Análise da influência de parâmetros da rocha no perfil de temperatura da superfície do canister em repositórios geológicos

Abstract

The determination of the heat of decay profile (PCD) of burned nuclear fuels (CNQ) is essential for thermal analysis studies of the storage conditions of these fuels. In this work, studies are carried out in order to understand the influence of rock layer thickness on the surface temperature of a CNQ canister containing four intact elements of the Pressurized Water Reactor (PWR) type, under conditions of geological deposition. The influence of soil temperature is also evaluated, which depends on the depth of the geological repository, considering the constant geothermal gradient. The study was based on numerical simulations performed through the Ansys platform, considering the CNQ stored in a standard canister and surrounded by rocks. The results show that the plateau reached by the temperature at the surface of the canister, as well as the rate of its decrease, is dependent on the thickness of the rock layer and the temperature at the bottom and top of the geological repository.