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Density of UO2?

  1. Nov 14, 2014 #1
    Hi there,

    I´m just finishing an input file for MCNP5 and I can´t find a value of density for UO2 enriched to 3,25% - 3,6%.

    Does anyone know it or know where I can find it?

    Thanks in advance!

    (P.D.: wikipedia is not my friend... )
  2. jcsd
  3. Nov 14, 2014 #2


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  4. Nov 14, 2014 #3


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    The theoretical density (TD, 100% dense, or no porosity) of UO2 is approximately 10.96 to 10.98 g/cm3, or 10960 to 10980 kg/m3. In practice, there is always some porosity in a polycrystalline pellet. For a few decades, in LWR fuel, we have used about 95% dense UO2 (10410 kg/m3), but some fuel is made with densities > 95%, and often in the range of 96 to 97% TD (10520 to 10630 kg/m3), and in some cases in might go up to close to 98% TD. It depends on the reactor and cycle/core design.
  5. Nov 14, 2014 #4

    I meant that I had seen it and that I don´t trust wikipedia anymore (for this kind of data, even though this time is approximately right)
    Last edited: Nov 14, 2014
  6. Nov 14, 2014 #5


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    If one is doing work or school work, one should go to a text book or other reliable source.

    For nuclear fuel properties, one can use MATPRO.

    I'll post some links to some technical documents once the websites are up.

    The IAEA and INL have changed their websites, so old link may not be viable anymore.

    IAEA Technical Documents (TECDOCs) are available here:

    See -

    Specifically - http://www-pub.iaea.org/books/IAEAB...Light-Water-Reactors-and-Heavy-Water-Reactors
    Section Density of Solid UO2
    Last edited: Nov 15, 2014
  7. Nov 15, 2014 #6
    I´ll check it out.

    Thank you again.
  8. Nov 15, 2014 #7


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