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The first part of this paper concerns the presentation of CEDRIC. CEDRIC (Code d'Etudes Dynamique de Réseaux Inter Connectés) is a one dimensional thermalhydraulic software which is capable of modelling single and two phase flow for steady state and transient conditions. It has been developed by CEA/TECHNICATOME (French national nuclear agency) for nuclear cooling system design and failure analysis. It is a “3+1” equations software (mass, momentum, energy for the fluid and energy for the walls linked to fluid). These equations are solved using a finite difference method with a fully implicit resolution, which allows the use of large time steps in comparison to the ones imposed by the Courant limit. In order to fulfil the requirements of spaceborne fluid loop analysis, CNES required some adaptations such as new fluids and new elements (radiators for example).