ML20133L578
| ML20133L578 | |
| Person / Time | |
|---|---|
| Site: | 07000036 |
| Issue date: | 12/10/1958 |
| From: | Leaders W MALLINCKRODT, INC. |
| To: | Johnson L US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20133G976 | List:
|
| References | |
| FOIA-96-343 NUDOCS 9701220068 | |
| Download: ML20133L578 (4) | |
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Mr. Lyall Johnson Licensing Division U. S. Atoraic Eborgy Cocasiaaion j
Washington 25i, D. c.
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SUBJECT:
Special Nuclear Materials License No. ShW33 l
Dear Mr. Johnsons m114n%t Qbemical Works has erected a new bu41Mng at the Hematite, Missouri special nualmar material processing plant to house a production facility for We are giving below (1) a general descrip-pellating enriched uranitas dioxide.
tien of the process (2) specific details for radiation and dust control, and (3) provisions for radiation monitoring as specified under 10 CFR Part 71.
i General Description of the Process spooitto steps in the manufacture of pellets will be as follows:
1.
Addition of binder and lubricant to DO powder.
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Granulation 4
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- e ma Ua oro r; plying for extencion m.' on 3333 liannco to cover tho oporat, ions of j
this plant in accordanco with the p*ocedurca to bo dancribed for urcuiwa enriched in tho icotopo UW up to end including $1 k rarenza tc "limitad sofo" batch sicca would, in all cacou, ueen thoaa quantitian 11abd in Tablo H1I V p10]g hrt ha Polcted, for the anaay in quaatica, he first throo prococs atops of blonding, granulation, and dryins are ccrried out in a singlo dust hood to insuro poaitivo isolatica of any dust from the j
operatora and from the main production aron. Tno blender, granulator, and ciry-1 ing oven are sopcrated from acch other by not loca than two foot odgo to edge to insure ccc:plete isolation of " limited anfo" batchon which may be in the throo piccos of equipront. A singlo drum containing a "linitod safe" batch will be introduccd into the hooded croa. Tho drum will be emptied into a mixing bcul by a special drun invorter completely onclosed in tho hood. The necessary bindera and lubricants will be added and rachanically blonded into tho batch of oxide.
The entire mixing bowl will then be transferred within the hood to a commercial granulator to develop the proper particle cito. Hatcrial will fall directly from the granulator onto trays and will be transferred manually to the drying We trays will be inserted into the drying oven on a batch basia. Bo oven.
entire hood system is exhausted to the atmosphere through two HSA type filters for positivo removal of airborno dust to prevent contamination of the building roof and the environs.
' Following completion of the drying cperation, a singlo batch of trays will be unloaded into a drum, a samplo taken far testing. After the lid is placed upon-the drum, it will be removed from the hood and placed in a storage rack. Jhe stcrage rack is constructed so that the drums are separated two feet edge to sFge and a veitical spacing of two foot top to bottom maintained at all tJiss.
his is identical to the racks descr:. bed and licensed in our other operations.
The rack is constructed of steel angle iron. (See application dated February h, L1958.)
When tests show that powders are acceptable, a single drum will be removed from e storage rack, pieced in a dust hood and pneumatically transferred to a
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Age h0 Door on top of the pellating press. This hopper is equipped with a wag valve and press feed will be discharged as mquired into a feed hopper on the 4
p he feed hopper attached to the press mechanism is_10" I D.
Since the 2
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- press, press feed at this point has been shown to have a mnv4== density of 3 0 g/ce, the 10" diameter hopper attached to the press is safe geometry.acoceding to Table XY.of 5-1019. Part h. De3eted. for assays up to and including 5% Usae.
Se pellet $ng pmas and all associated,==ahan4=== are enclosed in a dust hood which is.ezhamsted through MSA type filters to' positively remove airbsene i
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contamination.
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Following pressing, the pellats an autammMaany discharged feca the 3ress and fed to a continuous belt which passes through the pre-sintering furnaco. So hearth opening in the furnace is h" high by 1h" wide which, according to Table 6IIII'of.Mnto.- ParthDeletedgis a_ safe alab WaL-se fcr, assays Mp to and. M 4
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M M fcoau prohiaca. Sta h vth cnd Iwree afford nuclear control frca a cc - G eb acanid mRici.
