ML20010J191

Evaluation of Silicone Polymers, Final Rept

ML20010J191
Person / Time
Site:	North Anna
Issue date:	06/09/1980
From:	David Williams SRI INTERNATIONAL
To:
Shared Package
ML20010J181	List: ML20010J180 ML20010J189 ML20010J191
References
NUDOCS 8109290688
Download: ML20010J191 (35)

Text

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SOUTHWEST RESE ARCH INSTITUTE POSr OFFICE DR AW ER 20S10 - 4220 CULESR A RO AD

• S AN ANTONIO. TEXAS 79284 * * ($123 484 5111 i

EVALUATION OF SILICONE POLDERS SwRI Project No. 02-5814-118 [

FINAL REPORT l

Prepared for Stone & Webster Engineering Corporation P. O. Box 2325 ~

Boston, Massachucetts 02107

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June 9, 1980 APPROVED:

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,/ A il b Prepared by: II. S. Lindholm, Director David R. Williams . Department of Materials Sciences

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INTRODUCTION i

Three pieces of irradiated silicone polymer were. received at Southwest' i Research Institute (SwRI) from Wyle Laberatories on March 12, 1980. The specimens were packaged in plastic bags contained in lead pigs, which were

! in turn contained in a smaller box within the wooden shipping crate. The package was identified as containing radioactive material. The specimens were weighed and measured upon receipt to provide information for the de-sign of sabots to guide them in the gun tube and for the determination of the gas pressure required to obtain the required velocity of 1500 fps. The i

information given on the labels affixed to the lead pigs is given in Table I, along with the initial and as-tested weights of the specimens and the muzzle 1

j velocities measured for each firing.

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PROCEDURE j The specimens were received in the form of rectangular solid pieces.

In order to fire them from the 1-in. bore diameter cold gas gun, they had to be sanded into smooth blocks and fitted with sabots to guide them down the gun barrel and contain the pressure behind them. The sabots were made -

of low-density urethane foam cast into a 1-in. inside diameter tube with a

. o rectangular block inserted to. form the cavity into which the specimen was placed for firing. Each saboc was cast as one piece, thEn'eut into two side pieces plus a round pusher disk as shown in Figure 1. The projectile was then assembled by placing the specimen between the side pieces and.in-f serting this assembly into the breech end of the gun, which opens at Joint A t

in Figure 2. The pusher disk was then inserted.behind .the specimen.

2 Occasionally, paper shims were inserted betvaen the specimen and side pieces in order to achieve a good seal between the sabot and the gun tube tr. mini-mize the leakage of propellant gas part the projectile.

The gun used to accelerate the specimens uses ce= pressed gas as pro-pellant. A series of reservoirs accumulates the required pressure, and the gun is fired by venting the main reservoir into the gun tube behind the pro-jectile. Two photodiodes are mounted near the muzzle of the gun to detect the passage of the front of the projectile. *he photodiode output signals are fed to a waveform generator for direct display and to a signal condi-tiener which passes a step function to the waveform generator. The four waves are displayed on an oscilloscope. A camera attachment fixture on the oscilloscope allows the waves to be photographed for measurement. The first photodiode also d'etects the turbulent compressed gas which precedes thc pro-( jectile down the barrel, so its output must be interpreted accordingly. The projectile passage is taken to be at the discontinuity in the slope of the output of the first photodiode. The muzzle velocity of the projectile is then calculated by dividing the distance between the photodiodes by the time required for the projectile to travel that distance. Figure 3 shows the os-cilloscope treces obtained for the live speci= ens.

Figure 2 shows the gun and the spe:imen containment structure. Box i is open at both ends and serves to contain the fragments resulting from the stripping of the sabot from the specimen. Box B is the catch box, and con-tains the 34-lb concrete block target. Box B is lined with plastic sheeting and is sealed with a lid secured by four screws. Duct tape is used to seal the lid to the box. A 2-in. diameter aperture is provided for the passage of the projectile, with crossed slits in the plastic liner to allow free

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3 entry of the specimen while containing the resulting debris. The distance from the =u:zle of the gun to the target is 69.5 in. The Specini Operating Procedure required by the SwRI Radiation Hazards Officer is included as an Appendix to this report.

