Calibration of CFUL01 fission chambers in the standard neutron fields of the BR1 reactor at SCK CEN

Recent subcritical VENUS-F experiments showed that fission chambers with a threshold deposit like U-238 can essentially improve the on-line sub-criticality measurments with the beam interruption method, which is currently supposed to be the main method for the ADS MYRRHA. To suppress the uncertainty...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Kochetkov Anatoly, Krása Antonín, Borms Luc, Malambu Edouard, Vittiglio Guido, Wagemans Jan, Willems Jeroen
Formato:	article
Lenguaje:	EN
Publicado:	EDP Sciences 2021
Materias:	sub-critical monitoring u-238 fission chambers isotopic composition determination in br1 neutron fields Physics QC1-999
Acceso en línea:	https://doaj.org/article/43bdf76d018b4c71aa6a35523ae0322e
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:43bdf76d018b4c71aa6a35523ae0322e
record_format	dspace
spelling	oai:doaj.org-article:43bdf76d018b4c71aa6a35523ae0322e2021-12-02T17:12:46ZCalibration of CFUL01 fission chambers in the standard neutron fields of the BR1 reactor at SCK CEN2100-014X10.1051/epjconf/202125304025https://doaj.org/article/43bdf76d018b4c71aa6a35523ae0322e2021-01-01T00:00:00Zhttps://www.epj-conferences.org/articles/epjconf/pdf/2021/07/epjconf_animma2021_04025.pdfhttps://doaj.org/toc/2100-014XRecent subcritical VENUS-F experiments showed that fission chambers with a threshold deposit like U-238 can essentially improve the on-line sub-criticality measurments with the beam interruption method, which is currently supposed to be the main method for the ADS MYRRHA. To suppress the uncertainty caused by fissions in the U-235 impurities, the fraction of U-235 in the U deposit should be accurately known. Three PHOTONIS CFUL01 type fission chambers with U-238 deposit were purchased for sub-critical experiments in the VENUS-F reactor. To verify the purity of their deposits, the effective U-235 masses were measured in the empty cavity of the BR1 reactor with a well-known thermal neutron spectrum. It turned out that the measured effective U-235 mass in two fission chambers is lower than the declared mass (as it should be), but this is not the case for the third fission chamber. Then, the effective U-238 mass in these FCs was measured in the well-known fast spectrum of the MARK-III convertor in the BR1 reactor. Finally, the isotopic composition was obtained and it was found that the purity of two CFUL01 FCs is in agreement with the values declared in the certificates but it is not the case for the third fission chamber. As the length of the deposit is bigger than the length of the MARK-III convertor, necessary corrections were calculated with MCNP. The developed procedure using the BR1 standard irradiation fields can be applied for calibration and impurity determination of large fission chambers.Kochetkov AnatolyKrása AntonínBorms LucMalambu EdouardVittiglio GuidoWagemans JanWillems JeroenEDP Sciencesarticlesub-critical monitoringu-238 fission chambersisotopic composition determination in br1 neutron fieldsPhysicsQC1-999ENEPJ Web of Conferences, Vol 253, p 04025 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	sub-critical monitoring u-238 fission chambers isotopic composition determination in br1 neutron fields Physics QC1-999
spellingShingle	sub-critical monitoring u-238 fission chambers isotopic composition determination in br1 neutron fields Physics QC1-999 Kochetkov Anatoly Krása Antonín Borms Luc Malambu Edouard Vittiglio Guido Wagemans Jan Willems Jeroen Calibration of CFUL01 fission chambers in the standard neutron fields of the BR1 reactor at SCK CEN
description	Recent subcritical VENUS-F experiments showed that fission chambers with a threshold deposit like U-238 can essentially improve the on-line sub-criticality measurments with the beam interruption method, which is currently supposed to be the main method for the ADS MYRRHA. To suppress the uncertainty caused by fissions in the U-235 impurities, the fraction of U-235 in the U deposit should be accurately known. Three PHOTONIS CFUL01 type fission chambers with U-238 deposit were purchased for sub-critical experiments in the VENUS-F reactor. To verify the purity of their deposits, the effective U-235 masses were measured in the empty cavity of the BR1 reactor with a well-known thermal neutron spectrum. It turned out that the measured effective U-235 mass in two fission chambers is lower than the declared mass (as it should be), but this is not the case for the third fission chamber. Then, the effective U-238 mass in these FCs was measured in the well-known fast spectrum of the MARK-III convertor in the BR1 reactor. Finally, the isotopic composition was obtained and it was found that the purity of two CFUL01 FCs is in agreement with the values declared in the certificates but it is not the case for the third fission chamber. As the length of the deposit is bigger than the length of the MARK-III convertor, necessary corrections were calculated with MCNP. The developed procedure using the BR1 standard irradiation fields can be applied for calibration and impurity determination of large fission chambers.
format	article
author	Kochetkov Anatoly Krása Antonín Borms Luc Malambu Edouard Vittiglio Guido Wagemans Jan Willems Jeroen
author_facet	Kochetkov Anatoly Krása Antonín Borms Luc Malambu Edouard Vittiglio Guido Wagemans Jan Willems Jeroen
author_sort	Kochetkov Anatoly
title	Calibration of CFUL01 fission chambers in the standard neutron fields of the BR1 reactor at SCK CEN
title_short	Calibration of CFUL01 fission chambers in the standard neutron fields of the BR1 reactor at SCK CEN
title_full	Calibration of CFUL01 fission chambers in the standard neutron fields of the BR1 reactor at SCK CEN
title_fullStr	Calibration of CFUL01 fission chambers in the standard neutron fields of the BR1 reactor at SCK CEN
title_full_unstemmed	Calibration of CFUL01 fission chambers in the standard neutron fields of the BR1 reactor at SCK CEN
title_sort	calibration of cful01 fission chambers in the standard neutron fields of the br1 reactor at sck cen
publisher	EDP Sciences
publishDate	2021
url	https://doaj.org/article/43bdf76d018b4c71aa6a35523ae0322e
work_keys_str_mv	AT kochetkovanatoly calibrationofcful01fissionchambersinthestandardneutronfieldsofthebr1reactoratsckcen AT krasaantonin calibrationofcful01fissionchambersinthestandardneutronfieldsofthebr1reactoratsckcen AT bormsluc calibrationofcful01fissionchambersinthestandardneutronfieldsofthebr1reactoratsckcen AT malambuedouard calibrationofcful01fissionchambersinthestandardneutronfieldsofthebr1reactoratsckcen AT vittiglioguido calibrationofcful01fissionchambersinthestandardneutronfieldsofthebr1reactoratsckcen AT wagemansjan calibrationofcful01fissionchambersinthestandardneutronfieldsofthebr1reactoratsckcen AT willemsjeroen calibrationofcful01fissionchambersinthestandardneutronfieldsofthebr1reactoratsckcen
_version_	1718381373995089920

Calibration of CFUL01 fission chambers in the standard neutron fields of the BR1 reactor at SCK CEN

Ejemplares similares