In the newer fast reactors, the spent fuel will last “only” a few hundred to a few thousand years as opposed to the current waste that lasts hundreds of thousands of years.
The cost to the customer will be higher than solar or wind because of the economies of scale.
Source: https://www.galvnews.com/opinion/letters_to_editor/article_eb54ce5f-df2c-5a1b-aad8-fc29b0103b60.html