"Breeder reactors could, in principle, extract almost all of the energy contained in uranium or thorium, decreasing fuel requirements by a factor of 100 compare

"Breeder reactors could, in principle, extract almost all of the energy contained in uranium or thorium, decreasing fuel requirements by a factor of 100 compared to widely used once-through light water reactors, which extract less than 1% of the energy in the uranium mined from the earth.[3] The high fuel-efficiency of breeder reactors could greatly reduce concerns about fuel supply, energy used in mining, and storage of radioactive waste. " https://en.wikipedia.org/wiki/Breeder_reactor https://en.wikipedia.org/wiki/Breeder_reactor China, India and Russia are operating these with Russia having the biggest one that produces 800 MW.