Nuclear power plants are, by necessity, basically just giant bunkers with a reactor buried somewhere within. In a war the only reason to attack one would be typical shock-and-awe tactics to take down electrical grids, in which case it'd be easier to just blow up the substations connected to the plant instead. The only way you'd kick off a Chernobyl would be if you very intentionally decided to do so with some pretty serious ordinance, at which point you'd be the insane motherfucker who just poisoned half a continent for no good reason which might just be overt enough to convince even Americans to toss a few molotovs through your window on general principle.