[en] Selective coefficients of sputtering of austenitic steels Kh18N10T and heat resistant alloy KhN75MBTYu have been measured. It is shown that a spectral probe method can be used to determine selective sputtering coefficients of the components containing in small quantity (2-3 at %). A novel method of determination of concentrations of the main components of construction materials is proposed and employed. The theory is developed and model calculations of change of the composition and erosion of the surface of austenitic steels are conducted in conditions of carbon sputtering from other construction materials of the reactor