Based on the statements provided, none of them are false. All of the statements about nuclear fission are true:
- Nuclear fission releases a huge amount of energy.
- Nuclear fission involves one large atom splitting into two smaller atoms.
- Nuclear fission is used to produce electricity at nuclear power plants.
- Nuclear fission takes place in the nucleus of an atom.
If you're looking for false statements, it might be that you meant to phrase something differently or that there are other statements available for evaluation. Please provide any additional statements or clarifications if needed!