Cold gas flow guide in a steam raising unit for a high temperature reactor

For the simpler configuration of the cold gas incoming flow guide for the annular space to the circulating blowers between the pressure vessel jacket and the steam-raising unit jacket, it is proposed that the cold gas should flow into a riser pipe through cold gas ducts penetrating the compensation pipe bundle situated at the top end of the steam-raising unit jacket and is taken to the blower from there. The riser pipe is situated in the part of the hot gas deflection device running along the pressure vessel axis. (orig./HP)