1. The nuclear power plant enables nuclear submarines to sail continuously under water for a long time. Nuclear power plants use nuclear energy as energy source and do not need air during nuclear fission. Therefore, nuclear submarines can sail continuously underwater for a long time, and their concealment far exceeds that of conventional power submarines.
2. Endurance is not limited. Nuclear reactors can operate for several years or even decades with a single charge. For example, the S9G reactor used on the "Virginia" class submarine under construction in the United States has a lifespan of up to 33 years. So that the nuclear submarine has "unlimited" endurance.
3. High power. The ship-powered reactors currently in operation have a single reactor power between 30 and 300 megawatts (MW). Some nuclear-powered ships (such as aircraft carriers) are equipped with multiple reactors. The powerful power allows these giants to reach 20-50 knots. Sailing at high speeds.