Two-group theory of neutron noise in Molten Salt Reactors

Jönsson, Anders; Pázsit, Imre

doi:10.1016/j.anucene.2011.02.013

Cited by 15 publications

(6 citation statements)

References 10 publications

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“…8 for the four cores. Several features of these spectra show similarities with the corresponding MSR calculations by Jonsson and Pázsit (2011). One is the spectral ratio of the noise, which also follows from the results shown earlier in this paper for the Green's functions (Fig.…”

Section: Frequency Dependence Of the Propagation Noisesupporting

confidence: 86%

“…The investigations presented in this paper show that most of the properties of the fast and thermal propagation noise, found in recent work regarding molten salt reactors Jonsson and Pázsit (2011) is also present in traditional reactors, i.e. they are not a consequence of the propagating fuel and hence the propagating delayed neutron precursors and the accompanying difference in the dynamics of an MSR and a traditional core.…”

Section: Conclusion Further Workmentioning

confidence: 64%

“…The main motivation for the present study was to investigate the space and frequency dependence of the propagation noise, i.e. the neutron noise induced by a propagating perturbation, in systems of various spectral properties, and whenever feasible, compare it with the result of similar calculations performed recently by Jonsson and Pázsit (2011). The origin of the interest in propagating noise lies in the characteristics of the neutron noise induced by inlet temperature fluctuations propagating with the coolant of a PWR, and the noise induced by the two-phase flow, propagating with the coolant of a BWR.…”

Section: Investigation Of the Propagation Noisementioning

confidence: 99%

“…In such reactors the circulation of the fuel is likely to induce propagating perturbations due to inhomogeneities in the density/temperature, fuel concentration in the salt, locally slightly varying burnup in the fuel etc. The propagation noise induced by such perturbations was investigated in some recent publications (Pázsit and Jonsson, 2010;Jonsson and Pázsit, 2011).…”

Section: Introductionmentioning

confidence: 99%

“…This way the present study can also be considered as the first attempt to study the applicability of noise analysis to systems significantly different from the LWR cores dominating in quantitative studies of noise diagnostics so far, as well as the first attempt to study the spectral properties of the induced neutron noise in a two-group model. The present study also serves to clarify the significance of the core properties and that of the fuel propagation, through calculating the propagation noise in cores with static fuel in the four different reactor systems ranging from Gen-II to GEN-IV characteristics and comparing it with the results obtained in the MSR study of Jonsson and Pázsit (2011). One result of these investigations is that in fast systems the neutron noise in the fast group (the "fast noise") has a much larger amplitude than that of the thermal noise, and hence it can be utilised in fast system for diagnostic purposes.…”

Section: Introductionmentioning

confidence: 99%

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Qualitative and quantitative investigation of the propagation noise in various reactor systems

Dykin

Jönsson

Pázsit

2014

Progress in Nuclear Energy

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The space-dependent neutron noise, induced by propagating perturbations (propagation noise for short) is investigated in a one-dimensional homogeneous model of various reactor systems. By using two-group theory, the noise in both the fast and the thermal group is calculated. The purpose is to investigate the dependence of the properties of the space-dependent fast and thermal propagation noise on the static neutron spectrum as well as on the presence of the fluctuations of several cross sections. The motivation for this study arose in connection with recent work on neutron noise in molten salt reactors (MSR) with propagating fuel of various compositions. Some new features of the induced noise were observed, but it was not clear whether these were due to the propagating perturbation alone, or to the propagation of the fuel and hence that of the delayed neutron precursors. The present study serves to clarify the significance of the spectral properties of the different cores through calculating the propagation noise in four different reactor systems, as well as considering the influence of the perturbation of the various cross sections. By comparing the results with those obtained in MSR, the effect of the moving fuel on the propagation noise is clarified. It is shown that in fast systems the noise in the fast group is much larger than in the thermal group and hence can gain diagnostic importance. It is also shown that the coexistence of several cross section fluctuations leads to qualitatively and quantitatively new characteristics of the noise, hence it is important to model the effect of e.g. temperature fluctuations of the coolant in a proper way.

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Section: Frequency Dependence Of the Propagation Noisesupporting

confidence: 86%

Section: Conclusion Further Workmentioning

confidence: 64%

Section: Investigation Of the Propagation Noisementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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