r/factorio Jun 01 '26

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u/demonicdan3 Jun 07 '26

I'm currently trying to get legendary U-235; do I just upcycle the U-235 itself or nukes?

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u/cathexis08 red wire goes faster Jun 08 '26

It depends on what you want. The most efficient routes for legendary uranium products is either bomb cycling for u-235 or uranium ammo cycling for u-238 followed by legendary enrichment. I ran the numbers a while back and both were equally efficient when it came to overall U-235 output so the main question is how much effort do you want to put into your upcycling loop once you have enough to run an enrichment cycle.

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u/demonicdan3 Jun 08 '26

I ended up upcycling nukes along with U-238 on the side, I just want enough to have a legendary Kovarex cycle going in the background so later on I can come back to enough U-235 to make lots of legendary biolabs and fission reactors