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210 Po, a highly toxic element with strong volatility, is one of the main source terms of a Gen-IV lead-cooled fast reactor (LFR). Therefore, the radioactive safety caused by  210 Po has become an important topic in LFR-related research. In order to simulate the behavior of  210 Po in an LFR, this work developed a multi-physics model of an LFR from the perspective of radioactive transport. Considering the effects of nuclide decay, cover gas leakage, containment ventilation, and Po aerosol deposition, a comprehensive simulation was carried out to evaluate the sensitivity of those effects on the  210 Po distribution in detail. Preliminary results indicate that during normal operation, most of the  210 Po in the LBE exist in the form of PbPo, and around 10 –9  of  210 Po could evaporate from the LBE into the cover gas, and then further leak into the containment. In addition, even if the leakage rate of  210 Po in the cover gas into the containment is maintained at 5‰ per day, due to the deposition of Po aerosol, the  210 Po contamination on the inner surface of the containment is still below the radioactivity concentration limits.

Multi-Physics Model Development for Polonium Transport Behavior in a Lead-Cooled Fast Reactor