On the use of a dedicated ballast pellet for a prompt self-ejection mechanism after a temperature transient in lead-cooled fast reactors

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To access the full text documents, please follow this link: http://hdl.handle.net/2117/107743

dc.contributor	Universitat Politècnica de Catalunya. Departament de Mecànica de Fluids
dc.contributor.author	Arias Montenegro, Francisco Javier
dc.date	2017-10
dc.identifier.citation	Arias, F.J. On the use of a dedicated ballast pellet for a prompt self-ejection mechanism after a temperature transient in lead-cooled fast reactors. "Nuclear engineering and design", Octubre 2017, vol. 322, p. 485-491.
dc.identifier.citation	0029-5493
dc.identifier.citation	10.1016/j.nucengdes.2017.07.023
dc.identifier.uri	http://hdl.handle.net/2117/107743
dc.language.iso	eng
dc.relation	http://www.sciencedirect.com/science/article/pii/S0029549317303552
dc.rights	Attribution-NonCommercial-NoDerivs 3.0 Spain
dc.rights	info:eu-repo/semantics/openAccess
dc.rights	http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subject	Àrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids
dc.subject	Àrees temàtiques de la UPC::Energies::Energia nuclear
dc.subject	Fluid dynamics
dc.subject	Nuclear reactors
dc.subject	Heavy liquid metal fast reactors
dc.subject	Buoyancy
dc.subject	Temperature transient compensation
dc.subject	Generation IV reactors
dc.subject	Dinàmica de fluids
dc.subject	Reactors nuclears
dc.title	On the use of a dedicated ballast pellet for a prompt self-ejection mechanism after a temperature transient in lead-cooled fast reactors
dc.type	info:eu-repo/semantics/submittedVersion
dc.type	info:eu-repo/semantics/article
dc.description.abstract	The potential use of changes in buoyancy as a reactivity feedback mechanism during temperature transients in heavy liquid metal fast reactors (HLMFRs) is discussed. It is shown that with the use of ballast pellets (~15% volume fraction) introduced in combination with fuel pellets, fuel rods will be endowed with a reliable self-ejection mechanism that is able to compensate temperature transients. Utilizing a simplified model, an estimate of the negative reactivity insertion expected from this mechanism is derived. The use of ballast pellets opens up the possibility of introducing greater amounts of actinides into the core, as well as providing a solution to the classical problem of positive coolant temperature reactivity coefficients in fast reactors.
dc.description.abstract	Peer Reviewed

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