Validation of the Core Disruptive Accident constitutive law of the Castem-Plexus code on the Mara8 test
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 MARA8 is a very simple small scale representation of a reactor. It simulates a HCDA in a mock-up closed by a flexible vessel and a flexible roof. The vessel is filled with water, topped with an air blanket. The test is fired using an explosive charge.
A specific HCDA constitutive law was implemented in the fast dynamics CASTEM-PLEXUS code to describe this kind of explosion. The numerical modeling used to represent the accident consists in the specific CDA constitutive law for the fluids. The external structures are represented by shells. Coupled fluid-structure computations are carried out.
This paper describes the MARA8 test-facility, the numerical simulation and
its main results and a comparison of the results computed by CASTEM-PLEXUS with the experimental results as well as other numerical results issued from previous simulations with the codes SIRIUS and CASTEM-PLEXUS.
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