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

Full text (ru)

Abstract: The main peculiarities of ignition and development of self-sustaining nuclear chain reaction (SCR) in fuel-containing masses (FCM) of Chernobyl "Ukryttya" were studied for the case of varying velocity of water incoming into the system or its outcoming. On the basis of analysis and numerical solution of the corresponding system of differential equations for the main characteristics of the system, it was shown that the variations of water inflow could lead to very sufficient and various changes in SCR development comparing to possible modes at constant velocities of water inflow. In particular, the calculations show that the neutron bursts with great amplitude could take place in the system under definite sufficiently reasonable physical conditions. It was also shown that the increase of velocity of water inflow into the FCM in the mode of constant oscillations can lead to transition into "beyond critical" state which is the subcritical state with big quantity of water.

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

1. 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

2. V.A. Babenko, V.N. Pavlovych. Study of Ignition Possibility, Development and Properties of Self-Sustaining Nuclear Chain Reaction in the Fuel-Containing Masses of the Object “Ukryttya”. Yaderna Fizyka ta Energetyka (Nucl. Phys. At. Energy) 18(3) (2017) 254. (Rus) https://jnpae.kinr.kyiv.ua/18.3/Articles_PDF/jnpae-2017-18-0254-Babenko.pdf

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, 1997) 30 p. (Rus)

4. V.A. Babenko, L.L. Jenkovszky, V.N. Pavlovych. Nuclear Power Industry: Tendencies in the World and Ukraine. Physics of Particles and Nuclei 38(6) (2007) 795. https://doi.org/10.1134/S1063779607060056

5. V.A. Babenko et al. Modelling of Mass and Geometrical Parameters of a Aggregation of Fuel-Containing Materials in the Southeast Part of a Premise 305/2 Destroyed 4-th unit Chernobyl NPP. Problemy Bezpeky Atomnykh Elektrostantsyij i Chornobilya 9 (2008) 36. (Rus) http://mntc.smn.com.ua/downloads/2008_09/c36.pdf

6. E.D. Vysotskij, A.A. Klyuchnikov, V.N. Shcherbin, V.B. Shostak. Neutron-Physical Characteristics of Nuclear Dangerous Accumulations of Fuel Contained Materials. Problemy Bezpeky Atomnykh Elektrostantsyij i Chornobilya 12 (2009) 93. (Rus) http://mntc.smn.com.ua/downloads/2009_12/c93.pdf

7. 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

8. V.B. Shostak, V.N. Shcherbin, E.E. Olejnik. Determination of Size of Parameters of Model of Describing Nuclear-Dangerous Accumulation of Fuel Contained Materials in Object ‘Ukryttya’. Problemy Bezpeky Atomnykh Elektrostantsyij i Chornobilya 22 (2014) 98. (Rus) http://mntc.smn.com.ua/downloads/2014_22/c98.pdf

9. V.V. Frolov. Anomalous Incident on June 27 - 30, 1990 in the Object ‘Cover’ at the Chernobyl Nuclear Power Plant. Atomic Energy 80(3) (1996) 215. https://doi.org/10.1007/BF02414811

10. O.Ya. Vertsimakha, V.N. Pavlovych. Ignition and Development of Self-Sustained Chain Reaction in Fuel Containing Masses of 4-th Block of the Chornobyl NPP. Nuclear and Radiation Safety 1(1) (1999). (Rus)