> You can't build a building that contains a steam explosion from a runaway reactor. If you could, the reactor could be made indestructible in the first place.
Wrong: we can, and do, build concrete domes that contain a potential steam explosion. The pressure vessel has to connect to steam generators, control rods, and more whereas the secondary containment does not. Furthermore, once the pressure vessel explodes, the water boils off and is no longer being heated by the core.
> Chernobyl has cost over 600 bn since 1986 and costs billions per year still, and will do so for the foreseeable future. The same goes for Fukushima.
Got a source for these claims? Especially the "billions per year still" for Chernobyl? Even the more extreme estimates claim $200B for Fukushima, and much of that is speculative (nowhere near that much has actually been spent).
> Other countries can use other methods, like store heat, for example in molten salt. Thermal solar power plants generate power even during the night. Or you can generate Hydrogen or Nitrogen. Or you can store pressurized air on the ocean floor. Or you can use batteries.
Except for solar thermal (which was never cost competitive, and still suffers from intermittency due to weather), all of these things are experimental. Like I said: in order to make intermit energy sources feasible, we need some new form of energy storage that yields order-of-magnitude improvements over existing storage systems. Maybe some of these will be our silver bullet for storage. Maybe not. Most don't want to gamble the future of civilization on the guess that some silver bullet will be found.