ML20062B017

Application for Renewal of Certificate of Compliance 9007 for Model Ai 520

ML20062B017
Person / Time
Site:	07109007
Issue date:	10/19/1990
From:	Roughan C AMERSHAM CORP.
To:	Macdonald C NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS)
References
NUDOCS 9010230302
Download: ML20062B017 (19)

Text

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I Amersham Corporation ~

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'40 North Avenue Burlington, Masnachusetts 01803 Telephone (617) 272-2000 j

19 October 1990 Mr. Charles'E.-MacDonald, Chief Transportation Branch j

Division of Safeguards and 1

Transportation, NMSS U.S.

Nuclear-Regulatory Commission OWFN, 4E4 Washington, D.C.

20555

Dear Mr. MacDonald:

We request-renewal of USNRC, Certificate.-of Compliance' Number j

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USA /9007/B(U), which'has an expiration-date'of 30. December 1990.-

I have enclosed a revised section 7 on. operating procedures and.a revised Section 8 on maintenance,-which updates earlier informa-tion submitted in our consolidated application dated 16 September 1985.

I have updated the.special form certificate informationlin Sec-=

tion 2, as some of the source assemblies listed in the:consoli,

dated application are obsolete and no longer-manufactured.ySec.

n tion 7 lists the currently manufactured sources models.

As we are.not currently manufacturing'these'. devices, all other manufacturing and fabrication information. remains:as described.in..

the consolidated application dated 16' September 1985'.

I-have enclosed the application fee ofLS15'0;00 to cover this:

renewal request.

If. I can. provide any additional 'information,:

please contact.me.-

1 Sincerely,

$bllblk AI (IlfL i

Cathleen M. Rougnan \\

Radiation Safety Officer

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CMR/bt-Enclosures

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Sham PDR ADOCK 0710 p

l 2.8 SDecial Form The Model AI 520.is designed.to transport source. cap'-

sules.-

These source capsules have:-been certified as

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special form radioactive material under IAEA Certifi-'

-l cate of Competent Authority' Number ' USA /0335/S.

This i

certificate is presented in Section 2.10..

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2.9 Fuel Rods Not applicable.

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2-9' Revision 1 September 1990

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2.10-Anoendix t

IAEA Certificate of Competent Authority USA /0335/S Test Report:

Mcdel AI 520 Hold-down' Arrangement Report: ' Analysis'of Model'AI 520' Tie-down Arrangement t

l-Letter to Mr.

R.

Rawl, U.S.

Department of,Transporta-tion from Mr.

M.

P.

Santoro, Automation.-Industries,-

Dated'4 December 1981, describing-the results of the'.

Model 520 Penetration Reduced Pressure _and Compression Tests.

Automation Industries Test' Report by Mr.

M. '. P1 Santoro,

_ dated 24 July 1973, describing the results of-the Model 520 Free Drop, Puncture'and Thermal ~ Tests.

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l 2-10

. Revision 1 September-1990

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- US Department ce 9.v-ww.=^

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i CWitrupor@m V' d ""TF UC -

hosearch aruf IAEA CERTIFICATE OF CONFETENT ADTBORITY-Speciol Programs SPECIAL FORM RADIO &CTITE Il&TitafALE Msh CERTIFICATE NUMBER USA /0335/S, REVIS10R 2 This certifies-that the source described has been demonstrated to.neet the-regulatory requiyements for special fgra radioactive material' as prescribed 'in

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IAEA Regulations 'and USA regulations. for.the transport of radioactive-

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materials.

'1 1.

Source Descrintion - The' sources' described by.this-certificate'are identified as the Amersham'Model 875. Series source capsule assemblies,- which are single-welded encap'sulations ' constructed iof Type 304 or 304L stainless steel. Th'ey measure eitheri21.5'am (0.85") or 24 mm (0.95") in length and 6.4 mm -(0.25")iin diameter.

Contents may be further contained in stainless steeltor.. titanium-inner secondary encapsulations with springe and spacers.- The flex

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cables for these sources are either.3.8 mm (0.150")i or 4.75 mm-

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(0.187") in diameter.

A drawing of Model 87510 is attached.'

1 2.

