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Three rods were irradiated in IFA-429 to approximately 26-29 MWd/kgUO2 were instrumented with bellows type pressure transducers for monitoring in-pile fission gas release by measuring the rod internal pressure. They were irradiated in the Halden rig IFA-519.9.
Rod DC was irradiated in the upper cluster and rods DH and DK were irradiated in the lower cluster of this assembly in IFA-429. The average linear heat rate during the irradiation was below 20kW/m. At this low power, fission gas was accumulated within the matrix without perceptible release. This was confirmed during re-instrumentation since no change in pressure was measurable from the initial fill pressure. The burn-up archived at the end of IFA-429 was approximately 28.7 MWd/kgUO2 for rod DC, 25.9 MWd/kgUO2 for rod DH, and 28.9 MWd/kgUO2 for rod DK.
The rods in IFA-519.9 were re-instrumented with bellows type pressure transducers so that fission gas release could be monitored from measurements of the rod internal pressure during irradiation. However, In-pile data were only available for rods DH and DK because the fission gas release could not be monitored for rod DC since there has been no open connection between the instrumented part with the pressure transducer and the fuel stack. Rods had different combinations of the grain size and the pellet-cladding gap to compare the difference in behaviour of the three rods. They were irradiated at a power level of around 40kW/m and the burn-up archived at the end of IFA-519.9 was performed approximately 90MWd/kgUO2.
After irradiation in IFA-519.9, PIE was performed on rods DC, DH and DK at Kjeller to obtain information on the effect of the design parameters on fission product distribution, fission gas release and dimensional changes causing PCMI. Rod DC was punctured both in the instrumentation and in the fuel rod plenum.
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K. Lassmann, J. van de Laar: A new Data-Condensation Method based on Multidimensional Minimisation, Technical Report JRC-ITU-TN-2001/32, 2001
K. Lassmann, J. van de Laar: "A new Data-Condensation Method Based on Multidimensional Minimisation", KERNTECHNIK 69 (2004) 21-25
Keywords: burnup, diffusion, experimental data, fission gas release, fuels, modelling, post-irradiation examination.