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Waste disposal/processing isn't cheap and Thorium produces significantly less waste than Uranium.

Thorium waste will be indistinguishable from Uranium waste for the next 100 years, from a public policy perspective, unless we first build a reprocessing plant.

(To be more specific, it's the absence of nuclides with mass number greater than 238 in Thorium waste that makes it less problematic than Uranium waste. These nuclides dominate the long-time, i.e. millenium, radiation profile of the waste. The short-time, i.e. decade/century, radiation profile of the waste is dominated by lower-mass-number fission products, abundant in both types of waste)

Reprocessing plants are extraordinarily expensive to build and operate, more so even than reactors themselves.

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