Have you got a source for that ?
Washington post article:
""""" But the government's centrifuge scientists -- at the Energy Department's Oak Ridge National Laboratory and its sister institutions -- unanimously regarded this possibility as implausible.
In late 2001, experts at Oak Ridge asked an alumnus, Houston G. Wood III, to review the controversy. Wood, founder of the Oak Ridge centrifuge physics department, is widely acknowledged to be among the most eminent living experts.
Speaking publicly for the first time, Wood said in an interview that "it would have been extremely difficult to make these tubes into centrifuges. It stretches the imagination to come up with a way. I do not know any real centrifuge experts that feel differently. """""
The behind-the-scenes wrangling over the purpose of the aluminum tubes is also covered pretty thoroughly in this article in the New York Times (posted here at a lefty site, but it's better than having to register with the NYT):
Also this one that I just googled up. It's a lefty site, too, but it looks pretty well documented:
Bottom line is that the DOE and the State Department were *very* skeptical of the CIA's claim that the tubes were for uranium enrichment, and it looks to me like they had some pretty good reasons for being skeptical.