Application of the CAB evaluation of thermal scattering law for heavy water to ZED-2 critical benchmarks at room temperature

Autores
Roubtsov, D.; Chow, J. C.; Marquez Damian, Jose Ignacio; Granada, Jose Rolando
Año de publicación
2017
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
To improve the evaluations in thermal scattering sub-libraries, a set of thermal neutron scattering cross sections (scattering kernels) was developed recently at Centro Atómico Bariloche (CAB) for deuterium and oxygen bound in liquid heavy water, and made available in the ENDF-6 format. These libraries are based on a combination of results of molecular dynamics (MD) simulations and recent experimental data and, when used, result in an improvement of calculations of observables of single neutron scattering experiments, compared to results based on previous evaluations. In this work, we provide additional details on the CAB evaluation of heavy water at room temperature and discuss the important integral characteristics of neutron scattering kernels, such as the cross sections, average scattering cosine, and average secondary energy. Then, the new set of thermal scattering kernels is applied in modelling criticality of the ZED-2 reactor, and the international benchmarks LEU-MET-THERM-003 (ICSBEP handbook) and ZED2-HWR-EXP-001 (IRPhEP handbook) are analyzed in detail. The differences in the estimates of criticality due to changes in the S(α,β) data from the reference one (ENDF/B-VII) to the CAB evaluation are 100–200 pcm; they are comparable but smaller than the ZED-2 benchmark uncertainties (≈±300 pcm). Changing the reference evaluation of 16O to the recently developed one from the CIELO project (WPEC subgroup 40) results in a decrease of criticality by ∼100 pcm. Using different combinations of the improved nuclear data for deuterium, oxygen, and the CAB TSL model, we obtain biases up to 300–400 pcm in the estimates of criticality of the selected ZED-2 benchmarks. Application of the new evaluations for 235U and 238U from the CIELO project improves the estimates of keff by decreasing the bias by ∼100 pcm that indicates a need for further investigations of the ZED-2 critical assemblies.
Fil: Roubtsov, D.. Canadian Nuclear Laboratories; Canadá
Fil: Chow, J. C.. Canadian Nuclear Laboratories; Canadá
Fil: Marquez Damian, Jose Ignacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Gerencia de Ingeniería Nuclear (CAB). División Neutrones y Reactores; Argentina
Fil: Granada, Jose Rolando. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina. Comision Nacional de Energia Atomica. Gerencia D/area de Energia Nuclear. Gerencia de Ingeniería Nuclear (cab). Div.física de Reactores Avanzados; Argentina
Materia
Evaluated Nuclear Data Libraries
Heavy Water
International Benchmarks
Nuclear Data
Thermal Neutron Scattering
Zed-2 Reactor
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/68157

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network_name_str CONICET Digital (CONICET)
spelling Application of the CAB evaluation of thermal scattering law for heavy water to ZED-2 critical benchmarks at room temperatureRoubtsov, D.Chow, J. C.Marquez Damian, Jose IgnacioGranada, Jose RolandoEvaluated Nuclear Data LibrariesHeavy WaterInternational BenchmarksNuclear DataThermal Neutron ScatteringZed-2 Reactorhttps://purl.org/becyt/ford/2.3https://purl.org/becyt/ford/2To improve the evaluations in thermal scattering sub-libraries, a set of thermal neutron scattering cross sections (scattering kernels) was developed recently at Centro Atómico Bariloche (CAB) for deuterium and oxygen bound in liquid heavy water, and made available in the ENDF-6 format. These libraries are based on a combination of results of molecular dynamics (MD) simulations and recent experimental data and, when used, result in an improvement of calculations of observables of single neutron scattering experiments, compared to results based on previous evaluations. In this work, we provide additional details on the CAB evaluation of heavy water at room temperature and discuss the important integral characteristics of neutron scattering kernels, such as the cross sections, average scattering cosine, and average secondary energy. Then, the new set of thermal scattering kernels is applied in modelling criticality of the ZED-2 reactor, and the international benchmarks LEU-MET-THERM-003 (ICSBEP handbook) and ZED2-HWR-EXP-001 (IRPhEP handbook) are analyzed in detail. The differences in the estimates of criticality due to changes in the S(α,β) data from the reference one (ENDF/B-VII) to the CAB evaluation are 100–200 pcm; they are comparable but smaller than the ZED-2 benchmark uncertainties (≈±300 pcm). Changing the reference evaluation of 16O to the recently developed one from the CIELO project (WPEC subgroup 40) results in a decrease of criticality by ∼100 pcm. Using different combinations of the improved nuclear data for deuterium, oxygen, and the CAB TSL model, we obtain biases up to 300–400 pcm in the estimates of criticality of the selected ZED-2 benchmarks. Application of the new evaluations for 235U and 238U from the CIELO project improves the estimates of keff by decreasing the bias by ∼100 pcm that indicates a need for further investigations of the ZED-2 critical assemblies.Fil: Roubtsov, D.. Canadian Nuclear Laboratories; CanadáFil: Chow, J. C.. Canadian Nuclear Laboratories; CanadáFil: Marquez Damian, Jose Ignacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Gerencia de Ingeniería Nuclear (CAB). División Neutrones y Reactores; ArgentinaFil: Granada, Jose Rolando. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina. Comision Nacional de Energia Atomica. Gerencia D/area de Energia Nuclear. Gerencia de Ingeniería Nuclear (cab). Div.física de Reactores Avanzados; ArgentinaPergamon-Elsevier Science Ltd2017-12-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/68157Roubtsov, D.; Chow, J. C.; Marquez Damian, Jose Ignacio; Granada, Jose Rolando; Application of the CAB evaluation of thermal scattering law for heavy water to ZED-2 critical benchmarks at room temperature; Pergamon-Elsevier Science Ltd; Annals of Nuclear Energy; 110; 1-12-2017; 958-9720306-4549CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0306454917302207info:eu-repo/semantics/altIdentifier/doi/10.1016/j.anucene.2017.07.034info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:39:35Zoai:ri.conicet.gov.ar:11336/68157instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 09:39:35.72CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Application of the CAB evaluation of thermal scattering law for heavy water to ZED-2 critical benchmarks at room temperature
title Application of the CAB evaluation of thermal scattering law for heavy water to ZED-2 critical benchmarks at room temperature
spellingShingle Application of the CAB evaluation of thermal scattering law for heavy water to ZED-2 critical benchmarks at room temperature
Roubtsov, D.
Evaluated Nuclear Data Libraries
Heavy Water
International Benchmarks
Nuclear Data
Thermal Neutron Scattering
Zed-2 Reactor
title_short Application of the CAB evaluation of thermal scattering law for heavy water to ZED-2 critical benchmarks at room temperature
title_full Application of the CAB evaluation of thermal scattering law for heavy water to ZED-2 critical benchmarks at room temperature
title_fullStr Application of the CAB evaluation of thermal scattering law for heavy water to ZED-2 critical benchmarks at room temperature
title_full_unstemmed Application of the CAB evaluation of thermal scattering law for heavy water to ZED-2 critical benchmarks at room temperature
title_sort Application of the CAB evaluation of thermal scattering law for heavy water to ZED-2 critical benchmarks at room temperature
dc.creator.none.fl_str_mv Roubtsov, D.
Chow, J. C.
Marquez Damian, Jose Ignacio
Granada, Jose Rolando
author Roubtsov, D.
author_facet Roubtsov, D.
Chow, J. C.
Marquez Damian, Jose Ignacio
Granada, Jose Rolando
author_role author
author2 Chow, J. C.
Marquez Damian, Jose Ignacio
Granada, Jose Rolando
author2_role author
author
author
dc.subject.none.fl_str_mv Evaluated Nuclear Data Libraries
Heavy Water
International Benchmarks
Nuclear Data
Thermal Neutron Scattering
Zed-2 Reactor
topic Evaluated Nuclear Data Libraries
Heavy Water
International Benchmarks
Nuclear Data
Thermal Neutron Scattering
Zed-2 Reactor
purl_subject.fl_str_mv https://purl.org/becyt/ford/2.3
https://purl.org/becyt/ford/2
dc.description.none.fl_txt_mv To improve the evaluations in thermal scattering sub-libraries, a set of thermal neutron scattering cross sections (scattering kernels) was developed recently at Centro Atómico Bariloche (CAB) for deuterium and oxygen bound in liquid heavy water, and made available in the ENDF-6 format. These libraries are based on a combination of results of molecular dynamics (MD) simulations and recent experimental data and, when used, result in an improvement of calculations of observables of single neutron scattering experiments, compared to results based on previous evaluations. In this work, we provide additional details on the CAB evaluation of heavy water at room temperature and discuss the important integral characteristics of neutron scattering kernels, such as the cross sections, average scattering cosine, and average secondary energy. Then, the new set of thermal scattering kernels is applied in modelling criticality of the ZED-2 reactor, and the international benchmarks LEU-MET-THERM-003 (ICSBEP handbook) and ZED2-HWR-EXP-001 (IRPhEP handbook) are analyzed in detail. The differences in the estimates of criticality due to changes in the S(α,β) data from the reference one (ENDF/B-VII) to the CAB evaluation are 100–200 pcm; they are comparable but smaller than the ZED-2 benchmark uncertainties (≈±300 pcm). Changing the reference evaluation of 16O to the recently developed one from the CIELO project (WPEC subgroup 40) results in a decrease of criticality by ∼100 pcm. Using different combinations of the improved nuclear data for deuterium, oxygen, and the CAB TSL model, we obtain biases up to 300–400 pcm in the estimates of criticality of the selected ZED-2 benchmarks. Application of the new evaluations for 235U and 238U from the CIELO project improves the estimates of keff by decreasing the bias by ∼100 pcm that indicates a need for further investigations of the ZED-2 critical assemblies.
