What Hansen is advocating are plutonium fast breeder reactors. Like the Clinch River plant that was cancelled in the 1980s. He wants to mass-produce them on an assembly line. He wants small distrubuted plants full of plutonium. This is one crazy dude.
He never defends his assertion that nuclear can ramp up faster than solar and wind. He ignores the fact that the government continues to massively subsidize nuclear via the Price-Anderson liability limitation and support for research. He ignores the fact that current plants take 10 years to build. And when he says the new plants would be cheaper than existing plants, I had to laugh. Cheaper than "outrageously overpriced" is still not all that cheap.
So yes, fix the waste problem, fix the terrorist problem, fix the fuel supply problem, fix the cost over-run problem, and fix the economically un-competitive problem And THEN we'll talk.