Yellorium Fuel Rod

The Yellorium Fuel Rod provides space for fuel to be burned within a multi-block reactor from Big Reactors. For each fuel rod block within the reactor's core, the reactor's capacity to contain fuel and waste increases by 4000mB (4 ingots worth).

Placement
Fuel Rods are special blocks; they only function inside a reactor, and their positioning inside the reactor determines how efficiently they operate. Placing them anywhere but inside the reactor has no effect, and a reactor with fuel rods on its faces (top, bottom, sides) or frame will not assemble.

So in order for a fuel rod to be valid, it must be part of a column of fuel rods that reach from the reactor's floor to its ceiling i.e. within the outer shell of the reactor. The block beneath the fuel rod column must be the floor of the reactor and must be a Reactor Casing block. The block on top of the column must be a Reactor Control Rod. All blocks between the casing and the control rod must be fuel rod blocks.