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The GRS (Gesellschaft fuer Anlagen und Reaktorsicherheit = Company for Plant and Reactor Safety) maintains and further develops the code system DORT-TD/HERMIX-DIREKT, which is a complex tool for the simulation of coupled neutronics/thermal-hydraulics transients and accident scenarios of high-temperature gas cooled reactors of pebble bed type. With this tool, GRS takes part in the international benchmark activity "OECD/NEA PBMR400 Transient Benchmark”, which aims at the simulation of transients for the South African PBMR400 reactor type. It is the goal of the work to finalize the benchmark activity, to perform sensitivity studies on several uncertain model parameters, and to implement some new code features like a heat conduction model for fast reactivity initiated transients (one-dimensional model). Moreover, it is desirable to implement new code modules for the 3D visualization of benchmark results, e,g. by means of the graphics tools FIELDVIEW or MICRO-AVS.
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