The purpose of this research is to compute the power distribution of contemporary Russian PWR designs (VVER), as well as to evaluate alternative fuel material compositions based on heat conductivity and power distributions. In the work, a review of currently relevant materials for emergency-resistant fuel systems was carried out, emergencyresistant materials for the VBER-300 project were selected. A thermal calculation was performed, the main geometric parameters of the core were determined, the coolant velocity was determined, and the temperature distribution over the cross-section of the fuel element for different types of fuel systems was obtained by ANSYS. The results of the temperature distribution and the working conditions of UO2 and UO2+5%Cr (CERMET) fuels and whether they can operate safely or not have been obtained.