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Atomic Energy

, Volume 88, Issue 5, pp 337–344 | Cite as

Positive reactivity effect in hollow critical assemblies with moderated neutrons

  • V. F. Kolesov
  • R. Ya. Gatilova
  • L. F. Gudarenko
  • G. G. Ivanova
  • T. G. Ivchenko
  • V. G. Kudel'kin
  • S. V. Mzhachikh
  • G. G. Farafontov
  • V. Kh. Khoruzhii
Articles

Abstract

Computational results obtained using the neutron-gas-dynamic codes for fission bursts in supercritical hollow assemblies of fissioning substances with a moderated neutron spectrum, specifically, in assemblies containing a neutron absorber, with a core consisting of a mixture of uranium, enriched to 90% with235U, and polyethylene are presented. Sharp manifestations of positive reactivity in the assemblies and a difference of the effect from that in fast systems are found. It is shown that in assemblies with moderated neutrons, as compared with fast systems, 1) the scale of the increase in the energy release in a burst is substantially reduced by inserting boron into the cavity; 2) in many cases the effect has the classical form with real growth of keff and λ in time; 3) the effect is essentially independent of the properties of the moderator in the cavity; and 4) the effect is less dangerous with respect to nuclear safety. 2 figures, 3 tables, 12 references.

Keywords

Boron Uranium Energy Release Nuclear Safety Fast System 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    R. Nicholson, “Methods for determining the energy release in hypothetical fast reactor meltdown accidents”.Nucl. Sci. Eng.,18, No. 2, 207–219 (1964).Google Scholar
  2. 2.
    G. Khammel and D. Okrent,Reactivity Coefficients in Large Power Reactors Operating on Fast Neutrons [in Russian], Atomizdat, Moscow (1975), p. 237.Google Scholar
  3. 3.
    D. Hetrick, “Computer simulation of hypothetical criticality accidents in aqueous fissile solutions”.Trans. Amer. Nucl. Soc.,63, No. 1, 226–228 (1991).Google Scholar
  4. 4.
    I. Pazsit, “Comment on the modeling of thin absorbers via δ functions”Nucl. Sci. Eng.,116, No. 3, 223–225 (1994).Google Scholar
  5. 5.
    V. F. Kolesov, V. S. Bosamykin, V. Kh. Khoruzhii, and V. F. Yudintsev, “Nuclear safety of critical assemblies with a neutron absorber in a cavity”,At. Énerg.,83, No. 2, 105–112 (1997).Google Scholar
  6. 6.
    V. F. Kolesov, V. Kh. Khoruzhii, and V. F. Yudinstsev, “Reactivity effects (autocatalysis) in BR-1 and BR-K1 pulsed reactors”.At. Énerg.,85, No. 3, 179–186 (1998).Google Scholar
  7. 7.
    A. N. Grebennikov and G. G. Farafontov, “BEND archive of estimated data”,Vopr. Atom. Nauk. Tekh. Ser. Mat. Model. Fiz. Prots., No. 2, 65–71 (1994).Google Scholar
  8. 8.
    R. Ya. Gatilova, T. G. Ivchenko, N. I. Leonova, et al., “Program for numerical integration of the equations of gas dynamics and heat conduction in the package “One-dimensional systems” (program I-N-OK)”.Vopr. Atom. Nauk. Tekh. Ser. Met. Prog. Chis. Resh. Zad. Mat. Fiz., No. 1(15), 49–54 (1984).Google Scholar
  9. 9.
    E. G. Voronov, M. I. Kaplunov, V. I. Klenova et al., “A unified system for calculating the thermodynamic functions of the equation of state”.Vopr. Atom. Nauk. Tekh. Ser. Mat. Model. Fiz. Prots., No. 1, 44–47 (1993).Google Scholar
  10. 10.
    V. V. Nikiforov, “Turbulent mixing at the contact boundary of media with different densities”.Vopr. Atom. Nauk. Tekh. Ser. Teor. Prikl. Fiz., No. 1, 3–8 (1985).Google Scholar
  11. 11.
    N. F. Gavrilov, G. G. Ivanova, V. I. Selin, and V. N. Sofronov, “UP-OK program for solving one-dimensional problems of the mechanics of a continuous medium in a one-dimensional complex”.Vopr. Atom. Nauk. Tekh. Ser. Met. Prog. Chis. Resh. Zad. Mat. Fiz., No. 3(11), 11–14 (1982).Google Scholar
  12. 12.
    Third International Opacity Workshop and Code Comparison Study Work, MPR fur Quanteoptik, Garchin, August, 1995.Google Scholar

Copyright information

© Kluwer Academic/Plenum Publishers 2000

Authors and Affiliations

  • V. F. Kolesov
  • R. Ya. Gatilova
  • L. F. Gudarenko
  • G. G. Ivanova
  • T. G. Ivchenko
  • V. G. Kudel'kin
  • S. V. Mzhachikh
  • G. G. Farafontov
  • V. Kh. Khoruzhii

There are no affiliations available

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