[en] Automatic translation: The nuclear research facility Jülich GmbH, Jülich (KFA) has considered convert the AVR nuclear reactor into a process heating system. In this context, Bergbau-Forschung GmbH, Essen (BF) and Mannesmann Anlagenbau AG, Düsseldorf (MAB) commissioned with a preliminary investigation into the use of steam / coal gasification (WKV). In addition to the integration into the primary helium circuit of the AVR, a connection to the EVA II system and two large-scale Versions (125 and 170 MW) are considered. The technical concept on which this investigation is based envisages integrating the carburetor into the confinement of the AVR. The gasification therefore takes place in an upright gas generator with two reaction zones arranged one above the other. The concept differs from that previously developed by BF additionally by the fact that improvements through thermal optimization have been taken into account. While the optimization measures generally include the Favorably influencing full and partial gasification in the horizontal as well as in the upright gas generator, the vertical design leads to further advantages in the case of partial gasification. The results of the thermal optimization can be summarized as follows become: - The introduction of the countercurrent principle results in a significantly better use of heat. This principle is realized by adding the heat transfer medium Helium with the high flow temperature initially via a heat exchanger of the Gasification zone and then above with a correspondingly lowered temperature a further heat exchanger is fed to the pyrolysis zone which is at a lower temperature level. The exit temperature of the helium from the pyrolysis zone can thus be significantly reduced compared to the previous design and can be expressed for all considered inlet temperatures by geometric Adjustment of the reaction volumes and heat exchanger surfaces between 700 and Set 750 ° C. The disadvantage of the higher pressure loss of the helium the series connection of the heat exchangers is almost eliminated by the geometrical adaptation of the heat exchanger surfaces.