INVESTIGATION OF THE CORROSION RESISTANCE OF FUEL MICROPELLET CLADDING MADE OF SILICON CARBIDE AND PYROLYTIC CARBON FOR THE OPERATING CONDITIONS OF LIGHT-WATER REACTORS IN NUCLEAR POWER PLANTS

摘要

The results of experimental and theoretical investigations of the corrosion of outer protective coatings, made of silicon carbide and pyrolytic carbon, of fuel microspherules in high-pressure water and water vapor in the range 350-950℃ are presented. The tests lasted for times ranging from 300 to 11800 h were conducted for the operating conditions of light-water reactors. A comparative estimate is given of the corrosion resistance of two types of coatings. The temperature-time curves, which make it possible to determine by interpolation and extrapolation the degree of corrosion of the protective coatings for different operating regimes of the reactor, are obtained.