CALIBRATION The gun was calibrated by firing a series of du=my specimens cut from a block of unirradiated naterial supplied by Stone & Webster Engineering Corporation. The calibration firings provided information on the relation-ship between reservoir pressure and muzzle velocity. The required velocity of 1500 fps could only be obtained by exceading the 600 psi rating of the gun, and then only with relatively poor reliability. When attempting to

( achieve a velocity of 1500 fps, the actual velocity fell in a range of 100 fps of the desired value. This limitation is presumed to be caused by variations in the fit of the sabot in the gun' tube, in the leakage of propellant-gas past the sabot, and in the limits of resolution of photo-diodes and associated electronic gear.

TESTING The two live specimens were sanded to fit the sabots, then weighed.

The sabots were also weighed to obtain the net projectile weight. Speci-men A was fired first. The oscilloscope traces are given in Figure 3(a) .

l Several minutes were allowed for the dust to settle inside the catch box i

before the box was opened and the remains of the specimen re=oved,. The i

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4 concrete bloca showed some da= age as a result of the i= pact of the specimen.

A region approximately 1 in. in diamecer was chipped out to a =ax1=um depth of approx 1=ately .13 in. (visual estimate). The fragments of spec 1=en, sabot, and concrete were removed from the box and returned to a plastic specimen bag.

Since the specimen was reduced to a fine powder, and since other debris was also present, no attempt was made to quantify the particle size distribution.

Specimen B was fired next, yzing a fresh face of the target block. The oscilloscope trace is given in Figure 3(b) . Again, the specimen was reduced to a fine powder on impact. The damage to the target block was less severe, with a maximwn penetration of only about .07 in. by visual estimate. The powder was removed from the box to a separate specimen bag, which was placed inside anocher specimen br.g containing a chip removed from this specimen be-fore firing.

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CONCLUSION The fragments from each spec 1=en were collected and placed in plastic i specimen bags =arked with the specimen designation. The bagged specimens 1

1 were then placed in the lead slugs and returned to the SwRI " Hot Lab" for packing prior to shipment back to Wyle Labs. Both sets of frag =ents also contain bits of urethane foam from the sabot and bits or concrete from the l

a target.

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TABLE I SPECIMEN DATA Specimen: A B

! Type: Ch'entrol CT-40-NS Type B' Chemtrol CT-40-NS Type B Exposure:

Time, hr: 545.6 110

• Temperature, 'F: 380 1 20 380 1 20 Power, M-1: - 2 2

• Y radiation, rads: 4.1 x 1010 8.4 x 109

= Isotope: Zn65 Zn65

• 8 rate, mR/hr: 21 195

• Y rate, mR/hr: 18 15 Approximata Initial Weight, g: 12.4 10.7 Approximate Initial Dimensions, mm: 35 x 22 x 10 35 x 22 x 10

Weight as Tested, g

10.00 9.42._____

Projectile Weight, g:

• 16.04 15.49 Hu:zle Velocity, fps: 1450 1410 k

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IICURE 3. OSCILLOSCOPE TRACES OF PHOTODIODE OUTPUTS 1 Division = 100 us I = First photodiode output II = Second Photodiode output III = Conditioned signal from first photodiode IV = Conditioned signal from second photodiode 1 = Projectile at first photodiode 2 = Projectile at second photodiode

APPENDIX r SPECIAL OPERATING PROCEDURE 4

PURPOSE: ,

Because of the hazards involved with radioactive materials, this oper-ating procedure is provided to implement special procedures in support of Project 02-5845-118. This addendum is intended to supplement the SwRi Radio-logical Health and Safety Manual.

