Reactor noise in accelerator driven systems – II

Degweker, S.B.; Rana, Y. S.

doi:10.1016/j.anucene.2007.02.011

Cited by 28 publications

(15 citation statements)

References 19 publications

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“…provided that at the time moment t = 0 one fast neutron was in the system. It is easy to prove that the probabilities Z (1) ( j, un 1 ), Z (2) (k, un 2 ), and Z (3) ( , u | n 3 ) are given by the following formulae:…”

Section: Detection In the Time Intervalmentioning

confidence: 99%

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Two-Group Theory of the Feynman-Alpha Method for Reactivity Measurement in ADS

Пал

Pázsit

2012

Science and Technology of Nuclear Installations

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The theory of the Feynman-alpha method, which is used to determine the subcritical reactivity of systems driven by an external source such as an ADS, is extended to two energy groups with the inclusion of delayed neutrons. This paper presents a full derivation of the variance to mean formula with the inclusion of two energy groups and delayed neutrons. The results are illustrated quantitatively and discussed in physical terms.

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Section: Detection In the Time Intervalmentioning

confidence: 99%

“…An overview of the field can be found in [2]. The most general treatment of all the above mentioned cases is found in Degweker and Rana [3] and Rana and Degweker [4,5].…”

Section: Introductionmentioning

confidence: 99%

Two-Group Theory of the Feynman-Alpha Method for Reactivity Measurement in ADS

Пал

Pázsit

2012

Science and Technology of Nuclear Installations

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“…Among the various methods being studied for this purpose, those based on noise analysis are also under consideration. Reflecting this renewed interest in noise based methods for sub criticality measurement, there has been a large amount of theoretical work (Degweker, 2000(Degweker, , 2003Degweker and Rana, 2007;Pázsit and Yamane, 1999;Pázsit et al, 2005;Kitamura et al, 2005;Munoz-Cobo et al, 2008, 2011Ballester and Muñoz-Cobo, 2005) in this area in the last one and a half decade.…”

Section: Introductionmentioning

confidence: 99%

On the relation between Rossi alpha and Feynman alpha methods

Degweker

Rudra

2016

Annals of Nuclear Energy

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“…Degweker [20,21] formulated the power spectral density for a pulsed spallation neutron source. When the multiplicity of the spallation source is excluded, his formulae are reduced to Equations (24) and (25).…”

Section: Power Spectral Density For Neutron Detectionmentioning

confidence: 99%

“…Degweker [20,21] formulated a cross-power spectral density for a periodic and pulsed neutron source. His theory showed that the cross-power spectral density between time-sequence signal data of two neutron detectors was composed of a correlated reactor noise component and many uncorrelated delta-function peaks at the integral multiple of pulse repetition frequency.…”

mentioning

confidence: 99%

Power spectral analysis for a thermal subcritical reactor system driven by a pulsed 14 MeV neutron source

Sakon

Hashimoto

Sugiyama

et al. 2013

Journal of Nuclear Science and Technology

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A series of power spectral analyses for a thermal subcritical reactor system driven by a pulsed 14 MeV neutron source was carried out at Kyoto University Critical Assembly (KUCA), to determine the promptneutron decay constant of the accelerator-driven system (ADS). The cross-power spectral density between time-sequence signal data of two neutron detectors was composed of a familiar continuous reactor noise component and many delta-function-like peaks at the integral multiple of pulse repetition frequency. The prompt-neutron decay constant inferred from the reactor noise component of the cross-power spectral density was consistent with that obtained by a pulsed neutron experiment. However, the reactor noise component of the auto-power spectral density of each detector was hidden by a white chamber noise in the higher-frequency range and this feature resulted in a considerable underestimation of the decay constant. For several runs with a low pulse-repetition frequency, furthermore, we attempted to infer the decay constant from point data of the delta-function-like peaks. The analysis for a run under a slightly subcritical state resulted in the consistent decay constant; however, those for other runs under significantly subcritical states underestimated the decay constant. Considering the contribution of a spatially higher mode to the point data, the above underestimation was solved to obtain the consistent decay constant. While the Feynman-α formula for a pulsed neutron source is too complicated to be fitted directly to variance-to-mean ratio data, the present analysis on frequency domain is much simpler and the conventional formula based on the first-order reactor transfer function is available for fitting to power spectral density data.

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Reactor noise in accelerator driven systems – II

Cited by 28 publications

References 19 publications

Two-Group Theory of the Feynman-Alpha Method for Reactivity Measurement in ADS

Two-Group Theory of the Feynman-Alpha Method for Reactivity Measurement in ADS

On the relation between Rossi alpha and Feynman alpha methods

Power spectral analysis for a thermal subcritical reactor system driven by a pulsed 14 MeV neutron source

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