So I use a pretty basic reactor setup with LZH Condensers in the 2nd 4th 6th and 8th columns with MOX Rods (Quad) In all of the other slots.
I get the reactor to 50% heat putting in one or two quad fuel rods and then i start the actual working.
It seems stable at first and the heat doesn't go up and produces ~8192 EU/tick
But if I move away from the reactor it explodes.
The same docent happen with normal fuel rods but it produces only 2800 EU/tick