Depletion of aerosols released under simulated conditions of fuel failure in LMFRs: development of analytical model in fuel coolant channel

摘要

An analytical model for aerosol behavior in gas bubbles is developed for interpretation of the process, in which gas bubbles move from a failed location toward an outlet of a coolant channel. Using the analytical model, input data for an analysis of a subsequent late process have been propared, in which the gas bubbles rise from the outlet of the coolant channel to a water surface, splitting and coalescing through the water pool. The model for aerosol behavior can deal with gas release into the coolant channel, droplet formation by entrainment to gas flow in the channel, aerosol formation in the gas, and aerosol depletion by interaction of aerosols with droplets. Heterogeneous nucleation in the aerosol formation and interaction of size-distributed aerosols with droplets are incorporated in the model as well as the formation and interaction of single-size aerosols. The decontamination factor obtained from the model agrees with the previous water experiment at a region just above the coolant channel. The analytical model is shown to be capable of describing the aerosol depletion in the process.