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Four representative fuel rods of the KOLA-3 data set from the IFPE Database have been analyzed employing the latest TRANSURANUS-WWER version VIM2J99. The enhanced fission gas release above 40MWd/tU cannot be modelled with the standard fission gas release models. An attempt has been made to include the formation of the High Burn-up Structure in the fission gas release model. Although reasonable results are obtained, further research is needed to better understand the mechanisms of the enhanced fission gas release at high burn-up. The MATRPO-N1 correlation's for cladding creep and swelling lead to a systematic underprediction of radial and axial deformation. These results could indicate that pellet cladding interaction starts already at about 25 MWd/kgU. The empirical correlation gives better results and is recommended unless the discrepancy obtained with the MATPRO-N1 correlation can be resolved.

Additional information

Bibliographic Reference: Paper presented: 3rd International Seminar on WWER Fuel Performance, Pamparovo (BU), 4-8th November (1999)
Availability: Available from Public Relations and Publications Unit, Ispra (IT)
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