Just wondering if anyone had any input on this. As far as I can tell the answer is near zero.

From
http://www.globalsecurity.org/wmd/wo...an/bushehr.htm

It sounds like a plant like Iran is making could produce enough plutonium for 30 bombs per year. What is required to get the right plutonium amount is to pull the fuel rods at ~4 months instead of leaving them in longer.

However, depending on how they rotate the fuel rods, that means that there could be up to 10 nukes worth of plutonium just sitting there. That number being for putting all rods in at the same time, waiting until they reached the desired time period and then pulling them.

The rest of the project could have been done elsewhere. For a simple implosion type device it's simply a matter of getting the stuff in the cores turned into balls. That process is what I have no idea about.

Otherwise it sounds like you have minutes to hit a nuclear power plant if fuel is being taken out to stop it. Probably impractical if not impossible to do. Then you have some small amount of time to locate and destroy wherever the final refinement is taking place before the country in question becomes a nuclear power.

Maybe a couple days?