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Breeder reactors research was quite huge (one of the first breeder was built in the US in 1951).

Then this technology has been, for all practical purposes, abandoned by nearly all countries that were researching and developing it. See https://en.wikipedia.org/wiki/Breeder_reactor#Future_plants

One of the most (if not the most) ambitious project was Superphénix, costed billions and failed flat. https://en.wikipedia.org/wiki/Superph%C3%A9nix

The sole officially actively pursued pertinent design, BREST-OD-300 ( https://en.wikipedia.org/wiki/BREST_(reactor) ), was planned to be built in 2020 ( https://www.world-nuclear-news.org/NN_Fast_moves_for_nuclear... ) and real work didn't even began ( https://www.world-nuclear-news.org/Articles/Russia-awards-co... ). Moreover it will only (when built, if ever, but not before 2026) be a demonstrator (low power).




Superphénix was politically killed. The technology was promising.




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