Seminar: Passive gamma emission tomography for verifying spent nuclear fuel – recent activities in Finland

  • Date: –11:00
  • Location: Ångströmlaboratoriet, Lägerhyddsvägen 1 Sal 90103 and Zoom: https://uu-se.zoom.us/j/64074355824
  • Lecturer: Pr. Peter Dendooven, University of Helsinki, Finland
  • Contact person: Peter Andersson
  • Seminarium

Finland is planning to start the disposal of spent nuclear fuel in a geological repository around 2025. A reliable verification method for the fuel is needed to ensure that all fuel going into the repository corresponds to declarations. As part of this verification method, Passive Gamma Emission Tomography (PGET) of the spent fuel, an IAEA-approved non-destructive assay method, is being developed in a collaboration between STUK, IAEA, the Helsinki Institute of Physics and the Department of Mathematics and Statistics at the University of Helsinki. After introducing the basics of emission tomography, the design of the PGET device will be described. The image reconstruction method in which emission and attenuation are reconstructed simultaneously will be discussed in some detail. The performance of the PGET device will be illustrated using measurements performed at the Finnish nuclear power plants. In these measurement campaigns, fuel assemblies of 10 different types and covering a wide range of burnup, cooling time and initial enrichment, were imaged. How further developments aim to expand the capabilities of the method will be discussed.