Aerosols are the main leakage pathway of radioactive materials in nuclear power plants during normal operation and severe accidents.In this thesis,a numerical simulation study is carried out based on the Discrete Phase Model(DPM)of the Euler-Lagrange method in FLUENT for the aerosol transport characteristics in the containment of a lead-based reactor.The simulation results show that the number of aerosol small-size particles in the static flow field is uniformly distributed by Brownian force on different walls,and the number of large-size particles is unevenly distributed by gravity on different walls.Meanwhile,the applicability and accuracy of the modeling approach in the containment environment are verified by using the settling phase of the PHEBUS FPT0 experiment as a benchmark condition.Finally,based on a two-dimensional axisymmetric simplified model of a typical containment,the aerosol migration and settling processes from the core surface to the containment are simulated under the normal operating conditions of the reactor.It is found that under normal operating conditions,0.1 μm aerosols will migrate widely with the flow line and be captured near the junction of the upper and vertical containment walls,while 3 μm and 10 μm aerosols will be retained near the lower containment wall or settle to the lower containment wall.The preliminary conclusions based on this modeling study can provide reference for the subsequent aerosol force analysis experiments and aerosol migration experiments in containment.
AerosolDiscrete phase model(DPM)ContainmentPressurized water reactorLead-based reactor
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