Uranium. Most current power reactors use Uranium enriched to 3% Uranium-235.
An enriched pastry often used for the base of a tart
i dont know why ask me
Uranium 235 Plutonium
I think you mean Uranium /U/.
Uranium I guess
The resource most often used is uranium, extracted from uranium ore and refined and enriched. You can replace uranium used with fresh uranium, but you can't renew the uranium source, once used it is gone, which is why nuclear energy is non renewable.