Modeling missing pellet surface defects with BISON

Henri Loukusa

Research output: Book/ReportReport


In this report, the BISON fuel performance code developed at Idaho National Laboratory was used to model a missing pellet surface. Such an analysis requires modifications to automatically generated meshes to model a missing pellet surface type defect. A method to modify these automatically generated meshes was devised in this work, and it can be used in the future to generate more intricate pellet geometries.

A two-dimensional model for the missing pellet surface was used in this work, even though it does not capture all phenomena occurring at the location of the missing pellet surface defect. Stresses in the cladding and pellet were investigated at the defect location, and as expected the von Mises stress at the cladding inner surface was higher in the missing pellet surface case. At the location of highest stress in the missing pellet surface case, the von Mises stress was over 100 MPa higher than in the fuel rod without a defect.
Original languageEnglish
PublisherVTT Technical Research Centre of Finland
Number of pages27
Publication statusPublished - 2019
MoE publication typeD4 Published development or research report or study

Publication series

SeriesVTT Research Report

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