ML20209E039

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Objects to Taking Data in Japan & Sending to Lll.Preferred Way Is to Use on Line Data Analyzers Which Allow Individual to Repeat Tests If Something Looks Strange
ML20209E039
Person / Time
Issue date: 03/16/1981
From: Obrien J
NRC
To:
NRC
Shared Package
ML20209A640 List: ... further results
References
CON-FIN-A-0128, CON-FIN-A-128, FOIA-85-782 NUDOCS 8702040590
Download: ML20209E039 (1)
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Cire Chron MAR 5 1981 D1yisfony/f TLee V SFabic 7 MSullivan w , az w ~ a LCShao A$pano E. M& /<y LLL Br. M. Nozawa. Director C 4~*'** N Reactor Safety Division g.5,o/o i Japan Atomic Energy Research Institute -

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Ibaraki-kaa 319-1 JAPAN , ,,, , , , , ,,,,,

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Dear Dr. Nozara:

Subject:

Assistance by U.S. NRC/LLNL Liaison to JAERI-CRT program L The USMtC has followed your CRT program with great interest and will 3

continue to do so in the future. We are grateful to you for giving us the opportunity to receive results of this important program.

O dite .are wi. ,ou a .si,e to ndentand .e ,ossm, fa.m.,-dependent fluid-s ture interaction effects on pressure measurements in the CRT fact 11ty. urther, we share your concern regarding possible ambiguities erfsing from the transducers used in the wetwell pressure measurements.

These matters were discussed between our contractor (McCauley of LLL) and your staff (Messrs. Shiba and Namatame).

Tuo activities am recausended to help resolve these issues. The first is to conduct a modal testing and analysis of RT wetwell , both as-

, built and after its modification later this year. second is to install in the CRT wetwell some 23 flush diaphrasp pressure transducers i for use in your future tests. We would be happy to loan these transducers to you for this purpose.

l The modal testing of ee wetwell and subsequent analyses would be provided as no cG.i tv iver m1 program. We estimate that each of the two test ~s '

%, befvr and one after wetwell modification) would be completed in 5 days and would provide modal characterization of both the pedestal ,

. shells and the floor plates. No CRT staff assistance would be required i

except afd win. scaffolding, lights, and power. The schedule for these tests, of course, would be determined by you and your staff; we anticipate, however, that the first tests might be provided in March,1981 with your approval. Discussion of the purpose, as well as expected results.

is contained in Enclosure 1.

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I Dr. M. Nozawa MAR 5 1981 In order to pmvfde for a consistent pool messerment base, we urge you to consider installation of the 23 transducers as shown in Enclosum 2:

  • ene on each vent pipe (0.5 m from exit. 7 total)
  • ene centered below each went pipe (on the floor-7 total) .

ene opposite each andtheshells(9 total. vent,)at exit level, en the side walls In addition to these 23 transducers, we would also supply 7 spares for a total of 30 units. With your approval, these transducers and hardware

,can be skipped to you immediately. .

The pressure transducers are described in Enclosure 3. They are Senso-Metric Model 601087(0-100 psta) which include integral 10s-long shielded cable extensions. They have been modified for underwater use by addition of a standard 3/8" flared tubing fitting. In addition, they have been modified to resist thermal transients by addition of a RTV i

(room temperature vulcantzing) material to the diaphragm and body. With these transducers, we would also provide complete 21-point static calibration data for each transducer and t;ypical #namic response characterization, both as conducted at LLNL. '

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In addition, we would supply all the required mounting hardware and provide all required shipping charges. We would, however. expect your staff to install these units. Proposed installation details and estinates of JAERI manpower efforts are also provided in Enclosure 3. Enclosums 1 through 3 were supplied by Dr.; McCauley of LLL.

In offering this assistance to your program, we wish to seke clear that there is no intention to 1spose any change in liaison access to JAERI-obtained data. The USNRC expects ~ to share fully with you the results of the modal testing work.

We look forward to a favorable response to our recomendation. and we r thank you and your staff for the assistance rendered to our contractor in his 11alson work.

Stacerely.

