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- W2767092583 abstract "Abstract 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. 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 at 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 poison 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 heavy liquid metal fast reactors." @default.
- W2767092583 created "2017-11-10" @default.
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- W2767092583 date "2018-02-01" @default.
- W2767092583 modified "2023-09-23" @default.
- W2767092583 title "A negative reactivity feedback driven by induced buoyancy after a temperature transient in lead-cooled fast reactors" @default.
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- W2767092583 doi "https://doi.org/10.1016/j.net.2017.10.001" @default.
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