Ядерна фізика та енергетика Nuclear Physics and Atomic Energy   ISSN: 1818-331X (Print), 2074-0565 (Online)   Publisher: Institute for Nuclear Research of the National Academy of Sciences of Ukraine   Languages: Ukrainian, English, Russian   Periodicity: 4 times per year   Open access peer reviewed journal

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S. N. Pelykh¹, Huiyu Zhou², O. B. Maksymova<sup>3

1</sup> Odessa National Polytechnic University, Odessa, Ukraine
² Northwestern Polytechnical University, Xi'an, China
³ Odessa National Academy of Food Technologies, Odessa, Ukraine

^*Corresponding author. E-mail address: 1@pelykh.net

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 coefficient ∂k/∂φ on NTAI boundaries is studied and the effect of a negative ∂k/∂φ favouring the oscillatory instability of neutron flux and pressure is shown.

Keywords: steam reactivity effect, neutron-thermoacoustic instability, VVER-1000.

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