[Symmetry]

Wait, the idea that the cost of a power plant structure is proportional to its size seems very remarkable to me even within a single technology like light water reactors or gas turbines. My understanding is that generally there's some most efficient size to a reactor or turbine or such because of non-linearities and if you want to increase the power generation of a plant you replicate these most efficiently sized structures rather than scaling them up.

The idea that you could apply the same linear scale to both fusion and fission reactors seems frankly incredible on the face of it. Do you have any details on why this should be so? I don't seem to have access to the second source you listed and the first just made this assertion without explanation. All this isn't to say that I'm sure fusion reactors would have to be less expensive per cubic meter than fission reactors, the opposite seems like it could be a possibility. It's just the idea that we should expect the price to be the same in both cases that I'm finding hard to swallow.