Gah, I was this one addon somewhere a while ago and thought I didn't need it, now I really do, if anyone knows of it's existence and where I can find it please reply, I'm an hour into searching for it

Addon for the re-enrichment of uranium?
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Never mind, just found it, it doesn't contain the full re-enrichment process but brings you near it, it's called "Reactor Stuff"
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- Official Post
You can understand with such a memorable name why it took some effort to remember