MOX thermal conductivity XTADS driver fuel

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MOX thermal conductivity (XT-ADS driver fuel)

• V. Sobolev, B. Arien
• SCKCEN, Boeretang 200, Mol, Belgium

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Introduction

• Isotopic composition of the XT-ADS fuel has been
  described in Deliverable D1.1 of DM1.
• Recommendations on main thermal and mechanical
  properties of the driver MOX and MA oxide fuels
  have been presented in Deliverable D3.4 of DM3.
• However, uncertainty still exists on irradiation
  degradation of thermal conductivity and other
  thermophysical and mechanical parameters of fuel.
• Up to now the EFR recommendations (of 1993) are
  used for irradiation induced degradation of MOX
  thermal conductivity, in spite of the fact that
  they are not in good agreement with later
  published recommendations.

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2. MOX thermal conductivity open literature
recommendations
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2. MOX thermal conductivity literature
recommendations
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3. MOX thermal conductivity fresh,
stoichiometric fuel
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4. Effect of stoichiomety deviation
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4. Stoichiometry deviation supplementary thermal
resistivity
Barons correlation overestimates others are in
a good agreement
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5. Burnup effect on thermal conductivity
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5. Burnup effect supplementary thermal
resistivity
EFR Philipponneau correlations strongly
underestimate Modified Duriez-NFI gives best
estimate for others.
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Conclusions

• MOX thermal conductivity dependence on Pu
  content is neglected in most of models. Barons
  correlation takes it into account.
• Barons correlation overestimates the effects of
  non-stoichiometry and burnup.
• EFR model strongly underestimates the effect of
  burnup.
• HALDEN, Carbajo (Lucata burnup model) and
  modified Duriez-NFI correlations can be used for
  prediction of burnup effect in XT-ADS MOX.