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Communication Dans Un Congrès Année : 2000

Qualification of the numerical simulation of a Hypothetical Core Disruptive Accident on the MARA 10 test-facility

Marie-France Robbe
Yves Cariou
  • Fonction : Auteur
Eloi Treille
  • Fonction : Auteur

Résumé

In case of a Hypothetical Core Disruptive Accident (HCDA) in a Liquid Metal Reactor, the interaction between fuel and liquid sodium creates a high pressure gas bubble in the core. The violent expansion of this bubble loads the vessel and the internal structures, whose deformation is important. The experimental test MARA10 simulates a HCDA in a mock-up schematizing simply the reactor block of a Fast Breeder Reactor (external vessel and roof as well as the main internal structures of the reactor). The vessel is filled with water, topped with an air blanket. The test is fired using an explosive charge. This paper presents a simulation of the MARA10 test with the fast dynamics code CASTEM-PLEXUS. A specific HCDA constitutive law was implemented in this code to simulate this kind of explosion. The external structures are represented by shells. Coupled fluid-structure computations are carried out. The bubble gas expands in the central zone confined by the internal structures and afterwards it escapes in the rest of the mock-up by the narrow space between the ACS and the shield. Water vaporises out of the radial shield, below the diagrid and in the ACS. The air layer is compressed under the roof by the water pushed upwards by the explosion. Very soon, the diagrid moves down, the radial shield goes away and the ACS base goes up. Then the vessel base moves down and the lateral wall goes away, thus creating a lower bulge. The ACS lateral wall buckles, the ACS top goes up, thus pulling up the rest of the roof. Finally, an upper bulge creates in the upper part of the vessel lateral wall and the ACS base changes curvature. After a brief presentation of the MARA 10 test-facility, this paper is focused on the numerical model, the analysis of the results computed by the code CASTEM-PLEXUS and a comparison with the experimental results and previous numerical results computed by SIRIUS and CASTEM-PLEXUS.
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Dates et versions

cea-04177269 , version 1 (04-08-2023)

Identifiants

  • HAL Id : cea-04177269 , version 1

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Marie-France Robbe, Yves Cariou, Eloi Treille, Michel Lepareux. Qualification of the numerical simulation of a Hypothetical Core Disruptive Accident on the MARA 10 test-facility. Nha Trang 2000 International Colloquium, Aug 2000, Nha Trang, Vietnam. pp 746-755. ⟨cea-04177269⟩

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