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Nuclear Transmutation03:20

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Area of Science:

  • Nuclear Chemistry
  • Radiochemistry
  • Chemical Kinetics

Background:

  • Radiation-induced reactions of actinides are critical for nuclear fuel reprocessing.
  • Elevated temperatures and nitric acid concentrations influence actinide redox behavior.

Purpose of the Study:

  • To determine rate coefficients for pentavalent neptunium reacting with nitrate radicals at elevated temperatures.
  • To refine multiscale models for radiation-induced neptunium redox chemistry in nitric acid.

Main Methods:

  • Derivation of rate coefficients and calculation of Eyring and Arrhenius parameters.
  • Revisiting and iterating a multiscale model for neptunium redox chemistry.

Main Results:

  • Established rate coefficients for the neptunium-nitrate radical reaction at high temperatures.
  • Developed an updated multiscale model effective across a broad range of nitric acid concentrations (0.1-6.0 M).

Conclusions:

  • The study provides essential kinetic data for actinide reactions under reprocessing conditions.
  • Improved modeling enhances understanding of neptunium's behavior in irradiated nuclear fuel environments.