Radioactive Contents -- This source consists of not-more than 8.88 l TBq (240 Ci) Iridium 192 as solid me tal, ' 8.14-TBq - (220 Ci)' Cobalt 60 as solid metal, 7.4 TBq- (200' Ci) Ytterbium 1691 as Yb 0,1.11 -

0 23 TBq (30 Ci).' Cesium 137 as CsC1 in a secondary stainless steel ~

2 encapsulation, or 1.85 TBq (50 Ci) Thulium 170. as. Tm2 3..

0 3.

Ereiration Date - This certificate expires December 31,1994.

This certificate is issued in-accordance with? paragraph 803 of the IAEA Regulations and Section 173.476 of Title 49 'of-the Code of Federal -

Regulations, in response to the-November 22, 1989 petition by Amersham' l

Corporation, Burlington, MA, and in consideration of'the associated information therein and on file in this Office.

I Certified by:

}$C ?? o pp

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Michael E. Wangler

'(DATE)'

. 1 Chief, Radioactive Materials Branch Office of Hazardous Materials Transportation Revision 2 - Issued to accommodate minor change in capsule-design and to extend the expiration date.

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1

" Safety Series No. 6. Regulations for the Safe-Transport ofl Radioactive, 1

Materials 1973 Revised Edition" published by the-International-Atomic Energy-Agency (IAEA), Vienna, Austria.

2 Title 49, Code of Federal Regulations, Parts 100 -'199,. USA..

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SECTION 7 AI520 OPERATING PROCEDURES NOTE:

All the precautions used' when making a : radio 7raphic expo-l sure must be observed when loading orfwhen unloading-the package.

1.

A calibrated and operable survey meter must be:used.at all:

times when loading or unloading this package.

2.

Personnel dosimetry must be worn when loading or unloading-the package.

1 3.

For details on the operation-and source changing procedures please refer to the. instruction manual for the device-which can be obtained from Amersham Corporation'.

f TECHNICAL SPECIFICATIONS MODEL AI520-EXPOSURE DEVICE USA /9007/B(U) f USNRC Type B' Certificate

=

Isotope Ir-192

=

Capacity 100 Curies'(+20%).

=-

Authorized. source. assembly

' 8 6 6, 'B-8-A, B-8 -T -

=

Gross Weight

= -40.lbs-(18kg)-

Shielding Depleted Uranium 1

=

27'1bs (12.3 kg)

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7-1 RevisionV1-l September (1990 l:

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7.1 Procedure For Loadina the'Packace'-

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1.

Assure that the-package lisinot damaged except forf superficial marks,or dents.

2.

Assure the source'is' authorized for use'in this:-

I container and is secured.-in the lockedcposition.;

3.

To properly secure the source,-the. locksh'ould be-depressed and-the key. removed.

4.

Install the brass shipping plug over the' source:

a assembly and assure ityis attachedLsecurely.

5.

Install the shipping plug into.;the front: port of

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the camera. securely ~and apply a security. seal with an identification-mark through the 4

and the handle of the camera.

shipping; plug I

6.

Assure all nameplates are. clear ~and: legible.and-contain the following information:.

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i a.

The words " Danger' Radioactive Material"-and:

the trefoil symbol.

b.

The proper shipping' name '(ie.. -Radioactive Material;Special' Form, N.O.S.,-UN2974) c.

Package identification. (ie. ' USA /9'007 /B (U),

Type B(U))

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d.

The radioactive contents.

7.

If the AI520 is to be packaged.inside-~a crate or

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other outer packaging, the outer packaging mustube s

strong enough to withstand =the!normaliconditions i

of trancport and must not-reduce the safety of;the-package.

'The AI520 must:be-placedLwithin the J

l outer package. with : suf ficient blocking.to prevent-shifting'during transportati'on.

NOTE:

When using a-crate or other. outer packaging to

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l ship the AI520, steps.8-14 refer to.:the crate or outer packaging.

7-2'

' Revision 1 September 1990J

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n 8.

Survey the exterior surfaces.of.the package and-assure that the maximum-radiation level does'not~

exceed 200.arem/hr.-

Survey onelmeter.from the exterior surfaces of the package:and assuret that' l

the maximum radiation. level'does-'not exceed 10!

mrem /hr.. Determine the proper shipping-labels'to l

be applied.to the packagefusing.the criteria;of=

table 1.

9.

Properly complete.two shipping' labels 1 indicating'

.I the contents: (iridium-192), the activity,of the-

l source in curies or'nillicuries and the transport index.

