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Related Experiment Videos

Waste form corrosion modeling: comparison with experimental results.

B Kienzler1, B Luckscheiter, S Wilhelm

  • 1Forschungszentrum Karlsruhe, Institut für Nukleare Entsorgung, INE, Germany. kienzler@ine.fzk.de

Waste Management (New York, N.Y.)
|November 9, 2001
PubMed
Summary

Leaching experiments with high-level radioactive waste (HLW) glass show that reaction path modeling accurately predicts silica and strontium concentrations. Sorption on glass corrosion products may explain discrepancies in americium concentrations.

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Area of Science:

  • Nuclear waste management
  • Materials science
  • Geochemistry

Background:

  • Simulated high-level radioactive waste (HLW) glass leaching is critical for nuclear waste disposal safety assessments.
  • Understanding the long-term behavior of HLW glass in repository environments is essential.

Purpose of the Study:

  • To compare measured concentrations of glass components, fission products, and actinides with computed data from leaching experiments.
  • To evaluate the accuracy of reaction path modeling in predicting HLW glass dissolution.

Main Methods:

  • Leaching experiments with active and inactive simulated HLW glass in concentrated NaCl solution.
  • Measurement of solution concentrations of glass components, fission products, and actinides.
  • Comparison of experimental data with computed values using reaction path modeling.

Related Experiment Videos

  • Investigation of sorption processes on glass corrosion products.

    • Main Results:

    • Computed pH values align with experimental findings for inactive glass.
    • Reaction path modeling adequately describes silica and strontium concentrations.
    • Uranium concentrations are explained by schoepite or Na2U2O7 precipitation.
    • Computed americium concentrations exceed measured data, suggesting sorption on corrosion products.

    Conclusions:

    • Reaction path modeling is a valuable tool for predicting HLW glass behavior, particularly for silica and strontium.
    • Sorption on glass corrosion products significantly influences the mobility of actinides like americium and lanthanides.
    • Further research is needed to refine models for actinide behavior in HLW disposal scenarios.