Yes - cost v benefit - ha!

I don't see nuclear proponents comparing potential cost (say $10T) against benefit (power produced during plant's lifetime - optimistically $10B (over 30 years). That's 1000:1 against.

By wikipedia, there are about 170 nuclear power plants and have been 6 accidents costing over $1B - approximately 1 in 30 plants have had very expensive accidents.

Those odds don't make sense for any country. Though they might make sense for an investor, knowing that they won't be required to pay those big costs - they might win and (in the event of a disaster) they only loose their investment. Perhaps if they have to guarantee the $10T potential costs, they'd look realistically at the "investment".