Improved my old design and this is the result: compact 9x9x7 bucket CASUC that produces a whopping 1840EU/t. No power spent on cooling.Video link is in the bottom of the first post.
Mods required:RP2 and IC2 1.81+, Railcraft heavily recommended for world anchor(BC+additionapipes works too).
ALWAYS check the functionality of the cooling and wiring system before running the reactor for the first time with the setup mentioned below by throwing in just a couple of uranium rods instead of the full load.
Water only starts evaporating from buckets if the reactors hull reaches 4000+ heat, so don't be alarmed if the heat raises quickly in the beginning
This reactor is designed to work if built in a single chunk, as I have heard that tubes may lose/drop items if you are away and the reactor/cooling system chunks aren't loaded.
I have ran seven of these for 5+ cycles each with world anchors so chunk being unloaded isn't the reason if yours blows up.
I'm not responsible if you are unable to build one properly and blow it up.
One timer which is set to tick every 0.550 sec runs the whole cooling system. Down in the middle is the lever that turns off the reactor and the cooling system. Simplicity at its finest.
A single cycle produces 368 million EU. That makes almost four stacks of diamonds if used in a mass fabricator supplied with scrap. Or a couple of quantum suits...
nuclear reactor and six chambers,
exactly 39 red alloy wiring(non-insulated),
1,5 stacks of stone(any solid block should work but I suggest not to use anything that burns),
5 stone covers,
88 buckets(eight filled with water to be placed inside some of the filters),
10 pneumatic tubes,
42 uranium cells per cycle.
Broken down cost/efficiency and some stuff about efficiency:
You might be able to lower the amount of buckets to somewhat 70. One possility is to add a few more(2-4) uranium cells if you want a slightly higher output.
These worked for me, but be a bit cautious if you do it. Lag spikes may cause it to explode or just to heat too much to start melting stuff in front of your eyes in the long run.
Vs. ice reactors
This design makes a very high amount of EU per resources consumed, and saves uranium when compared to ice CASUCs because they consume some 10-25% of the power they produce for cooling the reactor. It may have a higher starting cost but if you don't want to mine a lot I'd say the starting cost is worth it especially if you are using breeders as you can have it producing power with a high a uptime.
One additional benefit is not using retrievers so that you don't need to go kill those pesky endermen or cows.
Link to the tutorial video: http://www.youtube.com/watch?v=sqdG8QP_r_0&feature=youtu.be
A blueprint made with icons on my next posts(posts number 5 and 6)