[en] An in-reactor performance computer code for the blanket fuel is being developed in the conceptual design stage of blanket fuel for HYPER. The present development status of the DIMAC code is in the second step which emphasizes on fuel swelling calculation particularly. In this paper, mechanistic swelling models were developed and the models were installed into the DIMAC program. The preliminary calculation results for (TRU-Zr)-Zr dispersion fuel predicted by DIMAC were compared with those of silicide dispersion fuel predicted by DIFAIR. It appeared that the swelling levels for (TRU-Zr)-Zr dispersion fuel were relatively higher than those of silicide fuel, and the dispersion fuel performance may be limited by swelling. Therefore, some experimental tests including inpile and outpile experiments are need for clarifing the integrity and the material properties of the inter-metallic fuel core