Ua niach.ry, a;u of du crNiuscricd lurnaco aclivara the pcilota continucus-ly into a aoWed encloauro rhore the pcHeto src loeded onto trays for trcnsfot-to the high ^,onpurnturo aiutering oporation. Tho pre-sintering and hich temper-aburo sintering furancos operato on a continucua basis. To maintain =nooth operation, transfer of pellots frca the pro-sintoring to the high temporntura ~
sintering furnacos muut bc accompliahad owry hour. Wo accuculation, thereforo, is a "linited unfo" batch for up to 5% h0 pounds of U0 a.. This quantity of UO at the transfer nood will never oxccod a
2 cascy.
In the ovent the pro-sintering furncee or tha sintering furnccca necd to be cocplotoly emptied, provisien hc3 beon mcdc to atoro the pollots temporarily in layers not to exceed two inches in i
dopth with tuo foot spccing between layers. This would only occur under omera
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goney conditions such as furnaco repair, pcuor failuros, etc.
Tho tray loading hoed is exhausted to the atmosphere through MSA typo filters to positively olininato airborno dust.
Four high temperature sintering furnaces will be installed.
The hearth hei;;bt is four inchos. Sinco the trcys which carry the pellets through this furnnce have a dbnsion of 2" x 5" x 7", and aro loaded to a maximum of nine pounfo of UOg penota por tray, the uranium density in each tray is 3.1 g/cc over the tray voluno.
On this basis, tho hearth height of four inchos is within the safo slab dimension given in XIII of K-1019, Part h, Deleted, for material up ta and including 5% assay.
The trays will be periodically discharged from the cooling end of the high temperature sintering furnaces and will be manually placed on a transfer cart and moved to a gauging station. At the gauging station the oper.
ator win transfer one tray at a time into the feed mechanism of the gauging machine. This mechanism will orient the pellets and pass them automatically to I
the gauging machine whero they win be sized into acceptable, undersize, and oversize penets. The undersize penets win be conected bstch-wise and re-turned to scrap recovery operations in our currently licensed facility. Se acceptable pelasts will be conected in a " limited safe" batch or less and transferred directly to the tube loading station. Oversize penets win be collected in a " limited safe" batch'or less and transferred to a centerless grinding station.
he centerlssa grinder is housed in a dust enclosure which is exhausted through MSA type filters to positively remove airborne ' contamination.
Feuets from the grinder will be conected as a " limited safe" batch ce less and transferred to the tube loading station. De coolant and lubricating solution used for the contarlass grinder is conti-a%v discharged from the machine to a filtering unit. Se filtering is acc==14ahad by gravity flow through an automatic paper filter. Se depth of the liquid on the futer is controned by a float valve and will be limited to 1 to 2 inches for efficient operati<m maintaining a safe slab dimension for the assay of uranium in question. The coolant solution 4
with the uranium and grinding compound zomoved is recirculated.to the;mmahh4 he contarless' grindet and the filter have been especially, designed fer. nuclear.
applications with the external filter provided-to presnt/acouaulation afk -
uranium-bearing sludges.
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shich is a:anunted to % uhuou;:r.ru thrau e,h fuA typ>.cilte:ra,
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1 cin;lo "linited acro" b bch uill bo prnittnd at no tabo loading utation
, one tira. Folloijng locding, tubou will be placod directly in chippin:, containeca.
Sicco thoco shipping cwttinaru uill vsry dapendire upon the langth, diaata, cnd nasay of tho urnnium in the tu':co, they will ha covered by individuni rw cuesta for approval.
General Safoty Con:sidornticus The building has been constructed of firo ronistant catorials throughout.
The crea vill bo equipped with a high invol radiation nonitor in accordenco uith cur proposed installation covered in our letter of 28 November 1958.
The discussion abovo covors the general process, spoeific health cnd cafoty provisions and general area high level radiation nonitoring. Wo cre specifically requesting extension of our Special Nuclear Material License No. SIN 33 to in-clude the pollot operation doacribed for uranium up to and including $4 U235 content.
Operations will be carried out at our Hematite, Missouri location. All other auxiliary operations necoccary, such es packaging, transportation, analytical, and storago of raw materials, will be in t.ccordance with our present licensed procedures.
If there is further information required, please contact ine immdiately by collect telegram or telephone in order to provent any undue delay in the consid-eration of this application.
Very truly yours, MALLINCKRODT CHEMICAL WORKS W. M. Imaders Technical Director Special Metals Division WMLtd.1 h
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