.The transport index is the'dimensionless-number (rounded'up to;the first decimal place) expressing the-maximum radiation level (in mrem /hr) measured.at.one_ meter from the' package-surface.

10.

Assure that any'.old shippingLlabels have.been removed.from the. package.

. Apply'two properly-completed-labels to.twoLopposite sides 1offthe package.

11.

Mark the outside of the package with the. proper shipping-name ?.and identification number '_(Radioac-'

tive Material, Special-Form,' n.o.s.,iUN 2974) if

-l not already marked..

Place the' letters RQ next to the proper shipping.name.

12.

If the AI520 is.inside a crate or other outer packaging, mark 1.the outsideipackage "INSIDE PACK-AGE COMPLIES WITH PRESCRIBED SPECIFICATIONS";and

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I list the appropriate DOT specificationinumber orf j

USNRC' Type B number and the!words " TYPE B".

13.

Assure that the? levels of: removable radioactive.

contamination on the outside,surfaceLofithe outer, package do.-notLexceedfo.001; microcurie per 100 square centimeters.

14.

Properly complete the'-shipping; papers, indicating:

.a.

Proper shippingJname'and identificationi number (i. e.. - Radioactive 1 Material, Special

Form, n.o.s.,

UF;2974)..

.I b.

The letters RQ~must appear next to'the' proper;

'l shipping;name when ~. shipping more. than c.10 ;

curies'of Ir-192 or Co-60.

i 7-3 Revision'1-September,:1990.

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Name ' of the radionuclideL (i.e. iridium -192),

d.

. Activity of source-in curiest or. millicuries.,

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a e.

' Category of label-applied (i.e. Radioactive Yellow II).

1 f.

Transport Index.

g.

USNRC. identification, number.or DOT specifica -

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. tion number-;(i.e. USA /9007/B(U))..

h.

For' export. shipments, the IAEA identification i

number (i.e. USA /9007/B(U)).

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Shipper's Certification:

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"This is to certify?that 7 the above named" materials are properly classified,ydescribed, packaged, marked and labeled *and are in proper condition for:-transport accordingLto 4

the applicable regulations of the ~ Department of Transportation."

j.

The shipping papers must' indicate an emergen-cy phone number.. This phoneinumber must have-24 hocr coverage.inEcaseaofaan emergency concerning your shipment.,

The phone number must be clearly' visible'on1the shipping i

paper.

1 k..

For packages conta'ining depleted _ uranium'as shielding material',.'alnotice'must be enclosed in or.on the package, included; w'ith'.the

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packing list: or otherwise; forwarded with the-1 package.

This notice must include the name:

1 of the consignor'or. consignee'and'the state-ment:

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"This package conforms !to the ? conditions and.

limitations ~.specified in 49 CFR173.424 for I

l excepted ' radioactive material,. articles i

1 manufactured:from depleted uranium:UN 2909..

I 15.

Place the package onto the vehicle.using the-handle of the camera.

.I 16.

Properly-brace and' secure the package against l

movement in the' vehicle.

7-4 RevisionE1

-l September /1990 ol j

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i 17.

Assure that-.back of the vehicle is closed.and secured.so that it will not.open.during transport ~

1 NOTE:

1.

For air shipments, the following Shipper's

.l certification may be used:.

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"I hereby certify that:the contents of-the consignment are fully-'and: accurately.,de.

scribed above.by proper. shipping nameLand l

are classified packaged, marked and labeled and are in propericondition-for' carriage.by.

air according.to-applicable national gov- '

ernmental. regulations.'"

2.

'For air shipments, the-package must.be

-labeled with a " CARGO AIRCRAFT ONLY"! label and~the shipping. papers,must state:

THIS SHIPMENT:IS-WITHIN.THE LIMITATIONS PRE-SCRIBED FOR CARGO AIRCRAFT ONLY".

.t 3.

For international' shipments the activity must - be given in: Gigabecquerels : on the : DOT label and --the shipping'. papers. (curies ' X -.37

= Gigabecquerels).-

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l h-7-5 Revision 1 September 1990' t'

7.2' Procedure for'Unloadina the Packace NOTE:

a.

A' radioact'ivet material' package m u's t _. b e :

accepted from the carrier atathe time it is delivered.

b.

If a radioactive material package isEto $el held.at the' carrier's;terminalifor pickup, arrangements must be'made to receive < noti-fication from the carrier of theLarrivalJof' i

the package at-the? time of arrival.

