ELI5: Explain Like I'm 5

Nuclear blackout

A nuclear blackout is an event that happens when a nuclear power plant has an emergency and all of its energy stops working. This means that all the lights go out, the electricity stops working, and all of the machines that require electricity (like TVs and computers) aren't able to work. A nuclear blackout is very serious and can last for a very long time, so it's important to be prepared for one.