> $800 billion
Even taking that figure completely at face value, that's... not a lot of money? Italy's GDP is 2.1T, if a Fukushima-like disaster happens once in 30 years (which it doesn't, but for the sake of argument let's say it does), that's an amortized cost of 1% of the GDP.
We're Italians, we'd waste that kind of money on some stupid shit anyway.