Polonium behavior following a vacuum window rupture in a lead-bismuth eutectic based accelerator driven system

Erik Karlsson, Jörg Neuhausen, Alexander Aerts, Ivan Danilov, Robert Eichler, Andreas Türler, Alexander Vögele

    Research outputpeer-review


    Accelerator driven fast nuclear reactors cooled by lead-bismuth eutectic (LBE) are developed for transmuting long-lived radionuclides in spent nuclear fuel. Due to the nature of the coolant, operating the reactor will result in a production of ²¹⁰Po by neutron capture. Understanding the behavior of this highly radiotoxic nuclide in the event of a failure of the window separating the evacuated proton beam guide from the reactor core is required for safety assessments. The present work aims at acquiring this knowledge by studying the evaporation of polonium from neutron-irradiated LBE and its deposition in a scaled down model of the beam tube. Experimental results along with Monte Carlo simulations indicate that polonium adsorbs as a single species with an adsorption enthalpy of approximately −156 kJ/mol.
    Original languageEnglish
    Article number109551
    Pages (from-to)1-7
    Number of pages7
    JournalApplied Radiation and Isotopes
    StatePublished - 1 Feb 2021

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