HAZARDS:

The tests will involve the firing of two active silicone polymer samples from an air gun at the Ballistics Range. The projectile vill impact on a concrete target within a containment chamber. Methods of containment, pro-tection, and monitoring will be covered in this procedure.

SPECIAL PROCEDURES:

The area to be used for testing will be divided and marked as a con-trolled area with ropes and radiation warning signs.

The projectile will be fired as received. However, should any sizing

(. be necessary it will be done at the " Hot Lab."

The active projectile will be fired into a containment box through a small opening. Within the box, the projectile will Lapact the concrete tar-get. Should any fragmentation of the projectile occur, it will be contained within the box. During removal of the fragments, the operator will be re-quired to wear a respirator, surgical gloves, and a disposable lab coat. After the test, the fragments will be recovered for subsequent measurements in an area approved by the Radiation Safety Officer.

Personnel handling the projectile and fragments will be required to wear TDL badges and surgical gloves. Additionally, pocket dosimeters will be used to monitor " current" dosages.

l All contaminated waste products, such as used gloves and concrete frag-ments, will be disposed of in plastic bags provided by the Radiation Safety Officer. These bags will then be disposed of by the " Hot Lab."

Af ter completion of these tests, the area vill be monitored carefully for contamination. If contesination is indicated, the area vill be cleaned in accordance with the SwRI Radiological Health and Safety Manual.

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. QUALIFICATION TEST REPORT I ON i

NEUTRON SHIELDING MATERIAL FOR CHEMTROL CORPORATION r HOUSTON, TEXAS l

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,__ m-Test Report REPORT NO. 44925-1 WYLE JOB NO. 44925 CUSTOMER P. O. NO. 4087 9 33 PAGEi 0F PAGE REPORT September 10, 1980 U

f DATE SPECIFICATION (S) See Paragraph 5.0

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. 1.0 CUSTOMER Chemtrol Corporation l

ADDRESS 330 North Bel t- East. Houston. Texas 77060 T

2.0 TEST SPECIMEN Neutron Shielding Material Samples

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,s Chemerol Corporation 3.0 MANUFACTURER 4.0

SUMMARY

' Two samples of Neutron Shielding Material were subjected to a Qualification Test Program to verify functional integrity when subjected to the environ-mental tests specified herein.

A description of the Neutron Shielding Material (specimens) is presented in Paragraph 6.0.

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- Alabama Professional Eng. E Dmemant a TEST BY -

i STATE OF ALABAMA **- Re9' No* 7913 l

COUNTY OF MADISON ^

Robert A. Hall , ,,,,, ,,,, ,,..,,, PROJ. ENGINEE _-_

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PAGE NO. II REPORT NO. 44925-1 h.0

SUMMARY

(CONTINUED)

The Qualification Test Program was performed in accordance with References 5.1 and 5.2. The Shielding Material showed no visual physical effects from the Steam impingement Tests. Test results

, _ , are presented in Section i of this report. The test results of the Borated Water Submersion Test are presented in Section Ill.

This Qualification Test Report contains three sections as listed below. The test program was conducted in the sequence indicated ,

.. by the section number.

o Section i Steam impingement Test o Sectioc il Impact Test o Section ill Borated Water Submersion Test

5.0 REFERENCES

5.1 Wyle quotation No. 543/1640-2/ES 5.2 Chemtrol Corporation Purchase Order No. 4087 6.0 TEST ITEM AND EqulPMENT DESCRIPTION 6.1 Test item Description Sample A: 0 CT-40-NS, gamma dose = 4.1 x 10 rads--Sample A is in ene piece approximately 1" x 3/4" x 3/8".

Sample B: CT-40-NS, gamma dose = 8.4 x 10 3 rads--Sample B is in two pieces approximate'ly 1" x 3/4" x 3/8" and 3/4" x 3/4' x 3/8".

6.2 Test Equipment Description

The test equipment used in recording data is shown on instrumentatico l Equipment Sheets located in the appendices of the appropriate sections j of this report.

