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SUMMARY:Nuclear Burning Wave Reactor - Sergii FOMIN
DTSTART:20260610T073000Z
DTEND:20260610T093000Z
DTSTAMP:20260610T153400Z
UID:indico-event-13872@indico.ijclab.in2p3.fr
DESCRIPTION:Nuclear Burning Wave Reactor\nSergii FOMIN\nAkhiezer Institute
  for Theoretical Physics\nNational Science Center “Kharkov Institute of 
 Physics & Technology”\, Kharkov\, Ukraine\nV.N. Karazin National Kharkiv
  University\nA fast breeder reactor operating in the self-sustaining nucle
 ar burning wave mode1-7 (NBW) is one of the most promising concepts for nu
 clear fission systems. The unique features of this mode\, which ensure the
  reactor's intrinsic safety at the deepest level\, are based on the absenc
 e of reactivity margins throughout its entire reactor campaign\, as well a
 s on a specific negative reactivity feedback mechanism. Critical condition
 s in such a reactor are maintained automatically\, without any external re
 activity control. Fuel for the NBW reactor\, except its startup\, can be n
 atural or even depleted uranium and thorium\, thereby solving the problem 
 of nuclear energy fuel resources for thousands of years to come. Such a re
 actor can operate for decades without refueling\, eliminating the risks of
  radiation accidents and theft of fissile materials during nuclear fuel tr
 ansportation and reprocessing. The ability to "afterburn" long-lived radio
 active waste (MA) from other reactors could help solve one of the most imp
 ortant environmental problems in nuclear energy.\nSignificant contribution
  to the development of this concept using different approaches was made by
  Lev Feoktistov1\, Edward Teller2\, Hiroshi Sekimoto3\, and others. The pr
 ivet company TerraPower created with financial support from Bill Gates4 ha
 s ambitious plan for the practical realization of this concept called the 
 Traveling Wave Reactor.\nIn contrast to the aforementioned works\, which f
 ocused on the study of steady-state of the NBW mode1\,3 or attempts of dir
 ect Monte Carlo simulation2\, we developed an original deterministic appro
 ach5-7\, which gives a possibility of investigations transient processes d
 uring reactor startup\, its forced shutdown\, and subsequent restart\, as 
 well as to study the stability of the NBV regime. Our approach is based on
  the numerical solution of the non-stationary equation of neutron diffusio
 n in a multiplying medium\, along with a set of burnup equations for fuel 
 components and nuclear kinetics equations for delayed neutron precursor nu
 clei. Recently\, we proposed a method for controlling the power of such a 
 reactor by varying the efficiency of its radial reflector. This presentati
 on invites discussion of the following topics:\n• The physical nature of
  slow nuclear burning phenomenon\n• Various approaches to describing nuc
 lear burning wave\n• Our computational model and FANTENS-2D code\n• Re
 sults of our calculations and main features of the NBW reactor \n• Stabi
 lity of the NBW mode and a special mechanism of the negative reactivity fe
 edback\n• Power control of the NBW reactor: transient processes at start
 up\, shutdown and restart\n• Unsolved problems and possible solutions\n
  \nReferences\n1. L.P. Feoktistov. Preprint IAE-4605-4\, 1988\; Sov. Phy
 s. Doklady\, 34 (1989) 1071.\n2. E. Teller. Nuclear Energy for the Third 
 Millennium. Preprint UCRL-JC-129547\, LLNL\, 1997.\n3. H. Sekimoto\, K. 
 Ryu\, Y. Yoshimura. Nucl. Sci. Engin. 139 (2001) 306.\n4. Bill Gates\, TE
 D\, February 12\, 2010. http://www.ted.com/talks/bill_gates.html \n5. S. 
 Fomin et al. Annals of Nuclear Energy\, 32 (2005) 1435\; 148 (2020) 107699
 .\n6. S. Fomin et al. Progress in Nuclear Energy\, 50 (2008) 163\; 53 (20
 11) 800.\n7. S. Fomin et al. Proceedings of the Int. Conf. “Global 2009
 ” Paper 9456\; “Global 2015” Paper 5254. Proceedings of the IC ”Fa
 st Reactors and Related Fuel Cycle” Paper CN-199-457 (2013)\; Paper CN-2
 91-365 (2022)\; Paper CN-343-79 (2026). \n\nhttps://indico.ijclab.in2p3.fr
 /event/13872/
LOCATION:108/1-XX - Grande Salle 108 (IJCLab)
URL:https://indico.ijclab.in2p3.fr/event/13872/
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