The-packageJmust be.pickedo up-expeditiously upon receipt'_of: notification (within i three hours if practicable).

1.

Upon. receipt of a package'of radioactive material,-

J survey the exterior surfaces'offthe package and' assure that the maximum. radiation level does'not exceed 200 mrem /hr.

Survey-'three feet from the L

exterior. surfaces of the packages and assure-.that the maximum radi^ation11evel)does.not exceed?10-mrem /hr.

If either of thes'e_ limits are exceeded,-

notify the Radiation Safety-Officer immediately.

1 Record the maximum radiation: levels measured at the package surface and at three feetEfrom the package surface on the Receiving--Report.-

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2.

If the package containssradioactive; materia'l which t

is not in special' form =m'ake a contamination 1 wipe 4

a d

test.of the exteriorLsurface of_the' package'.. : Wipe' a representative surface-of the package,: covering-an area of approximately 100jsquare-centimeters',

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using a cloth patch and moderateipressure.< ~. Meas -

ure the activity of the patch using;the contamina'-

tion monitor and assure thatlthe activity does'not-exceed 0.01 microcurie.-

If thisi.limitLis exceed-ed, notify the Radiation Safety Officer immediate-L ly.

Record thelresults ofLthis-contamination wipe-test on the Receiving' Report.,

NOTE:

If any'of these,limitsfare' exceeded,.the Radia-'

- l tion Safety Officer shalli;1mmediately notify;the'

'l USNRC and.the final'deliveringicarrier.

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7-6 Revision-11 l

September 1990!

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R 3.

Inspect the package'for,any evidence of physical.

damage..

Record the results of thiscinspection-on the Receiving Report.

Also~ record on.the Receiv '

c ing-Report the; source model number, sou' ice serial i

number, radionuclide, ' activity, transport package model-number and package strial numbc.5 Forward:a 1

copy of the' completed Receiving 1Peport to"the Radiation, Safety Officer.

4.

Assure that the packageJis? locked,'oriplace':the~

package into'an outer 7 locked' container.i Placeithe' package into the Radioactive Material' Storage Room and lock the door.to the room.

5.

Keep-a' copy of thelOperations' Manualfor'the package--on. file - to-assure.-you Lhave-the! proper opening-instructions.

6.

To properly open"and..use-the' package,.as a radio.-

graphic' source changer:: refer.to.theidetailed instruction-manual:forithis> device.

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-Revision l' R

September 1990

i i 7.3 Procedure for Prenaration of an Emotv' Packaae' for' Transport y

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1.

For shipment of an empty Model AI520 exposure device, first-assure the camera.does not contain~-

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an unauthorized source or cropped source'byLper-I forming _ a-physical verification using the follow-ing procedure.

I a.

Remove the' shipping plug from.the$ front of; the camera-andl connect up the; controls.

-b.-

Crank' the, drive cable -' through = the = S-tube ~ of d

the camera while observing the' survey meter:

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at the front of the camera.1

- i, NOTE:

If radiation levels increase or an obstruc-

' tion.is. felt, immediately discontinue the i

test-and secure =the= device., Contact'. Amer-3 sham Corp' oration for further instructions.-

9 c.

The drive cable should pass. thi ough the -

entire: length.of the S-tube and emergeigfrom-1 the front of the camera, i

d.

7.t the-conclusion-of the test, disconnect the

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controls-insert both shipping pluses'and.

j attach an EMPTY tag.

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l 2.

If.the. shipping package 71s to be'pl' aced linside a-4 crate or other outer packaging, the.outerbpackag.

ing must be strong enough'to1 withstand the normal-conditions of transport;and must.not reduce the 4

safety'of the package.,

The shipping package ' must:

be placed within the outer package with sufficient' blocking to prevent shifting 1during!transporta-tion.

NOTE:

When using a crate or.other'outerLpackaging~to'-

ship the AI520, steps 3-4'r'efer'to the crateJor outer packaging.

3.

Assure that the levels of-removable ~ rad'ioac61ve 1

contamination on.the.outside surface of theiouter-package do not exceed 0.001 microcuries~per 100 square centimeters.

q 7-8 RevisionL1 September 1990I cm T

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Survey the package at the surface'and at one me.ter 4.

from the surface to determine the proper; shipping j

labels to be applied to package.

t a.

