[noiseman]

100 megawatts? A conventional fission reactor typically produces ten times that amount.

[Nateman]

100 Megawatts is about what nuclear subs have. Our Carriers generate about 500 Megawatts per reactor.

[FarCenter]

Most of the 60 under construction are over 1000 MWe. However, there are a number of small ones. They are probably prototypes or research reactors.

https://world-nuclear.org/information-library/current-and-future-generation/plans-for-new-reactors-worldwide.aspx

[verum ago]

100 megawatts? A conventional fission reactor typically produces ten times that amount.

Yeah, that is a hell of a lot of money to spend for 100 MW, especially in a country that has no compunction about burning coal and vastly lower building costs and red tape for such things than the US.

My gut reaction is : what are they up to?

To pull a wild guess out of my tailpipe, I'd say it's some sort of disguised breeder reactor for weapons material or some other exotic thing.