""never needed refueling" Wouldn't that be fascinating?" The act of refueling is not a problem in ICE cars. It's arguably their greatest advantage (only?) over

""never needed refueling" Wouldn't that be fascinating?" The act of refueling is not a problem in ICE cars. It's arguably their greatest advantage (only?) over electric ones. " I Guess (wishful thinking maybe) that the radiations would be far less dangerous and more local than is explosion and fire from current car crashs." And you'd be guessing wrong. A breach in the containment would be catastrophic for the whole neighborhood, if not city, for decades. " The thing is, such experts will not read this thread " Actually nuclear experts do, sometimes, show up. " But I want a nuclear expert to show me a calculus that would show if the dangerosity is negligible or higher (how much) than current crashs." Buy Lamarsh's book. It has all the calculus you want. Amazon has it for less than $40. I myself have a copy in my basement and it's a good book. " reusing the wastes or provably safe reactors which necessarily auto shutdown by design" I don't know much about breeders ("reusing" waste reactors), but I doubt you could contain the neutrons of fast reactor. No design is "provably" safe (this isn't 10 LOC run through Coq). The industry uses the term "inherently" safe or, better, "passively" safe. It typically refers to the reactor power naturally tending to zero if the safety mechanisms fail. If you crash into cement barrier, though, all bets are off. ""we don't have a solution for the contaminated [...] But I expect it to be trivial" and you'd be wrong. Waste management is the number one problem of the industry. "but it was like a few kilos at most" Actually it's in the tons, you're confusing waste with mass that no longer exists as it became energy. 1Kg is the amount of mass that became energy through E=mc^2 (try it: 1GWe reactor @ 0.3% thermal efficiency running for 365243600 s = 1.05E17 Ws = m * c^2 -> m = 1 Kg) But that's only about 0.1% of the total mass of fuel and waste... therefore tons! " So for a micro reactor in a car it should be a few grams at most" It doesn't scale linearly. "This already exists, but democratize very slowly due to lack of funding because of irrational politics driven by hysterical people fear " A patronizing attitude towards people's fears mixed with general ignorance on the subject doesn't bode well.