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L25 14 13
MICROCOPY RESOLUTION TEST CHART
NAPIONAL BUREAU OF STANDARDS – 1963
ois
**--.code.ms-S
--
---
.
.
-
---
This paper was submitted for publication
in the open literature at least 6 months
prior to the issuance date of this Micro-
card. Since the U.S.A.E.C. has no evi-
dence that it has been published, the pa-
per is being distributed in Microcard
form as a preprint.
ena bora
- c


.
LEGAL NOTICE
This report was prepared as an account of
Government sponsored work. Neither the
United States, nor the Commission, nor any
person acting on behalf of the Commission:
A. Makes any warranty or representa- :
tion, expressed or implied, with respect to
the accuracy, completeness, or usefulness
of the information contained in this report,
or that the use of any information, appa-
ratus, method, or process disclosed in this
report may not infringe privately owned
rights; or
B. Assumes any liabilities with respect
.
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the use of any information, apparatus,
method, or process disclosed in this report.
| As used in the above, “person acting on
behalf of the Commission” includes any em-
ployee or contractor of the Commission, or
employee of such contractor, to the extent
that such employee or contractor of the
Commission, or employee of such contractor
prepares, disseminates, or provides access
to, any information pursuant to his employ-|
ment or contract with the Commission, or
his employment with such contractor.
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E. M. King
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MASTER
NOT FOR Antento ANASUFICIAIS
DISTATOS TE TILAUKSEN recome
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won iwwritt ORDURES CONFITE M

DEMOUNTING AND MACHINING IN HOT CELLS.
JAN C, ipos
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The collection of useful information in the field of atomic energy

.
-.
.
.
APPROVED FOR PUBLIC RELEASE
.
-
-
•
•
.
..
.
frequently requires the remote handling of highly radioactive items.
Fuel elements, control rods and structural elements from operating
and
reactors must be examined in case of failure/as a means to determine 11fetime
under previous conditions and conditions to be imposed; these examinations'
usually require ecue amount of dismantling to obtain a section for test.
The development of new fuels, control rods and structural elements and tests
to determine more fundamental properties of material under conditions
existing in nuclear reactors usually require small samples that are
contained in housings designed to maintain various temperature, pressure,
stress and other conditions during irradiation; post-irradiation exami.
nation requires the removjl of the specimen from its housing and oubo
sequent sectioning of the specimen.
A list of the types of experiments we have recently disassembled
and examined in the physical testing hot cells at Oak Ridge National
Laboratory follows: .
“1. Plate-type fuel elements such as APPR and ORR.
2. Experimental capsules from the ORR, LITR, ETR, MIR, or other..
These contain experimental fuels such as vozi (Th,U)C2, molten
salt fuel and miniature fuel plates; or other materials such
as Beo, Algºg, or Mgo pellets. The capoules range in size
from about 1/4 in. to 3 in. in'dian and 6 in. 'to 25.in. long,
..
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deaboond this toport may it tastry
LEGAL NOTICE -
mom who had a
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lege or out
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A. Mae
where, w
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This paper was submitted for pubucation
in the open literature at loast Jaonths
prior to the issuance date of this Micro-
card. Since the 1.8.A.E.C. has no evi-
dence that it has been published, the pa-
per is being distributed in Microcard
form as a proprint.
...
..
3. "Poolside" irradiation boxes (up to 20 in. x 30 in. x 4 in.) from
.
the ORR which primarily contain tensile, cube burst, and impact
...........
specimens of structural materials.
...
..
.
Loop experiments such as the ORR-GCR Loop # 2 And the ORR-Army
pressurized water loop. The Loop # 2 experiment as received
at the hot celle de normally about 5 in. In diam and 11 ft
long; provisions have been made at the cells to receive the
.
..
..
experiment with its shielding plug if necessary and this in
:
..
about 18 in. in diam and 15 ft long.
The equipment necessary for demounting 18 in general the safe that
...
would be used if it were possible to do it in a conventional manners
.
.
.
..
though there is a nutable shift to power tools, especially for saving.
lland tools are almost always used to some extent for prying, probing,
holding, twisting, etc. The tools most often adapted to be held by
master slave and the heavier duty electric manipulators are: diagonals;
...:-.-
.
e n
.wire
-.q.mar
allen wrenches; socket wrenches; box, open-end, adjustable and pipe
. w
:
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.
ne
-"ovo. m...........
. .
-: •.. .-..
..
.
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....... ...... ...
m...vr.no ..................omn..wameone...
