COMPUTATIONAL ESTIMATE OF THE CORROSION RESISTANCE OF FUEL MICROELEMENTS WITH SILICON CARBIDE CLADDING IN A WATER MEDIUM AT SUPERCRITICAL PRESSURE

摘要

A computational estimate of the corrosion resistance of a silicon carbide coating on spherical fuel microelements in a supercritical-pressure water medium at 350-700℃ is made for the nominal operating regime of the core of a light-water nuclear reactor.A model of the thermal dissociation of water and dissolution of a silicon oxide film is used to estimate the corrosion resistance of silicon carbide. An expression describing the dependence of the corrosion depth of a silicon carbide layer on the temperature and pressure of the medium (concentration of the products of dissociation of water) and the operating time of the fuel microelements is obtained on the basis of the model developed.