Analysis of the Signal over Noise Ratio of the hodoscope determined by Monte Carlo calculation

The CABRI experimental pulse reactor, located at the Cadarache nuclear research center, southern France, is devoted to the study of Reactivity Initiated Accidents (RIA) for the purpose of the CABRI International Program (CIP), managed by IRSN in the framework of an OECD/NEA agreement. The hodoscope...

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Autores principales:	Di Salvo J., Mirotta S., Chevalier V.
Formato:	article
Lenguaje:	EN
Publicado:	EDP Sciences 2021
Materias:	cabri hodoscope mcnp ria neutron transport Physics QC1-999
Acceso en línea:	https://doaj.org/article/1442c68cb8884d7389ae3587b200be73
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spelling	oai:doaj.org-article:1442c68cb8884d7389ae3587b200be732021-12-02T17:12:46ZAnalysis of the Signal over Noise Ratio of the hodoscope determined by Monte Carlo calculation2100-014X10.1051/epjconf/202125306001https://doaj.org/article/1442c68cb8884d7389ae3587b200be732021-01-01T00:00:00Zhttps://www.epj-conferences.org/articles/epjconf/pdf/2021/07/epjconf_animma2021_06001.pdfhttps://doaj.org/toc/2100-014XThe CABRI experimental pulse reactor, located at the Cadarache nuclear research center, southern France, is devoted to the study of Reactivity Initiated Accidents (RIA) for the purpose of the CABRI International Program (CIP), managed by IRSN in the framework of an OECD/NEA agreement. The hodoscope equipment installed in the CABRI reactor is an almost unique online fuel motion monitoring system, thanks to the measurement of the fast neutrons emitted during a power pulse by a tested rod positioned inside a dedicated test loop reproducing PWR conditions. This system is dedicated to the analysis of fuel displacement. Hence, one of the most important parameter measured by the hodoscope detectors is the Signal over Noise Ratio (SNR), characterizing the fraction of neutrons directly coming from the test rod (“signal”) over neutrons coming from the core (“noise”). It is interesting to calculate the SNR in order to define some quantitative criterions to improve hodoscope measurements and to understand if any modification linked to the test loop may significantly change this essential parameter. Another parameter of interest is the so-called “scattering coefficient”, which corresponds to the fraction of neutrons coming from the test rod and being scattered between their birth and their detection. This parameter is used to enhance the analysis of the fuel displacement which may happen during the power transient. In this article, the method used to calculate the SNR using MCNP6.2 Monte Carlo code will be detailed. Because the hodoscope detectors are located far away from the test rod (up to 4 meters), a 2D model of CABRI core and instrumentation has been implemented. No variance reduction techniques have been used to solve this problem in order to record the place of birth of neutron which contributes to the different scores with the goal to perform a detailed analysis of the SNR. This strategy allows to access numerically to the “scattering coefficient”. Finally, the comparison between calculated and measured SNR for a case study will be carried out. A quite good agreement between the 2D simulations and experiments recently performed in the CABRI reactor has been obtained.Di Salvo J.Mirotta S.Chevalier V.EDP Sciencesarticlecabrihodoscopemcnprianeutron transportPhysicsQC1-999ENEPJ Web of Conferences, Vol 253, p 06001 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	cabri hodoscope mcnp ria neutron transport Physics QC1-999
spellingShingle	cabri hodoscope mcnp ria neutron transport Physics QC1-999 Di Salvo J. Mirotta S. Chevalier V. Analysis of the Signal over Noise Ratio of the hodoscope determined by Monte Carlo calculation
description	The CABRI experimental pulse reactor, located at the Cadarache nuclear research center, southern France, is devoted to the study of Reactivity Initiated Accidents (RIA) for the purpose of the CABRI International Program (CIP), managed by IRSN in the framework of an OECD/NEA agreement. The hodoscope equipment installed in the CABRI reactor is an almost unique online fuel motion monitoring system, thanks to the measurement of the fast neutrons emitted during a power pulse by a tested rod positioned inside a dedicated test loop reproducing PWR conditions. This system is dedicated to the analysis of fuel displacement. Hence, one of the most important parameter measured by the hodoscope detectors is the Signal over Noise Ratio (SNR), characterizing the fraction of neutrons directly coming from the test rod (“signal”) over neutrons coming from the core (“noise”). It is interesting to calculate the SNR in order to define some quantitative criterions to improve hodoscope measurements and to understand if any modification linked to the test loop may significantly change this essential parameter. Another parameter of interest is the so-called “scattering coefficient”, which corresponds to the fraction of neutrons coming from the test rod and being scattered between their birth and their detection. This parameter is used to enhance the analysis of the fuel displacement which may happen during the power transient. In this article, the method used to calculate the SNR using MCNP6.2 Monte Carlo code will be detailed. Because the hodoscope detectors are located far away from the test rod (up to 4 meters), a 2D model of CABRI core and instrumentation has been implemented. No variance reduction techniques have been used to solve this problem in order to record the place of birth of neutron which contributes to the different scores with the goal to perform a detailed analysis of the SNR. This strategy allows to access numerically to the “scattering coefficient”. Finally, the comparison between calculated and measured SNR for a case study will be carried out. A quite good agreement between the 2D simulations and experiments recently performed in the CABRI reactor has been obtained.
format	article
author	Di Salvo J. Mirotta S. Chevalier V.
author_facet	Di Salvo J. Mirotta S. Chevalier V.
author_sort	Di Salvo J.
title	Analysis of the Signal over Noise Ratio of the hodoscope determined by Monte Carlo calculation
title_short	Analysis of the Signal over Noise Ratio of the hodoscope determined by Monte Carlo calculation
title_full	Analysis of the Signal over Noise Ratio of the hodoscope determined by Monte Carlo calculation
title_fullStr	Analysis of the Signal over Noise Ratio of the hodoscope determined by Monte Carlo calculation
title_full_unstemmed	Analysis of the Signal over Noise Ratio of the hodoscope determined by Monte Carlo calculation
title_sort	analysis of the signal over noise ratio of the hodoscope determined by monte carlo calculation
publisher	EDP Sciences
publishDate	2021
url	https://doaj.org/article/1442c68cb8884d7389ae3587b200be73
work_keys_str_mv	AT disalvoj analysisofthesignalovernoiseratioofthehodoscopedeterminedbymontecarlocalculation AT mirottas analysisofthesignalovernoiseratioofthehodoscopedeterminedbymontecarlocalculation AT chevalierv analysisofthesignalovernoiseratioofthehodoscopedeterminedbymontecarlocalculation
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Analysis of the Signal over Noise Ratio of the hodoscope determined by Monte Carlo calculation

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