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When a breach occurs in a reactor and causes a severe accident, the high-temperature hydrogen gas inside the primary loop piping will be released into the large space of the containment, which will possibly seriously endanger the integrity of the containment.In order to study the gas transport behavior inside the containment after a severe accident, this paper adopts numerical simulation to establish a full-scale two-dimensional model of the containment, and comprehensively analyses the effects of different factors on the gas transport inside the containment driven by high-temperature gas from the breach and heat exchangers.The results show that factors such as breach size and direction, hydrogen concentration, and condensation on the heat exchanger surface affect the gas transport.When the gas injection velocity of the breach is large, the momentum factor plays a dominant role in hydrogen transportation; when the gas flow rate of the breach is small, the buoyancy factor has a more significant effect on hydrogen distribution.The settling effect caused by steam condensation on the surface of heat exchangers in the containment will affect the direction of flow of surrounding gas to some extent.In addition, increasing the opening of the compartment where the breach is located allows for a more even distribution of hydrogen.
Liu et al. (Mon,) studied this question.