The high-temperature and radiative effect on concrete

Phenomenological models of the high-energy radiation effect on a condensed medium such as rocks and structural materials are summarized. The degradation of the medium exposed to ionizing radiation and high-temperature heating is considered. The time of creation of the lava-like fuel-containing material after the Chernobyl NPP Unit 4 explosion is estimated based on the kinetics of the three-phase model of concrete. A calculation technique of the neutron irradiation characteristics of concrete using the Geant4 software package is described. The phenomenological model of the behavior of concrete under radiation and hightemperature conditions is proposed.