This is a detonation tank to create nanodiamonds, not a nuclear device.
The Washington Posts alleges that the IAEA says foreign expertise has brought Iran to threshold of nuclear capability. This is of course, well, a lie. The IAEA has said nothing like that. It is simply an assertion made by the reporter and some “nuclear Iran” scare propagandists based on misinterpreting some factual points in the IAEA “evidence”. What that “evidence” says is: Iran is working on nanodiamond production.
(read at MOON of ALABAMA)