Analysis of the Range of Applicability of Thermodynamic Calculations in the Engineering of Nitride Fuel Elements


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The domains of applicability of thermodynamic calculations in the engineering of nitride fuel are analyzed. Characteristic values of the following parameters, which affect directly the concentration equilibration time, are estimated: nuclide production rate; characteristic times to local equilibrium in the considered temperature range; characteristic time needed for a stationary temperature profile to be established; characteristic time needed for a quasi-stationary concentration field to be established on a scale comparable to the size of a fuel pellet. It is demonstrated that equilibrium thermodynamic calculations are suitable for estimating the chemical and phase composition of fuel. However, a two-layer kinetic model should be developed in order to characterize the transport processes in condensed and gaseous phases. The process of diffusive transport needs to be taken into account in order to determine the composition in the hot region at the center of a fuel element.

Sobre autores

A. Ivanov

National Research Centre Kurchatov Institute

Autor responsável pela correspondência
Email: asi.kiae@gmail.com
Rússia, pl. Akademika Kurchatova 1, Moscow, 123182

A. Rusinkevich

National Research Centre Kurchatov Institute

Email: asi.kiae@gmail.com
Rússia, pl. Akademika Kurchatova 1, Moscow, 123182

G. Belov

National Research Centre Kurchatov Institute

Email: asi.kiae@gmail.com
Rússia, pl. Akademika Kurchatova 1, Moscow, 123182

Yu. Ivanov

Bochvar High-Technology Scientific Research Institute for Inorganic Materials

Email: asi.kiae@gmail.com
Rússia, ul. Rogova 5a, Moscow, 123098

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