If the. surface.radiat[on level-does. not-exceed 0.5 arem/hr and there is no. measurable-radiation level at'one meter from the sur-face, no label is required..-Mark the outside' d

of the packageLwith the proper shipping-name 1

and; identification number (Radioactive Mate-f rial, Articles. Manuf actured from ' depleted' l

Uranium,?UN 2909) and.the statement *'

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" EXEMPT-FROM SPECIFICATION PACKAGING. SHIPPING.

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PAPER AND-CERTIFICATION, MARKING AND LABELING-d AND' EXEMPT FROM.THE' REQUIREMENTS: OF:49CFR-

-i part1175 PER CFR173.'421-l'AND 49:CFR173.424".

NOTE: -This does not exempt the, shipment;fromfthe' l

reporting' requirements!11sted inf49 CFR--

1 parts'171-177 pertaining to the-reporting-of'the contamination or other radiation ~

'q incidents, j

Additionally, a notice. must be enclosed: in-or on the package,-. included.with the packing list or otherwise1 forwarded with:the package.-

1 The notice must--include:theEname,of the consignor.or consignee and the statement * '

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"This package conforms.to the conditions and.

limitations specified Ein J4 9CFR173.424 ; for.

Exempted Radioactive : Material,-. lManuf actured.

from Depleted ~ Uranium,'UN 2909".

~b.

If the surface radiation level ' exceeds 0.5' mrem /hr, or if~there'is aimeasurable.

radiation level at'onermeter.from the sur '

face, use the criteria ^of table'1.'in section 7.1 to-determine;the properfshipping_ labels.

J to be applied to'the package with the;. proper shipping name and identification; number (RadioactiveLMaterial, LSA, n. o. s.,: _UN 2912).

If the container-is packaged'insideia crate j

or other outer = packaging,Lmark1the package with the statement "INSIDE PACKAGE COMPLIES-WITH PRESCRIBED SPECIFICATIONS"..

I Properly complete the shipping papers, asLlisted in section'7.1.

The isotope is'U-238 and'approxi-

-i mately 5 mil 11 curies.

1 7-9 Revisionni September:1990 0,.

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TABLE 1 Haximum Radiation Level at Surface at One Meter i

Radioactive White I N

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0.5 mR/hr None AD10AtilVE I F

\\7 Radioactive Yellow II l

50 mR/hr 1.0 mR/hr

'NgDIOACTIVE lgi

' fd / '

Radioactive Yellow III l

/

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200 mR/hr-10 mR/hr RADIDACilVE Il/l LJ

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7-10 Revision l' September 1990

1 SECTION 8t AI520 ACCEPTMICE TESTS AND MAINTrarkMCE PROGPhu l

8.1 Accentance Tests l

8.1.1 Visual Insoection The package is visually inspected to assure:

1.

It was constructed properly in accordance with drawing number A152090.

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2.

The labels are inspected to assure they contain the required information as referenced in Section 7.

's The safety wires are installed through the ship-ping plug.

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source assembly used in this device is visually 1.spected to assure proper closure of the weld, to ysintain primary containment.

It is also inspected for proper length to assure it locks in the required stor-age position.

8.1.2 Structural and Pressure Tests The swage coupling between.the source capsule and cable is subjected to a static tensile test with a load of 100 pounds.

Failure of this test will prevent the l

source assembly from being used.

8.1.3 Lg,ak Tests l

The radiesctive source capsule '(the primary contain-ment) ist wipe tested for leakage of radioactive contam-l ination.

The source capsule is subjected to a vacuum bubble leak test.

The capsule is then' subjected to a 4

second wipe test for leakage of radioactive contamina-tion.

The contamination must be less than 0.005 micro-curies.

Failure of-any of these tests'will prevent use l

of this source assembly.

The package is wipe tested on the exterior surface prior to its first shipment in accordancewith10CFR71.g7.

(If this wipe test exceeds 0.001 microcuries/100 cm it will not be shipped.)

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8-1 Revision 1; September 1990' I

F 8.1.4 Component Tests The lock assembly of the package is tested to assure that securiprevent use of. the package until the lock assembly is corrected and ratested. The brass outlet plugs are installed'and checked to assure they are attached securely to the device.

Failure of the test will present use of the package until the failure is corrected and retested.

8.1.5 Tests for Shieldina Intearity i

The radiation levels at the surface of the package and at one meter from the surface are measured using a

small detector survey instrument ( e. g. ', AN/PDR-27).

