Abstract
A linearized model for the pressurizer of the Safe Integral Reactor (SIR) is developed. The mathematical model derived from the general conservation equations includes all the important thermal-hydraulic processes occurring in the pressurizer. These processes are spray condensation, interfacial condensation, vapour rise, condensate fall, and heat tranfer from heaters. Also, the model takes into account some special functional features of the passive spray and the fluidic diodes. The insurge and outsurge events are modelled separately and the pressurizer response to insurge and outsurge flows are compared for the SIR, the H. Robinson, and the Shippingport reactors. It is concluded that the SIR passive spray concept is not as favourable as valved spray in inverting the pressure rise during an insurge flow.
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