The Institute for Nuclear Waste Management and Reactor Safety (IEK-6) at the Forschungszentrum Juelich (JUELICH) investigates accident scenarios of gas-cooled High-Temperature Reactors (HTR), especially the air ingress scenario. Fluid mechanic codes and models are developed and validated using in-house experimental databases.

This paper describes the development of a computational fluid dynamics (CFD) model with the porous media approach in order to investigate the air ingress scenario: “rupture of the pressure compensation line” at the HTR-Modul.

Bases on a brief introduction on this chosen air ingress scenario, the used model equations are explained, as well as the necessary simplifications of the physical model. Afterwards, an overview of the used experiments for validation purposes is given. As an outlook, the assumptions and boundary conditions of the chosen scenario are shown and the setup for the air ingress calculation is presented.

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