Forecasting of calculational levels of vibrations in designed elements of a NPP thermal circuit

Methods for evaluating the vibrations of NPP thermal circuit elements which have undergone structural changes, when designing the equipment, are proposed. The methods serviceability is demonstrated taking the calculation of the modified option of the Leningrad NPP group collector as an example. According to the evaluations obtained the level of the modified collector vibrations is increased but no more than 2 times as compared to the sorce option. The experimental investigations confirm this predictions