Local and high distance neutron and gamma measurements of fuel rods oscillation experiments

We report in the present article on the successful observation using noise analysis of the lateral oscillation of one fuel rod by ±2.5 mm around nominal at 0.1 Hz frequency, using an mm3 miniature neutron scintillator at the rod level, and a BGO gamma detector seven meters away from the reactor core...

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Autores principales:	Lamirand Vincent, Pakari Oskari, Vitullo Fanny, Ambrožič Klemen, Godat Daniel, Frajtag Pavel, Pautz Andreas
Formato:	article
Lenguaje:	EN
Publicado:	EDP Sciences 2021
Materias:	reactor instrumentation miniature neutron detector neutron scintillator gamma scintillator reactor noise noise analysis zero power transfer function Physics QC1-999
Acceso en línea:	https://doaj.org/article/98e19c559fb54bf083cf715593b31735
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spelling	oai:doaj.org-article:98e19c559fb54bf083cf715593b317352021-12-02T17:12:46ZLocal and high distance neutron and gamma measurements of fuel rods oscillation experiments2100-014X10.1051/epjconf/202125304024https://doaj.org/article/98e19c559fb54bf083cf715593b317352021-01-01T00:00:00Zhttps://www.epj-conferences.org/articles/epjconf/pdf/2021/07/epjconf_animma2021_04024.pdfhttps://doaj.org/toc/2100-014XWe report in the present article on the successful observation using noise analysis of the lateral oscillation of one fuel rod by ±2.5 mm around nominal at 0.1 Hz frequency, using an mm3 miniature neutron scintillator at the rod level, and a BGO gamma detector seven meters away from the reactor core center. The experiment was conducted as part of the COLIBRI program in the CROCUS reactor, which is dedicated to the investigation of reactor noise induced by fuel vibrations. It consists in experiments on rod lateral displacement (static) and oscillation (dynamic) with different rods’ numbers at various relevant amplitudes and frequencies. Its main motivation is the increased amplitudes in the neutron noise distributions recorded in ex- and in-core detectors that have been observed in recent years in Siemens pre-Konvoi type of PWR reactors. The obtained experimental data are used for the purpose of code validation, especially within the framework of the European project CORTEX on reactor noise applications. During the first phase of COLIBRI, the observation of a spatial dependence of the perturbation noise, also called neutron modulation, was demonstrated. In the second phase of COLIBRI starting 2021, it is planned to use a core mapping array of neutron detectors to record its propagation. It consists in about 150 miniature scintillators coupled to optical fibers and SiPM readouts, to be distributed in the reactor core. As a feasibility test, experiments were performed using a miniature scintillator prototype placed on a fuel rod, and oscillating the instrumented rod or the one directly adjacent to the detector. In addition, it is theoretically possible to measure branching or perturbation reactor noise using gamma radiation. Following recent developments on gamma measurements in CROCUS, the fuel oscillation was simultaneously recorded with a gamma detection array, LEAF. Its large BGO detectors were used by placing them at the maximum distance to the core, i.e. seven meters away with a clear line of sight using an experimental channel through the shielding of the reactor cavity.Lamirand VincentPakari OskariVitullo FannyAmbrožič KlemenGodat DanielFrajtag PavelPautz AndreasEDP Sciencesarticlereactor instrumentationminiature neutron detectorneutron scintillatorgamma scintillatorreactor noisenoise analysiszero power transfer functionPhysicsQC1-999ENEPJ Web of Conferences, Vol 253, p 04024 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	reactor instrumentation miniature neutron detector neutron scintillator gamma scintillator reactor noise noise analysis zero power transfer function Physics QC1-999
spellingShingle	reactor instrumentation miniature neutron detector neutron scintillator gamma scintillator reactor noise noise analysis zero power transfer function Physics QC1-999 Lamirand Vincent Pakari Oskari Vitullo Fanny Ambrožič Klemen Godat Daniel Frajtag Pavel Pautz Andreas Local and high distance neutron and gamma measurements of fuel rods oscillation experiments
description	We report in the present article on the successful observation using noise analysis of the lateral oscillation of one fuel rod by ±2.5 mm around nominal at 0.1 Hz frequency, using an mm3 miniature neutron scintillator at the rod level, and a BGO gamma detector seven meters away from the reactor core center. The experiment was conducted as part of the COLIBRI program in the CROCUS reactor, which is dedicated to the investigation of reactor noise induced by fuel vibrations. It consists in experiments on rod lateral displacement (static) and oscillation (dynamic) with different rods’ numbers at various relevant amplitudes and frequencies. Its main motivation is the increased amplitudes in the neutron noise distributions recorded in ex- and in-core detectors that have been observed in recent years in Siemens pre-Konvoi type of PWR reactors. The obtained experimental data are used for the purpose of code validation, especially within the framework of the European project CORTEX on reactor noise applications. During the first phase of COLIBRI, the observation of a spatial dependence of the perturbation noise, also called neutron modulation, was demonstrated. In the second phase of COLIBRI starting 2021, it is planned to use a core mapping array of neutron detectors to record its propagation. It consists in about 150 miniature scintillators coupled to optical fibers and SiPM readouts, to be distributed in the reactor core. As a feasibility test, experiments were performed using a miniature scintillator prototype placed on a fuel rod, and oscillating the instrumented rod or the one directly adjacent to the detector. In addition, it is theoretically possible to measure branching or perturbation reactor noise using gamma radiation. Following recent developments on gamma measurements in CROCUS, the fuel oscillation was simultaneously recorded with a gamma detection array, LEAF. Its large BGO detectors were used by placing them at the maximum distance to the core, i.e. seven meters away with a clear line of sight using an experimental channel through the shielding of the reactor cavity.
format	article
author	Lamirand Vincent Pakari Oskari Vitullo Fanny Ambrožič Klemen Godat Daniel Frajtag Pavel Pautz Andreas
author_facet	Lamirand Vincent Pakari Oskari Vitullo Fanny Ambrožič Klemen Godat Daniel Frajtag Pavel Pautz Andreas
author_sort	Lamirand Vincent
title	Local and high distance neutron and gamma measurements of fuel rods oscillation experiments
title_short	Local and high distance neutron and gamma measurements of fuel rods oscillation experiments
title_full	Local and high distance neutron and gamma measurements of fuel rods oscillation experiments
title_fullStr	Local and high distance neutron and gamma measurements of fuel rods oscillation experiments
title_full_unstemmed	Local and high distance neutron and gamma measurements of fuel rods oscillation experiments
title_sort	local and high distance neutron and gamma measurements of fuel rods oscillation experiments
publisher	EDP Sciences
publishDate	2021
url	https://doaj.org/article/98e19c559fb54bf083cf715593b31735
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Local and high distance neutron and gamma measurements of fuel rods oscillation experiments

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