During its lifetime in the core of a nuclear reactor, the fuel undergoes significant changes in its physical, chemical and morphological characteristics. In outer regions of the fuel pellets the so called “high burn-up” or “rim” structure may form. In this region UO2 grains, with an original size of about 10 μm in fresh dense fuel, are reorganized into a porous structure with grain size 0.1–0.3 μm and porosity fraction up to 20 %. The mechanical, thermal and fission product retention properties of the high burn-up structure have encouraged further interest and attempts to mimic this morphology in fresh fuel. The JRC-ITU has studied various techniques for the synthesis of uranium and thorium dioxide in aqueous or nonaqueous media. Such nanoparticles can serve as starting material for production of material having similar characteristics as the high burn-up structure, as has been proved using Zr(Y)O2 nanoparticles. Recently, efforts have been focused on the compaction of the nanoparticle powders. A spark plasma sintering device (SPS, FCT Systeme GmbH) has been commissioned in the JRC-ITU and tested using various nonradioactive materials. The present study is oriented on pressing and sintering of Hf(Y)O2 and ZrO2 into nanostructured pellets. Final products have been characterized by optical and electron microscopy, X-ray powder diffraction and density measurements.
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2014 22nd International Conference on Nuclear Engineering
July 7–11, 2014
Prague, Czech Republic
Conference Sponsors:
- Nuclear Engineering Division
ISBN:
978-0-7918-4589-9
PROCEEDINGS PAPER
Synthesis of Nanostructured Fuels: Mimicking the High Burn-Up Structure Available to Purchase
Vaclav Tyrpekl,
Vaclav Tyrpekl
European Commission, JRC-ITU, Karlsruhe, Germany
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Raquel Jovani-Abril,
Raquel Jovani-Abril
European Commission, JRC-ITU, Karlsruhe, Germany
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Michael Holzhäuser
Michael Holzhäuser
European Commission, JRC-ITU, Karlsruhe, Germany
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Vaclav Tyrpekl
European Commission, JRC-ITU, Karlsruhe, Germany
Raquel Jovani-Abril
European Commission, JRC-ITU, Karlsruhe, Germany
Michael Holzhäuser
European Commission, JRC-ITU, Karlsruhe, Germany
Paper No:
ICONE22-30952, V001T02A023; 6 pages
Published Online:
November 17, 2014
Citation
Tyrpekl, V, Jovani-Abril, R, & Holzhäuser, M. "Synthesis of Nanostructured Fuels: Mimicking the High Burn-Up Structure." Proceedings of the 2014 22nd International Conference on Nuclear Engineering. Volume 1: Plant Operations, Maintenance, Engineering, Modifications, Life Cycle and Balance of Plant; Nuclear Fuel and Materials; Plant Systems, Structures and Components; Codes, Standards, Licensing and Regulatory Issues. Prague, Czech Republic. July 7–11, 2014. V001T02A023. ASME. https://doi.org/10.1115/ICONE22-30952
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