Nuclear Physics and Atomic Energy


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 2017, volume 18, issue 3, pages 254-266.
Section: Atomic Energy.
Received: 12.06.2017; Accepted: 12.10.2017; Published online: 28.12.2017.
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Study of ignition possibility, development and properties of self-sustaining nuclear chain reaction in the fuel-containing masses of the object Ukryttya

V. A. Babenko1,2, V. N. Pavlovych2,3,*

1 Bogolyubov Institute for Theoretical Physics, National Academy of Sciences of Ukraine, Kyiv, Ukraine
2 Institute for Safety Problems of Nuclear Power Plants, National Academy of Sciences of Ukraine, Kyiv, Ukraine
3 Institute for Nuclear Research, National Academy of Sciences of Ukraine, Kyiv, Ukraine


*Corresponding author. E-mail address: pavlovich@kinr.kiev.ua

Abstract: Main characteristic properties of ignition and development of self-sustaining nuclear chain reaction (SCR) in the fuel-containing masses (FCM) of the object Ukryttya, and also the main properties of SCR for a number of its typical essentially possible modes were studied. System of differential equations for the main physical quantities describing FCM was formulated. Numerical analysis and calculations according to this system show that the main possible modes of SCR are exponential growth of the neutron flux, mode of the solitary neutron flux burst of differing strength, and also mode of the neutron flux oscillations. Mode of the flux oscillations is of great interest and exhibits various properties. According to calculations, the neutron flux burst of extremely high strength appears to be possible under some likely and reasonable physical conditions in presence of the sufficient accumulation of fissile materials. But the most realistic and close to the experiment mode of SCR appears to be the mode of slow growth of the neutron flux progressively, as the system is flooded by water, and further subsequent transition into the mode of the neutron flux oscillations in the neighbourhood of the critical state.

Keywords: nuclear chain reaction, fuel-containing masses, neutron flux.

References:

1. E.D. Vysotskii et al. Nuclear-hazardous accumulations of fuel-containing materials in the destroyed fourth Unit of the Chernobyl NPP. Radiochemistry 53(2) (2011) 206. https://doi.org/10.1134/S1066362211020160

2. V.A. Babenko et al. Fuel-Containing Masses of Chernobyl Unit 4: Multiplying Properties and Neutron Characteristics. Nucl. Sci. Eng. 133(3) (1999) 301. https://doi.org/10.13182/NSE99-A2090

3. V.A. Babenko et al. Investigation of multiplicating properties of fuel containing masses of the 4th block at Chornobyl Atomic Power Plant. Preprint KINR-97-1 (Kyiv, Institute for Nuclear Research of NASU, 1997) 30 p.

4. V.A. Babenko, L.L. Jenkovszky, V.N. Pavlovych. Nuclear power industry: Tendencies in the world and Ukraine. Phys. Part. Nucl. 38(6) (2007) 795. https://doi.org/10.1134/S1063779607060056

5. V.A. Babenko et al. Modeling of mass and geometric parameters of fuel-containing materials accumulation in the South-Eastern part of room No. 305/2 of the destroyed 4-th unit of the ChNPP. Problemy Bezpeky Atomnykh Elektrostantsii i Chornobylya 9 (2008) 36. (Rus) http://www.ispnpp.kiev.ua/wp-content/uploads/2017/2008_09/c36.pdf

6. E.D. Vysotskij et al. Neutron-physical characteristics of nuclear-hazardous clusters of fuel-containing materials. Problemy Bezpeky Atomnykh Elektrostantsii i Chornobylya 12 (2009) 93. (Rus) http://www.ispnpp.kiev.ua/wp-content/uploads/2017/2009_12/c93.pdf

7. V.B. Shostak, V.N. Shcherbin, E.E. Olejnik. Determination of the parameters values of the model describing the nuclear-dangerous accumulation of fuel-containing materials accumulation in the object Ukryttya. Problemy Bezpeky Atomnykh Elektrostantsii i Chornobylya 22 (2014) 98. (Rus) http://www.ispnpp.kiev.ua/wp-content/uploads/2017/2014_22/c98.pdf