Progress on the development of a fully integrated HTR code package

A variety of computer codes have been developed, validated and optimized to simulate the different safety and operational aspects of HTRs. In order to overcome the present limitations of these codes and to exploit the advantages of modern computer clusters, a project has been initiated to integrate these individual programs into a consistent code package applying state-of-the-art programming techniques and standards. The HTR code package couples the related and recently applied physics models in a highly integrated manner. This will allow the steady-state and transient operating conditions of a full 3D reactor model to be simulated including new features such as fission product release calculations for each core zone or dust production and transport simulations. In this paper we report on the basic software architecture and the current status of this new integrated code system currently under development.