caa a22 4500 475829492 CHVBK 20180406123837.0 cr unu---uuuuu 170329e20000501xx s 000 0 eng 10.1007/BF02680526 doi (NATIONALLICENCE)springer-10.1007/BF02680526 Positive reactivity effect in hollow critical assemblies with moderated neutrons [Elektronische Daten] [V. Kolesov, R. Gatilova, L. Gudarenko, G. Ivanova, T. Ivchenko, V. Kudel'kin, S. Mzhachikh, G. Farafontov, V. Khoruzhii] 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. Kluwer Academic/Plenum Publishers, 2000 Kolesov V. aut Gatilova R. aut Gudarenko L. aut Ivanova G. aut Ivchenko T. aut Kudel'kin V. aut Mzhachikh S. aut Farafontov G. aut Khoruzhii V. aut Atomic Energy Springer US 88/5(2000-05-01), 337-344 1063-4258 88:5<337 2000 88 10512 https://doi.org/10.1007/BF02680526 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02680526 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kolesov V. aut NATIONALLICENCE 700 1- Gatilova R. aut NATIONALLICENCE 700 1- Gudarenko L. aut NATIONALLICENCE 700 1- Ivanova G. aut NATIONALLICENCE 700 1- Ivchenko T. aut NATIONALLICENCE 700 1- Kudel'kin V. aut NATIONALLICENCE 700 1- Mzhachikh S. aut NATIONALLICENCE 700 1- Farafontov G. aut NATIONALLICENCE 700 1- Khoruzhii V. aut NATIONALLICENCE 773 0- Atomic Energy Springer US 88/5(2000-05-01), 337-344 1063-4258 88:5<337 2000 88 10512 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer