Multiscale effects in sodium fast reactors : feedback from the open phase of the FFTF LOFWOS-13 test - CEA - Commissariat à l’énergie atomique et aux énergies alternatives Accéder directement au contenu
Communication Dans Un Congrès Année : 2023

Multiscale effects in sodium fast reactors : feedback from the open phase of the FFTF LOFWOS-13 test

Résumé

Sodium and lead-cooled liquid-metal reactors often feature large liquid-metal pools, where complex 3D phenomena may take place during loss-of-flow or loss-of-heatsink transients. This concern has given rise to the development of new modelling approaches aimed at integrating the result of sucbhannel and/or CFD model into an overall reactor calculation: these "multi-scale" simulations have been applied, among others, to the PHENIX natural convection and dissymmetric tests and to the EBR-II loss-of flow tests, as well as to several liquid-metal experiments. In the context of a recently-concluded IAEA CRP, the FFTF "LOFWOS-13" unprotected loss-of-flow test has been analyzed at CEA with the MATHYS multi-scale coupling code: on the basis of simulations performed at imposed power, this paper details the influence of 3D phenomena in the primary vessel on the overall transient. Because of the loop-type design of the reactor, these phenomena have little to no influence on the primary flowrate and inlet/outlet temperatures : however, in-vessel measurements, and in particular subassembly outlet temperatures, are strongly affected by the 3D behavior of the temperature field at the core outlet and its propagation above the core. Consequently, the multiscale simulation is not indispensable to the system-scale analysis of the overall transient: however, it can play an important role as a "numerical twin" to the experimental data, helping to understand how local measurements may differ from the averages predicted by a system-scale approach. The possible effect of 3D phenomena outside the vessel, such as stratification in the piping, will be analyzed in future work.
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Dates et versions

cea-04439317 , version 1 (05-02-2024)

Identifiants

Citer

Antoine Gerschenfeld, Yannick Gorsse, Simon Li. Multiscale effects in sodium fast reactors : feedback from the open phase of the FFTF LOFWOS-13 test. NURETH-20 - 20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, Aug 2023, Washington DC, United States. pp.3014-3027, ⟨10.13182/NURETH20-40892⟩. ⟨cea-04439317⟩
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