:.'...... . .. ... . .
wrenches; screwdriver; banmers; tweezers. Other equipment that we usa...
regularly include:
:: 1. Shears • three shears are in common use; one for pipe up to .2
2 in. in dian, one for pipe up to 4 in. in diam, one small
plate-type shear.
2, Saws - hacksaw, bandsaw, skill saw, and guillotine saw,
3. Abrasive slltters - Capsule slitter, metallographic sample
cut-off saw, a small saw with thin blade for this sample:
. ......
. sohor don'.-
..
*--.micos ....
.
.
...
......
.....":
..
preparation.
..
3.....
. .
.......-..
...
Milling machines - a modified Bridgeport, and a special unit
built ry Cincinnati Milling Machine Company. ;
shine Company. ...........
:'--
-.-..
-
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-..--
.
.
..
..!
.
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:
5. Gas sampling equipment - drill or needls for puncturing and gas
collection system.
6. Miscellaneous itens such as cubing cutter, pipe cutter, mechanical
aprealers, lathes, etc.
The conditions needed for the proper use of tools in hoc cells :
lucludo good violbility; this can be achieved by the use of windows,
telescopes, mirrors, and periscopes with a good general level of
lumination and the use of spot lights. The ability to hear lo especially
valuable for mill and lathe operations. Good manipulative ability is .
helpful, especially it there is a senoitive fuel feedback us in the
Model 8 master-slave manipulator.
A general observation on the development of equipment over several
yaars is that carefully selected low cost commercially available tools,
that can be modified for hot cell use easily, are usually best buys.
Other poiats in choosing equipment are: 1c is more than adequate to do
the same job outsi'e the cell, the major controls are easily accessible
to a master-slave manipulator or there is room for mounting a more than
.
.
adequate motor and drive system.
(The master-slave is good for some
.
•-
•-••..
handle turning if a sufficient torque arn de provided, but this action
gets old fast; so for much turning a motor 1o pre farred.) For example, ::
we use a small bandsaw modified as shown in photograph No. Li it io .
remounted on a low stand, the blade guards are removed, plates are
added to the vise, and the blade tension adjustment extended for :
easy gripping by the master-alave manipulator; iso, the power switch ::.
16 removed and the saw is turned on and off remotely. Also, á miller:
has byen nodifled us seen in photograph No. 2. It comes with a ::
--.-..
:.
.
••.
:
•.
-.
.
longitudinal drive; we added a similar drive to the cross-feed, and
experience has shown that a vertical drive would have been useful.
•
...
... .....
.
.
. .u
a
Wheed S..
A spindle speed changer was added and found useful, but colt changing
should have been given more weight in design. Modification of other
controls consisted of extending, outs to help keep hand tools on
(especially ratchet wreaches), extending handles on the table travel
controls, and grooving handles on other controls for gripping by the
master-slava manipulatori.
Our milling machine bulle by the Ciucinnati Milling Machine Compray
10 a special unic built for use in the High-Radiation-Lovel Exanlaation
Laboratory. The mill was operaced extensively prior to installing 10
the hot calls, but hno not been put into actual hot operation yot;
paotograph No. 3 sblm it in final stage of installation in the calls.
It has a 40-10. long scacionsry bed with provisions for subaorged cutting.
Set-up of the work is done with muster-slave and GM Habipulators, and
cutting 18 controlled from a panel outside the cells.
The way in which our equipment is used to disassemble experimento
can best be described by following some experiments through the staps .
of disassembly. For example, the steps' in disusschly of an ORR capsule
containing vo, fuel and jacketed with a compartment contalaing Nak follows
1. After removal from the reactor, the facility cube 1. pulled up ..
out of the water at poolside until the specimen and cube can be cut :
less than 9 ft long and the tube to cut off with a pipe cutter.
Radiation levels of 200 to 300 m/hr are not exceeded; 18 .
necessary from a radiation standpoint this tube cutting so dove ".
in the hot cell.
:'. 2. A ayion cord is attached to the end of the cut tube and the
experiment de pulled directly from the pool into the hot coll, .
which is located over the pool...
.
:
.
.........:
.
..
................
:
:
•
wered
we .: : .
.
3. Tiia uawanted tube above tho experimental capoule to cut off
using a 2 10. pipe shoar, nee photograph No. 1. The hydraulic
pump for the shear is located outside the calls. .
4.
The capoule to hold in a vertical position and the and saved
off with a backsaw, photograph No. 5. The cut 16 located to
slice late the Nuit dulled space but not luto che inner capsule
containing the vo, fuel.
