Assertion: fuel | /r/HasProperty | based on the metal oxide
Facets:
value: for fission reactors
type: TRANSITIVE-OBJECT
value: usually
type: DEGREE
Source sentences:
text: For fission reactors, the fuel (typically based on uranium) is usually based on the metal oxide; the oxides are used rather than the metals themselves because the oxide melting point is much higher than that of the metal and because it cannot burn, being already in the oxidized state.