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At the present time, it is considered that the phenomenon of particle binding on the surface of the fuel elements directly leads to the formation of the structures of constant density. Here, the particle binding stage is visualized as the crystallization of the dissolved substance (form) and dehydration of the dispersed particles (d.p.) on the surface [I]. The following observations (that are useful for ensuring reliable operation of the fuel elements) reflect this concept: safe operation of the fuel elements is determined only by the effect of the total thickness of the deposit (precipitate) layer; the coefficient of thermal conductivity of the deposits remains constant.