Fil: Roubtsov, D.. Canadian Nuclear Laboratories; Canadá
Fil: Chow, J. C.. Canadian Nuclear Laboratories; Canadá
Fil: Marquez Damian, Jose Ignacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Gerencia de Ingeniería Nuclear (CAB). División Neutrones y Reactores; Argentina
Fil: Granada, Jose Rolando. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina. Comision Nacional de Energia Atomica. Gerencia D/area de Energia Nuclear. Gerencia de Ingeniería Nuclear (cab). Div.física de Reactores Avanzados; Argentina
description To improve the evaluations in thermal scattering sub-libraries, a set of thermal neutron scattering cross sections (scattering kernels) was developed recently at Centro Atómico Bariloche (CAB) for deuterium and oxygen bound in liquid heavy water, and made available in the ENDF-6 format. These libraries are based on a combination of results of molecular dynamics (MD) simulations and recent experimental data and, when used, result in an improvement of calculations of observables of single neutron scattering experiments, compared to results based on previous evaluations. In this work, we provide additional details on the CAB evaluation of heavy water at room temperature and discuss the important integral characteristics of neutron scattering kernels, such as the cross sections, average scattering cosine, and average secondary energy. Then, the new set of thermal scattering kernels is applied in modelling criticality of the ZED-2 reactor, and the international benchmarks LEU-MET-THERM-003 (ICSBEP handbook) and ZED2-HWR-EXP-001 (IRPhEP handbook) are analyzed in detail. The differences in the estimates of criticality due to changes in the S(α,β) data from the reference one (ENDF/B-VII) to the CAB evaluation are 100–200 pcm; they are comparable but smaller than the ZED-2 benchmark uncertainties (≈±300 pcm). Changing the reference evaluation of 16O to the recently developed one from the CIELO project (WPEC subgroup 40) results in a decrease of criticality by ∼100 pcm. Using different combinations of the improved nuclear data for deuterium, oxygen, and the CAB TSL model, we obtain biases up to 300–400 pcm in the estimates of criticality of the selected ZED-2 benchmarks. Application of the new evaluations for 235U and 238U from the CIELO project improves the estimates of keff by decreasing the bias by ∼100 pcm that indicates a need for further investigations of the ZED-2 critical assemblies.
publishDate 2017
dc.date.none.fl_str_mv 2017-12-01
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/68157
Roubtsov, D.; Chow, J. C.; Marquez Damian, Jose Ignacio; Granada, Jose Rolando; Application of the CAB evaluation of thermal scattering law for heavy water to ZED-2 critical benchmarks at room temperature; Pergamon-Elsevier Science Ltd; Annals of Nuclear Energy; 110; 1-12-2017; 958-972
0306-4549
CONICET Digital
CONICET
url http://hdl.handle.net/11336/68157
identifier_str_mv Roubtsov, D.; Chow, J. C.; Marquez Damian, Jose Ignacio; Granada, Jose Rolando; Application of the CAB evaluation of thermal scattering law for heavy water to ZED-2 critical benchmarks at room temperature; Pergamon-Elsevier Science Ltd; Annals of Nuclear Energy; 110; 1-12-2017; 958-972
0306-4549
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0306454917302207
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.anucene.2017.07.034
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Pergamon-Elsevier Science Ltd
publisher.none.fl_str_mv Pergamon-Elsevier Science Ltd
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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