False. Nuclear fission or whatever the reactions are called creates high amounts of radiation, which are dangerous, especially if around for a long time Nuclear energy is VERY good though.
Nuclear energy is released due to nuclear reaction and is mostly used to generate nuclear power.
Even though nuclear power comes with many benefits it has many negative consequences associated with it. Some of the mare as follows :
the radioactive waste that is generated possesses a great risk for mankind.
There is the release of gaseous and liquid radioactive substances into the environment by nuclear power plants. These substances are carcinogenic in nature.