Original Signed by L c.Shao

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Lawrence C. Shao.- Acting Director Division of Reactor Safety Research biene's F)$Mo'uY18ENFF6hi:6 paset J

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Enclosure 1

( Modal Testing and Analysis 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 wetwell over the frequency range, of 0 to 150 Hzdamping, This rangeand participationisfactor) of the of frequencies of particular interest because pressure suppress. ion 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.

time-history' motion of the structure (at several locations) is measured andThe resulting 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 curve to the actual data. As it

(' fortunately turns out for structural systems, these parameters have physical meaning

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which are the natural frequencies, dampings, and mode shapes of the

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90T THE REGOMMEtJ D ED METHOD At the request of the United States Nuclear Regulatory Commission (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.

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(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.

f (b) LLNL demonstrated the accuracy of their system identification i

computer programs for processing structural time history motions and

{ extracting the modal parameters of the structures. ,

t, 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 facility AA recently structures cooperated at Rocky to dynamically test massive plutonium handling 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 I propose to use the same type of cooperative effort to perform the dynamic test on the JAERI-CRT wetwell.

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Enclosure 1 (cont'd)

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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 comptater 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 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 tu 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 i base containing the modal parameters of the structures.

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Enclosure 2

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Proposed Locations of the Flush Diaphragm Pressure Transducers (SensoMetic Model 601087)

(JAERI-CRTWetwall)

Current New Transducer Channel Code Measurement location FDV-1 VPPF-101 FDV-2 VP1 (0.5m above outl.)

VPPF-201 FDV-3 VPPF-301 VP2 (0.5m above outi.)

FDV-4 VPPF-401 VP3 (0.5m above outl.)

FDV-5 VP4 (0.5m above outl.)

VPPF-501 FDV-6 none VP5 (0.5m above out1.)

FDV-7 none VP6 (0.5m above outl.)

VP7 (0.5m above outl.)

FDB-8 WWPF-101 FDB-9 Pool bottom. Centered under VP1 WWPF-102 FDB-10 Pool bottom. Centered under VP2 WWPF-103 FDB-11 Pool bottom. Centered under VP3 WWPF-104 FDB-12 Pool bottom. Centered under VP4 WWPF-105 FDB-13 Pool bottom. Centered under VP5 -

none Pool bottom. Centered under VP6 FDB-14 none Pool bottom. Centered under VP7 FDW-15 none

(, FDW-16 WWPF-202 Wall beside VP1 (3.6m above bott.)

FDW-17 WWPF-302 Wall beside VP2 (3.6m above bott.)

FDW-18 WWPF-402 Wall beside VP3 (3.6m above bott.)

FDW-19 WWPF-502 Shell beside VP3 (3.6m above bott.)

FDW-20 WWPF-602 Shell beside VP4 (3.6m above bott.)

FDW-21 WWPF-702 Wall beside VP4 (3.6m above bott.)

FDW-22 none Wall beside VP7 (3.6m above bott.)

FDW-23 none Wall beside VP6 (3.6m above bott.)

Shell centered between VP1 and VP6 (3.6m above bott.)

These proposed locations are shown on the following sketch.

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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 i) ii) outline of LLNL modified Senso-Metric transducers vent pipe installation assembly 111) wall and floor installation assembly iv) cable splice junction box d) List of supplied parts l

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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 Boilin W. M. Shay, W. G. Brough, and T. B. Miller,1977). gSome WaterofReactor - by 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 4C, p. 1.dimensions of the LLNL modified transducers are shown in Attachment

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ACTUAL SIZE Q;#N[([MK:jQd*fy HIGH RELIABILITY :M@M4W:2MMM ~

GENERAL DESCRIPTION LOW COST. .

. ~- Senso-Metrics SP 65 series economy pressure transducers utilize bulk type high reliability silicon semiconductor strain gages to obtain a high output signal level at a law cost. This soaid state unit is speciScally designed to meet the needs of industrial and commercial Original Equipment Manufacturers, as well as for NO MOVING PARTS uses.

generauabmatmy,evices These rugged have no arts movinewhich may wear or produce errors under conditions of s$ock or vibration. When

  • pressure is ap lied to the diaphragm the low level resulting strain it sensed b e strain gages which respond by a change in their r esistance. e strain gages are bonded directl h dia PsUGG"'O C

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  • b'id "8"'"" " *y to t e* *" " " "ph ram used to excite the bridge,a 8' ' " 8'

- signal voltage across the bridge is developed which is linear and proportional to pressure.

