170
The PLA navy has more than 225,000 personnel and is thought to have as many as 70 submarines, 10 of them nuclear-powered
230
nearly 155
Reactors power submarines and many surface ships. Nuclear weapons.
Most submarines now have a single nuclear reactor. Some smaller, coastal submarines have a single diesel.
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.
Nuclear energy is not gathered or created. There is a saying to go along with this: Energy cannot be created or destroyed, only changed in form. That saying is called the Law of the Conservation of Energy. Nuclear is a type of potential energy so this concept applies to it. There are many ways nuclear energy can be used. Lets say submarines. Most people have heard of the nuclear powered submarines. They can stay under water for a long time because they have basically unlimited energy. The submarines are powered by a nuclear reactor causing a series of nuclear reactions. The submarine uses the nuclear reactions as power. Generally it will get converted to mechanical or electrical energy (both types of Kinetic energy).
Nuclear power plants are very large fixed installations on land. There are many reactors however in the US navy ships and submarines
At times it sure seemed like a lot more than there actually were, but counting U.S. NATO, and Soviet submarines, around 300. That includes both attack and missile submarines, DE and Nuclear.
As of my last update in October 2023, Russia has approximately 11 operational nuclear-powered submarines. This number includes several classes, such as the Borei and Delta IV submarines, which are capable of carrying ballistic missiles. The exact number may vary due to ongoing developments and maintenance in the Russian Navy.
As of October 2023, the countries known to possess nuclear submarines include the United States, Russia, China, France, and the United Kingdom. The United States has around 68 operational nuclear submarines, while Russia has approximately 60. China operates around 12, and both France and the United Kingdom have about 10 each. India is also developing its nuclear submarine capabilities and has launched its first operational vessel.
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.