Service-life analysis of nuclear reactor elements under high-frequency random loading

Service life extension for working equipment and nominal service life extension (to 60 or more years) for nuclear reactors under construction make it even more urgent to evaluate the effect of the high-frequency component of loading (vibrations) on the long-time serviceability of structural elements. The main methodological problem of the present evaluations is to reduce the random process of vibrational loading to a harmonic form using the criterion of equivalence of fatigue damage to structural material. On the basis of experimental studies of 08Kh18N10T austenitic steel samples, an algorithm is proposed for systematizing the random process of vibrational loading to a harmonic form taking account of the slope of the fatigue curve in the high-cycle loading range.