Here a plan a set up some times ago, when the Reactor Planner v3 came out.
http://www.talonfiremage.pwp.blueyonder.co.uk/v3/reactorplanner.html?21p7drd87b5abt5mgecl99xq8t355o3sh3uyol2emn7bbm0e1f0sfd3kbbui2vpg4oyj3rq2l5cn37k
This layout grants you a Breeder Reactor that gives 180EU/t , full...