Nuclear Physics and Atomic Energy

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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Nucl. Phys. At. Energy 2018, volume 19, issue 3, pages 244-251.
Section: Atomic Energy.
Received: 17.09.2018; Accepted: 11.10.2018; Published online: 04.12.2018.
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The physics and regularities of the neutron-thermoacoustic instability

S. N. Pelykh1, Huiyu Zhou2, O. B. Maksymova3

1 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:

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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