33%"

10 402 671 Note: Projected area is net frontal area projected normal to flow direction. Gross envelope projected arets for the stacked disk strainers (including area of disk slots) are shown in parentheses.

TR-ECCS GEN-01 NP Revision 2 38

l TABLE 4.7 l CAT PtTLATED INFRTIA FOREF3 dhd Displaced Acceleration TM dU/dt Weight Mass Water Weight Tm W Coefficient Weight Wsi ,

3,;, W+ C,pgV Obs) C. V 3.0 Q Obs) 1.5 1.0 564 869 40.5 81.0 Small 1.5 846 115; 53.6 107 PCI Prototype 305 No. Test 1 2.0 1128 1433 66.8 134 8' 1.0 1638 2586 121 241 I8 "*'

948 1.5 2457 3405 159 318

' 2.0 3276 4224 197 394 No Reference 1.0 842 1166 54.3 109 Cylinder 324 1.5 1263 1587 73.9 148 2.0 1684 2008 93.5 187 30"4 x 33%*

l TR ECCS-GEN-01-NP i Revision 2 39 l

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FIGURE 4.1 EXAMPLE OF TARGET TRAVEL DEFINITION i

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TR-ECCS-GEN-01 NP Revision 2 40

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LAYOUT OF LOAD CALIBRATION SYSTEM TR-ECCS-GEN-01-NP Revision 2 41

5.0 RESULTS 5.1 Approach to Results Interpretation Consistent with the basic approach to empirical hydrodynamics as applied in the-l 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. De 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 j

structure loads in BWR suppression pools, i ne Morison approach considers the hydrodynamic force, F., to consist of a drag _

component, F,, and an inertial component, F,. De 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. De relationship is expressed as follows: l l

F = F, + F. Eq[3]

i where, F, = } Cs p A UM ud F, = C, p V 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). De 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

. ,+-~----------,,---~,-w,-n-_.,--...,,..-w.., .---,,-,,,,-m ,,,-.,r---,, u .-,-awe a~--------,- -am,-,-,-,n,r-.-e-w,,,ew,-,--w --e-w- e,-a -,-w .,.mve-m,n,,,,-

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body acceleration, the hydrodynamic inertial forces can be derived, from which an i effective mass coefficient, C., was determined, ne towing test results are ]

analyzed and discussed under the separate sections of constant velocity (aero acce'eration) and accelerated motion.  !

Constant Velocity Towing (Drag Forces)

)

5.2 The inidal 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 l i

the inertial forces were accordir. gly zero no that the total force can be attributed to 1

drag._ ,

For the towing tests with the high terminal velocities (10 Ns) and the low acceleration (0.5 Ns'), the duration of constant velocity is zero (for example, see l Figure 5.1, a velocity plot of Test d105a), ne constant velocity sections of the l high acceleration towing tests were used to obtain drag at high velocities.

ne history of total drag for each test was obtained by summing the three measured 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. nese tare drags were subtracted from the drag loads derived from the other towing tests to obtain the net drag forces, F., which are given in Tables 5.1 and 5.2.

The drag load was related to the net projected (frontal) area, A, and nominal velocity, U, to obtain a drag coefficient, C,. nese 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. >

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De d,ag results for the reference smooth bodies are presented in Table 5.2.

4

. TR ECCS-GEN-01-NP Revision 2 43 1

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A plot of the history of derived overturning moment (with respect to the flange elevation) for Test d187 is shown in Figure 5.5. De 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 d!87 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 l

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)

De 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.

De 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 t significant value for the duratt on of the initial impulse (application of the target carriage acceleration). Thus the incremental horizontal force applied to the test specimen is solely the inertial force due to the incremental acceleration from rest to 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 accelemtion 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 expressed as weights, mass g, in the table.

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The coefficient of hydrodynamic mass was subsequently derived from the following:

TR-ECCS GEN-01-NP Resision 2 44 i

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_ _ _ . _ _ _ _ . _ _ _ _ ..-_ _._ _ _ _ _ . _ ._.-_._._ __ _-i

C,, = (F,- F,- F)/pgV Eq[4]

ne calculated hydrodynamic mass coefficients for the large strainer, based on

~

i enclosed displaced volume, range from < Proprietary Information Removed >. i These results are not unexpected as discussed below.

Results for the small strainer indicate < Proprietary Information Removed >

A_ sample result for the reference smooth impervious strainer body is provided in - l Table 5.4 and indicates < Proprietary Information Removed >. As discussed l below, the existence of vortex shedding tended to complicate response for the smooth stacked disk and thus the results proved to be unreliable.

