This is it, the ultimate power producing reactor. Let's begin with some stats to start off:
EU/Reactor Tick: 209,508
Effective EU/Tick: 1084
Effective EU/Reactor Tick: 199,508
Efficiency: 10.84 (not entirely sure if this number is accurate, may also be 6.18 )
Cycle Runtime: 25.56 hrs
EU per Cycle: 1,995,080,000 (yes, almost 2 billion!)
MOX Quad Fuel Rods Per Cycle: 23
EU per MOX Fuel Rod: 21,685,652
Total Runtime Between Cooldowns: 20 ticks (1 reactor tick)
"Cooldown" Time: 164 ticks
I am aware that by this point many are skeptical. The basic premise behind this reactor is: instead of wasting time cooling off the reactor, why not just wrench and rebuild it? Thus the titan.
Attached is a schematic of the design, a screenshot of the inside after one reactor tick, and a world file. Required mods are: Openblocks, Thermal Expansion, IC2
Warning: Only tested in 1.6.4!
On a side note, I would not recommend building this reactor in your survival worlds, this is simply a proof of concept. Although it runs stabily until it runs out of fuel, one incorrect parameter or block placement or config and it will explode. I have also not tested this reactors reaction to chunk unloading, but I imagine it would explode 9 times out of 10. Use at your own risk!
Have fun with that and let me know if you have questions or if I got my math wrong.