Uranium in seawater is available in much larger quantities. We would not consume the amount of uranium over the next billion years even if we used nuclear for all of humanity's energy demands [1]. It is renewable in all but the most literal sense.

Uranium in seawater is the same as the hydrogen in the sun: it's not renewable. The hydrogen in the sun will eventually be fused to such an extent that no further energy will be released. There is no such thing as a renewable energy source because the laws of thermodynamics dictate that there is a finite amount of usable energy in the universe.

https://www.forbes.com/sites/jamesconca/2016/07/01/uranium-s...