ELI5: Explain Like I'm 5

Combined nuclear and steam propulsion

Okay, so let's imagine that you have a really big boat like a cruise ship, and this boat needs to move really fast and really far. But the boat needs something to make it move, kind of like how when you ride your bike, you have to pedal to make it move.

But this boat is too big for pedals, so scientists came up with something really cool called combined nuclear and steam propulsion. Basically, they use two things to make the boat move really fast: nuclear power and steam.

Nuclear power is like a super-strong battery that never runs out of power. It's kind of like the batteries in your toys, but much, much stronger. The nuclear power goes into a thing called a reactor, which is like a really strong furnace.

Inside the reactor, scientists use something called uranium to make heat. This heat makes the water around the reactor really hot, like when you heat up water to take a bath.

This super-hot water then turns into steam, which is like a big cloud that you can see. The steam then goes into something called a turbine, which is like a really big fan. As the steam goes through the turbine, it makes the turbine spin really fast, kind of like a pinwheel in the wind.

The spinning turbine then gives the boat lots of energy, which makes it go really, really fast! And because the nuclear power never runs out, the boat can keep moving for a really, really long time.

So that's basically what combined nuclear and steam propulsion is. It's using nuclear power to heat up water and make steam, and then using that steam to make a turbine spin and give a boat lots of energy to move really fast for a really long time.