Nusselt correlation development in unsteady laminar gas flows for CABRI multiphysic simulations with CATHARE2 - Inria - Institut national de recherche en sciences et technologies du numérique Accéder directement au contenu
Article Dans Une Revue Nuclear Engineering and Design Année : 2021

Nusselt correlation development in unsteady laminar gas flows for CABRI multiphysic simulations with CATHARE2

Résumé

CABRI is an experimental pulse reactor, funded by the french Institute for Radiological protection and Nuclear Safety (IRSN) and operated by CEA at the Cadarache nuclear center, France. Its aim is to study and thus to better understand RIA (Reactivity Initiated Accident) effects on nuclear fuels. The restart of the CABRI reactor in 2015 offers the opportunity to validate tools involving multiphysic calculation schemes on reactivity insertions (RI) transients at a system scale. Physics of the in-pile CABRI tests is complex and implies various physical fields (solid and fluid thermics, thermal-hydraulics, mechanics and neutronics) and their coupled effects. The reactivity insertion in CABRI is mastered by the depressurization of a neutron absorber (3 He), contained into transient rods. These rods are located inside the core and connected to low and high flow rate channels towards a dump tank. This enables the realization of various types of transients. As this depressurization highly influences the reactivity insertion kinetics, it is essential to accurately simulate the 3 He density evolution which depends on the heat exchanges inside the circuit. The challenge is thus to manage the simulation of the various CABRI complex transients catching the transient heat exchanges in the transients rods. In order to achieve this objective, a correlation for the Nusselt evolution in an unsteady compressible laminar 3 He flow, inside a closed tube, has been realized from numerical resolution of an analytical model and implemented in the scientific calculation tool CATHARE2. This paper describes this analytical model and its numerical resolution. After having been validated on results of the literature in steady flow inside open tube, the correlation established for the evolution of the Nusselt in a transient rods' tube is given. Finally, Best-Estimate simulation results of CATHARE2 are compared with experimental data obtained on CABRI commission tests: core power and 3 He pressure evolution.
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Dates et versions

hal-03749646 , version 1 (11-08-2022)

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J-M Labit, N Marie, O Clamens, E Merle. Nusselt correlation development in unsteady laminar gas flows for CABRI multiphysic simulations with CATHARE2. Nuclear Engineering and Design, 2021, 373, pp.111032. ⟨10.1016/j.nucengdes.2020.111032⟩. ⟨hal-03749646⟩
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