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No, it is also needed for naval reactors. They have to use highly enriched uranium in order to be small enough to fit on a boat.
Sort of absurd to think about, but it sure would be a pain in the ass if the US navy had to worry about fast attack submarines sneaking up on their carrier groups.
The French have been operating nuclear submarines with LEU for decades, so it's not exactly a hard requirement
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They don't have to, but the US submarines do. I believe the Russians and UK do, and therefore India as well. Not sure about France and China, though.
They'd be pretty useless to Iran, though, as they don't need boomers (sonce they don't have nuclear weapons, natch), and they don't need to transit significant distances at high speed. See also: why the Baltic/Nordic powers don't bother with nuclear.
That's all pretty much a moot point, though, since Iran hasn't even pretended that they were ever going to consider a nuclear propulsion program, so they can hardly use it as a fig leaf justification for enrichment.
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