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April 15, 2026Journal of Nuclear MaterialsOpen Access

Analysis of the behavior of ATF micro-cell UO2-Mo and UO2-Cr fuels under irradiation: thermomecanical effects of an enhanced conductivity

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Authors

VAVeronica D’ AmbrosiJFJules FauqueLPLuc Portelette

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Overview

Numerical simulations analyze thermomechanical behavior in UO2-Mo and UO2-Cr fuels, indicating improved performance.

Key Points

  • This work aims to analyze the behavior of UO2 fuels with micro-cells under irradiation, focusing on thermal conductivity and thermomechanical effects.
  • Modeling various 3D micro-structures of micro-cell CERMET fuels.
  • Investigation of micro-cells shape and defects on effective conductivity.
  • Analysis of thermomechanical behavior using the ALCYONE fuel performance code.
  • Thermodynamic calculations for oxygen potential and phase composition under irradiation.
  • CERMET fuels exhibit reduced tendency to crack and expand under irradiation.
  • Enhanced thermal conductivity leads to lower operational temperatures compared to standard UO2.
  • Delayed gap closure kinetics in nominal conditions.
  • In transient conditions, increased melting margins enhance fuel performance.

Cite This Study

Ambrosi et al. (2026) studied this question.

synapsesocial.com/papers/69df2cb9e4eeef8a2a6b1ecehttps://doi.org/10.1016/j.jnucmat.2026.156659
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