Already built one.
I put raw uranium in, I get EU out. Nothing else needed.
Here's how it works : raw uranium gets taken by a filter to a compressor, then the uranium ingots go to a tubestuff autocrafting table where they are made into near depleted uranium cells. A separate pathway makes coal dust from coal from uu-matter. An autocrafting table then makes the near depleted uranium cells into depleted isotope cells.
The depleted isotope cells go into a large chest that has a filter on it, attached to a colored wire, attached to a bundled cable on a specific IO-expander.
Anyways, there are 3 CASUC perfect breeder reactors, and 2 fuel burner reactors. A computer program runs that when the breeder needs to be refueled, it activates a filter on the reactor to vent the contents of the reactor, which are sorted into chests. The recharged isotope cells are sent to a pathway that makes them into fresh fuel.
The computer then switchs IO expanders to one to order that reactor to be refueled. I use a transposer in the tube pathway that is closed normally, and I open the tube to select a particular reactor to receive the reactor contents.
Anyways, I refill the reactor with the exact special layout needed for this particular breeder design. I then suck empty buckets out of the casuc (cooling timer is turned off) and replace them with lava buckets 5 times to heat the breeder to 10k heat.
Upstairs there are 2 fuel burning reactors that are refueled the same way, using the same computer.
The biggest problem this reactor has is that Eloraam's computers are very buggy : I am forced to smash the computer with a pick and replace it every time I want to use it to refuel the reactor. Otherwise, it stops correctly selecting the right IO expander. I know it isn't a mistake I made, because it works perfectly every time, multiple times in a row even, so long as I don't reload the chunk. If this bug were fixed, the automation would be 100% - all that would be required would be to insert more uranium ore from time to time. Each uranium ore becomes approximately 9.8 uranium cells, which each produce 8.6 million EU. I use scrap made from enormous amounts of ice (from 12 snowmen and 96 block breakers and 96 singularity compressors) so each 8.6 million EU becomes roughly 43 UU-matter. So, each uranium ore becomes about 421 uu-matter.
All of this is built in SMP, legitly, with no cheats or op powers used, from material I personally mined or obtained legitimately.
I won't give a map download, but if you log in to my SMP server at brickedtechnology.blogspot.com, you may examine this reactor system to your heart's content. Please don't grief, and have lots of download bandwidth when you visit - the complex eats about 80 kilobytes/second if you are there (if you can't download that fast, you get kicked by the game).