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0 Enclosure 1 Modal Testing and Analysis
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INTRODUCTION Lawrence Livermore National Laboratory (LLNL), in cooperation with Agbabian Associates (AA), proposes to perform dynamic (modal) testing of the JAERI-CRT wetwell. The results of these tests will be a data base which will provide the modal parameters (frequency, damping, and participation factor) of the wetvell over the frequency range of 0 to 150 Hz. This range of frequencies is of particular interest because pressure suppression experiments at this facility yield pressure time histories that have this same frequency content.
Two sets of tests are contemplated; one before and one after the wetwell structure has been stiffened. These two data bases will permit pressure suppression experiments after the stiffening to be compared to those before.
BACKGROUND Dynamic testing is a process in which a structure is set in vibrational motion by the application of an excitation or input forcing function. The resulting time-history' motion of the structure (at several locations) is measured and captured on computer disks or magnetic tape. These time histories are then computer analyzed to determine their characteristic properties. (The time history of the forcing function is also recorded and analyzed.) The typical approach taken is to assume that the output function can be described by a particular formula which contains several constants or parameters. Those .
parameters are then determined by fitting a ct.rve to the actual data. As it
( fortunately turns out for structural systems, these parameters have physical meaning which are the natural frequencies, dampings, and mode shapes of the structure.
At the request of the United States Nuclear Regulatory Comission (NRC-RSR)
LLNL conducted a two year (FY79-80) research project DTOR (Dynamic Testing of Reactors, FIN #A-0128) which established the feasibility and usefulness of dynamically testing massive Nuclear Power Plant (NPP) structures. Two portions of this research are of relevance to this proposal.
(a) AA described a methodology of safely exciting various NPP structures with short duration pulses or pulse trains. They also demonstrated the feasibility of recording the resulting time-history motions.
(b) LLNL demonstrated the accuracy of their system identification computer programs for processing structural time history motions and extracting the modal par neters of the structures.
The details of both of these portions of the project can be found in LLNL report UCRL-52732 which was presented to the NRC (1980).
LLNL and AA recently cooperated to dynamically test massive plutonium handling facility structures at Rocky Flats. In this effort AA excited the structures and recorded the resulting time history motions while LLNL analyzed the data using their frequency domain system identification codes. Basically, we propose to use the same type of cooperative effort to perform the dynamic test on the JAERI-CRT wetwell.
o O
Enclosure 1 (cont'd) b SCOPE OF WORK Shown in Figure 1 is a sketch of the JAERI-CRT wetwell which illustrates six (6) structural items of interest.
(1) Outer Shell (2) Inner Shell (3) Wetwell floor plates (4) Ventpipes (5) Diffuser floor (6) Ladder AA will perform the dynamic testing of these structural systems and provide the resulting data to LLNL for computer processing. Major modes of each structure between 0 and 150 Hz are of interest. The dynamic testing will be conducted in two separate on site visits and each test will be performed with the wetwell filled with water.
The first visit (to be taken in the March 1 - 25, 1981 timeframe) will concentrate on structural systems 1 - 3 with a secondary (exploratory) examination of structural-systems 4 - 6.
The second visit (to be taken in the June 15 - July 10,1981 timeframe) will repeat the previous test on structural systes 1 - 3 which will have been j stiffened. Also, using the results obtained on structural systems 4 - 6 from the previous visit, a more thorough examination will be conducted on them.
The test results will then be given to LLNL who will use their system identification codes to obtain the dynamic (modal) properties of the structures in question. Upon completion of this analysis AA and LLNL will collaborate to produce a final report in the form of a UCRL. In addition to the modal characterization of the indicated structures, this report will contain a description of the test performed as well as a listing of the data base containing the modal parameters of the structures.
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user Floor
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Enclosure 2
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Proposed Locations of the Flush Diaphragm Pressure Transducers (SensoMetic Model 601087)
(JAERI-CRT Wetwell)
Current New Transducer Channel Code Measurement Location FDV-1 VPPF-101 VP1 (0.5m above outl.)
FDV-2 VPPF-201 VP2 (0.5m above outi.)
FDV-3 VPPF-301 VP3 (0.5m above outl.)
FDV-4 VPPF-401 VP4 (0.5m above outi.)
FDV-5 VPPF-501 VP5 (0.5m above outl.)
FDV-6 none VP6 (0.5m above outi.)
FDV-7 none VP7 (0.5m above outl.)
FDB-8 WWPF-101 Pool bottom. Centered under VP1 FDB-9 WWPF-102 Pool bottom. Centered under VP2 I
FDB-10 WWPF-103 Pool bottom. Centered under VP3 FDB-11 WWPF-104 Pool bottom. Centered under VP4 FDB-12 WWPF-105 Pool bottom. Centered under VPS FDB-13 none Pool bottom. Centered under VP6 FDB-14 none Pool bottom. Centered under VP7 FDW-15 none Wall beside VP1 (3.6m above bott.)
