Reactor noise in accelerator driven systems

Degweker, S.B.

doi:10.1016/s0306-4549(02)00051-8

Cited by 41 publications

(12 citation statements)

References 11 publications

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“…At a theoretical level, we believe, that the principal difference between ADS and critical reactor noise is due to the accelerator characteristics [29,30]. In general, whatever may be the kind of accelerator actually used for any experimental or demonstration ADS, it cannot be tacitly assumed that the source events would constitute a stochastic Poisson point process.…”

Section: The Physics Of Accelerator Driven Sub-critical Reactorsmentioning

confidence: 99%

“…There have also been suggestions regarding the use of noise techniques for monitoring the sub-criticality of ADS. In view of the above, several theoretical studies on various noise techniques for ADS [25][26][27][28][29][30][31][32] have appeared of late. In the initial years, the most important difference perceived between critical reactors and ADS [25][26][27][28] was that the spallation reaction would produce a large number of neutrons at the same time in what could be called as a source event.…”

Section: Theoretical Studies On Reactor Noise In Adsmentioning

confidence: 99%

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The physics of accelerator driven sub-critical reactors

et al. 2007

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In recent years, there has been an increasing worldwide interest in accelerator driven systems (ADS) due to their perceived superior safety characteristics and their potential for burning actinides and long-lived fission products. Indian interest in ADS has an additional dimension, which is related to our planned large-scale thorium utilization for future nuclear energy generation.The physics of ADS is quite different from that of critical reactors. As such, physics studies on ADS reactors are necessary for gaining an understanding of these systems. Development of theoretical tools and experimental facilities for studying the physics of ADS reactors constitute important aspect of the ADS development program at BARC. This includes computer codes for burnup studies based on transport theory and Monte Carlo methods, codes for studying the kinetics of ADS and sub-critical facilities driven by 14 MeV neutron generators for ADS experiments and development of sub-criticality measurement methods. The paper discusses the physics issues specific to ADS reactors and presents the status of the reactor physics program and some of the ADS concepts under study.

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Section: The Physics Of Accelerator Driven Sub-critical Reactorsmentioning

confidence: 99%

Section: Theoretical Studies On Reactor Noise In Adsmentioning

confidence: 99%

The physics of accelerator driven sub-critical reactors

et al. 2007

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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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“…Following these studies, the formulae for pulse-mode operation that is one of the candidates for practical ADS were derived. [14][15][16][17][18][19] Many theoretical studies on stochastic methods have been published as mentioned above, while the experimental study has been scarcely reported. Kitamura et al 20) carried out a series of variance-to-mean experiments in a subcritical assembly driven by a pulsed 14 MeV neutron generator, and demonstrated the applicability of their formula.…”

Section: Introductionmentioning

confidence: 99%

Determination of Subcritical Reactivity of a Thermal Accelerator-Driven System from Beam Trip and Restart Experiment

Taninaka

Hashimoto

Pyeon

et al. 2011

Journal of Nuclear Science and Technology

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An experimental technique based on an accelerator-beam trip or restart operation is proposed to determine the subcritical reactivity of an accelerator-driven system (ADS). Applying the least-squares inverse kinetics method to the data analysis, the subcriticality can be inferred from time-sequence neutron count data after these operations. A series of beam trip and restart experiments with 14 MeV neutrons were carried out in a thermal ADS of Kyoto University Critical Assembly (KUCA), to demonstrate the applicability of the proposed technique. The subcriticalities evaluated using neutron counters far from the DT target were consistent with those obtained in a previous pulsed neutron experiment. However, a counter placed close to the target significantly overestimated the subcriticality. The present technique is expected to be available for subcriritcality measurement at startup and shutdown of various ADSs.

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Reactor noise in accelerator driven systems

Cited by 41 publications

References 11 publications

The physics of accelerator driven sub-critical reactors

The physics of accelerator driven sub-critical reactors

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

Determination of Subcritical Reactivity of a Thermal Accelerator-Driven System from Beam Trip and Restart Experiment

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