Computation of the MARS test simulating a Hypothetical Core Disruptive Accident in a small scale replica of a Fast Breeder Reactor
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 MARS simulates a HCDA in a small scale mock-up containing all the significant internal components of a Fast Breeder Reactor. The test-facility is filled with water topped by an argon blanket and the explosion is generated by an explosive charge.
his paper presents a numerical simulation of the test with the CASTEM-PLEXUS code. The top closure is represented by massive structures. The main internal structures are described by shells while the peripheral massive structures are taken into account with a pressure loss because their geometry is too complicated to mesh them.
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