{ FDW-16 WWPF-202 Wall beside VP2 (3.6m above bott.)
FDW-17 WWPF-302 Wall beside VP3 (3.6m above bott.)
FDW-18 WWPF-402 Shell beside VP3 (3.6m above bott.)
FDW-19 WWPF-502 Shell beside VP4 (3.6m above bott.)
FDW-20 WWPF-602 Wall beside VP4 (3.6m above bott.)
FDW-21 WWPF-702 Wall beside VP7 (3.6m above bott.)
FDW-22 none Wall beside VP6 (3.6m above bott.)
FDW-23 none Shell centered between VP1 and VP6 (3.6m above bott.)
These proposed locations are shown on the following sketch.
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LADOENCE Lf UERMORE L ABORAVORY UNIVERSITY OF CALIFOCNI A FILE NO. POGI
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Enclosure 3
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Application of LLNL Supplied Senso-Metric Model 601087 Flush Diaphragm Pressure Transducers to the JAERI-CRT Wetwell Contents a) Transducer specification b) Transducer installation plan c) Transducer installation hardware
- 1) outline of LLNL modified Senso-Metric transducers ii) vent pipe installation assembly iii) wall and floor installation assembly iv) cable splice junction box d) List of supplied parts
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Section a) of Enclosure 3
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Transducer Specification The transducers to be supplied by LLNL are custom-modified units (#601087) of the Senso-Metric model SP65C to provide extra protection against thermal transients and for underwater application (see UCRL-52314 - Instrumenting a Pressure Suppression Experiment for a Mark I Boiling Water Reactor - by W. M. Shay, W. G. Brough, and T. B. Miller,1977). Some of the specifications for the basic model - the external dimensions and the vibration, shock, and acceleration sensitivity - do not apply to the units provided. However, these transducers are believed to be adequate for the proposed measurements. The external dimensions of the LLNL modified transducers are shown in Attachment 4C, p. 1.
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GENERAL ow cost DESCRIPTION Senso-Metrics SP 65 series economy pressure transducers utilize bulk type h h reliability silicon semiconductor strain gages to obtain a big out ut signal level at a low cost. This solid state unit is speciScall designed to meet the needs of industrial and commercial Original Equipment Manufacturers, as well as for f
NO MOVING PARTS genersuaboratory uses.
These rugged devices have no moving parts which may wear or produce errors under conditions of sfiock or vibration. When
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EASY TO MOUNT "d-REPRESENTED BY:
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Higher performances available SENSO METRICS, INCORPORATED PHONE:(213)988 6070 Other transducers for other 7775 KESTER AVE., VAN NUYS, CALIFORNIA 91405 l applientions t
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, TECHNICAL SPECIFICATIONS 7
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( 3.1 Input Impedance .... .......... ...... .. . . . . . . . . . . . . . . . . . . . 1500 ohms nominal 3.2 Output Impedance . ... . ..... ......... . .............. . . . . . 450 ohms nominal
3.3 Excs.tation ....... ..... . . . .
. . . . . . . . . . . . . . . . . . . . . . . . 20 volts Max.
3.4 Output . ...... ............ .......... . ....... y 2". full seale open circuit SF 65 1 SP 65B SPS5D SF 65E PERFORMANCE OPTIONS / SP 65C )
4.1 Static Error Band (% FS BFSL) .5% c.25% .13% m.06% .05%
4.2 Therm. zero Shift (% FS/*F.) 2.02 .02 .01 =.01 .005 4.3 Therm. Sen. Shift (% FS/*F.) .02 .02 i .01 ) .01 .005 4.4 Zero Balance ................................ M . 2.0% Full Scale max.
4.5 R esolu tio n . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I n finit e 4.6 Operating Life . . . . . . . . . . . . . . . . . . . . . . . . . . . . undamaged by 3x10' Full Range cycles 4.7 Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . approximately 3 oz. less cable ENVIRONMENTAL 5.1 Temperature Range (compensated) . . . . . . . . . . . . . . . . . . . . . . . . . . 30 to 130*F standard 5.2 Operating With TFE Cable . . . . . . . . ... ..... . ........... . . . . . . -65 to 300'F 5.3 Vibration. shock and acceleration (15 psi range) less for higher ranges . . . . . . 0.015". Fu!! Scale / g.
5.4 Other Compensated Temperature Banges . . . . . .. . ......... . . . . . . . Consult Factory MOUNT!NG SUGGESTIONS i,...
