As soon as the decision of the final shutdown of SUPERPHENIX was taken, studies linked to the final shutdown and the decommissioning of this reactor were taken into considerations. Amongst all this studies, one concerns the final treatment of the remaining sodium of the primary vessel of the reactor (estimated to a maximum of six tons after a fully draining of the sodium).

The process envisaged is an in situ treatment called the carbonatation process.

This papers describes the principle of this process and presents CEA experimentations done to precise the kinetic of this process as a function of different parameters (temperature, percentage of carbon dioxide, percentage of water, etc).

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