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|[[File:NuclearReactor.png|center|400px300px]]| style="height:20px; width:200px300px; text-align:left;" |In '''nuclear fission reactors''' [[Unstable Isotope|unstable isotope]]s are in [[Fuel Rod|fuel rods]]
The [[Fuel Rod|fuel rods]] in a '''nuclear reactor''' are slim to allow [[neutron]]s to escape the [[Fuel Rod|fuel rods]] easily. This prevents a single [[Fuel Rod|fuel rod]] from sustaining a [[Nuclear Chain Reaction|chain reaction]].