Análise da influência do revestimento na atenuação do perfil de decaimento de calor do combustível nuclear queimado disposto em piscina de resfriamento

Abstract

The analysis of the thermal behavior of burnt nuclear fuels deposited in swimming pools is important for understanding the variation in water temperature, both for pool design purposes and for possible failures in the water cooling system. In this work, studies were carried out based on numerical simulations using the Ansys CFX platform, in which the influence of the zircaloy coating of the rod on the attenuation of the decay heat profile of the burned fuel of a Pressurized Water Reactor (PWR) type was estimated, which was discharged and placed in a cooling pool. In the mathematical modeling, the real geometry of a fuel rod totally immersed in water was considered, with adiabatic boundary conditions on the pool walls and with heat exchange at the top, between the water and the environment. The results show that the zircaloy coating attenuates the intensity of the heat emitted by the burned fuel by approximately 10%.