Iran ordered its scientists on Tuesday to start developing systems for nuclear-powered marine vessels in response to what it calls a U.S. violation of its landmark 2015 atomic deal with world powers.

Nuclear experts however said that President Hassan Rouhani’s move, if carried out, would probably require Iran to enrich uranium to a fissile purity above the maximum level set by the nuclear deal to allay fears of Tehran building an atomic bomb.

Rouhani’s announcement marked Tehran’s first concrete reaction to a decision by the U.S. Congress last month to extend some sanctions on Tehran that would also make it easier to reimpose others lifted under the nuclear pact.

Rouhani described the technology as a “nuclear propeller to be used in marine transportation,” but did not say whether that meant just ships or possibly also submarines. Iran said in 2012 that it was working on its first nuclear-powered sub. Rouhani’s words will stoke tensions with Washington, already heightened by U.S. President-elect Donald Trump’s vow to scrap the deal, under which Iran curbed its nuclear fuel production activities in exchange for relief from economic sanctions.

Rouhani also ordered planning for production of fuel for nuclear-powered marine vessels “in line with the development of a peaceful nuclear programme of Iran”.

But under the nuclear settlement Iran reached with the United States, France, Germany, Britain, Russia and China, it is not allowed to enrich uranium above a 3.67 per cent purity for 15 years, a level unlikely to be enough to run such vessels.

“On the basis of international experience, were Iran to go ahead with such a (nuclear propulsion) project, it would have to increase its enrichment level,” said Mark Hibbs, nuclear expert and senior fellow at Carnegie Endowment for International Peace.

Source: / theglobeandmail /