GregTech also adds new components for the Nuclear Reactor.
The Iridium Neutron Reflector is a neutron reflector with infinite life span.
Obtained by centrifuging large amounts of Uranium. This cell produces twice as much energy and heat with double the lifetime of a regular Uranium Cell. It effectively produces four times as much EU as Uranium.
Plutonium Cells can be crafted into Dual and Quad cells. Use the same recipe as uranium Dual and Quad cells, replacing the uranium with plutonium.
Obtained as a byproduct of centrifuging Uranium, these cells produce as much EU as Uranium, but spread over a five times longer lifetime. They produce 1/5 of the Heat/Second of a regular Uranium Cell, so it's much easier to manage breeder reactors. Recipe: see above.
As of 1.36a, Thorium Cells can be produced by centrifuging depleted Uranium Cells at a 2:1 ratio, however, breeding Uraniumcells is still better.
Thorium Cells can be crafted into Dual and Quad cells. Use the same recipe as uranium Dual and Quad cells, replacing the uranium with thorium.