5.4 Free Vibrations The free-vibration response of the quick-release tests on each of the test specimens in the carriage-mounted submerged condition was analyzed to determine:

a. Test specimen natural oscillation frequencies i

b. Test specimen free-vibration damping ne 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,8, typically using three or four cycles of response:

8 = In(X,.i/X ,)=2n(C/C,,)(w/w) (Reference 5.1) Eq[5]

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 i history in one of the horizontal load cells is shown in Figure 5.9 which indicates the r.

Initial offset due to applied load.

! Results for the four test specimens are summarird in Table 5.5.

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TR ECCS GEN-01-h?

45 l . Revision 2

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TR-ECCS-GEN-01 NP Revision 2 46

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TABLE 5.1 CONSTAMP VMI OCrrY TOWING TEST DMULTS STRAINFR DRAG FORPF3 Total Support Net Calculated Projected Nominal Area Velocity Drag Drag Dg Test F, F, F/U' Coefficient Number A U F Obs) Obs) (C,=2F/pAU')

(ft') (ft/s) Obs) d101 d102 3 d103 5.28 11 i

d103a d104 d104 Prctotype No. Test 1

}i ,

l d105 (Small) d105a

~

d501a d502 I

d503 12.0 d504 d505 Prototype y l

d562 No.2 d572 (Large) i d582 d505a l

l i

TR ECCS-GEN-01-NP Revision 2 47 -

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TABLE 5.2 CONSTANT VFf N'ITY TOWING TEST 2RRULTs RFFFRENER BODY DRAG FORr'F3 ,

Projected Nominal Total Support TN Calculated Test Area Velocity Drag Drag Drag I F, F, F/U' Coefficient Number A U F (Ibs) (Ibs) (C,=2F/pAU')

(ft') (ft/s) (Ibs) d301 d302 d303 6.92 d386 d304 Smooth d362 Cylinder d305 $

b

~

d401 d402 I

d403 5.28 d404 d405 Smooth y d452 Impervious d462 Strainer TR-ECCS-GEN-01-NP Revision 2 48

TABLE S.3 f:h 5E "Q

y t,

IhTITAL IMPUISE TOWING TEST RESULTS SMINER INERTIA FORCES Test Impulse Impulse Inertial Support Net Mass h Weight Weight Weight Coefficient Test Speci:nen Acceleration Force

Number Weight dU/dt F. W. W. W -W, i

C ,=

(Ibs) (ft/s') (Ibs) (ibs) (Ibs) (Ibs) (W -W,-W)/pgV d187

, dl86 Prototype d185 No. Test I d182

% d171 W=305 dl62 pgv=564 dl61

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d572 No.2 i

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y INITIAL IMPULSE TOWING TEST RESUL'13 6

m REFERENCE SMOOTH CYllNDER INERTIA FORCES 2:

N k Test Impulse Impulse Inertial Support Net Weight Weight Mass Test Specimen Acceleration Force Weight Coeffichst i Number Weight dU/dt F. W. W, W, -W, C.= ,

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TABLE 5.5 FERR VIRR AT10N TEST RRCULTJ  ;

Critical Test Test Frequency Damping Number Specimen (Hz) bdo d198 Prototype d198a No. Test 1 d198b d398 Sm th d398a Cylinder d398b d498 Smooth _

d498a Impervious g d498b Strainer ,

d598 d:

Prototyp V d598a d598b No.2 d598c TR ECCS GEN 01-NP Resision 2 51

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PROTOTYPE NO TEST-1 DRAO FORCE HISTORY -TEST 1 iQ4 TR ECCS-GEN-01 NP

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SUPPORT DRAG FORCE HISTORY - TEST d203 i TR-ECCS-GEN-01-NP i- Revision 2 55 l

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DERIVED OVERTURNING MOMENT HISTORY - TEST d187 I  : TR-ECCS-GEN-01-NP Revision 2 56 L

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TR-ECCS GEN-01-NP Revision 2 57 i

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< Proprietary Information Rensoved >

I FIGURE 5,7 PROTOTYPE NO. TEST-1 FREE VIBRATION ACCELERATION - TEST d198a TR-ECCS-GEN-01-NP Revision 2 58

--.6 ..w-p- . ., ,w... , - ,a%--

9 3 ,

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< Proprietary Information Removed >

Pages 25 59 4

i FIGURE 5.8 PROTOTYPE NO. 2 FREE VIBRATION ACCELERATION - TEST d598 TR-ECCS-GEN-01-NP >

< Revision 2 59  ;

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

i I

r

< Proprietary Information Removed >

FIGURE 5,9 PROTOTYPE NO. 2 FRcE VIBRATION LOAD CELL FZ1 FORCS - TEST d598

.TR-ECCS-GEN-01-NP Revision 2 60

i 6.0 DISCUSSION OF RESULTS 6.1 Approach to Results Interpretation

'Ihe 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 etions from a constant value in the test specimen acceleration, due principally t( cwge acceleration control through the servo-system and local vibration modei w t12 carriage structure. This variation made separation of drag and inertia forces difficult and thus use of initial impulse information became the preferable approach.

