The Transient 3-D Transport Coupled Code TORT-TD/ATTICA3D for High-Fidelity Pebble-Bed HTGR Analyses

Abstract

This article describes the 3D discrete ordinates–based coupled code system TORT-TD/ATTICA3D that aims at steady state and transient analyses of pebble-bed high-temperature gas cooled reactors. In view of increasing computing power, the application of time-dependent neutron transport methods becomes feasible for best estimate evaluations of safety margins. The calculation capabilities of TORT-TD/ATTICA3D are presented along with the coupling approach, with focus on the time-dependent neutron transport features of TORT-TD. Results obtained for the OECD/NEA/NSC PBMR-400 benchmark demonstrate the transient capabilities of TORT-TD/ATTICA3D.

Keywords:

• HTGR
• time dependent
• discrete ordinates
• porous medium
• coupled code

ACKNOWLEDGMENTS

This work was supported by the German Federal Ministry of Economics and Technology due to a resolution of the German Bundestag. Additional support was provided by EnBW Kernkraft GmbH.