-:- This sensor is designed so that it may be easily mounted in wa!!s of machined housings, pressure vessels, pipes or any place where a flush mounted installation is desired to eliminate clog-ging. Adapters are available so that standard fittings may be

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EASY TO MOUNT REPRESENTED BY:

NOTE:

Higher performances available SENSO METRICS, INCORPORATED PHONE:(213) 988 6070 Other transducers for other 7775 KESTER AVE., VAN NUYS, CALIFORNIA 91405 applientions t .

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MECHANICAL 2.1 PRESSURE RANGE 2.3 OVER 2.4 BURST PRESSURE PRESSURE

  • 015 0 500 X2 X5
  • 0-25 .01000 X2 X5 0-50 0-2000 X2 X5 0 100 0-5000 X2 X5 0-200 0 10000 X2 XM 2.2 Other Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Available from factory 25 Media Compatibility . . . . . . . . . . . . . . . . . . . . . . . . Liquids compatible with 17 4PH Stainless Steel

(- ELECTRICAL 3.1 Input Imp edance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1500 ohms nominal 3.2 Ou tp u t Imped a n ce . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 450 ohms nominal 3.3 Excitatio n . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Volts DC or AC com.

20 vol ts Max.

3.4 Output .................. ....................... 2". full seale open circuit y

- PERFORMANCE OPTIONS SP 65 SP 65B SP 65D SP 65E l / SP 65C )

4.1 Static Error Band (% FS BFSL) .5% c.25% .13% 2.06% e.05%

4.2 Therm. zero Shift (% FSfF.) 2.02 .02 .01 2.01 .005 4.3 Therm. Sen. Shift (% FSrF.) .02 .02 i .01 ) .01 c.005 4.4 Zero Balance ................................ M . 2.0% Full Scale ma.x.

4.5 R es ol u tio n . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I n fi n i te 4.6 Operating Life . . . . . . . . . . . . . . . . . . . . . . . . . . . . undamaged by 3x10' Full Range cycles 4.7 Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . approximately 3 oz. less cable ENVIRONMENTAL 5.1 Temperature Range (compensa'ed) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 to 130'F standard 5.2 Op erating With TFE Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - M to 300'F 5.3 Vibration, shock and acceleration (15 psi range) less for higher ranges . . . . . . . 0.015". Full Scale / g.

5.4 Other Compensated Temperature Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cons ult Factory MOUNTING SUGGESTIONS

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3.b Transducer Installation Plan 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" 0.0. 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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( Item No. to be Spares Assembly No. Description Quantity Installed Included 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 i 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" 1., 9 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 -

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  • Refer to Attachment 4c.

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i4 Modal Tcsting and Analysis cf the JAERI-CRT f acility Reactor Safsty Prcgram Lawrence Livermore National Laboratory I. INTRODUCTION Lawrence Livermore National Laboratory (LLNL). in cooperation with Agbabian Associates (AA), proposes to perform dynamic (modal) testing of the JAERI-CRT watwell. This work will be conducted as part of the continuing U.S. NRC/LLNL Liaison to the CRT program. The results of these tests will be a data base which will provide the modal parameters (frequency, damping, and participation factor) of the wetwell over t1e 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 stiffen.ing to be cosipared to those

>efore.

II. SCOPE OF WORK l In Figure 1 we illustrate the JAERI-CRT wetwell system. Six structural items l

of interest are identified:

4 Outer shell i I, Inner Shell I Wetwell floor plates I ,, Ventpipes I

Diffuser floor .

( Personnel ladder LLNL will contract Agbabian Associates (AA) to assist them in performing the dynamic testing of these structural systems at JAERI.

LLNL/AA will use impulse excitation on the structures and record the resulting vibrational motions on computer magnetic tape. The data tapes will then be processed (by LLNL) using their " qualified" system identification codes to study the major modes between 0 and 150 Hr.

It is proposed that the previously mentioned test be performed with the I wetwell empty, half full and completely full with water. It is also proposed i

that the testing be accomplished in two separate on-site visits, it would be desireable to have the watwell pool pressure transducers active during those tests with water in the wetwell.

