The current total is 71 active and 2 reserve as of May 2011 -
Commissioned
14 SSBN's (Ballistic Missile Submarines)
4 SSGN's (Cruise Missile Submarines, converted SSBN's)
53 SSN's (Fast-Attack Submarines)
Reserve
2 SSN's (688-class Fast-Attacks)
The USS California, the newest Virginia-class SSN, is scheduled for commissioning in October 2011, with another 4 on the way.
The US, Russia, Great Britain, France, China and (recently) India have nuclear submarines.
The PLA navy has more than 225,000 personnel and is thought to have as many as 70 submarines, 10 of them nuclear-powered
Nuclear power plants are very large fixed installations on land. There are many reactors however in the US navy ships and submarines
230
170
USA has the most nuclear submarines
nearly 155
Argentina had diesel-electric submarines while the British had nuclear-powered submarines.
Reactors power submarines and many surface ships. Nuclear weapons.
As of October 2023, the United States has 14 Ohio-class ballistic missile submarines (SSBNs). These submarines serve as a key component of the U.S. nuclear deterrent strategy, carrying Trident II (D5) ballistic missiles. The Ohio-class submarines are designed for stealth and long-duration missions, ensuring a continuous at-sea deterrent capability.
During WW2 the US Navy built 126 submarines.
52 US submarines were lost in WW2. This was about 1 in every 5 submarines that the US had in WW2