I will place my various reactor designs here.
Here is the current system which I use to breed all the fuel for my uranium reactors: Note: it uses a thorium cell from GregTech. Also, works best with an automatic system for feeding it depleted cells, as well as to turn it off when you run out of cells.
Maintains a steady heat of approximately 64k
recharges 440 depleted cells per thorium cell.
Main problem would be obtaining the 1395 copper needed (i sent my turtles to go remove a few chunks from existence)
Does not damage players who get near it.
Here is the reactor Which i use to consume the uranium bred above.
notes: works better with GregTech iridium neutron reflectors, as those do not need replacing every cycle.