= Active fuel length
{wiki=Active_fuel_length}
Active fuel length usually refers to the portion of a nuclear reactor's fuel that is actively participating in the fission process. In a nuclear reactor, fuel rods contain nuclear fuel (typically enriched uranium or plutonium), and the length of the fuel that is effectively contributing to the chain reactions can be critical for determining the reactor's performance and efficiency. The concept is essential in the design and operation of reactors, as it affects factors like the reactor's power output, neutron economy, and overall lifecycle.
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