High resolution measurements with miniature neutron scintillators in the SUR-100 zero power reactor

Three 1-mm3 miniature fiber-coupled scintillators have been used to perform cm-wise resolution measurements of the thermal neutron flux within experimental channels of the SUR-100 facility, a zero power thermal reactor operated by the Institute of Nuclear Technology and Energy Systems at the Univers...

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Autores principales:	Brunetto Edoardo L., Vitullo Fanny, Lamirand Vincent, Ambrožič Klemen, Godat Daniel, Buck Michael, Pohlner Georg, Starflinger Jörg, Pautz Andreas
Formato:	article
Lenguaje:	EN
Publicado:	EDP Sciences 2021
Materias:	scintillation detectors monte carlo simulations reaction rate profiles Physics QC1-999
Acceso en línea:	https://doaj.org/article/9c57734354814b8b8b5976cc4c9b25bb
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spelling	oai:doaj.org-article:9c57734354814b8b8b5976cc4c9b25bb2021-12-02T17:12:46ZHigh resolution measurements with miniature neutron scintillators in the SUR-100 zero power reactor2100-014X10.1051/epjconf/202125304029https://doaj.org/article/9c57734354814b8b8b5976cc4c9b25bb2021-01-01T00:00:00Zhttps://www.epj-conferences.org/articles/epjconf/pdf/2021/07/epjconf_animma2021_04029.pdfhttps://doaj.org/toc/2100-014XThree 1-mm3 miniature fiber-coupled scintillators have been used to perform cm-wise resolution measurements of the thermal neutron flux within experimental channels of the SUR-100 facility, a zero power thermal reactor operated by the Institute of Nuclear Technology and Energy Systems at the University of Stuttgart. The detection system is developed at the École Polytechnique Fédérale de Lausanne in collaboration with the Paul Scherrer Institut. Thermal neutrons count rates were measured along the experimental channels I and II, which cross the reactor at the center and tangentially to the core, respectively. The reactor was modelled with the Monte Carlo neutron transport code Serpent-2.1.31. The comparison of experimental and computed reaction rate distributions showed a good agreement within the core region, with discrepancies within 2σ. An unexpected discrepancy, probably caused by a geometric inconsistency in the computational model of the reactor, was observed in the reflector region of the experimental channel I, where a 20% difference (i.e. 8σ) was found between experimental and simulated results. Significant discrepancies, respectively worth 10σ and 15σ, were noticed at distance, in the lead shielding region, for both experimental channels I and II. In addition, reaction rate gradients across the 2.6 cm and 5.4 cm diameters of both channels were measured. A horizontal reaction rate gradient of (9.09 ± 0.20) % was measured within 2.4 cm across the diameter of the experimental channel II, with a difference from computed results of 2%. The absence of a vertical reaction rate gradient inside the experimental channel I was confirmed by measurements.Brunetto Edoardo L.Vitullo FannyLamirand VincentAmbrožič KlemenGodat DanielBuck MichaelPohlner GeorgStarflinger JörgPautz AndreasEDP Sciencesarticlescintillation detectorsmonte carlo simulationsreaction rate profilesPhysicsQC1-999ENEPJ Web of Conferences, Vol 253, p 04029 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	scintillation detectors monte carlo simulations reaction rate profiles Physics QC1-999
spellingShingle	scintillation detectors monte carlo simulations reaction rate profiles Physics QC1-999 Brunetto Edoardo L. Vitullo Fanny Lamirand Vincent Ambrožič Klemen Godat Daniel Buck Michael Pohlner Georg Starflinger Jörg Pautz Andreas High resolution measurements with miniature neutron scintillators in the SUR-100 zero power reactor
description	Three 1-mm3 miniature fiber-coupled scintillators have been used to perform cm-wise resolution measurements of the thermal neutron flux within experimental channels of the SUR-100 facility, a zero power thermal reactor operated by the Institute of Nuclear Technology and Energy Systems at the University of Stuttgart. The detection system is developed at the École Polytechnique Fédérale de Lausanne in collaboration with the Paul Scherrer Institut. Thermal neutrons count rates were measured along the experimental channels I and II, which cross the reactor at the center and tangentially to the core, respectively. The reactor was modelled with the Monte Carlo neutron transport code Serpent-2.1.31. The comparison of experimental and computed reaction rate distributions showed a good agreement within the core region, with discrepancies within 2σ. An unexpected discrepancy, probably caused by a geometric inconsistency in the computational model of the reactor, was observed in the reflector region of the experimental channel I, where a 20% difference (i.e. 8σ) was found between experimental and simulated results. Significant discrepancies, respectively worth 10σ and 15σ, were noticed at distance, in the lead shielding region, for both experimental channels I and II. In addition, reaction rate gradients across the 2.6 cm and 5.4 cm diameters of both channels were measured. A horizontal reaction rate gradient of (9.09 ± 0.20) % was measured within 2.4 cm across the diameter of the experimental channel II, with a difference from computed results of 2%. The absence of a vertical reaction rate gradient inside the experimental channel I was confirmed by measurements.
format	article
author	Brunetto Edoardo L. Vitullo Fanny Lamirand Vincent Ambrožič Klemen Godat Daniel Buck Michael Pohlner Georg Starflinger Jörg Pautz Andreas
author_facet	Brunetto Edoardo L. Vitullo Fanny Lamirand Vincent Ambrožič Klemen Godat Daniel Buck Michael Pohlner Georg Starflinger Jörg Pautz Andreas
author_sort	Brunetto Edoardo L.
title	High resolution measurements with miniature neutron scintillators in the SUR-100 zero power reactor
title_short	High resolution measurements with miniature neutron scintillators in the SUR-100 zero power reactor
title_full	High resolution measurements with miniature neutron scintillators in the SUR-100 zero power reactor
title_fullStr	High resolution measurements with miniature neutron scintillators in the SUR-100 zero power reactor
title_full_unstemmed	High resolution measurements with miniature neutron scintillators in the SUR-100 zero power reactor
title_sort	high resolution measurements with miniature neutron scintillators in the sur-100 zero power reactor
publisher	EDP Sciences
publishDate	2021
url	https://doaj.org/article/9c57734354814b8b8b5976cc4c9b25bb
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High resolution measurements with miniature neutron scintillators in the SUR-100 zero power reactor

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