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

摘要

An analytical model for aerosol behavior in gas bubbles is developed for interpretation of the process, in which gas bubbles move from an outlet nozzle simulating the pin bundle toward the surface of upper liquid pool. The model deals with aerosol depletion in large and small bubbles in a split/coalescence zone above a release zone in which globule bubbles are generated, and treats formation of liquid droplets and aerosol coagulation onto them in the split/coalescence zone. Input data are prepared by other analytical models for a foregoing process, in which released gas move from a location of fuel failure toward the outlet of pin bundle. Experimental results obtained with use of a large-scaled water pool are compared with those calculated with the model and input data. The comparison shows that the developed model is capable of describing the aerosol depletion in bubbles transferring from the release location in the pin bundle to the free surface of the coolant pool.