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Communication Dans Un Congrès Année : 2017

The TAF-ID database Application calculations to severe accidents and irradiated fuel

Résumé

To support safety improvement and life extension for Generation II-III reactors, and the design of the Generation IV reactors there is a need of thermodynamic experimental data and modelling. These are needed to describe the complex phenomena occurring during the normal operating conditions as well as during accidental scenarios of a nuclear power plant.In 2013, the OECD-NEA Thermodynamics of Advanced Fuels International database (TAF-ID) project was started. The main objective of the TAF-ID project is to assure a comprehensive and reliable international thermodynamic Calphad-type database for the calculation of phase diagram and thermodynamic properties of fuels. This includes minor actinides (Am, Np), fission products (Cs, I, Ba, Sr, Mo, Zr, lanthanides, metallic fission products) and structural materials (steel, Zr alloy, B4C, SiC, concrete).In this work, the current version of the database has been used to investigate the thermodynamics and phase relations of corium, a partly or fully melted mixture formed during a severe accident mainly composed of nuclear fuel, cladding and structural materials. First, calculations have been compared to experimental results obtained in large scale facilities dedicated to severe accidents studies. A good agreement has been obtained. Then calculations have been performed to follow the partition of elements in each phase as a function of temperature and corium composition. For this task, representative corium compositions found in literature have been used. These calculations allow to study the role of key elements, such as Pu, in the very high temperature behavior of corium. In parallel, thermodynamic calculations have been performed to study the effect of fission products within the nuclear fuel matrix. These calculations help the understanding of UO2 based fuel behavior after irradiation. The formation of metallic phases within the oxide fuel can be predicted. Parameters such as the oxygen potential may be varied to investigate different scenarios.
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Dates et versions

hal-02418154 , version 1 (18-12-2019)

Identifiants

  • HAL Id : hal-02418154 , version 1

Citer

A. Quaini, B. Lindahl, E. Geiger, C. Gueneau, S. Gossé. The TAF-ID database Application calculations to severe accidents and irradiated fuel. NuFuel 2017, Sep 2017, Lecco, Italy. ⟨hal-02418154⟩

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