6.2 Coefficients of Drag The range of derived drag coefficients, C,, for the smooth cylinder < Proprietary Ir. formation Removed > is reasonatie when compared with classical empirical data 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 cylinder and the artificially non perforated stacked disk. The perforations were anticipated to increase drag resist. nee (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 U.5) times that of the reference cylinder.

6.3 Coefficients of Hydrodynamic Mass The standard inertial mass coefficient of 2.0 for a cylinder refers to tne two-dimensional body i.e., an iafinitely long cylinder. Three-dimensional correction to C., per accepted ABS niles (Reference 6.1), for the reference cylinder would suggest a correction factor, K, of 0.83 considering the flanged-end boundary as infinite (1er.gth 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 TR-ECCS-GEN-01 NP Revision 2 61

behavior, would be expected to lie between the values derived assuming no boundary effects at either end and a full boundary at the flange end. For the small strainer (assuming a cylinder based on the disk diameter) the resulting corrt . tion fe: tor ranges from 0.55 to 0.83, and for the large strainer, from 0.65 to 0.88.

Dus 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, ne three-dimensional end effect is expected to be less for the perforated strainer than for the impervious smooth cylinder due to the relatively less restricted flow afforded the perforated body (which is reason for the lower inertial hydrod3 mamic mass coefficient in the first place i.e., less contained and entrained fluid).

6.4 Vortex Shedding

< Proprietary Information Removed >

l l

TR-ECCS-GEN-01-NP Revision 2 62 l

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

1 6.5 Free Vibrations l Comparison cf 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 considerrbly 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 specimen, the ratio of frequencies is inversely proportional to the effective mass of the system,

< Proprietary Information Removed >

These results strongly support the lower hydrodynamic mass coefficient values for the perforated bodies when compared with traditional smooth impervious cylinders.

6.6 Perfontions and Hydrodynamic Mass Coefficients The hydrodynamic mass for the analyses of submerged structures in ECCS suppression pool applications is typical!y based en an inertial mass coefficient, C.,

~

TR-ECCS-GEN-01-NP Revision 2 63

>y,

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

l :

.i

' of 2.0, denned such that the added mass coefficient is 1.0. With this definition, the -

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, ne perforations

> - effectively negate or " relieve" the pressure. De degree of " openness" required to allow thl pressure relief has not been determined here but is judged to be small.

4 6.7 Application of Test Results A number of factors, principally geometric, are likely to affect the hydrodynamic parameters derived from these tests, nese geometric factors are shown in Table 6.1 and include: ,

< Proprietary Information Removed >

The hydrodynamic parameters derived from the test results of this investigation are applicable to stacked disk strain:rs similar with respect to the above geometric parameters to those tested.

TR-ECCS-GEN 01-NP Revision 2 64

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 'Ihickness Ratio 1.66 0.90 Spool Length to Diameter Ratio 0.31 0.23 40 % 40 %

Strainer Hole to Surface Area Strainer Hole Diameter 1/8" 1/8" TR-ECCS-GEN-01-NP Revision 2 65

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

4 i i ii 1.4 tilii i i i s i liti i, a i e i nizi Erwomely rough 1,2 .

= = = = = . . . Y sylinder 1.0 - Cylinders with%

enoderate  %

Cp o.6 - ==ias row * \ -

M

.[.-..-. ,%

0.6 -

f

, ,,,,,,i , , ,,,,,i , , ,,

,,,,i ,

. 5 '. 8 x 10' 9 5 10s 10' 10s Reynolds numter FIGURE 6.1 RECOMhENDED DR.AG COEFFICENT VALUES (Reference 6.2)

TR-ECCS-GEN-01-NP Resisjon 2 66

- - . . . - - .~. . . . . . . ..

9

< Proprietary Information Removed >

FIGURE 6.2 SMOOTH IMPERVIOUS STRAINER DRAG FORCE - TEST d472 TR-ECCS-GEN-01-NP -

Revision 2 67

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

7.0 CONCLUSION

S A test program was conducted to invesugate the behavior of large capacity stacked disk ECCS suction strainers subjected to accelerated separated fluid flow fields. Empirically bued values for the coefficients of constant velocity drag, C., and hydrodynamic (inertial) nass, 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 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 mWor dimensions.

