I have been playing the Krastorio 2 mod and it requires the Kovarex enrichment process. After discovering that the Nuclear Fuel mod disables/removes the Kovarex enrichment process I uninstalled the Nuclear Fuel mod but the Kovarex enrichment process does not return. Is there a fix for this?

I haven't been able to think of a way to make the mod automatically undo that when it's removed, but I think you should be able to manually fix it by typing the following in console:

/c game.player.force.reset_technology_effects()

It did not work. I disabled the Nuclear Fuel mod; ran the script but it did not enable the Kovarex process.

Sorry about that, I haven't played Factorio for a while except for updating mods.
This should work (it reloads the technology prototypes, but doesn't reset research progress):
/c game.player.force.reset_technologies()

If it doesn't, try this:
/c game.player.force.technologies["kovarex-enrichment-process"].enabled = true

Thank you. The last console script worked.