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PAGE NO. 1-1 REPORT NO. 44925-1 SECTION I STEAM IMPlNGEMENT TEST 1.0 REQUIREMENTS Each of the Neutron Shielding Materials will be subjected to a Steam impingement Test.

The specimens will be exposed to a 600*F s team Jet Impinging directly on the free surface of the samples for 120 seconds.

2.0 PROCEDURES A 1/4-inch fitting for an exit nozzle was located 6 inches from the Shielding Material sample surface. A 1/4-inch line from a high pressure /

temperature steam source, with a valve for regulating the flow, furnished the steam supply to the exit nozzle. A bleed valve was provided upstream l of the flow regulating valve to condition the steam '.i the line prior to starting the impingement. A thermocouple was installed in the steam line, approximately 18 Inches upstream of the exit nozzle,for measuring the steam temperature. The Shielding Material sample was placed flat in i a holding basket located under the exit nozzle, the bleed valve opened to condition the steam, the flow control valve opened and the 600*F steam i, allowed to impinge on the as-molded free surface for 120 seconds.

l f

The specimen weights were recorded prior to and af ter impingement.

i l

s 30 RESULTS The test specimens were subjected to the requirements as specified in Faragraph 1.0 and as described in Paragraph 2.0. No visual degradation was evident. The samples were cracked and discolored to some degree when received. Small powder-like specks of material fell from the specimens whenever handled.

l The weight of eacn specimen prior to and after test is presented in Appendix II, Table 1.

Photographs are presented in Appendix ll. Pho:ographs 1-1 through I-4 are pretest specimens. Photographs I-5 and I-6 show the test setup.

Photographs I-7 through I-10 show the post-test specimens, i , An Instrumentation Equipment Sheet listing the equipment used in this l test is presented in Appendix ll1.

mu umouro==

Huntsvius Facility

PAGE NO. l-3 REPORT NO. 44925-1 9

4 l

g APPENDlX l

, TABLE

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WYt21.Aa04ATostees Huntsville Facstity

PAGE NO. 1-5 TEST REPORT NC. 44925-1

9 e

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APPENDIX 11 I PHOTOGRAPHS

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Page No. I-7 Test Report No. 44925-1

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. Test Report No. 44925-1 ,

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9 PHOTOGRAPH 1-8 POST-STEAM IMPINGEMENT t

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! Page No. 1-15 Test Report No. 44925-1 l 8

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9 O PAGE NO. [-17 TEST REPORT NO. 44125-I 9

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6 6

• APPENDIX lli INSTRUMENTATION EQUIPMENT SHEET O

i i

9 WYLE LABORATORIES Huntsville Factitty

PAGE NO. Il-l TEST REPCRT NO. 44925-1 i

SECTION 11 s-

IMPACT TEST L .

f~ 1.0 REQUIREMENTS i

Ship the Neutron Shielding Material to:

F i

• Southern Research Institute ,

6220 Culebra Road ,

San Antonio, TX 78284 Attent, ion: Mr. David K. Curtice

2. 0 PROCEDURES 1

Upon receipt of* Southern Research Institute's Radioactive Material F License, the specimens were properly prepared and shipped.

• Southern Research ccmpleted the impact Test and returned the specimens to Wyle Laboratories for completion of the test program.

3.0 RESULTS The specimens were received as a powered and granular substance.

• Southwest Research Institute e

k .

WYLE LABORATORIES

• Muntsville Facility J

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PAGE NO. lll-l TEST REPORT NO. 44925-1 9

SECTION lil I^

I BORATED WATER SUBMERSION TEST I

( l.0 REQUIREMENTS g

The Borated Water Submersion Test shall consist of maintaining the j specimens at 150*F for 30 days in a solution of 2000 to 2500 ppm of boron concentration. Solium hydroxide shall be used to adjust the pH between 7.0 and 9.0. Gas samples shall be taken at the 24th and i_ 30th day of exposure and a chromatograph analysis performed to I determine the hydrogen, methane and ethane gas contents.

