original post has been deleted, due to be building this design, make fun if you want, but I dare you to beat it. (in breeder efficiency not EU output)
http://www.freeimagehosting.net/db509
produces 32 heat to hull, use water cooling on all but one block. HP is, reactor 10k, 6 chambers @ 1k each, and 49 plates @ 100 each, = 20900HP, 10k heat is below half so no evaporating water, even if it did you can place source above it and it wont matter.
As you can see from the pic I am going to beable to have both cells enriched before my u-cell dies, perhaps even a whole another run so for now this is at LEAST making two enriched for one uranium.