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3.b Transducer Installation Plan k We propose that the wetwell floor and wall transducers be mounted on steel U-shaped brackets which are welded to the boundary. All necessary hardware is supplied so that only welding and mounting of transducers (estimated at 4 manhours total for the 16 units) is required to emplace each assembly.
It is requested that each bottom transducer be installed in-line with the corresponding vent pipe axis and that each wall transducer be installed in line with the vent pipe exit.
The vent pipe exit transducers are each installed in a boss welded in the vent pipe side, 0.5 m above the vent pipe exit. For this all required hardware is provided. As shown in the enclosed assembly drawing, a bored through hole and welding are required at each vent pipe. Total work required for the 7 units is estimated as 16 manhours.
Each transducer is supplied with a 10 m long integral cable extension. This is not considered long enough to provide connection to the JAERI DAS. It will be necessary for JAERI to splice the necessary cable extensions. Also, mechanical as well as water resistant protection is required for each transducer and its cable. JAERI will need to provide installation of 3/8" 0.D. flared tubing from the transducer to a point exterior to the wetwell environment. In order to accommodate the cable splice, a simple junction box, with necessary tubing fittings and B-nuts is supplied for each transducer.
Total labor necessary to provide tubing installation and cable splicing for the 23 transducer is estimated as 24 manhours.
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3.d List of Supplied Parts.
( Item No. Description Quantity No. to be Installed S ares Assembly nc u ed Drawing
- 1 Senso-Metric Pressure 30 23 7 1 Transducer with 3/8" flared fitting B-nut and "0" ring 2 Boss-vent pipe mount 8 7 1 3 3 #10-32 300 series stainless 50 28 22 3 steel socket screws x 5/8" long with lock washer 4 Fixture for welding mounting 1 - - 3,8 boss to vent pipe 5 Bracket-wall / floor mount 17 16 1 6 6 Spacer-bracket mount 72 64 8 6 7 #10-32 300 series, stainless 120 64 56 6 steel flat head machine bolt x1-1/2" 1g., elastic stop nut & washer 8 Waterproof cable splice 23 23 none 7 box with 3/8" flared fitting B-nuts 9 Extra B-nut and ferrule 20 none 20 -
for 3/8" flared fitting
- Refer to Attachment 4c.
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GKSS Postfach 1160, 2054 Geesthacht ReaktorstraBe 7-9. 2054 Geesthacht Teleton. 04152/121 Telen: 0218 712 okssg Dr. E W. McCauley Telegramm. GKSS - Geesthacht L-140 Lawrence Livermore National Laboratory P.O. Box 808 INSTITUT FOR ANLAGENTECHNIK Livermore, Ca. 94550 USA Ihr Zeechen ihre Nachricht vom Unser Ze chen- Bearbeiter: Telefon Durchwah. Datum AM/Vo/Ws Vollbrandt oos2a2 So8 9.3.81
Dear Dr. McCauley,
enclosed we send to you the following experimental material about CKSS 3-vent-tests and other material as we agreed with you during your visit at GKSS last month:
- 1. One mag tape LLL M 3 H content: ANA data (PC pressures) of test M 3 period: 192.1 till 372,1 S.
( BPS 779 job is listed in ' app. A' with the channel tabel we use.
The time axis has to be corrected by TDIFF = at (scrantime), see app. C.
- 2. Detailed test informations (plots and data lists) of the tests MI, M2, Mi-2, Mi-3 and Ml-4
- 3. Time correlation tabel to the high speed films of test Mi-4 and M2.
4 Two half year-reports on PSS-test program:
Oct. 79 - March 80 CKSS 80/1/35 Apr. 80 - Sept. 80 CKSS 80/1/36.
- 5. A copy of KfK-report No 2534:
Evaluation of IR probe measurements during PSS-Blow down tests in Marviken.
Resuming the talk about pressure measurements during your visit at GKSS in Febr. 81, we kindly ask you to prove, if it is possible, to rent for a limited time some flush mount type pressure transducers with the range i 100 psia, which LLNL has operated in NRC research work and which are not used now. It would be a great help for our multi-vent-PSS-test program, which is as you know also affected by budget cuts in the BMFT.
Sincerely yours r
f
( V (Dr.-Ing. Schultheia) (Vollbrahdt)
Encl. Copy: D r . lia um4i r t e l GRS-FB Dr. T. Lee USNRC 1 flp. hl .lo r et' (a8%8D44 F.it fe'l b..t'hf $n, ter H.8f ubg $ if 64 ,94m.n,f g Aritg8+ < thi ,44d lw8 g 880'Il I F 4 85 ( p 19' 49e s t6 t'e f.ed A M %e t, P, heit j
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