< Proprietary Information Removed >

• The resultant coefficient of in:rtial mass, C., is substantially lower than that for an impervious smooth cylindrical body of same major dimensions.

< Proprietary Information Removed >

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.

TR-ECCS-GEN-01-NP Resision 2 68 i

8.0 REFERENCES

1.1 NRC Bulletin 96-03, " Potential Plugging of Emergency Core Cooling Sueti'.,n 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., "'Ihe 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 2.2 Performance Contracting, Inc., Engica: red 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,

" Hydrodynamic Mass Determination for PCI Sure Flow ECCS Suction Strainer",

Report No. VQl6RD.F13, Rev. O, November,1996 3.2 386-MATL.AB for 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 of Fixed Structures Subject to Wave and Current Action," Report UR8, June 1977.

l-l l

L i'

TR-ECCS-GEN-01-NP L Revision 2 69

- - . . - . . . . . =. . . . . .- .. . -

9 9

i J

HYDRODYNAMIC INERTIAL MASS -

- TEdTING OF ECCS SUCTION STRAINERS - .

APPENDIX A LIST OF TESTINSTRUMENTATION

+

- TR ECCS-GEN-01 NP -

' Revision 2 A-1

-_ - ~

i l

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. Imad Indicators Bending Beam Load Cell, Transducers Inc.

Model T363-lK-20P1, S/N 06012 Weighing Indicator, A&D Co. Ltd, Tok,jo Model AD-4316, Option List 01020304, S/N B 0800812

3. Accelerometer Q-Flex Servo Accelerometer, Sundstrand Data Control, Inc.

Model QA-70'), P/N 979-0700-001, S/N 7948

4. Angle Measurer Angle Computer Co., Inc.

S/N C274

5. Tachometer OMB Towing Carriage Tachometer PMI Model 12FS 089 TR-ECCS-GEN-01-NP Resision 2 A-2

9 HYDRODYNAMIC INERTIAL MASS TESTING OF ECCS SUCTION STRAINERS APPENDIX B CALIBRATION DATA TR-ECCS ' - 3N 01-NP Revision 2 B1

B-1. I. cad Calibration All weights used for load Calibration and calibration checks were veri 6ed as being within the maintenance tolerances applicable to scales according the appropriate 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 Refert.nce Load Indicator was directly checked against the certified weights.

TR-ECCS-GEN-01-NP Resision 2 B2

4 I

< Section B-1 information is proprietary in its entirety >

Pages B3 - B12 TR-ECCS-GEN 01-h?

Resision 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 bad Indicator which was calibrated using weights traceable to the NIST, as discussed in Section B-1. ,

TR-ECCS-GEN-01-NP Revision 2 B-13

1

< Secilon B-2 information is proprietary in its entirety >

l' ages B14 - B20 TR-ECCS-GEN-01-h?

Revision 2 B-14

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

l l

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%)

l.

1 L

t l

TR ECCS-GEN-01-NP Resision 2 B-21

< Section B-3 information is proprietary in its entirety >

TR ECCS-GEN-01-NP Revision 2 B-22

TR-ECCS-GEN-05-NP Revision 1 September 1997 HYDRODYNAMIC INERTIAL MASS-TESTING OF ECCS SUCTION STRAINE.RS SUPPLEMENT 1 - FREE VIBRATION DATA ANALYSIS Test Repon No. TR-ECCS-GEN-05-NP

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Duke Engineering & Services, Inc., 215 Shuman Blvd. Naperville, Illinois 60563 Ph. (630) 778-0100

-_ _ _____ ___ _ ____. _ ___1_

i DUKE ENGINEERING & SERVICES, INC.

COMPANY DISCLAIMER STATEMENT ,

i

. Please Read Carefully

'!he purpose of this report is to document the results of a hydrodynamic test program conducted by Duke Engineering & Services (DEAS) 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 completenen, accuracy, or usefulness of the information contained herein, or tint 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 repon is also an unpublished work protected by the copyright laws of the United States of America.

l l

I TR-ECCS-GEN-05 NP Revision I li l

l

TABLE OF CONTENTS Fage LIST OF TABLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iv LIST OF FIG URES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v INDEX OF NOTATIONS AND VARIABLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . vi

1.0 INTRODUCTION

..........................................I 1

2.0 B ACKG ROUN D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1 3.0 TEST PROCEDURE AND DESCRIPTION OF TEST SPECIMENS . . . . . . . . .

