Measuring the delayed neutrons multiplicity and kinetic parameters for the thermal induced fission of 235U, 239Pu and 233U

In the normal operation of nuclear reactors, the kinetic behavior of the neutron population in the core is driven by the so-called delayed neutrons (DN). The DN yield per fission, their average lifetime and their groups’ abundances are the main physical parameters used to predict the kinetic behavio...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Geslot Benoit, Sardet Alix, Casoli Pierre, Leconte Pierre, De Izarra Grégoire, Chebboubi Abdelhazize, Kessedjian Grégoire, Méplan Olivier, Doré Diane, Soldner Torsten, Mutti Paolo
Formato:	article
Lenguaje:	EN
Publicado:	EDP Sciences 2021
Materias:	delayed neutrons fission chambers 3he proportional counters fissile isotopes uranium 235 uranium 233 plutonium 239 Physics QC1-999
Acceso en línea:	https://doaj.org/article/0141c74deed545f1a88ab369060626a4
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:0141c74deed545f1a88ab369060626a4
record_format	dspace
spelling	oai:doaj.org-article:0141c74deed545f1a88ab369060626a42021-12-02T17:12:45ZMeasuring the delayed neutrons multiplicity and kinetic parameters for the thermal induced fission of 235U, 239Pu and 233U2100-014X10.1051/epjconf/202125301004https://doaj.org/article/0141c74deed545f1a88ab369060626a42021-01-01T00:00:00Zhttps://www.epj-conferences.org/articles/epjconf/pdf/2021/07/epjconf_animma2021_01004.pdfhttps://doaj.org/toc/2100-014XIn the normal operation of nuclear reactors, the kinetic behavior of the neutron population in the core is driven by the so-called delayed neutrons (DN). The DN yield per fission, their average lifetime and their groups’ abundances are the main physical parameters used to predict the kinetic behavior of the reactor and its reactivity. The overall uncertainty associated to reactivity predictions, which is linked directly to the nuclear reactor safety margins, is thus closely dependent on a few parameters associated with DN. Depending on the nuclear data library, DN kinetic parameters present significant discrepancies, even for major fissile isotopes such as 235U or 239Pu. In this context, CEA has long been working for improving DN nuclear data. In 2018, CEA launched the ALDEN project (Average Lifetime of DElayed Neutrons) in the framework of a collaboration between CEA/DES, CEA/DRF, CNRS/IN2P3 (LPSC, CENBG, LPC), ENSICAEN and Caen University. This program aims at measuring the kinetics of the delayed neutrons to derive the DN yield, their average lifetime and abundances. Two experimental campaigns focusing on the thermal fission of 235U were conducted in 2018 and 2019. They demonstrated the concept feasibility and gave high quality estimations of the DN multiplicity (1.631 ± 0.014 %) and average lifetime (8.82 ± 0.6 s) for 235U. More recently in March 2021, a more ambitious irradiation campaign was conducted on 239Pu and 233U. This paper details the new experimental setup, which was upgraded to meet ILL safety requirements for handling plutonium. The data analysis process is presented, with a focus on the problem of dead time correction. Finally, some preliminary delayed neutron decay curves are showed and discussed.Geslot BenoitSardet AlixCasoli PierreLeconte PierreDe Izarra GrégoireChebboubi AbdelhazizeKessedjian GrégoireMéplan OlivierDoré DianeSoldner TorstenMutti PaoloEDP Sciencesarticledelayed neutronsfission chambers3he proportional countersfissile isotopesuranium 235uranium 233plutonium 239PhysicsQC1-999ENEPJ Web of Conferences, Vol 253, p 01004 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	delayed neutrons fission chambers 3he proportional counters fissile isotopes uranium 235 uranium 233 plutonium 239 Physics QC1-999
spellingShingle	delayed neutrons fission chambers 3he proportional counters fissile isotopes uranium 235 uranium 233 plutonium 239 Physics QC1-999 Geslot Benoit Sardet Alix Casoli Pierre Leconte Pierre De Izarra Grégoire Chebboubi Abdelhazize Kessedjian Grégoire Méplan Olivier Doré Diane Soldner Torsten Mutti Paolo Measuring the delayed neutrons multiplicity and kinetic parameters for the thermal induced fission of 235U, 239Pu and 233U
