Sea water: "it is clear that it would be very risky today, to have a long-term industrial strategy based on significant production of uranium from seawater with an affordable cost" ( https://www.epj-n.org/articles/epjn/full_html/2016/01/epjn15... )

> With breeder reactors

After decades of expensive R&D... there is no model of industrial breeder reactor ( https://en.wikipedia.org/wiki/Breeder_reactor#Notable_reacto... ). Can you name one?

Russia is by far the most advanced. However, its "BN-800" reactor, which began operating in 2014, is so uninspiring that they abstain from deploying any of them, preferring the classic "VVER" (non-breeder) models, and its planned successor, named "BN-1200M," has been postponed to 2035.

This doesn't represent an abandonment of breeder reactors, as this nation is actively exploring another avenue: the "BREST" architecture (lead coolant rather than sodium), with a small demonstration reactor (300 MW) whose construction began in 2021, essentially "back to square one."