1 3.1 Free Vibration Test Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Description of Test Specimens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3.2 3.3 Self Weights and Enclosed Water Weights of Test Specimen . . . . . . . . . . 6 4.0 TEST RESULTS AND DATA ANALYSIS .........................8 4.1 Free Vibration Test Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 4.2 Coef0cients of Hydrodynamic Mass . . . . . . . . . . ...............8 4.3 Interpretation of Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 4.4 Derivation of inertial Mass Coefficients . . . . . . . . . . . . . . . . . . . . . . 12 CON C LU SI ON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 5.0

6.0 REFERENCES

..........................................19 APPENDIX A FREE VIBRATION TIME SERIES PLOTS . . . . . . . . . . . . . . A-1 through A-87 TR ECCS-GEN-05-NP Resision 1 iii

LIST OF TABLES Page 3.1 PCI Prototype No. Test-1 Physical Properties . . . . . . . . . . . , . . . . . . . . . . . . 6 3.2 PCI Prototype No. 2 Physical Propenies . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.3 Reference Test Cylinder Physical Propenies . . . . . . . . . . . . . . . . . . . . . . . . . 7

.... 9 4.1 Free Vibration Test Results ..............................

Derived Inenial Mass Coefficients (< Proprietary Information Removed >) . . . 15 4.2 Derived Inertial Mass Coefficients (< Proprietary Information Removed >) . . . 16 4.3 Derived Inenial Mass Coefficients (< Proprietary Information Removed >) . . . 17 4.4 18 4.5 Hydrodynamic Mass Reduction Factors Duc To Perforations . . . . . . . . . . . . . .

TR-ECCS-GEN-05-NP Revision 1 iv

i LIST OF FIGURES Page 3.1 Layout of lead Calibration System .............................. 2 3.2 PCI Sure Flow" Strainer, Prototype No. Test-1 ......,............... 4 3.3 PCI Sure-Flow" Strainer, Prototype No. 2 . . . . . . . . . . . . . . . . . . . . . . . . . 5 TR-ECCS-GEN-05-NP Revision I v

INDEX OF NOTATIONS AND VARIABLES C. hydrodynamic acceleration (inenial mass) drag coefficient fsu, measured natural frequency of the suppon structure, Hz fn measured natural frequency of strainer test specimen, Hz fen measured natural frequency of Reference Test Cylinder, H Wsur total weight of support structure (hydrodynamic plus r2ir-weight), lbs Wn.mo hydrodynamic weight of strainer test specimen, Ibs Wcruco hydrodynamic weight of Reference Test Cylinder, Ibs V displaced enclosed volume, (ft')

Wn strainer air weight, lbs Weyt reference test cylinder air weight, lbs W n. tor strainer total weight (Wsy + Ws7.mo), lbs Weyt.ror reference test cylinder total weight (Wcyt + Wcruco), lbs p water mass density (1.9366 lbf-s2 /ft' @ 20*C)

W 3,c,ror effective specimen total weight (Wst. Tor + Wsup or Wcyt.707 + Wsup), lbs TR-ECCS-GEN-05-NP Resision I si

1.0 INTRODUCTION

This report is a supplement to Report No. TR-ECCS-GEN-01, " Hydrodynamic Inenial 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 report.

Some information presented in this report duplicates information presented in TR-ECCS-GEN-01. It is repeated in this repon 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 i 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 l Reference 1 provides a complete description of the free vibration tests. The test l procedure and test specimens are described again in this section to facilitate the use of this report.

3.1 Free Vibration Test Procedure l

t l 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 then quick-released by cutting the line and the test specit..en underwent submerged free oscillati' n. 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.

l TR-ECCS-GEN-05-h?

l Revision 1 1

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= LAYOUT OF LOAD CALIBRATION dYSTEM

- TR-ECCS-GEN-05-NP Revision 1 2

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

I Separate series of tests were undertaken for the small Prototype No. Test-1 Strainer (100 Series) and the large Prototype No. 2 Strainer (500 Series). 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).

3.2 Description of Test Specimens The two strainer test specimens consisted of the Performance Contracting, .nc.,

BWR stacked disk test strainers (PCI Sure-Flow Strainer, Prototype No. Test-1 2

and Prototype No. 2). The former is a relaiively small 6-disk strainer (65 ft ) 2 for nominal 10-inch pipe, whereas the latter is a large 13-disk strainer (170 ft )

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 inch :s, 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 stramer 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 end effects.

