In this paper, we presented a computation of the MARAs lest simulating a Hypothetical Core Disruptive Accident. The test consists inside an explosion in a sleet vessel covered with a flexible roof. An explosive charge is placed in the middle of the test-facility. The vessel is filled with water, topped by an air layer below rite roof. A specific HCDA constitutive law was developed in rite FUROPLEXUS' code to simulate this kind of explosion. The code computed successfully the explosion during 20 ms of physical time. The simulation shows the propagation of a pressure wave from the explosive zone towards the external vessel. A large gaseous zone creates in the middle of the mock-up. The pressure wave impacts first the vessel base and then the lateral wall. It large lower bulge forms in the lower part of the vessel lateral wall. Afterwards, water is pushed hack by the vessel, goes upwards and impacts the roof. The roof suffers a high pressure peak and is lifted. The air layer is expelled in the top corner by the upward directed water. A second bulge appears in the upper part of lateral wall. A comparison was realised between the experimental results, rite results issued from two ELIROPLEXUS simulations and previous ones computed by the CASTEM-PLEXUS code and by the SIRIUS code. Globally the results of the three simulations are in a good agreement with the test results.
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