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

Name: On the use of a dedicated ballast pellet for a prompt self-ejection mechanism after a temperature transient in lead-cooled fast reactors
Creator: Arias Montenegro, Francisco Javier
Keywords: Àrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids, :Energies::Energia nuclear [Àrees temàtiques de la UPC], 020209 energy, 0211 other engineering and technologies, Àrees temàtiques de la UPC::Energies::Energia nuclear, 02 engineering and technology, 7. Clean energy, 02020910 Climate change policy/Ethanol fuel, Buoyancy, Nuclear reactors

descriptionPublicationkeyboard_double_arrow_right Article , Journal 01 Oct 2017Embargo end date: 31 Oct 2019 Spain Publisher:Elsevier BVJournal:Nuclear Engineering and Design, volume 322, pages 485-491 (issn: 0029-5493,

Authors: Arias Montenegro, Francisco Javier;

doi: 10.1016/j.nucengdes.2017.07.023

handle: 2117/107743

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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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. Peer Reviewed

Country

Spain

Related Organizations

Universitat Politècnica de Catalunya
Spain
Universitat Polite`cnica de Catalunya
Spain
Open University of Catalonia
Spain

Keywords

Àrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids, :Energies::Energia nuclear [Àrees temàtiques de la UPC], Àrees temàtiques de la UPC::Energies::Energia nuclear, Buoyancy, Nuclear reactors, Reactors nuclears, Fluid dynamics, Temperature transient compensation, Dinàmica de fluids, Heavy liquid metal fast reactors, Generation IV reactors, :Enginyeria mecànica::Mecànica de fluids [Àrees temàtiques de la UPC]

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