Mathematlcal Modelling of the Impurities Concentration Processes into CANDU Steam Generator Crevices

摘要

The major goal of this paper was the development of a mathematical model for the calculation of the impurities concentrations (Na~+, Cl, Fe~+) into crevices. This model considers all the processes that interfere in the impurities concentration mechanism achieved into the crevice, but it also makes some assumptions for the easy solving of mathematical equations. Because in the steam generator the measurement of the impurities concentration and/or deposition in the crevices solutions is not achievable, one cannot estimate the corrosion intensity inside these spaces. The mathematical model presented in this paper may predict the impurities concentration in the crevices Based on the results obtained in the study of corrosion, the scientist may appreciate the corrosion intensity of the crevices materials or may draw up an experimental program, which could lead at immediate results. The predictive quality of the model may contribute to the choice of new design solutions, development of new alloys and of material selection criteria.