Any nuclear facility is a prime target to cause massive population loss/displacement.
A bomb or aircraft into one of the containment pools would spread tons of radioactive debris. Some of the reactor containment units are of questionable strength as well. A breach of the reactor core could spread tons of highly radioactive material approaching something like Chernobyl. If they think the U.S. will bomb a operational uranium plant they are really pushing the realm of reality. A single bomb could make the area uninhabitable for miles in every direction, especially downwind.
Strip
Then I'm sure you know Chernobyl had no containment building, and when the non-nuclear explosion happened, that is when the radioactive debris spread. If your goal was to put as many bombs as one could manage into the containment building, and inside of the reactor vessel itself, you
may get a rather catastrophic spreading of radioactive debris. However, any conventional bombing of a nuclear facility these days, would simply be a very messy cleanup. I would doubt though, that any area or component in the bombed facility would be usable again, at least by current standards for safety in the western world (and modern Russia).
As you very well may know, the fuel used inside of a nuclear power plant is barely a fraction refined as the fuel used for a nuclear weapon. Thus, no secondary nuclear explosion. Just a very costly, potentially dangerous cleanup would be needed. While there would certainly be issues of wider spread radiation releases for the civilian populations, it would be absolutely nowhere near in the order of Chernobyl.
