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I Mallir.ckrodt Chemical Works C
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't-Seccad and Mallinckrodt Streets St. Louis 7, Aissouri
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Attention:
Mr. Frederick M. Belmore Special Assistant to the President
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~&c Gentlemen:
Enclosed is Special Nuclear Material License SNM-33, Revision No.1.
This license authorizes you to receive and possess for use as descrioed in your June 18, 1956 application up to one kilogram of U-235 contained in uranium enriched to about 20% in the U-235 isotope, in addition to the 7)% material previously licensed.
Before we may further review your application in regard to licensing you to receive and possess more highly enriched material we will require the following additional informations 1.* After hydrolysis of the UF ou state that subsequent processing will be done in 0.7 pound batches. How is the hydrolysed material separated into 0.7 pound quantities?
2.
The hydrolysis hood, you state, is curbed for a depth of four inches and will have sufficient capacity to hold the entire contents of the hydrolysis system. This is not a geometrically safe system for top enrichment material. Will the hood be modified to be geometrically safe, or will batch control be used to prevent accidental criticality? If batch control,
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please describe how control will be exercised.
3.
A four inch deep by twelve inch diameter filter is very close y
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Is a batch limit i i. gf to a geometry which can be mads criticalp
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planned, and, if so, what limit, and how will it be insured.
4.
You state that racist filter cakes will be removed from the filter in batches containing 0.7 pounds. How are batches limited e
to this size?
f In generag in processes where safety dependence is placed on 5.
batch size control rather than "always safe" conditions, you i
should provide additional information on the system of checks and balances intended to insure proper control.
_M N a general comment we note that there seems to be some mis-7
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understanding of the term "always safe" and where the concept it implies may be safely invoked. Where certain supervision, bockkeeping, procedural controls or other limitations are
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necessary to insure safety at any point, "always safe" has no meaning, and the term " limited safe" more properly applies.
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On receipt of the additional information requested we will further con-l sider your application for highly enriched uranium.
Very truly yours, 2
Igall Johason
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AN ALY T'C AL AND INDUSTRIAL PUNPOSES
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f august 2,1956 Dr. A. D. Callihan l
Oak Ridge National Laboratories Post Office Box P I
Oak Ridge, Tennessee i
j Dear Dr. Callihans I should like first to express sincere appreciation for the fine cooperation you and your assooistes gave Mr. Marsh and me during our noent trip to Oak i
l Ridge.
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Following this visit I was in sentact with Washington concerning the steps necessary for a fully enriched lisense. At this time they informed me that the presence of the 14" slab tank would make it impossible for them to issue the license. We therefon started immeMately to mdesign this scrubber system in socordance with broad plans discussed with you. Our ' phone con-l versations earlier this week were an attempt to speed up the design work and to beroertain that our dimensions would in fact give us a safe system. The j
enclosed drawing is an attempt to follow the moommendations you have given us over the 8 phone.
f You will reea11 that home ejectore sa the reservoir peup erstem sembined l
therewin are for the sole purpose of recovering aar UF that udskt escape j
from the lydrolysis appanetus. The amminum answat af ium which will be present in thLs eating system at aar given time will be a single top product oylinder which is liatted, we understand, to 60 pounds of UF / I 8188*M17 6
hope that with this inforestion and eer discussion of the operation last week I
that you will have suffiesent data.to estiente the safety fasters asaseinted t
wie his ase design. It is possibla that k. Delaney of the Washingten
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offies will be in osatset with you at an early date to stetata year opinion.
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Based on our 'pheme eenversation and your 1 ster call to W. Herek, we will pressed wim the taketestama et this egnipment in eeeer to expedite me job and attesyt to sesever some.et the ties we have last toenese of our enklier esser. Therefeso, if you find something set'et lias, as wou3d approeiste a ea11 at your easiteet eenveniames.
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Dr. A. D. Callihan Pa Itso August 2,1956
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startup early in fleptember. If you and your associates are in the vicinity
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of St. Louis at any tirs, we would consider it a nrivilege and pleasure to i
have you visit this new production faoility.
Simoerely yours, ELLIN0KROOT CEECAL WOMS
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W. 14. Leaders Spoo141 Metais Divi. ion i
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