[ 2.0 PROCEDURES l

The samples of shielding material were placed in separate con-p tainers and filled with the specified borated water to approximately

[

75% of the container volume, the remaining 25% being available for gas evolution sampling. The borated water was mixed 2000 to 2500 ppm boron concentrate sodium hydroxide (NaOH) was added to the solution 7

which produced a room temperature pH of 7.5 Foreign substances were i observed within the solution. Thase substances were removed as requested by the Chemtrol Technical Representative. The containers were sealed and a gas sampling line, containing a hand valve and pressure

'( gauge,was attached. The containers were placed in an environmental chamber and the 150*F temperature was maintained for 30 days.

I Gas samples were taken on the 24th and 30th day of exposure. No pressure deve'lo' ped within"the containers, therefore, the samp-les were removed by evacuating 250 ce sample bottles to 15 inches of mercury.

l, The gas was then drawn into the sample bottles.

\

A gas chromatograph was performed to determine hydrogen, methane and ethane gas contents.

\

3.0 RESULTS

\

The test specimens were. s.sbjected to the requirements as specified in Paragraph 1.0 and as described in Paragraph 2.0. One equipment problem occurred. It is described in Notice of Anomaly No. 1.

i g

l The gas chromatograph was performed by Southern Research Institute, B i rminghc.m, Alabama.

l 1

Notice of Anomaly No. 1 is presented in Appendix 1.

l Humpme Fumn l

PAGE NO. I I I-3 TEST REPORT NO. 44925-1 2

f i

APPENDIX i f

NOTICE OF ANOMALY

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WRE LA50RAMMES Huntsve;te Fac:Hty 1

PAGE NO. IIi-5 TEST REPORT NO. 44925-1 I

l b

I APPENDIX 11 GAS CHROMAT0 GRAPH RESULTS AND f

CERTIFICAT101: LETTER i

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i t

WYLE LABORATORIES Huntsville Facility b

' Pcgs No. Ill-7 Test Rsport No. 44925-1 i

s.

T~ USE OF THIS REPORT AND INFORMATION

t. CONTAINED THEREIN Publicity I

This report and the information contained therein is the property of the' individual or organization named on the face here-of and may be freely distributed in its present form. We do ask, I

I.

however, that no advertising or publicity matter, having or con-taining any reference to Southern Research Institute, shcll be made use of by anyone, unless and until such matter shall have

[- first been submitted to and received the approval in writing of t the Institute. (The Institute does not usually approve any type of endorsement advertising.)

l.

Limitation of Liability r

Southern Research Institute has used its professional axpe-rience and best professional efforts in performing this work.

However, the Institute does not represent, warrant or guarantee

'[ that its research results, or product produced therefrom, are 1'

1 merchantable or satisfactory for any particular purpose, and there are no warranties, express or implied, to such effect. Acceptance, reliance on, or use of such results shall be at the sole risk of l Sponsor. In connection with this work, Southern shall in no event be responsible or liable in contract or in tort for any.special, indirect, incidental or consequential damages, such as, but not i

limited to, loss of product, profits or revenuas, damage or loss from operation or nonoperation of plant, or cirims of customers of Sponsor.

I 1

(

l Report No.: Project 4587, Report 1

(-

SORI-EAS-80-641 l

- To: Wyle Laboratories 7800 Governors Drive West Huntsville, Alabama 35807

t. ,

Date: September 2, 1980 i

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PAGE NO. III-9 j TEST REPORT NO. 44925=1 S

APPENDlX 111 PHOTOGRAPHS I

l WYLE LABORATORIES Huntsville Factilty

Page No, 111-11 Test Report No. 44925-1 i m

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l APPENDIX IV INSTRUMENTATION EQUIPMENT SHEET

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i Huntsville Facility

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