There is a report by russia today [rt.com] that fukushima has cost $105 bn. Greenpeace (which hates nuclear power) claims a damage of $205 bn [greenpeace.org]. So, the range of nuclear meltdown damages is in the range of hundreds of billions of dollars. Now, the insurance company munich re reports [munichre.com] that they had to pay $31bn in 2014. I really think that it is doable to scale their business. So basically, there is one nuclear incident every 20 years world-wide. Lets be generous and say it costs around $400 bn. Now, the nuclear industry would have to pay $20 bn every year for such an insurance, world-wide. With a number of 438 reactors [euronuclear.org], that's $44 million per year. Energy companies make much much more with nuclear power on reactors in average than this amount, don't you think?
Great research and figuring, but with respect, I don't think the conclusion is warranted. One nuclear incident neatly packaged into a periodicity of 20 years is only an idealization.
What if chance does not smile, and you just happen to have three of those $400 billion catastrophes happen in one year. Or even one of them, but not 20 years after you begin your project, when you have accumulated all the take to pay for it. What if it happens the first year of your plan, when you have practically no take accumulated to pay for it.
I am strongly disposed to think that liability against catastrophes this mind-numbingly severe (also mega-hurricanes, devastating earthquakes, etc) is only feasable to be remedied by society as a whole - a.k.a., the government. As it always has been.
It is society as a whole which requires reliable and plentiful power; let it be society which insures against the catastrophes. In exchange, society gets to set engineering and operating rules. Maybe society in the form of an "operating priesthood", a governmental operating entity like the French have had such success with, should run such a critical industry. It would be imbued with the highest order of training, professionalism, and selfless excellence, and completely isolated from any influence of profit motive whatsoever.
If this offends the religious faith in free enterprise, we need to adapt and open our minds. After all, nobody denies that SOME THINGS only governments can do justice to. Is this not one of those things?