from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A measure of the consumption of fuel in a nuclear reactor.

from the GNU version of the Collaborative International Dictionary of English

  • n. the amount of fuel used up (as in a nuclear reactor).

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the amount of fuel used up (as in a nuclear reactor)
  • n. a high-speed motorcycle race on a public road


Sorry, no etymologies found.


  • For how the energetic cycles of that power the cell emerged, that alone has only entertained many interesting possibilities, hot core and cooler oceans, reducing ocean/sea floor/land and more oxidizing atmosphere, molecules generated by incubation in space and subsequent infall to earth, reacting with terrestrial molecules, photochemistry (from a uv-rich sun), concentration gradients of a wide variety of sorts, reactions of molecules produced by energetic processes involving meteor impact/burnup.

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  • An increase in fuel enrichment from 2% to 2.4% to maintain fuel burnup with an increase in neutron absorption (i.e., less reliance on cooling water for this function).

    Light water graphite reactor (RBMK)

  • Type Composition Origin Use Reactor-grade from high-burnup fuel 55-70% Pu-239, 19% Pu-240, typically about 30% non-fissile Comprises about 1% of spent fuel from normal operation of civil nuclear reactors used for electricity generation As ingredient (c5%) of MOX fuel for normal reactor Weapons-grade Pu-239 with


  • As reactor operators seek to burn fuel harder and longer, increasing burnup from around 30,000 MW days per tonne a few years ago to over 50,000 MWd/t now, MOX use becomes more attractive.

    Mixed oxide fuel (MOX)

  • Authorisation for enrichment up to 10% was sought - most enrichment plants operate up to 5% U-235 product, which is becoming a serious constraint as reactor fuel burnup increases.

    Uranium enrichment

  • All these considerations mean that only RepU from low-enriched, low-burnup used fuel is normally recycled directly through an enrichment plant.

    Uranium enrichment

  • The plutonium isotopic composition of used MOX fuel at 45 GWd/tU burnup is about 37% 239Pu, 32% 240Pu, 16% 241Pu, 12% 242Pu and 4% 238Pu.

    Mixed oxide fuel (MOX)

  • Two or three categories are possible: degraded Pu (e.g., in high-burnup fuel), low-grade Pu (e.g., separated from spent fuel of normal burnup), and high-grade Pu (e.g., from weapons or low-burnup fuel).

    Nuclear safeguards (non-proliferation)

  • The reactivity control system is passive, using lithium expansion modules (LEM) which give burnup compensation, partial load operation, and negative reactivity feedback.

    Fast neutron reactors (FBR)

  • As well as many passive safety features, the nuclear reactor design is simpler overall and uses high-burnup fuels enriched to 3.54%, giving it refuelling intervals of up to 24 months.

    Advanced nuclear power reactors


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