Once initial approval is received from JAERI to conduct these tests a more detailed work plan will be developed which will spell out the locations of the transducers and excitation points as well as the type of excitation to be used on the submerged floor plates. <

Acc$l, su vA c/ a vf c.,,. . a . n L/ 3,/g

III. INITIAL TEST SERIES The first visit will consist of detailed measurements on the structural inner wall, the outer wall, and the wetwell floor plates. Exploratory measurements u111 also be made on the diffuser floor, the vent pipes and the personnel ladder. Subtasks inherent in this first test visit include the following, o Unload testing equipment at Tokyo, clear customs, and arrange surface transportation to Tokai Mura o With wetwell drained, place waterproof sensors and establish impact locations on the various structures o Perform first series of test with system empty o Fill wetwell to 3.5m level and repeat series of test o Fill wetwell to normal 7m level and again repeat series of test e Drain wetwell and dismantle test setup, load and transport to Tokyo.

o Clear Customs, pack for shipment to Los Angeles.  :

i During this phase we would request assistance of personnel from JAERI in 1

clearing equipment through customs inspection, arranging transportation of the equipment to the CRT facility and local technician help to assist LLNL/AA with their equipment setup. Also, cooperation will be necessary for the draining and refilling of the watwell before and after the various tests are
performed. The instrumentation equipment will require less than 20 amps at 115 volts; either 50 or 60 Hz will be usable. It is anticipated that JAERI will provide this power if it is not already available.

IV. FINAL TEST SERIES

! The second on-site visit will be made after the structures have been stif fened. During this second visit the same test procedures that were

, performed on the first visit will be repeated. Based on the experience from the first visit, minor test plan revisions may be made. The second test plan will also include any new measurement requirements to provide a more thorough examination of the vent pipes, diffuser floor, and personnel ladder.

Subtasks will consist of:

o Unload testing equipment at Tokyo, clear customs, and arrange surface

! transportation to Tokal Mura.

l o With wetwell drained, place waterproof sensors and establish impact l locations various structures, o Perform first series of test with system empty '

o Fill watwell to 3.5m level and repeat series of test.

o Fill wetwell to 7m level and again repeat series of test i o Drain wetwell and dismantle test setup, load and tranport to Tokyo.

l 0 Clear Customs, pack for shipment to Los Angeles.

I During this phase we would again request assistance of personnel from JAERI in clearing equipment through customs inspection, arranging transportation of the equipment to the CRT facility and local technician help to assist LLNL/AA with their equipment setup. Also, cooperation will be necessary for the draining cnd refilling of the wetwell before and after the various tests are performed.

i i

A

. e V. TESTING CATEGORIES A. The routine testing of the structural systems will include

1. RECIPROCITY MEASUREENTS Linearity of the system can be verified by checking reciprocity. A sufficient survey can be made over the facility by interchanging
  • 1ve points and response points. For linear bilateral systees, the transfer inertence is identical; for nonlinear systems differences will be detected.
2. WETWELL RESPONSE CHARACTERISTICS As previously mentioned, the test will be conducted with the water level dry, 1/2 full and full. The purpose of this is to provide a data set that can be used to evaluate the influence of water on the structural response.
3. TESTING OF SIDE WALLS t The stiff sidewalls of the facility will be briefly surveyed to l confirm that their structural modes are outside the frequency range l of interest.
8. We also feel that the following additional tests would generate data that could be quite useful.

l

1. STRUCT1JRE/ LIQUID INTERACTION - LIQUID DRIVEN This investigation depends upon generating an inpulse. In the water, probably in the vicinity of the lower end of a vent pipe. This impulse could be generated by a small pyrotechnic charge, by chemical reaction by exploding bridge wire rapid release of high v essure gas, The . by collapsing a bellnature

" point source' jar or of bythe a

insulse developed in tie water provides an identifiable driving function to the facility. Depending upon the selection of the sampling frequency and the types of pressure sensors used, a variety of different results can be sought. For instance, liquid borne transmission paths; liquid / structure interactions as a function of source location; and reverberation effects, etc.,

2. EFFECT OF AIR BUBBLE CONTENT IN WETWELL POOL l The LOCA tests exhibit a substantial air content in the wetwell pool which can influence the pool-system frequency. We propose that one test series be conducted in addition to those of A.2 above wherein the water filled pool is precharged with air. As part of this serfes, the local pool sound speed would also be measured.

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