The Nak 1. poured into a container for disposal, and the space
filled with an oil-clcohol nixture to reace any ruldual Nak.
The ofl lo chaa vasdad away with alcohol and the laner capsule
contd ning the fuel 1. sitpped out of the slenmes; all except
the laner capsule la discarded as scrap.
6. Tha ondo of the capsule are cut off with an abrasive slitter,
photograph #o. 6.
7. The capsule lo then slit (photograph No. 2) twico, 180° apart,
and one side 11fead off. The capsule may be impregnated with
epoxy prior to elicting 18 it to anticipated that the fuel L.
badly broken and it is desired that it raia la place after ·
.
.
opening.
.8. Samples for metallography, chemical analysis, or other tasto
ara obtained by sectioning with an abrasive wheel (photograph No.2)
8.
which may be used for wet or dry cutting. "!.
..
.
9. An additional scep is used in opening, the capoules where it is
.. .extremely important to obtain the specimens inside with no
damage. The jacket of the capoule to not elit completely through
10 step 7, 1.6. about 0.015 '1o. of the jacket thickness to left
uncut; • profile of the capsule to nodo prior to slicting to assure ·
m ent::ose
antevern
..
Kombinir
become.
-6
1
the jackat do not cut through. The capsule to then put
in a aprender and the jacket cracked Opon as skinn la
phacograph No. 2
Disassembly of a piece type fuoi clement to accomplished by:
1. Cuscing off the end boxes with a bandean, sos photograph No.dhe
2. The side places of the element era slit using a call willing
machino, se photograpb No. LL.
3. Seleccet araas of interart for netailographic or chemical analysia
are cut from the separated places with a smil sheer, m.
photograph No. 12 .
4. Muallographic samples are cut from the areas of Sateross
using the ver abzasive saw showa to photograph No.
Specineas aro recovered from a poollde irradiation box (up to
aboast 20 lv. x 30 in. x 4 in.) u
follow:
3.
de the facility cube to cut off. at poolside and the Irradiation
box to pulled into the coll no described for the capsules.
2. The alualaun Irradiation box is cut opon with skill sen
nounced in a omall-low cable as abowa ia photograph No 12.
Afcar removal frou the Irradiation box too sooibly hr* "75 the
tensile, impact, subu-burst, or other specimens lo riken
apart using small hand tools. :
Loop expor loents such as the .ORR-GCR Loop # 2 (opecimen about s da..
in dian by 15 ft long) are moved to a coll with. largar equipment for
segmenting. Photograph No.Lt shows specimen being out with a
guillotini sev.
A hydraulic shear which will cus schedule 40 pipe up to 4 da. 10
dion to available. Photograpto 10.5 shows 16 la um in a bot coll
cutting up scrap from rouctur experiments for disposal to the burial
ground.
PHOTOGRAPHS
....
.
. .
.
Photo No.
1. Small Bandsaw Modified for Remota Operation (RM 3358)
2. Bridgeport Mulling Machine Modified for Remote Operacion (CRNZ 52999)
3. Cincinnati Milling Machine as Instuiled in HRLEL (HCO 1441)
R21967
Ivo-lach Pipe Shear Cutting Pacility Tube from Bxperiment la ORR Hot Call (not included)
s. Nesknew Cutting End Off Capoula Hold in Vercioal Postelon notar en contacted).
6. Capsule sliccer Cutting Bisd Off Capsule í R 14665)
1. Capsule 811tter slitting Capsule ( 19722)
8. Metallographic Cut-off saw for Wet or Dry Abrasive Cutting (R-21127)
9. Spreader Used to Break Opeu Capaule When Jacket Is Not Cut Through (R 15279)
10. Bandsaw Cutcing End Boxes Off Plata-type Fuel Blewent (R 6611)
11. Cutting of 35619 Places with Milling Machine to separate. Platas of Pluce-type
Fuel Elenal (& 6742)
12. Smuul Sheer Cutting Place fron Plate-type Puel Blement (not included)
Using
13. Opening of a Poolaida Irradiation Box/a Skill Saw Mounted In i Low Table (20060)
14. Seccioning of AD ORA-GCR Loop with a Guillocima Sam (HCO 1535)
15. Your-inch Hydraullo shoar Cutting Radioactive Scrap in ORR Hot Call for
Disposal (8 12676)
......
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CONTAMINATION
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END
..
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A
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DATE FILMED
9/9/65




Berlin on
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