Cálculo de reconstrução da distribuição de potência pino a pino usando máxima entropia

Abstract

In this research was develop a method for reconstruction pin to pin of the heterogeneous power density distribution using the method of maximum entropy (MME) and the results from a rough mesh nodal calculation. The MME requires a discretization of the neutrons diffusion equation in mesh with a dimension of a fuel cell (pine) as well flow distribution, normalized to one, for each face of a Fuel Element (FE). In this essay, the flow distributions on the faces of a Fuel Element are obtained by MME together with an analytical solution of the neutrons diffusion equation on the homogenized FE. The heterogeneous power density distribution is obtained by a modulation method that is the result of the form function of power and homogenous power density distribution of the homogenized EC. That homogenous power density distribution is obtained using MME and the solution of the neutrons diffusion equation discretized in mesh with a dimension of a fuel cell. The results obtained by this method of reconstruction, when compared with the benchmark ones, reached 11.3% as the highest deviation in a cell from the periphery of the Fuel Element. The cells from the other FE of that reactor reached an extremely lower deviation when compared with the highest one.