hmmm
A bit of history should be in the mix.
remember the fuel re-processing plant deal with France, which was ON- Of - ON and then died eventually.
that requirement forms the basis of this project.
These plants are not for commercial use, and thus they are not designed to produce electricity.
commercial plants have completely different designs, and use 2 stage ( if western) or single stage ( if soviet) heat exchangers to drive turbines.
Whereas , these plants are meant only to carry out a reaction X ( at a slow rate of course) so a metal P can be produced.
Plutonium in not the only metal which can be used in fission reactions,
however when Plutonium is in use following are simple to deduce.
1. War head size is being reduced for Tactical strikes OR multi-warhead missiles.
2. Fusion device is being developed, as Plutonium based fission devices are required to provide the initial kinetics.
Rest you guys can put the pieces together, all of them are there in this post.
Hope this was helpful.