burnup

[burn-uhp]
noun
the nuclear fuel consumed in a reactor, often measured as a percentage of the atoms of fuel that have undergone fission.

Origin:
noun use of the verb phrase burn up

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
burnup

noun
1. a high-speed motorcycle race on a public road 
2. the amount of fuel used up (as in a nuclear reactor) 
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
The concept of taking credit for the reduction in reactivity due to fuel burnup is commonly referred to as burnup credit.
Surplus weapon-grade fissile materials can be profitably and irrevocably demilitarized by burnup in existing nuclear reactors.
Fuel provides head-room for additional power uprates and high burnup limits.
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