Hi. First of all, Really great mod. I enjoy it.
To create 10 empty fuel cell you need 10 Steel plate and 1 Rare metals. But the Nuclear fuel reprocessing you get back 5 Steel plate and 1 Rare metals for 1 Used-up uranium fuel cell. Is this recipe correct or should it be 10 used- up fuel cell instead of 1?
Sam thing with the declading och MOX-fuel.

Both uranium processing recipe and Kovarex recipe is not available in the centrifuge after I researched it. Is it supposed to be in that way?

Yes, I decided to introduce a loss of material in reprocessing logic. There should be no Kovarez process because it is not realistic. If you want. Instead, you have a plutonium cycle.

It was a while since i played this mod but as I remembered it you got more material than you put in. 10 empty fuel cell = 10 steel plate + 1 rare metal. And then the Nuclear fuel reprocessing: 10 Used-up uranium fuel cell = 10 x ( 5 Steel plate and 1 Rare metals) = 50 steel plate and 10 rare metals.

Isn't it better to remove uranium processing recipe and Kovarex so you can't research it at all?

+1