Kinetic Parameter Measurements in the MINERVE Reactor

Perret, G.; Geslot, B.; Gruel, A.; Blaise, Patrick; Di-Salvo, J.; Izarra, Grégoire de; Jammes, C.; Hursin, Mathieu; Pautz, Andreas

doi:10.1109/tns.2016.2637569

Cited by 12 publications

(5 citation statements)

References 24 publications

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“…By calculating the Fourier transform of auto-and cross-correlation functions of a detector signal, the reactor noise at criticality can be fitted by the following general expression in dependency of the angular frequency ω [4,8,9,10]:…”

Section: B Power Spectral Density Noise Analysismentioning

confidence: 99%

“…The kinetic parameters of the CROCUS zero power reactor core have been successfully determined using reactivity change [1] and non-invasive neutron noise measurements with the Feynman-α and auto and cross power spectral density (APSD/CPSD) methods [2,3]. The measurement station was also successfully used in the MINERVE zero power facility [4]. The previous measurements in CROCUS were undertaken with several sub-critical and critical states with powers up to 0.1 W with four BF3 neutron detectors in the control rod and peripheral fuel rod positions (see Fig.…”

Section: Introductionmentioning

confidence: 99%

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Current Mode Neutron Noise Measurements in the Zero Power Reactor CROCUS

Pakari

Lamirand²,

Perret

et al. 2018

EPJ Web Conf.

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Abstract-The present article is an overview of developments and results regarding neutron noise measurements in current mode at the CROCUS zero power facility. Neutron noise measurements offer a non-invasive method to determine kinetic reactor parameters such as the prompt decay constant at criticality α = βeff / Λ, the effective delayed neutron fraction βeff, and the mean generation time Λ for code validation efforts. At higher detection rates, i.e. above 2×10 4 cps in the used configuration at 0.1 W, the previously employed pulse charge amplification electronics with BF3 detectors yielded erroneous results due to dead time effects. Future experimental needs call for higher sensitivity in detectors, higher detection rates or higher reactor powers, and thus a generally more versatile measurement system. We, therefore, explored detectors operated with current mode acquisition electronics to accommodate the need. We approached the matter in two ways: 1) By using the two compensated , also within 1σ agreement. The improvements to previous neutron noise measurements include shorter measurement durations that can achieve comparable statistical uncertainties and measurements at higher detection rates.

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Section: B Power Spectral Density Noise Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Current Mode Neutron Noise Measurements in the Zero Power Reactor CROCUS

Pakari

Lamirand²,

Perret

et al. 2018

EPJ Web Conf.

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“…The experiments were held during Sep. 2014, on the MINERVE reactor Perret et al (2017), using the MAESTRO core configuration. The MINERVE reactor, a part of the CEA Cadarche complex, is a water moderated ZPR.…”

Section: Core Settingmentioning

confidence: 99%

“…The outline of the present study is to validate the results introduced experimentally. The experimental validation was done on a set measurements taken at the MINERVE reactor (Perret et al, 2017), during a noise measurement campaign, held in Sep. 2014. Results indicate a very good correspondence between the experimental results and the analytic prediction.…”

Section: Introductionmentioning

confidence: 99%

Experimental validation of analytic formulas for the statistical uncertainty in the Feynman-αmethod

Dubi¹,

Kolin²,

Blaise

et al. 2017

Annals of Nuclear Energy

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“…A demonstração algébrica para a obtenção da equação (14) a partir da equação (11) está descrita no Anexo B deste trabalho. Deve-se ressaltar que também foram incluídos os testes de consistência que satisfazem a condição da equação do segundo grau da equação (14). Os valores dos parâmetros utilizados nos testes de consistência foram obtidos experimentalmente para os refletores de água leve, aço inox e água pesada.…”

Section: Ruído Do Reatorunclassified

Determinação experimental e análise dos tempos de geração de nêutrons do núcleo e do refletor e da fração de retorno do refletor em várias configurações do reator IPEN/MB-01 e seus impactos na determinação da reatividade do sistema

Gonnelli¹

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This work proposes the development of a new methodology for measurement of the reactivity in the IPEN/MB-01 research reactor facility, based on microscopic and macroscopic noise experiments and the Two-Region point kinetic equations model. Differently from the other point kinetic theoretical models, the Two-Region model assumed in this work takes into account the nuclear reactor how a coupled system, which constitute the theoretical basis of all mathematical development, contemplate both regions of the reactor (core and reflector).The study of the reflector effect and its impact in the reactivity is an original fact and, to make possible the viability of this study, the kinetic parameters related to the reflector must be obtained. The main advantage of this new methodology is to obtain the kinetic parameters from the reflector in a purely experimental way. In order to validate this new method, a series of experiments involving different types of reflectors was performed in the IPEN/MB-01 reactor. The reflectors constituted by Light Water, Stainless Steel (SS-304) and Heavy Water were employed. The Rossi-α neutron noise technique were applied in several subcritical states to obtain the parameters of the reflector. Furthermore, the Auto Power Spectral Densities were also used for a comparison between the experimental data. Moreover, the MCNP-5 nuclear reactor physics code with the ENDF/B-VII.0 library neutron data was employed to calculate the reactivity through the k eff multiplication factor for each experimental configuration. In this way, from the Two-Region point kinetic equations model were obtained the theoretical expressions in which were used for least squares fit of the experimental data. The neutron lifetimes in the reflector (τ r) and in the core (τ C), and the v neutron return fraction from the reflector to the core (f) were obtained as least squares fitted parameters and then employed for the reactivity calculation through the Inhour two region equation. The presented experimental and theoretical results are referring to the standard core configuration with aforementioned reflectors of Light Water, Stainless Steel (SS-304) and Heavy Water. For all experiments the 26x28 fuel rod configuration was employed with the detectors operating in pulse mode.

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Kinetic Parameter Measurements in the MINERVE Reactor

Cited by 12 publications

References 24 publications

Current Mode Neutron Noise Measurements in the Zero Power Reactor CROCUS

Current Mode Neutron Noise Measurements in the Zero Power Reactor CROCUS

Experimental validation of analytic formulas for the statistical uncertainty in the Feynman-αmethod

Determinação experimental e análise dos tempos de geração de nêutrons do núcleo e do refletor e da fração de retorno do refletor em várias configurações do reator IPEN/MB-01 e seus impactos na determinação da reatividade do sistema

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