They wont use nukes even having high caulties. They will prefer to hide casualties. That is because of logic not magic. They can think of using it after Iran gives all heu back for a ceasefire and conflict restarts. Otherwise isreal would be sprayed with heu when nukes are used and they dont want that. Mutated chosens, that wont be good as trump would think.
After giving heu if that is on the table Iran should think of nuclear deterrence even without having nuclear weapons. One deterrant without the heu is the already existing good delivery systems that is the ballistic missile force that can engage nuclear centrals cooling pipes-systems at will to generate melt down if isreali/usa nukes are used. Another I can think of is depleted uranium warhead bunker buster ballistic missiles. Any other measure Iranian officials need to think and it is not the place to write here publicly. With thinking good deterrence would still exist even without nukes.
If these are gone they will use nukes with smallest casualty rise. There were claims that a tactical nuke was used in Iraqi desert after a high casualty on a usa base.
An American war veteran has claimed that the U.S. dropped a nuclear bomb during the last days of the first Gulf War in Iraq in 1991.
www.rt.com