Not true. We can extract Uranium from ocean water for about $750/kilo, and there's an effectively unlimited supply of it, but we don't do so because mined uranium is only worth $50/kilo. Each kilo of U235 produces 24GWh of electricity, and you need about 150 kilos of Uranium to produce 1 kilo of U235. So instead of 24GWh being produced for $7500 of uranium, it's $112,500 of uranium. But since 24GWh is worth about $2.4m, it's still a massive win.
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@BillBones
Not true. We can extract Uranium from ocean water for about $750/kilo, and there's an effectively unlimited supply of it, but we don't do so because mined uranium is only worth $50/kilo. Each kilo of U235 produces 24GWh of electricity, and you need about 150 kilos of Uranium to produce 1 kilo of U235. So instead of 24GWh being produced for $7500 of uranium, it's $112,500 of uranium. But since 24GWh is worth about $2.4m, it's still a massive win.