In short, a nuclear power plant is a large boiler. Boiling water heated up to 270 degrees Celsius goes to the reactor where it cools fuel rods with pellets of uranium inside. It goes out with a temperature of 276 degrees Celsius. Part of this water evaporates and the steam rotates the turbines. This is how electricity is produced.
Let's visit the only nuclear power plant built under the conditions of the permafrost. It is located in Bilibino, the Chukchi Autonomous District.