Question

how is the radioactive energy removed from a nuclear power plants spent fuel rods?
the energy is only removed when it changes to a safer form.
the fuel rods are scrubbed clean, removing the energy.
the fuel rods are destroyed, removing the energy.

Explanation:

Radioactive energy in spent fuel rods is not removed by scrubbing or destroying the rods. Radioactive decay is a natural process where the unstable nuclei of radioactive materials transform over time. As they decay, they release radiation (a form of energy) and eventually transform into more stable (safer) forms. So, the energy (in the form of radiation) is only removed (in the sense that the high - level radioactive state is no longer present) when the radioactive materials change to a safer (more stable) form through radioactive decay.

Answer:

The energy is only removed when it changes to a safer form.