Fuel components and fission products diffusion on the surface of communicating cavities of a thermionic electricity-generating channel

The diffusion of fuel components and fission products on the surface of communicating cavities of a thermionic electricity-generating channel of a nuclear power facility is studied analytically. The Arrhenius constants are determined for the electricity-generating channel. A model is developed for the diffusion of the atoms of the fuel components and fission products on the surface of fuel element cladding. The results are used to determine the negative effect of the diffusion of uranium, as the main component of the fuel, and the uranium fission products molybdenum, niobium, and zirconium on the emission-adsorption characteristics of the electrodes of the electricity-generating channel and the electrical properties of the nuclear power facility. Proposals are made for reducing the effect of the phenomenon analyzed.