TR-ECCS-GEN-05-NP Revision 1 3

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- STIFFENERS,1/8"C.S PLATE OR LESS NOTE STIFFENER ORIENTATION MUST BE IDENTICAL ON EACH OtSK FIGURE 3.2 PCI SURE-FLOW STRAINER PROTOTWE NO. TEST-1 TR ECCS-GEN-05 hT Redsion 1 4

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L TR-ECCS-GEN 05-NP

,' Revision 1. 5 l

i i

A Reference Smooth Impervious Stacked Disk Assembly was created by r/ rapping the small perforated PCI Strainer Prctotype No. Test-1 with self adhesive clear plastic sheets (contaa paper) and duct tape to fully cover the entire strainer. Several 1/8 inch holes were punched through the plastic at the free end to allow flooding, ne purpose of this test specimen was to provide a direct comparison with the perforated stacked disk strainer, ,

r 3.3 Self Weights and Enclosed Water Weights of Test Specimen ne 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 PHYSICAL PROPERTIES Item Calculation Core Volume n/4*12.75 2*29.875 3,814 in' Disk Annular Volume 2

n/4*(30'.12.75 )*3.3125*6 11,511in' Spool End Volume n/4*10.752*3.375 306 in' Total Volume 3,814 + 11.511 +306 15,631 in' Water Weight 15,631*62.36/12' 564 lbs Strainer Weight (measured) 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 stramer weight to account for the wrapping material.

TR-ECCS GEN-05-NP

TABLE 3.2 PCI PROTOTYPE NO. 2 PIIYSICAL PRt)PERTIES Item Calculation Core Volume n/4*26'*48 25,485 in' 2 2 17,417 in' Disk Annular Volume n/4*(40 26 )(1.805*12 + 2.34*1)

Spool Volume n/4*24' *5.5 2,488 in' Total Volume 25,485 + 17,417 +2,488 45,390 in' Water Weight 45,390*62.36/12 8 1,638 lbs Strainer Self Weight (measured) 948.bs TABLE 3.3 REFERENCE TEST CYLINDER PilYSICAL PROPERTIES ,

item Calculation Water Weight (n/4*30'*33)*62.36/12' 842 lbs Cylinder Self Weight 305 + 19 (measured) 324 lbs Note: 19 lbs is the weight of the wrapping material and 305 lbs is the Prototype No. Test 1 self-weight l

TR-ECCS-GEN-05 NP

! Resision 1 7

7 9

4.0 TEST RESULTS AND DATA ANALYSIS 4.1 Free Vibration Test Results l

'the dominant oscillation frequencies were obtained by simple measurements  ;

from the oscillation history plots. Acceleration and load cell history records fo-the dumtion of free oscillation for both tk anall and large test strainers are givenin Appendix A.

i

Results for the four test specimens are summarized in Table 4.1. l

< Proprietary Infonnation Removed >

4 4.2 Coefficients of Hydrodynamic Mass The inenial or added mass accounts for the inertia of the fluid entrained by the accelerating stmeture. As the stmeture accelerates, the fluid surrounding the i structure 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). ,

As long as we maintain dimensional consistency we can equate the added mass term to an added weight term. For the remainder of this repon, we will utilize units of pounds force and refer to added weight and hydrodynamic weight. The t

total effective weight of a specimen vibrating in water is thus, the specimen s

weight, W, plus the hydrodynamic weight, CgpVg (contained and added weight).

4.3 Interpretation of Results Each strainer test specimen is supported by the same support system. The support system is effectively a rotational spring support at the strainer Gange.

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, i

.TR ECCS-GEN-05 NP Resision i . 8

_ . , _ ~ . _ . _ .

i TABLE 4.1 FRFR VIRRATION TEST RFRULTS ,

i Test Frequency  !

Test Number Specimen (Hz) 3 i

d198 Prototype d198a No. Test-1 A d198b }

d398 l

a:

Sm th g d398a Cylinder -

d398b d493 Smooth 3

d498a d498b Impervious Strainer fg, O

st d598 v d598a Prototype d598b No.2 d598c TR ECCS-GEN-05-NP Resision 1 9

Given that the stiffness of the suppon system is the same for each specimen and test, the ratio of frequencies is inversely proponional 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 suppon, thus (fn/fertf " Mevt + Wert n2n+ Wsu,)/(Wn + Wsuco+ Wsur) or (fn/fertf = (Wertior + Wse,)/(Wn. Tor + Wsur)

The C,, of the Reference Test Cylinder was conservatively set to 2.0. The standard inenial mass coefficient of 2.0 for a cylinder refers to the two-dimensional txxty 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, = 2.0, the total hydrodynamic weight of the Reference Test Cylinder can be calculated using the data given in Table 3.3 as:

Wert 7or = Weyt + Wert >uo = 324 + 2.0*842 = 20r1 lbs Since the suppon 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 suppon assembly is known, its precise hydrodynamic weight is not. However, an upper and lower bound of its hydrodynamic weight can be used in the calculations to bracket the resulting C,.

l TR ECCS GEN-05 NP Resision i 10

t I

4.3.1 Support Assembly Hydrodynamic Weight Upper Bound  ;

i j

Given a natural frequency of < Preprietary 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 l

with C, = 2.0, -

%'evuor = 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

?

