ASTM WK46601

    New Test Method for The Determination of the Oxygen to Metal (O/M) Ratio in Sintered Mixed Oxides ((U, Pu)O2) Pellets by Gravimetry

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    Developed by Subcommittee: C26.05 | Committee C26 | Contact Staff Manager


    1. Scope

    This practice is an alternative method to test method C698 for the determination of the oxygen-to-metal atom ratio (O/M) in sintered mixed oxide fuel (MOX) pellets. The method presented in test method C698 is a one-step thermogravimetric method for determining O/M ratio in sintered MOX powders and pellets. As stated in ASTM C 698, thermogravimetric methods using a two-step heating cycle are also satisfactory. The method presented in this test method is a two-step heating cycle method. This practice is applicable to sintered MOX pellets containing up to 10 weight percent PuO2.

    This standard is needed because it is a method used in large scale MOX fuel fabrication facilities. It will be used to measure O/M ratio in MOX fuel fabricated in the MOX fuel fabrication facility on the Savannah River Site.


    plutonium; thermal analysis; gravimetry; uranium; MOX; oxygen to metal (O/M) ratio

    The title and scope are in draft form and are under development within this ASTM Committee.

    Citing ASTM Standards
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    Work Item Status

    Date Initiated:

    Technical Contact:
    Ben Karmiol


    C26.05 (14-03)

    Negative Votes Need Resolution


    C26 (15-01)

    Ballot Item Approved as C1817-2015 and Pending Publication