Found in 2 comments on Hacker News
DennisP · 2015-06-30
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It's a 1MW reactor. That's a thousand times smaller than conventional nuclear reactors. It doesn't seem unlikely that it could be passively cooled.
For the rest, a great source is the book Plentiful Energy, by the chief scientists of another small fast-reactor project at Argonne. For that reactor, the fuel is a mix of plutonium isotopes which can't be used for bombs and are much more difficult to purify than natural uranium ore. The waste goes back to the radioactivity of the original ore in a couple centuries.
http://www.amazon.com/Plentiful-Energy-technology-scientific...
It's available online also: https://www.thesciencecouncil.com/pdfs/PlentifulEnergy.pdf
I read it 14 years ago or so, after the Fukushima accident. I don't think the science has changed since then, or since the 90s when this project was shut down. There continue to be so much money in coal, gas, and oil and it's from there I think most of the opposition to nuclear stems from.
Apart from fast reactors, there's also the traditional reactors and storage of spent fuel. Finland's close to opening their process facility: https://en.wikipedia.org/wiki/Onkalo_spent_nuclear_fuel_repo...