Explain why spent nuclear fuel rods have to be treated as hazardous waste.

The spent nuclear fuel rods are have to be treated as a hazardous waste because it takes almost 10 years to cool down and it is harmful at that time at well. It should be handled with care.

The rods that is once used can be refilled with the radioactive material which is highly explosive.

It takes almost 10, 000 years to cool down the nuclear fuel rods so it is equally harmful so it is kept in water for a very long period of time.