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The US, Russia, Great Britain, France, China and (recently) India have nuclear submarines.
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From Wikipedia: Today, six countries deploy some form of nuclear-powered strategic submarines: the United States, Russia, France, the United Kingdom, People's Republic of China, and India Several other countries, including Argentina and Brazil, have ongoing projects in different phases to build nuclear-powered submarines.
As of end of 2010, the Russian Navy included 12 strategic submarines of four different types. The submarines can carry 160 sea-launched ballistic missiles (SLBMs) that can carry 576 nuclear warheads.
The PLA navy has more than 225,000 personnel and is thought to have as many as 70 submarines, 10 of them nuclear-powered
USA has the most nuclear submarines
230
170
nearly 155
Argentina had diesel-electric submarines while the British had nuclear-powered submarines.
1, 200,000 Soldiers 30 Warships 11 Submarines.
Reactors power submarines and many surface ships. Nuclear weapons.