Just a couple of things
If there is a radioactive footprint around an enrichment plant there are some SERIOUS PROBLEMS like you know a leak or something .
The system being used by Iran is a cascading system of centrifuges, basically they spinn Uranium hexafluoride and the heavier atoms spin to the outside where they are removed that type of enrichjment is used almost exclusivly for producing weapons grade products. The USA and Russia uses it for both weapons and producing fuel due to the cost of building the plants. If the Iranians wanted a simple power reactor they would have gone with a design that does not use enriched fuel there are several available. That they did not is what caused the UN to take notice.
The "moving goal posts" is a result of the almost total non compliance by the Iranian govt. The recent commissioning of a new set of centrifuges which is far beyond what they need for reactor fuel is ust another example of that.
Previously Iran had been enriching up to what is it, 3.5% needed for nuclear power and now has started enriching up to 20% for medical reactors. And as far as I know, there are no limits on what type of reactors you're allowed under the NPT, as long as they are for power generation. Didn't the US even start supplying Iran with reactors, before bailing and then pulling a fast on them in a previous plan to ship out unrefined uranium in a swap for fuel rods? I seem to recall that Iran was ripped off, with no fuel rods ever coming back, though can't remember offhand how many decades ago this happened.
The recent set of centrifuges pissed off the states, but were still legit according to the NPT, as Iran did notify the IAEA 6 months prior to the centrifuges being put in use.
Personally, I'll be happy if Iran gets its reactor going and is not bombed, as that means it will become almost impossible to bomb the reactor without heavy fallout (nuclear and political) and that means it is much less likely that Israel will start another war.