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Passive Sampling Tool for Actinides in Spent Nuclear Fuel Pools.

Joshua D Chaplin1, Marcus Christl2, Marietta Straub1

  • 1Institute of Radiation Physics, Lausanne University Hospital and University of Lausanne, 1 Rue du Grand-Pré, Lausanne CH-1007, Switzerland.

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A new passive sampling technique using diffusive gradients in thin-film (DGT) configurations allows for in-situ measurement of actinides in spent nuclear fuel pools. This method simplifies monitoring and supports advanced techniques like Cm isotope dating for nuclear fuel.

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Area of Science:

  • Nuclear Chemistry
  • Environmental Monitoring
  • Radiochemistry

Background:

  • Spent nuclear fuel requires careful management to prevent environmental radionuclide contamination.
  • Radionuclide monitoring in spent fuel pool water is crucial for environmental protection and decommissioning planning.
  • Existing methods for radionuclide analysis involve complex sample retrieval and processing.

Purpose of the Study:

  • To introduce the first passive sampling technique for actinide measurement in spent nuclear fuel pools.
  • To adapt and apply diffusive gradients in thin-film (DGT) technology for in-situ radionuclide immobilization.
  • To enable high-precision isotopic analysis and facilitate advanced applications like nuclear fuel dating.

Main Methods:

  • Development and application of a novel diffusive gradients in thin-film (DGT) passive sampler.
  • In-situ immobilization of actinides (U, Pu, Am, Cm) from spent fuel pool water.
  • Calibration of effective diffusion coefficients for actinides in borated pool water.
  • Analysis of collected samples using accelerator mass spectrometry (AMS).

Main Results:

  • Successful deployment of DGT samplers in a nuclear facility's fuel pool.
  • Demonstration of the first DGT application for curium (Cm) measurement.
  • Provision of calibrated effective diffusion coefficients for key actinides.
  • High-precision isotopic data obtained, enabling independent validation of Cm-based fuel dating.

Conclusions:

  • The developed DGT passive sampling technique offers a simplified and effective approach for monitoring actinides in spent nuclear fuel pools.
  • This method reduces the need for extensive sample handling and processing.
  • The technique supports advanced nuclear fuel analysis, including dating via Cm isotope signatures.