(fsur/fery2 = (Weyo.7o7 + Wsur)/Wsur  !

of Wsu, = Weyt.7o7 / [(fsur/f CY h * !)

< 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 i Reference Test Cylinder would suggest a correction factor, K, of 0.83 considering the flanged-end bourxiary as infinite (length to diameter ratio,1/d =33.25/30.= 1.108 with one free end, so that the effective 1/d 4

is 2.217).

C = 0.83*2.0 = 1,66

< Proprietary Information Removed >

cTR-ECCS GEN-05 NP 3 Revision 1 11

' i t

i 4.3.3 Support Assembly Hydrodynamic Weight - Lower Bound i

As a third coraparison the hydrodynamic weight of the strainer support system is neglected and the coefficients derived directly from the square jl 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 derived values of C for Prototype No. Test 1 and Prototype No. 2 are now less consistent, indicating the importance of considering the 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 Derivation of Inertial Mass Coefficients (C )

P As discussed previously, C, for any strainer specimens can be generally calculated as follows: ,

C , = W sraco/ VP 8 = (Wn. Tor-Wst)/P Vg Also, as previously discussed, C, for the strainer test specimens will be calculated relative to the Reference Test Cylinder (C,=2.0).

Recalling that:

i (fsr/fcyt)2 = (Weyt,7o7 + Wsup)/(Ws7.ror + Wsu,)

Then:

t C, = [(fert/fs7)2 (Wcyt ror + Wsu,) - (Wst + Wsup)}/pVg I

TR ECCS-GEN-05 NP -

. Resision i 12.

__ __ _ __ . _ . ._ __ .~_ _ _ _ __ _ _ _ _ - - - . _ - .

i For convenience, we develop an effective weight ratio by derming the frequency ratio:

- f,=f ir/ fen i

i Then the effective weight ratio can then be dermed as: j

(' ,

(1/f,)2 .

This remits in:

- C, = [(1/f,)2 (Wen,rar + Wsur) - Mst + Wsur)}/ VP8 Additionally, the effective specimen hydrodynamic weight can be calculated as:

Wst.tuo = C, pVg i

The effective total test specimen weight is calculated as: ,

Wsrc. Tor = Wst.tco + Wsr + Wsur The resulting mass coefficients are given in Tables 4.2 through 4.4 for a l l 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)' (33 in) = 23,326 in' Weight (pVg) = [(23,326 in')/(1728 in'/ft')](62.36 lb/ft') = 842 lbf -

l i

i I

~ TR-ECCS-GEN-05 NP

.- Revision 1 13

PCI Prototype No. 2 Volume = n/4 (40 in)2(54 in) = 67,858 in' Weight (pVg) = [67,858 in'/1728 in'/ft'] 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 piovided in Table 4.5.

4 TR-ECCS-GEN-05-NP Revision 1 14

TABLE 4.2 DERIVED INERTIAL MASS COEFFICIENTS STRAINER SUPPORT HYDRODYNAMIC WEIGHT W st.p = < Proorietary Inform =* inn Ramaved >

1 E Nectrwe 117 0 _^, . _ . _ Ifydrodyimnue ,

Specunen Mass Mass

• W Coefficma i pVg(M) pVg(M) s'requency Teast w@

Tm M (Tacimed Cylmder " Raus M (W) w1tenpect te w1tespect w W (Fulared Stracer (Hz) P spec =nen +W) Enclosed h

%3  %) g; (W Esiclosed C)immeur l p, w_ or  %  % >

(W,,+W ,) ( q

. Referern.c 324 N/A 842 Tess

Cyi.nder sa='* 308 564 842  ;

tenrerwass 5""c' < Propnetary Information Remmed >

1

- rreem 305 564 842 No Test-l ,

Pream 948 1638 2449

!- No 2 i

Note: 1. C,, for the Reference Test Cylinder is conservatively assumed to be 2.0.

