What's strikes me is that the cost of operating a nuclear plant during its lifetime is actually unknown, making it the expensivest energy source. Why it is still in use : obviously because it serves as base technology and knowledge to build weapons.

Some example of hidden costs not included in nuclear kwh price :

- Cost of managing waste: How can you evaluate cost of managing basically forever (at the human scale) dangerous wastes ?

- Risk prime to insure huge damage that could arise from accident or future leaks in storage area : Again this amount is so big, that this externality has to be socialized.

- Cost of dismantling a plant : Beside one or two exceptions, no plant has been successfully dismantled. All the planning and costs for the currently plan in dismantling are exploding and will take years and tons of capital ... leaving more unmanageable wastes and unusable lands.

All those aspects will become increasingly difficult to manage in countries that made the (bad) choice of going full nuclear a few years ago, like France.