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HIGH BURNUP CHANGES IN UO₂ FUELS IRRADIATED UP TO 83 GWD/T IN M5® CLADDINGS
J. NOIROT,I. AUBRUN,L. DESGRANGES,K. HANIFI,J. LAMONTAGNE,B. PASQUET,C. VALOT,P. BLANPAIN,H. COGNON 한국원자력학회 2009 Nuclear Engineering and Technology Vol.41 No.2
Since the 90’s, EDF and AREVA-NP have irradiated, up to very high burnups, lead assemblies housing M5® cladded fuels. Post-irradiation examination of high burnup UO₂ pellets show an increase in the fission-gas release rate, an increase in fuel swelling, and formation of fission-gas bubbles throughout the pellets. Xenon abundances were quantified, and phenomena leading to this bubble formation were identified. All examinations provided valuable data on the complex state of the fuel during irradiation. They show the good behavior of these fuels, exhibiting various microstructures at very high burnups, none of which is likely to lead to problems during irradiation
HIGH BURNUP CHANGES IN UO<sub>2</sub> FUELS IRRADIATED UP TO 83 GWD/T IN M5<sup>(R)</sup> CLADDINGS
Noirot, J.,Aubrun, I.,Desgranges, L.,Hanifi, K.,Lamontagne, J.,Pasquet, B.,Valot, C.,Blanpain, P.,Cognon, H. Korean Nuclear Society 2009 Nuclear Engineering and Technology Vol.41 No.2
Since the 90's, EDF and AREVA-NP have irradiated, up to very high burnups, lead assemblies housing $M5^{(R)}$ cladded fuels. Post-irradiation examination of high burnup $UO_2$ pellets show an increase in the fission-gas release rate, an increase in fuel swelling, and formation of fission-gas bubbles throughout the pellets. Xenon abundances were quantified, and phenomena leading to this bubble formation were identified. All examinations provided valuable data on the complex state of the fuel during irradiation. They show the good behavior of these fuels, exhibiting various microstructures at very high burnups, none of which is likely to lead to problems during irradiation.