NuFuel & MMSNF 2015

First Workshop on Research into Nuclear Fuel in Europe
and Materials Modeling and Simulation for Nuclear Fuels Workshop
Karlsruhe, Germany, November 16th to 18th, 2015

Updated: Tue 08 Dec 2015, 14:27

Poster 2.1: High frequency acoustic microscopy as post irradiation examination technique

Mara Marchetti1,2,3, D. Laux2,3, F. Cappia1,4, T. Wiss1
  • 1: European Commission, Joint Research Centre, Institute for Transuranium Elements (ITU), Hermann-von-Helmholtz Platz 1, PO Box 2340, DE–76125 Karlsruhe, Germany
  • 2: University of Montpellier, IES, UMR 5214, F–34000, Montpellier, France 3: CNRS, IES, UMR 5214, F–34000, Montpellier, France
  • 4: Technische Universität München, Department of Nuclear Engineering, Boltzmannstraße 15, 85747 Garching bei München, Germany

Abstract

The non-uniform variation of porosity along the radius of the irradiated uranium dioxide pellets can contribute, in addition to other effects, to affect the safety of the nuclear fuel during the in-pile operations. Acoustic Microscopy is a non destructive technique that allows the determination of the mechanical properties of the irradiated nuclear fuel by measuring the Rayleigh surface wave velocity; in particular it enables the determination of the Young’s modulus and the porosity on local scale. Due to the fact that matter is not opaque to acoustic waves, using high frequency acoustic microscopy is also possible to obtain information regarding the cracks below the surface of the sample. A study performed on a 67 GWd/tU uranium dioxide pellet has demonstrated the good comparability between the porosity calculated in different points of the radius by ceramographic image analysis and acoustic microscopy. The consistency of the results obtained has confirmed the validity of the acoustic microscopy as post irradiation examination technique.