Modelling of crud growth phenomena on PWR fuel rods under nucleate boiling conditions - Département Recherches Subatomiques Accéder directement au contenu
Communication Dans Un Congrès Année : 2012

Modelling of crud growth phenomena on PWR fuel rods under nucleate boiling conditions

Résumé

PWR primary circuit materials undergo general corrosion leading to a release of metallic element release and subsequent process of particle deposition and ion precipitation on the primary circuit surfaces. The species accumulated on fuel rods are activated by neutron flux. Consequently, crud erosion and dissolution induce primary coolant contamination. In French PWRs, 58 Co volume activity is generally low and almost constant (< 30 MBq.m-3) throughout an ordinary operating cycle. In some specific cases, a significant increase in volume activity is observed after the middle of a cycle (100-1000 MBq.m-3 for 58 Co) when conditions for nucleate boiling are locally reached in certain fuel assemblies. Indeed, it is well known that nucleate boiling intensifies the deposition process. The thickness of the crud layer can reach some micrometers in non-boiling areas, whereas it can reach 100 micrometers in boiling areas.
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cea-04475789 , version 1 (23-02-2024)

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Paternité

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  • HAL Id : cea-04475789 , version 1

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Alexandre Ferrer, Frédéric Dacquait, B. J. P. Gall, Gilles Ranchoux, Geoffroy Riot. Modelling of crud growth phenomena on PWR fuel rods under nucleate boiling conditions. NPC2012 - NUclear Plant Chemistry Conference - International Conference on Water Chemistry of Nuclear Reactors Systems, Sep 2012, Paris, France. ⟨cea-04475789⟩
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