Duct in a prestressed pressure vessel of a gas-cooled nuclear reactor

The invention concerns ducts in prestressed concrete vessel walls in consideration of the lay-out and safety conditions of the vessel as well as of the conditions for a fast assembling and disassembling of component parts, especially cooling gas blowers. The component parts from a flow limitation and thus the first closing. Apart from special supports of the cooling gas blower the invention has safety devices against expulsion of the cooling gas blower and devices for leading through the supply media without them touching the outer cover plate of the duct. This means that the cover plate can be disassembled without interrupting the supply lines. (orig.)