The presurizer is one of main equipments of PWR Nuclear Power Plant. The heat transfer mechanism will change with temperature’s increasing when the steam with high temperature and high pressure condensates as it sprays into the in-containment refueling water storage tank (IRWST), which will be detrimental to the safety of the reactor. In this study, the flow field and heat transfer characteristics are simulated by means of professional CFD software with k-ε turbulence model and Particle modle when the steam sprays into IRWST through the sprayer. The results show thermal changes of water and steam.

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