These radiation levels, when extrapolated to the rated capacity of the package must not exceed 200 millir-oentgens per hour at the surface'nor ten milliroentgens per hour one meter from the surface of the package.

FailWe of this test will prevent use' of the package.

8.1.6 Thermal Accettance Tests Not applicable, j

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8-2' Revision l' Septemb0r 1990.

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8.2 Faintenance Prouram 8.2.1 Structural and Pressure Tests Not applicable.

8.2.2 Leak Tests As described in section 8.1.3, the radioactive source assembly is leak tested at manufacture.

Additionally, the source assembly is wipe tested for 3eakage of radioactive contamination every six months.

8.2.3 Subsystem Maintenance The lockbox assembly is tested as. described in section 8.1.4 prior to each use of the package.

Addit.ionally,-

the package is inspected for tightness of fasteners, proper seal wires, and general condition before each.

use.

6.2.4 Valves, Ruoture Discs, and Gaskets-Not applicable.

8.2.5 Shieldina Prior to each use, a radiation survey of the package is made to assure that the radiation levels do not exceed 200 milliroentgens per hour at the surface nor 10

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milliroentgens per hour at one meter from the surface.

8.2.6 Thermal-Not applicable.

8.2.7 Miscellaneous Inspections and tests designed for. secondary users of this. package under the general license provisions of 10 CFR 71.12 (b) are included in Appendix A.of section 8.

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I i-l 8-3 Revision 1 September 1990

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APPENDIX A Maintenance It is required by 10CFR 34.28 that inspection and maintenance of the Model AI 520 control unit and the exposure device be per-formed at intervals not to exceed three months.

A:

Control Unit and Source Guide Tubes 1.

Disconnect the cons;vl unit from the expocure' device.

2.

Inspect the entire length of each control hose to-assure that each section is free from cuts.and damage.

3.

Inspect the end fittings to assure that they are tightly connected.

Check the threads on the. fittings for damage.

t 4.

To remove the drive cable, turn the hand crank of the control unit in the expose. direction.

The emergent cable should be cranked into a bucket or other contain-er to keep it clean.

5.

If the crank will no longer turn a stop spring.has been L

put on the drive cable.

This must be removed before the drive cable can be completely withdrawn fromL the crank.

6.

Clean the drive cable with chlorothene and flush the control housing and the source guide tubes.

7.

Thoroughly dry the drive cable,. control housing, and the source guide tube.

Any remaining solvent can cause permanent damage.

8.

Check the source guide tubes for binding by holding them vertical and dropping a dummy source through them.

9.

Wipe the source guide tubes and control housings with a cloth soaked in chlorothene and flex them to check for internal damage.

10.

If the control housings or guide. tubes are cut or flattened they should be repaired or replaced.

11.

The guide tubes or control housings may be covered with tape where only the outer plastic is cut through.

12.

Check for excessive wear on the connector.

13.

Lightly grease the drive cable with Texaco Unitemp-

grease, a

8-4 Revision 1-September 1990

_ ~..,,,.

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Exposure Device 1.

Survey the entire circumference of the device to assure that the radiation levels do not exceed 200 milliroent-gens per hour at the surface or 10 milliroentgens per hour at three feet from the surface.

2.

To perform maintenance-on the exposure device, the source assembly must be removed and placed in a. source changer following the appropriate operating instruc-tions for the source changer.

3.

When the exposure device is empty, a tube wipe should be performed to check for contamination.

To clean the

'S' tube run a cloth soaked in chlorothene through it several times.

Dry the

'S' tube by running a dry cloth

_through the tube.

4.

The lock assembly should be removed and cleaned in chlorothene.

Inspect all parts for excessive wear or damage and replace if necessary.

Lightly grease all moving parts at their contact surfaces with Texaco Unitemp grease.

5.

Assure that the two female threaded fittings _on the exposure device are free of any dirt or sludge buildup.

~)

These should be cleaned with chlorothene.and then' allowed to dry.

6.

Assure that the brass plugs (dust covers) are free of any dirt or sludge buildup.

These should also be cleaned with chlorothene and then allowed to dry.

7.

Inspect the carrying handle for damage or, excessive l

wear and replace if necessary.

If the handle has become worn or started to tear it should be replaced.

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i 8-5 Revision 1.'

September 1990 l