Study of nuclear fuel interaction with core construction materials in the case of the above design accident

The paper summarizes the results of studies on the synthesis the lavalike fuel-containing mass (LFCM) in laboratory conditions with goal to clarify the temperature and time parameters of accident running with core meltdown on the Chernobyl Unit 4. The temperature interval of fuel material (UO2 + ZrO2) melting with composition very nearly for fuel material in the reactor core and LFCM formation temperature with artificial LFCM chemical composition and corresponding to real LFCM, which are located in rooms under reactor of Unit 4, is defined. Thermal conductivity and density of the LFCM samples was measured.