Where it is

As for the other non-renewable sources of energy, such as  coal, petroleum and natural gas, we must estimate how much nuclear combustible is available on the Earth and at what price. In nature an enormous quantity of natural uranium is present. The oceans, for example, contain approximately one billion cubic kilometres.
In 2017, world uranium reserves amounted to 6,142,000 tons of uranium. Uranium is present in the ground at an average concentration  of 4-5 milligrams per kg, while in the sea the concentration is 3-4 milligrams of uranium per ton of water – however, extraction of this uranium is not economically convenient because the concentrations are very low and  the costs would exceed 1000 dollars/kg. The largest known reserves of uranium that can be extracted are in four countries, which together account for 60% of the resources: Australia (30%), Kazakhstan (14%), Russia (8%) and Canada (8%) (Source: World Nuclear Association).
Also thorium is a fissile element: thorium reserves could be integrated with uranium reserves,  for reactors designed for the purpose. Besides the above, self-fertilizing reactors  can also produce fissile combustible. Therefore  nuclear fuel may be practically inexhaustible,  in a historical perspective.
It must also be pointed out that the incidence of  fuel on the cost of electric energy produced from a nuclear source is approximately 15%, while the incidence of petroleum and gas is approximately 80%, even though the costs of nuclear reactors must be assessed bearing in mind the entire cycle of nuclear energy,  which is much more complex than the other energy resources. In fact these costs include the entire fuel cycle, the construction, management and safety of the power plant, including emergency conditions, waste disposal and  dismantling the plant, if necessary.
Furthermore, the economic characteristic and efficacy of the nuclear reactors’ fuel reprocessing plants , which enable the recovery of spent uranium, must be assessed.

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