RT Dissertation/Thesis
T1 Synthesis and characterization of nanocrystalline UO2 ceramics
A1 Jovani Abril, Raquel
A2 Universidade de Santiago de Compostela. Facultade de Química. Departamento de Química Física. Institute for Transuranium
Elements Joint Research Centre, 
K1 Nanocrystals
K1 Ceramics
K1 Aqueous and organic synthesis
K1 Nanostructure
K1 High burn-up structure
AB High-performance ceramics with nanosized grains provide today the technical basefor a large variety of improved applications in many technologies. This type ofmicrostructure is of special interest as well in the nuclear field as it appears at theperiphery of light water reactor (LWR) UO2 fuels at high burn-up (BU), where thematerial transforms spontaneously to a closed porous nanocrystalline nc-structure aftersurpassing a critical dose. The mechanical properties of this newly formed material aresuperior to those of the fresh fuel due to the nanostructure. Taking this into account,the aim of this work is to develop a fuel consisting of nc-UO2, which, besides theadvantages of enhanced plasticity and faster creep, characteristic of the nc-state, whichdiminish the pellet clad interaction (PCI) stresses and cladding failure risks, has alsothe potentiality to develop closed porosity under irradiation, to largely retain fissiongases. The study of its behaviour is therefore important, especially during accidentconditions under which large amounts of radioactive fission products could be releasedinto the reactor vessel, or to the exterior if the core containment breaks. Its potentialityfor retention of fission gas and its improved mechanical properties and resistanceto radiation-damage make so the nc-fuel material worthy of deep experimental analysis.
YR 2014
FD 2014-11-26
LK http://hdl.handle.net/10347/11897
UL http://hdl.handle.net/10347/11897
LA eng
DS Minerva
RD 28 abr 2026