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Issue #23026: Rad scrubber arches in The Nucleus do nothing after quest "Ablutions" is done
According to a bug report on Nukapedia...
After completing the quest, then leaving and re-entering the Nucleus, the decontamination arches will only spray mist, and not affect the player's rads in any way, regardless of whether or not they chose to reverse the alterations.
I can confirm that at least the reversal will make the archways do nothing.