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  Institute for Reactor Safety and Reactor Technology (Univ.-Prof. Dr. rer. nat. Hans-Josef Allelein)

Reactor physics

Reactor physics is being dealt with primarily at the IEF-6. The department of reactor theory develops and utilizes computer codes in order to simulate high-temperature (HTR) and light water reactors (LWR). This includes questions concerning the design and day-to-day operation of reactors as well as design basis accidents and events beyond the design basis.

Especially the coupling mechanisms between neutronics, thermohydraulics, graphite corrosion and dust transport are current areas of research, which the institute investigates into with national and international participation. Answering these questions involved in the past the elaboration of several codes, such as VSOP, TINTE, MGT, FRESCO, PANAMA, which were also used in recent authorization procedures in South Africa (PBMR) and China (HTR-PM). In the near future they are meant to be unified to one "HTR-Code-Package".

A further field of activity within reactor theory is the simulation of the neutronics in subcritical accelerator driven systems (ADS) and fusion reactors. In order to describe such complex geometries of neutron transport, the Monte Carlo Program MCNP is being used. Couplings with depletion codes such as ORIGEN and FISPACT exist, which allow taking into account changes in the nuclide inventory in the calculations.

cooling-gas temperature of a HTR
Simulation of cooling-gas temperature of a HTR during a design basis accident (TWCR).

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