Po-containing molecules in fusion and fission reactors

Merlijn A.J. Mertens, Alexander Aerts, Ivan Infante, Jörg Neuhausen, Stefaan Cottenier

    Research outputpeer-review

    Abstract

    Fission and fusion reactors can only play a role in the future energy landscape if they are inherently safe by design. For some reactor concepts, a major remaining issue is the undesired production of radiotoxic 210Po. To filter out the volatile Po species, information on their molecular composition is needed. An experimental characterization is very challenging due to the large required amount of radioactive Po. An alternative quantum chemistry approach was taken to predict the temperature-dependent stability of relevant diatomic Po-containing molecules. Experimental data on lighter analogue molecules was used to establish a well-founded methodology. The relative occurrence of the Po species was estimated in the cover gas of (i) the lead-bismuth eutectic coolant in the accelerator-driven MYRRHA fission reactor and (ii) the Pb-Li eutectic tritium breeder in the DEMO fusion reactor. In both systems, Po is found to occur mainly as PbPo molecules and atomic Po.
    Original languageEnglish
    Pages (from-to)2879-2884
    Number of pages6
    JournalThe journal of physical chemistry letters
    Volume10
    Issue number11
    DOIs
    StatePublished - 6 Jun 2019

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