Large-scale modelling of T-M phenomena from underground deposition of the spent nuclear fuel

The paper is devoted to the use of mathematical modelling for analysis of the thermo-mechanical (T-M) phenomena, which are relevant for the assessment of underground repositories of the spent nuclear fuel. Particularly, two model problems are analysed concerning the Swedish KBS3 concept and its realization in Àspõ prototype repository and a concept of underground interim storage Skalka in the Czech Republic. We shall discuss the formulation, numerical methods, computer implementation and describe some computed results and computing experience. The Àspõ prototype repository model serves as an example of large-scale 3D modelling with the time scale 50 years and space discretization with about 2.5 and 7.5 million of degrees of freedom for the temperatures and displacements, respectively. The Skalka model shows modelling with the presence of more complicated heat transfer mechanisms.