Iran is and will continue to have a peaceful nuclear program because nuclear science has limitless benefits that Iran needs. From obvious ones like nuclear power to help Iran close the gap between its electricity production and the consumption that is growing rapidly to various usages in other fields like
- water desalination that can help Iran cover part of its water shortage used for drinking and agriculture,
- fields like agriculture itself for which I think is used for eliminating pestilence and improve production,
- fields like medicine that Iran is currently one of the most advanced producers of radiopharmaceuticals that are used to diagnose and even cure various diseases such as cancer,
- and a lot more.

Iran as a member of Non-Proliferation Treaty (NPT) has the right to enrichment at any percentage (eg. >90%).

Now it is worth saying that also as a member of NPT, Iran has the right to activate article 10 which gives Iran the right to also build nukes since the country is being threatened by regimes armed to the teeth with weapons of mass murder including nukes.
Whether Iran is going to go down that road remains to be seen. If that decision is made, nobody is capable of "not letting" Iran to build them. For the time being nukes are ideologically ignored (are considered haram) but that can change if the threats against Iran are manifested in a way that pushes the country in that direction.

I personally say that Iran must build its first 10 nukes by the end of today because of these terrorist attacks.