description	In the normal operation of nuclear reactors, the kinetic behavior of the neutron population in the core is driven by the so-called delayed neutrons (DN). The DN yield per fission, their average lifetime and their groups’ abundances are the main physical parameters used to predict the kinetic behavior of the reactor and its reactivity. The overall uncertainty associated to reactivity predictions, which is linked directly to the nuclear reactor safety margins, is thus closely dependent on a few parameters associated with DN. Depending on the nuclear data library, DN kinetic parameters present significant discrepancies, even for major fissile isotopes such as 235U or 239Pu. In this context, CEA has long been working for improving DN nuclear data. In 2018, CEA launched the ALDEN project (Average Lifetime of DElayed Neutrons) in the framework of a collaboration between CEA/DES, CEA/DRF, CNRS/IN2P3 (LPSC, CENBG, LPC), ENSICAEN and Caen University. This program aims at measuring the kinetics of the delayed neutrons to derive the DN yield, their average lifetime and abundances. Two experimental campaigns focusing on the thermal fission of 235U were conducted in 2018 and 2019. They demonstrated the concept feasibility and gave high quality estimations of the DN multiplicity (1.631 ± 0.014 %) and average lifetime (8.82 ± 0.6 s) for 235U. More recently in March 2021, a more ambitious irradiation campaign was conducted on 239Pu and 233U. This paper details the new experimental setup, which was upgraded to meet ILL safety requirements for handling plutonium. The data analysis process is presented, with a focus on the problem of dead time correction. Finally, some preliminary delayed neutron decay curves are showed and discussed.
format	article
author	Geslot Benoit Sardet Alix Casoli Pierre Leconte Pierre De Izarra Grégoire Chebboubi Abdelhazize Kessedjian Grégoire Méplan Olivier Doré Diane Soldner Torsten Mutti Paolo
author_facet	Geslot Benoit Sardet Alix Casoli Pierre Leconte Pierre De Izarra Grégoire Chebboubi Abdelhazize Kessedjian Grégoire Méplan Olivier Doré Diane Soldner Torsten Mutti Paolo
author_sort	Geslot Benoit
title	Measuring the delayed neutrons multiplicity and kinetic parameters for the thermal induced fission of 235U, 239Pu and 233U
title_short	Measuring the delayed neutrons multiplicity and kinetic parameters for the thermal induced fission of 235U, 239Pu and 233U
title_full	Measuring the delayed neutrons multiplicity and kinetic parameters for the thermal induced fission of 235U, 239Pu and 233U
title_fullStr	Measuring the delayed neutrons multiplicity and kinetic parameters for the thermal induced fission of 235U, 239Pu and 233U
title_full_unstemmed	Measuring the delayed neutrons multiplicity and kinetic parameters for the thermal induced fission of 235U, 239Pu and 233U
title_sort	measuring the delayed neutrons multiplicity and kinetic parameters for the thermal induced fission of 235u, 239pu and 233u
publisher	EDP Sciences
publishDate	2021
url	https://doaj.org/article/0141c74deed545f1a88ab369060626a4
work_keys_str_mv	AT geslotbenoit measuringthedelayedneutronsmultiplicityandkineticparametersforthethermalinducedfissionof235u239puand233u AT sardetalix measuringthedelayedneutronsmultiplicityandkineticparametersforthethermalinducedfissionof235u239puand233u AT casolipierre measuringthedelayedneutronsmultiplicityandkineticparametersforthethermalinducedfissionof235u239puand233u AT lecontepierre measuringthedelayedneutronsmultiplicityandkineticparametersforthethermalinducedfissionof235u239puand233u AT deizarragregoire measuringthedelayedneutronsmultiplicityandkineticparametersforthethermalinducedfissionof235u239puand233u AT chebboubiabdelhazize measuringthedelayedneutronsmultiplicityandkineticparametersforthethermalinducedfissionof235u239puand233u AT kessedjiangregoire measuringthedelayedneutronsmultiplicityandkineticparametersforthethermalinducedfissionof235u239puand233u AT meplanolivier measuringthedelayedneutronsmultiplicityandkineticparametersforthethermalinducedfissionof235u239puand233u AT dorediane measuringthedelayedneutronsmultiplicityandkineticparametersforthethermalinducedfissionof235u239puand233u AT soldnertorsten measuringthedelayedneutronsmultiplicityandkineticparametersforthethermalinducedfissionof235u239puand233u AT muttipaolo measuringthedelayedneutronsmultiplicityandkineticparametersforthethermalinducedfissionof235u239puand233u
_version_	1718381359199682560

Measuring the delayed neutrons multiplicity and kinetic parameters for the thermal induced fission of 235U, 239Pu and 233U

Ejemplares similares