TRISO　particle　is　adopted　in　the　design　of　various　types　of　reactors　and　accident　tolerant　fuel　(ATF)　due　to　its　excellent　accident　tolerant　performance　under　high　temperature　and　other　severe　conditions.　This　study　presents　a　multidimensional　thermomechanical　analysis　of　TRISO　particle　fuel　with　SiC/ZrC　coating　under　typical　operation　conditions　in　reactor.　Key　fuel　performance　phenomena　were　considered　including　thermal　performance　(heat　generation,　conduction,　irradiation　gap　heat　transfer,　etc.),　mechanics　(thermal　expansion,　elastic　strain,　densification,　fission　product　swelling　strain,　contact,　and　thermal,　irradiation　creep,　etc.),　also　irradiation　behaviors　(burnup,　fission　gas　production　and　release,　gap/plenum　pressure　with　plenum　volume,　etc.).　All　these　models　have　been　integrated　and　solved　via　finite-element　method.　As　for　results,　several　complicated　models　were　implemented　and　proved　to　successfully　predict　the　thermomechanical　behaviors　of　TRISO　coated　fuel　compared　with　the　existing　experimental　or　numerical　results.　An　enhanced　fission　gas　behavior　model　considering　grain　boundary　diffusion　was　established,　which　could　complete　detailed　calculation　on　fission　gas　release　at　both　grain　size　and　fuel　particle　pellet　scales.　Based　on　the　preliminary　thermomechanical　analysis,　in　terms　of　structural　strength　and　heat　transfer　efficiency,　ZrC　appears　to　be　a　candidate　material　of　SiC.　Moreover,　failure　mechanisms　and　effective　thermal　conductivity　have　been　analyzed　using　the　current　modified　analysis　technique.　©　2020　Elsevier　Ltd