Abstract
To simulate fuel rod thermal destruction, analytical approaches were developed. Approaches are based on solving the Stefan problem and solving the equation of motion of the molten materials. The paper contains a brief description of the ways to obtain analytical solutions and applicability limits of the solutions. Calculation of the mass of the melt that left the central part of the fuel rod is presented. Proposed analytical solutions can be used only to simulate the first stage of the accidents from melting inception of the cladding to destruction of the whole fuel assembly.
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