The physics and regularities of the neutron-thermoacoustic instability

Abstract

The physics and regularities of the neutron-thermoacoustic instability (NTAI) in nuclear channels with subcooled nucleate boiling flows are explained. The method for obtaining the characteristic equation of NTAI in a VVER-type reactor is given. The influence of steam reactivity coefficienton NTAI boundaries is studied and the effect of a negative / k   favouring the oscillatory instability of neutron flux and pressure is shown.