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Scale effects methodology applied to uprising jets in astrid


The CEA is involved in the development of the 4 th generation of nuclear reactors, among which are the Sodium Cooled Fast Reactors (SFR). To support their design and safety, specific codes were developed and should be validated using experimental results from relevant mock-ups. Due to the complexity of building a full-sized prototype in the nuclear field, most of the experiments are performed on reduced-sized models but it may lead to scale effects. Such scale effect is under study in this paper, focusing on a critical issue in SFR reactor, which is the rising of the jet outgoing the core at low power. On this issue, a scale effects methodology is detailed, using the SFR's reduced scale mock-up MICAS as the reference scale. To achieve that, dimensionless Navier-Stokes equations under Boussinesq's approximation are considered and the Vaschy-Buckingham theorem is applied to determine the most relevant dimensionless numbers: the densimetric Froude number. Experimental campaigns have been performed to measure velocity fields. Their analysis clearly shown dependency of mean pathway of the jet on this dimensionless number. Particularly, plotting the jet angle as a function of the normalized densimetric Froude number, a change of behaviour for a threshold value of 0.45 has been observed. This result also shows negligible effects on the jet rise of the phenomena happening before jet impingement on the Upper Core Structure (UCS).
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hal-03727184 , version 1 (19-07-2022)


  • HAL Id : hal-03727184 , version 1


B Jourdy, D Guenadou, N Seiler, Alexandre Labergue, Michel Gradeck. Scale effects methodology applied to uprising jets in astrid. 19th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-19), Mar 2022, Bruxelles, Belgium. ⟨hal-03727184⟩
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