Research of temperature conditions on the surface of fuel elements under departure nucleate boiling

The paper presents the research of the phenomenon of formation and propagation of the film boiling with regard to the real fuel elements. The change in the temperature conditions and the influence of some constructive and operating parameters on the studied processes speed are considered. It is shown that with a sufficient perturbation of the shell temperature a wave of film boiling is formed. A numerical algorithm is used to implement the mathematical model of the process, developed earlier. These issues are of interest in the study of the initial stages of the development of accidents associated with overheating of fuel elements.