2. C,, = [(l/f,)* (Wmor + Wstr)- (Ws1 + W3t,)PpVg ,

3. Wsec = C,, (pVg) + (W,, + W31 .,,) [

1 i

i

'l TR-ECCS-GEN-05-NP 15 Revision 1  :

i s

[

1-i

. TABLE 4.3 i

DERIVED INERTIAL MASS COEFFICIENTS l ,

STRAINER SUPPORT HYDRODYNAMIC WEIGHT Wu = < Proorietsrv Infw = *-, Remnved >

E5ectree H, ". ", H,L",

specwnen Mass Mass i S"""

P pVg(re() pVg(thf) Frequeicy CeeSicise Test M I" @ TealWeW Corfrecient l

(Embed Sammer) (Enctowd Cylmder Ratio (Ibr) w' Respect to wRespect to i St =cumn We# Vohsme Vohame) r. (Wm+ ) Enclosed Susumer Enclosed cytwider j (%wW) (3Tf , y% vh 1

(%., * %) c. c.

! R d m nce 324 N/A 842 i Tee '

Cyleder 1 i sammh 308 564 842

-

..r. .a s= ==er < Propnctary Information Removed >

hadn* 305 564 842 Na Tem-I a s

nadn* 948 1638 2449 ,

%2 Note- 1. C,,, for the Reference Test Cylinder is conservatively assumed to be 2.0. ,

i

2. C,,, = [(1If)2 (Wmwr + Ws u) - (Ws, + W3u)]/pVg

3. Wsrc = C,(pVg) + (W3 r + Wsu) t  !

t i

L 1

TR-ECCS-GEN-05-NP I Revision i 16

I.

TABLE 4.4 i

DERIVED INERTIAL MASS COEFFICIENTS i l STRAINER SUPPORT HYDRODYNAMIC WElGHT W , = < Pronrieemrv lafe n===aved >

i i Esecim  ::, r,  ::, u ,

syncismee Moss - Mese i SPecanes .. py, ggg) py, geg) p ,,,,,,

Ehm . Toast Weiges CarfReiess Caefficiess Tem Ar (Fachmed Stras v r) (Encamed Cytmeder " Rate - *M - (ht) =tRespect to s/Regect to 5pecusen WeW Veemme Volumne) ( "

(Wcu ns + Wm .) FM stromer Eschmed Cykeder (Wm er W,) U/Lf - ,,- Veemsme Valmene j (Wom + W ) c. c. i

Reference 324 N/A 842 .

Test --  !

Cylinder i i

! Smooth 308 564 842 i Impervious l Strainer < "roprietary Information Removed >

s .

Prototype 305 564 842 ,

No. Test-1 t Prototype 948 1638 2449 i

No.2 ~

I

' Note: 1. C,, for the Reference Test Cylinder is conservatively assumed to be 2.0.

2. C,, = [(l/f,)2 (Wcym + Wn .,.) - (Wu + Wn ])/pVg  ;

l

3. Ws,.c = C,,(pVg) + (Wu + Wn,)

I

}

(

t

'I R-ECCS-GEN-05-NP 37  :

Revision 1  !

! i i

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

I TABLE 4.5 i

HYDRODYNAMIC MARS COEFFICIENT (C7 )

COMPARISON FOR A PERFORATFD AND A SMOOTH IMPERVIOUS STRAINER Estimate Suppon Weight C, Ratios Wsu, (Perforated / Impervious)

Upper Bound Best Estimate < Proprietary Information Removed >

IAwer Bound r

t-4 TR ECCS ..JS1-05-NP Resision i 18-

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 coefGelent, < Proprietary Information Removed Comparison of the results for the small strainer tests alone, as a impervious non.

i 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 i specimen. Using the derived C values, the C ratios (perforated strainer / smooth impervious strainer) range from < Proprietary Information Removed > .

< Proprietary information Removed >

6.0 REFERENCES

1. Duke Engineering & Services, Inc., Report No.: TR ECCS-GEN 01, ,

"llydrodpamic 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 l

3. Performance Contracting, Inc., Engineered Systems Division, Kansas, ECCS Suction Strainer, Drawing Number: ECCS 003 Rev 1,07-3195

4. American Bureau of Shipping, " Rules for Building and Classing Mobile Offshore Drilling Units," 1980 Edition.

TR ECCS-GEN-05-NP Resision l' 19

APPENDIX A FREE VIBRATION TIME SERIES PLOTS TR ECCS-GEN-05-NP

• " ^

i I

i l

NOTE: In the plots for Tests d598, d598b and d598c, the time scale is factored by 6.25, i.e.100 seconds displayed on the plots is 16 seconds real time. l r

f r

?

P L

f 4

. TR ECCS-GEN-05.h?

Resision 1 A2

< Information on pp A-3 through A-87 are proprietary and have been removed >.

I~,

TR-ECCS-GEN-05-NP Resision 1 A-3

,