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Iran was enriching Uranium, not producing Plutonium. Furthermore, this type of Plutonium is not what you desire for nuclear weapons material.

Iran has a plutonium reactor as well, although its exact capabilities and output are a matter of debate: http://en.wikipedia.org/wiki/IR-40

I'm skeptical that this small reactor rivaled the Uranium program. If your rush 239Pu production, you end up with a product that is very difficult to purify, raises the probability of a fizzle, and generates thermal problems for the pit.

Doesn't a lot of US nuclear power come from dismantling Russian weapons?

The needed isotope (Pu-238) is only present in small amounts in used reactor fuel.

The concern with Iran is that they might enrich uranium to the point where it is useful in a nuclear weapon (it is useful in a reactor well before this point).