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A reduced order model for fission gas diffusion in columnar grains
Pizzocri D.,Di Gennaro M.,Barani T.,Silva F.A.B.,Zullo G.,Lorenzi S.,Cammi A. 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.11
In fast reactors, restructuring of the fuel micro-structure driven by high temperature and high temperature gradient can cause the formation of columnar grains. The non-spheroidal shape and the non-uniform temperature field in such columnar grains implies that standard models for fission gas diffusion can not be applied. To tackle this issue, we present a reduced order model for the fission gas diffusion process which is applicable in different geometries and with non-uniform temperature fields, maintaining a computational requirement in line with its application in fuel performance codes. This innovative application of reduced order models as meso-scale tools within fuel performance codes represents a first-of-a-kind achievement that can be extended beyond fission gas behaviour.