Decommissioning strategy for liquid low-level radioactive waste surface storage water reservoir.

The Techa Cascade of water reservoirs (TCR) is one of the most environmentally challenging facilities resulted from FSUE "PA "Mayak" operations. Its reservoirs hold over 360 mln m3 of liquid radioactive waste with a total activity of some 5 × 1015 Bq. A set of actions implemented under a special State program involving the development of a strategic plan aimed at complete elimination of TCR challenges (Strategic Master-Plan for the Techa Cascade of water reservoirs) resulted in considerable reduction of potential hazards associated with this facility. The paper summarizes the key elements of this master-plan: defining TCR final state, feasibility study of the main strategies aimed at its attainment, evaluation of relevant long-term decommissioning strategy, development of computational tools enabling the long-term forecast of TCR behavior depending on various engineering solutions and different weather conditions.

[The assessment of the radiation quality of marine sediments].

The processes of ecosystems secondary pollution owing to interaction with bottom sediment are analyzed. Long-run consequences of contamination are investigated using the model describing the radionuclide migration dynamic in bottom sediment on account of transport processes due to diffusion and convection. Intricate bottom sediment forming procedure in water bodies of this kind is allowed. Model structure, numerical technique solution generation and analysis of results are represented.

[Relation between radiation safety criteria of human and the environment].

System approach is used for developing of procedures of complex radiation safety of human and the environment. Relation between radiation safety criteria of human and the environment is considered by the example of different strategies of water bodies using. It is demonstrated that as to water bodies (though the methodology and conclusions are correct to terrestrial ecosystems too) observance of human radiation safety standards on condition that environment resources are used unrestrictedly (considering radiation factor) is necessary and sufficient to protection of objects of the environment. It allows reaching compromise between anthropocentric and ecological approaches to radiation protection of the environment from general biospheric principles.