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RE: Origination, Assumptions, Restrictions for Use of Uranium SA Calc
The enriched uranium specific activity formula in 10 CFR20 App B generally
underpredicts the specific activity between 1 to 20% U-235 and above 93%
U-235, and overpredicts the specific activity at assays less than natural
uranium. At assays below 20% U-235, the use of the formula can result in an
error that may exceed 40%. For very highly enriched uranium (>93% U-235),
use of the formula may result in underprediction of the specific activity by
much as 50%. The actual specific activity of any enriched uranium depends
on the U-234% and will vary depending on what plant produced the enriched
uranium and when.
Only my opinion,
Bruce Manninen
manninenb@lmus.com
> -----Original Message-----
> From: Redmond, Randy R. (RXQ) [SMTP:RXQ@ornl.gov]
> Sent: Thursday, January 21, 1999 8:15 AM
> To: Multiple recipients of list
> Subject: Origination, Assumptions, Restrictions for Use of Uranium SA
> Calc
>
> All,
>
> I have been unable to locate the origin/good documentation of the
> uranium
> gaseous diffusion process specific activity formula:
>
> Specific Activity = [0.4 + 0.38 (enrichment) + 0.0034 (enrichment)^2]
> E-6.
>
>
> The formula can be found in the Health Physics Manual of Good Practices
> for
> Uranium Facilities and 10 CFR 20, App. B. What I'm really interested in
> is: (1) how accurate is the formula; and, (2) is it applicable to
> enrichments < 0.71 - 10 CFR 20, App. B implies it is good only for
> enrichments > 0.72.
>
> Any help and prodding in the right direction is appreciated.
>
> Randy Redmond
> Lockheed Martin Energy Systems
> P.O. Box 2009
> Bldg. 9769, MS 8081
> Oak Ridge, TN 37831-8081
> Email: rxq@cosmail3.ctd.ornl.gov
> Phone: 423-574-5640
> Fax: 423-576-6047
>
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