To make fissile material generate heat in a chain reaction is easy. Example: the first nuclear reactor was little more than a pile of uranium surrounded by a hand-stacked wall of graphite bricks. But making use of nuclear energy efficiently, safely, and controllably does take a high degree of sophistication. So I'm not saying that the bar for making nukes is low, I'm saying that Iran has set the bar high for themselves. It wouldn't be too far out of their way to build a nuke once they got a reactor online.
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