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2 Agence Nationale pour la gestion des Dechets RAdioactifs (ANDRA),1-7, rue Jean Monnet, 92298 Châtenay-Malabry Cedex, France Abstract. In the scope of the studies car ried out on the geological disposal of radioacti ve wastes, it is essential to assess the migration behaviour of long lived radionuclides as a function of the physicochemical conditions (pH, redox potential, tempera- ture, pressure, ...), the nature of the host rocks and the chemical composition of the under ground waters. In this stud y, we ha ve considered the case of selenium which is an element of importance because of its long li ved under its 79 Se isotope . A review is first performed on the behaviour of selenium from a vailable studies in natural systems in considering particular ly the inorganic Se forms. Later on, these results are transposed to the physicochemical conditions occur ring in the vicinity of a geo - logical repository. The most stable forms in this context would be Se(-II), Se(0) and Se(IV). Several parameters can govern the mobility of these Se species such as the pH, the potential of the water and the presence of solid phases containing iron, man- ganese or aluminium (oxy)hydroxides on which Se(IV) can be sorbed. Selenide and selenite mobility can also be retarded b y precipitation reactions. This is particular ly true for Se(-II) in presence of iron(II) and sulfides. The hypothetical presence of microorganisms is also considered because of its importance on the f ate of the Se species.

analusis

Assessing the speciation and the biogeochemical processes affecting the mobility of selenium from a geological repository of radioactive wastesto the biosphere