You can't use them in the extraction step, but with them in the nuclear fuel creation step and the kovarex step, it's within 1% of being over unity (might actually be over unity if you perfectly balance the split between centrifuge and assembler). Even with production modules only in the assembler, ...

Would anyone agree that the default settings for modules are way too powerful, and make the endgame less interesting if used? Using default settings, back of the envelope seems to say it's possible to get 10k spm with less than 200 raw ore per minute. Logistics comes down to how many max tier belts ...