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What is Called Nuclear Waste is Mostly Unused Fuel for Molten Salt and Fast Reactors

• by Brian Wang

The waste is fuel that is mostly even numbered isotopes.

Unused fuel (aka nuclear waste) can be used as fuel in fast reactors like old fast reactors and molten salt nuclear reactors. Molten salt reactors are being developed in China and many by US companies.

96% of the mass of "nuclear waste" is the remaining uranium: most of the original 238U and a little 235U. Usually 235U would be less than 0.83% of the mass along with 0.4% 236U.

Uranium 238 can be fissioned in any nuclear reactor that generates fast neutrons.

About 20 fast neutron reactors (FNR) have already been operating, some since the 1950s, and some supplying electricity commercially. Over 400 reactor-years of operating experience has been accumulated. Fast reactors more deliberately use the uranium-238 as well as the fissile U-235 isotope used in most reactors. If they are designed to produce more plutonium than the uranium and plutonium they consume, they are called fast breeder reactors (FBRs). But many designs are net consumers of fissile material including plutonium.* Fast neutron reactors also can burn long-lived actinides which are recovered from used fuel out of ordinary reactors.

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