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Remark on the neutron noise induced by propagating perturbations in an MSR

Victor Dykin (Institutionen för fysik, Subatomär fysik och plasmafysik (Chalmers)) ; Imre Pázsit (Institutionen för fysik, Subatomär fysik och plasmafysik (Chalmers)) ; Richard Sanchez (Institutionen för fysik, Subatomär fysik och plasmafysik (Chalmers))
Annals of Nuclear Energy (0306-4549). Vol. 90 (2016), p. 93-105.
[Artikel, refereegranskad vetenskaplig]

The neutron noise induced by propagating perturbations in a simple model of a Molten Salt Reactor (MSR) is calculated and analyzed using one/two-group diffusion theory. The novelty, as compared to previous works, is that the noise source includes also the fluctuations of the fission cross sections and the fluid velocity, in addition to the previous case when only the fluctuations of the absorption cross section were accounted for. Another novelty is that the solution is obtained through the matrix Green's function of the flux and precursor equations, these two being kept separate. Inclusion of each of these two new noise sources leads to a structure of the noise source, and hence also that of the neutron noise, which is conceptually different from the case when only the fluctuations of the absorption cross sections are treated, with some surprising features. The use of the matrix Green's function is advantageous to understand the new features, and it helps to point out some new aspects of the neutron noise even in traditional systems, which have not been noticed before. The results contribute to the understanding and interpretation of the neutron noise in MSRs. (C) 2015 Elsevier Ltd. All rights reserved.

Nyckelord: Neutron noise, MSR, Propagating perturbations, Greens function, Fuel velocity fluctuations



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Denna post skapades 2016-03-16. Senast ändrad 2016-04-15.
CPL Pubid: 233290

 

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Institutioner (Chalmers)

Institutionen för fysik, Subatomär fysik och plasmafysik (Chalmers)

Ämnesområden

Energi
Subatomär fysik

Chalmers infrastruktur