Of course there are huge costs to thiskindofintervention in the marketplace, thus the president is granted discretion, under the law, to deny relief if he determines that the costs to the broader economy clearly exceed any benefits to the petitioning industry.
Barring forcible interventionof some kind, it's highly likely Iran will fire up this reactor in earnest later this year--and start cranking out, on an industrial scale, spent fuel that can be processed into plutonium for nuclear bombs.