Err... No? PTFE (Teflon) is necessary to handle the really nasty Uranium flourides that are used for Uranium isotopic enrichment. Not used, AFAIK, for the plutonium route at all.
I could be wrong, this was from memory of my undergrad days in Physics, but the solutions you need for plute extractions are rather nasty - I think (from memory) its a purity issue, you need something that doesn't react at all so there is no contamination.