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Even though it was on Ukrainian soil, still: USSR had Chernobyl disaster, not Ukraine. It’s one of the reasons Ukraine separated from USSR.

I suspect that legally speaking Ukraine is one of the successor states of the USSR?

Doesn't matter too much for the point I made in any case:

If a nuclear disaster were to happen in Ukraine now, NATO and EU would also not blame it on Ukraine.

So, USA used nukes 2 times, while USSR blow up 1 nuclear reactor.

2:1

If you want to count it like that:

Both USA and USSR nuked themselves a whole lot more when testing nuclear weapons. See https://en.wikipedia.org/wiki/List_of_nuclear_weapons_tests