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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10.1016/j.nucengdes.2017.07.023
Inclou dades d'ús des de 2022
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hdl:2117/107743
Tipus de documentArticle
Data publicació2017-10
Condicions d'accésAccés obert
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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.
CitacióArias, 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.
ISSN0029-5493
Versió de l'editorhttp://www.sciencedirect.com/science/article/pii/S0029549317303552
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