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Area of Science:

  • Nuclear Engineering
  • Analytical Chemistry
  • Chemical Engineering

Background:

  • Nuclear energy is a key low-carbon power source, with fuel recycling offering material and waste management benefits.
  • In situ monitoring tools are crucial for real-time control and understanding of nuclear material recycle processes.
  • Simultaneous multi-location measurements enable real-time mass balance and material accountancy.

Purpose of the Study:

  • To demonstrate a mass balance study of neodymium (Nd3+) during countercurrent aqueous/organic metal extraction.
  • To validate the use of in situ visible absorbance spectroscopy for real-time monitoring in nuclear fuel recycling.
  • To assess the application of chemical data science algorithms for concentration calculations.

Main Methods:

  • Utilized a visible absorbance detector for simultaneous monitoring of Nd3+ concentration at multiple locations (inlets/outlets of aqueous and organic phases).
  • Employed chemical data science algorithms for calculating Nd3+ concentration, with model training on a single detector track.
  • Conducted a mass balance study within a single centrifugal contactor during metal extraction.

Main Results:

  • Simultaneously monitored Nd3+ concentration across up to six locations in real-time.
  • Successfully calculated Nd3+ concentrations using data science models, addressing challenges of single-track model application.
  • Observed a near-zero difference in integrated moles of Nd3+ between inlet and outlet, confirming mass balance.

Conclusions:

  • Online spectroscopic monitoring effectively tracked changing solution conditions during nuclear fuel recycling.
  • The system accurately measured Nd3+ concentrations in various locations within the contactor.
  • The study confirmed the feasibility of real-time mass balance calculations using in situ monitoring in nuclear material recycle processes.