Developing the program and technique for vibrational tests of HTGR thermal shield structure elements

The program and methodical aspects of selection of the necessary frequency range, vibration acceleration levels, time of operations, arrangement of vibroconverters, processing and representation of the results when testing the thermal shields for the HTGR reactors using the vibration machine are considered. On the basis of analysis of the frequency spectrum of the HTGR vibration sources and test results for the PG-100 helium loop element vibrations a frequency range from 20 to 2500 Hz is selected for testing. This frequency range is recommended to be divided into 7 octaves. The maximum in acceleration vibration load is up to 100 dB (30 mxs-2). The cycle number varies within the limits of (1.9-30)x106, test duration is 4-32 h. The considered program assumes on-line recording of frequency data for analyzing the resonance modes and vibration forms