A negative reactivity feedback driven by induced buoyancy after a temperature transient in lead-cooled fast reactors

Consideration is given to the possibility to use changes in buoyancy as a negative reactivity feedback mechanism during temperature transients in heavy liquid metal fast reactors (HLMFRs). It is shown that by the proper use of heavy pellets in the fuel elements, fuel rods could be endowed with a pas...

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Autor: Arias Montenegro, Francisco Javier|||0000-0002-0779-9754
Tipo de recurso: artículo
Fecha de publicación:2017
País:España
Institución:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/109164
Acceso en línea:https://hdl.handle.net/2117/109164
https://dx.doi.org/10.1016/j.net.2017.10.001
Access Level:acceso abierto
Palabra clave:Fluid dynamics
Nuclear reactors
Heavy liquid metal fast reactors
Buoyancy
Generation IV reactors
Dinàmica de fluids
Reactors nuclears
Àrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids
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spelling A negative reactivity feedback driven by induced buoyancy after a temperature transient in lead-cooled fast reactorsArias Montenegro, Francisco Javier|||0000-0002-0779-9754Fluid dynamicsNuclear reactorsHeavy liquid metal fast reactorsBuoyancyGeneration IV reactorsDinàmica de fluidsReactors nuclearsÀrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluidsConsideration is given to the possibility to use changes in buoyancy as a negative reactivity feedback mechanism during temperature transients in heavy liquid metal fast reactors (HLMFRs). It is shown that by the proper use of heavy pellets in the fuel elements, fuel rods could be endowed with a passive self-ejection mechanism and then with a negative feedback. A first estimate of the feasibility of the mechanism is calculated by using a simplified geometry and model. If in addition, a neutron poison pellet is introduced in the bottom of the fuel, then when the fuel element is displaced upward by buoyancy force, the reactivity will be reduced not only by disassembly of the core but also by introducing the neutron poisson from the bottom. The use of induced buoyancy opens up the possibility of introducing greater amounts of actinides into the core, as well as providing a palliative solution to the problem of positive coolant temperature reactivity coefficients that could be featured by the HLMFRs.Peer Reviewed20172017-10-2420172017-10-25journal articlehttp://purl.org/coar/resource_type/c_6501AMhttp://purl.org/coar/version/c_ab4af688f83e57aainfo:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/109164https://dx.doi.org/10.1016/j.net.2017.10.001reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution-NonCommercial-NoDerivs 3.0 Spainhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/1091642026-05-27T15:37:01Z
dc.title.none.fl_str_mv A negative reactivity feedback driven by induced buoyancy after a temperature transient in lead-cooled fast reactors
title A negative reactivity feedback driven by induced buoyancy after a temperature transient in lead-cooled fast reactors
spellingShingle A negative reactivity feedback driven by induced buoyancy after a temperature transient in lead-cooled fast reactors
Arias Montenegro, Francisco Javier|||0000-0002-0779-9754
Fluid dynamics
Nuclear reactors
Heavy liquid metal fast reactors
Buoyancy
Generation IV reactors
Dinàmica de fluids
Reactors nuclears
Àrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids
title_short A negative reactivity feedback driven by induced buoyancy after a temperature transient in lead-cooled fast reactors
title_full A negative reactivity feedback driven by induced buoyancy after a temperature transient in lead-cooled fast reactors
title_fullStr A negative reactivity feedback driven by induced buoyancy after a temperature transient in lead-cooled fast reactors
title_full_unstemmed A negative reactivity feedback driven by induced buoyancy after a temperature transient in lead-cooled fast reactors
title_sort A negative reactivity feedback driven by induced buoyancy after a temperature transient in lead-cooled fast reactors
dc.creator.none.fl_str_mv Arias Montenegro, Francisco Javier|||0000-0002-0779-9754
author Arias Montenegro, Francisco Javier|||0000-0002-0779-9754
author_facet Arias Montenegro, Francisco Javier|||0000-0002-0779-9754
author_role author
dc.subject.none.fl_str_mv Fluid dynamics
Nuclear reactors
Heavy liquid metal fast reactors
Buoyancy
Generation IV reactors
Dinàmica de fluids
Reactors nuclears
Àrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids
topic Fluid dynamics
Nuclear reactors
Heavy liquid metal fast reactors
Buoyancy
Generation IV reactors
Dinàmica de fluids
Reactors nuclears
Àrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids
description Consideration is given to the possibility to use changes in buoyancy as a negative reactivity feedback mechanism during temperature transients in heavy liquid metal fast reactors (HLMFRs). It is shown that by the proper use of heavy pellets in the fuel elements, fuel rods could be endowed with a passive self-ejection mechanism and then with a negative feedback. A first estimate of the feasibility of the mechanism is calculated by using a simplified geometry and model. If in addition, a neutron poison pellet is introduced in the bottom of the fuel, then when the fuel element is displaced upward by buoyancy force, the reactivity will be reduced not only by disassembly of the core but also by introducing the neutron poisson from the bottom. The use of induced buoyancy opens up the possibility of introducing greater amounts of actinides into the core, as well as providing a palliative solution to the problem of positive coolant temperature reactivity coefficients that could be featured by the HLMFRs.
publishDate 2017
dc.date.none.fl_str_mv 2017
2017-10-24
2017
2017-10-25
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
AM
http://purl.org/coar/version/c_ab4af688f83e57aa
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/109164
https://dx.doi.org/10.1016/j.net.2017.10.001
url https://hdl.handle.net/2117/109164
https://dx.doi.org/10.1016/j.net.2017.10.001
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:UPCommons. Portal del coneixement obert de la UPC
instname:Universitat Politècnica de Catalunya (UPC)
instname_str Universitat Politècnica de Catalunya (UPC)
reponame_str UPCommons. Portal del coneixement obert de la UPC
collection UPCommons. Portal del coneixement obert de la UPC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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