Iridium Reinforced Fuel Rods are containers for Coaxium Nuclear Fuel. They cannot be used to hold Cesium Nuclear Fuels.
Iridium Reinforced Fuel rods can only be crafted with an empty Fuel Rod, Dense Diamond Plates, and Iridium Ore.
Reinforced Iridium Fuel rods are placed in a Canning Machine with Coaxium Enriched Nuclear Fuel to make a Coaxium Fuel Rod.
By exploiting the amazing properties of diamonds and Iridium, you can create a fuel rod, that when placed in a Nuclear Reactor, will produce NO HEAT! HAYO!