IBR-2 reactor physical start-up. Correlation analysis of pulse power fluctuations and moving reflector vibrations

The part of IBR-2 reactor physical start-up program concerning the statistical treatment of random processes measured at a pulse regime of operation of the reactor at mean power no more than 300 W is discussed. Peak power excursions, axial and angular oscillations of moving reflectors, reactivity fluctuations due to the water flow in moderators, and the correlations of processes are investigated at various mean power levels and rotating rates of the reflectors. Spectrum, correlation and other characteristics of processes analyzed have been calculated. The most correlation found is between the pulse power and axial vibrations of the main moving reflector. A standard deviation for the energy of the pulse is no more than 10% at a mean power more than 100 W. The pulse stability and behaviour of the moving reflectors are satisfactory