Transport-reaction model of a deep repository for radioactive waste

Spent fuel from nuclear power plants contains highly active radioisotopes in the basic matrix. Radioisotopes with a short half-life decay during the storage of fuel cells directly in nuclear power plants; for radioisotopes with a longer half-life, their safe storage for thousands to millions of years must be ensured. Therefore, a deep repository in a stable rock environment is chosen as an acceptable solution. The basic assessment of the stability of the rock environment during the penetration of groundwater to the repository is enabled by a transport-reaction model. It simulates the interaction of a fuel cell matrix, which consists of uranium dioxide, with groundwater and allows to assess the transport, changes in phase composition and sorption or desorption of transported radionuclides in the rock environment. The model was processed in the program Geochemist's Workbench ver. 12.0.4. (authors)