Uranium Enrichment and Collimators

At the end of May, 2013 USEC ceased enrichment at Paducah.  It was the only remaining enrichment plant that was owned entirely by a U.S. entity (other plants such as the laser enrichment facility in Wilmington, NC is owned by GE-Hatichi).  This would be the first time since 1945 that the US no longer has the capability to preform it's own enrichment.

Another cool little tidbit of history is the A.Q. Khan (the father of Libya's enrichment program) was actually a very good centrifuge designer.  A large problem facing non-proliferation is preventing states from enriching above 20% (though you only need about 5% to make a good reactor fuel). It is really just a manner of plumbing.

Each centrifuge (the cylinders) has three pipes coming out of them, the input, heads and tails. All one has to do is reconnect these pipes and the centrifuges can go from optimally producing reactor grade uranium to weapons grade.  Of course, the reconfigured arrangement won't be the optimal for yield and energy usages, but Dr. Evil rarely cares about the environment.

Possible cascade options. Source

In any case, our collimator will try to pick out a single centrifuge in a bank of centrifuges, as well as looking at spent fuel.