Iran, Angered Over Obama's Renewal of Sanctions, says it will develop nuclear-powered warships
Iran's President Hassan Rouhani orders nuclear-fuelled warships
Is this a violation of JCPOA?
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Note: It is almost always a good idea to link to the source of the news, to better address the points noted there.
Technically, it does not violate the deal because the deal forbids Iran to enriching Uranium, not to develop power plants. The main way of ensuring that are the ongoing IAEA missions, that so far have raised no warning signs.
That said, experts seem to agree that:
power plants for nuclear vessels needs a supply of Uranium enriched beyond what the JCPOA agreed to, even if way under the grade needed for weapon building. So basically, they are vowing to develop ships that, under JCPOA, they would be unable to provide fuel for.
developing such ships is not an easy task, it is expensive and may take up to a decade. It does need not only of the ships themselves, but also of very specific port structures.
from an strategic point of view it is a dead end. Nuclear powered vessels are used for ships that need long range, and the Iranian Navy lacks the capacity to supply and operate those ships, (very few countries do have that capability, see Blue-water Navy).
It is not a nice gesture, but it can be understood as a reply to the US Senate resolution of 1, Dec (which, in turn, is not a nice gesture but does not violate the JCPOA, either). Similarly to the US Senate resolution, it allows Iran politicians to show off a hard stance to silence their critics, without actually committing them to violate the JCPOA or changing the status quo.