01-32U

Main forms of nuclear fuel storage in the object "Shelter" are considered. Detailed analysis of experimental investigation data of physico-chemical properties of fuel-containing masses are performed. The problem of water in the object "Shelter" is also considered. The state of the aqueous solutions, their interaction with the nuclear fuel, the role of radionuclides in processes of radiolysis, complex formation and mineral growth on a surface of the fuel-containing masses are analysed. Peculiarities of processes occurring in small volumes and micropores of lava-like materials are described. Numerical calculations of diffusion coefficients and rate constants of chemical reactions of ions and radicals are carried out on the basis of ion model for aqueous solutions.