[en] The prototype nuclear process heat plant PNP-1000 is designed for two coal gasification processes: Steam gasification of hard coal and hydro gasification of lignite. In both plants the primary system is identical, i.e. that part of the plant containing the reactor and the components presented in this context. A schematic flow diagram of the PNP-plant for steam gasification of hard coal is presented. The primary system with the reactor, the heat exchangers and the circulator is shown on the left side. In the heat exchangers the heat is transferred to an intermediate circuit, which is coupled to a gas-factory located outside the reactor building. At the outlet of the gas-factory SNG (substitute natural gas - CH₄ ) is supplied for consumption. The steam required for the gasification process is extracted from the high-pressure section of the turbine. A steam generator is installed in the intermediate circuit supplying the steam required for generating the plant electricity