Abstract: Disclosed is a high temperature power plant construction, preferably a nuclear power plant, including a plurality of plant components comprising at least one gas-cooled high temperature source, contained in a sealed vessel, and a transport system, connecting the plant components, for gas of high temperature and high pressure, the improvement which comprises the gas transport system comprising at least one internally insulated hot gas transport conduit formed from a plurality of separate sections, a pressure jacket surrounding said hot gas transport conduit, at least one closed channel formed inside of the vessel for transporting a cool gas stream, and means for freely and removably mounting the hot gas transport conduit coaxially inside of the cool gas transport channel.

Abstract: In a nuclear power plant, a gas cooled nuclear reactor is located within a prestressed concrete pressure tank which is enclosed within a safety tank. The main components of the plant are positioned within the pressure tank and include a gas turboset arranged in a horizontally extending tunnel spaced below the nuclear reactor. The main components of the plant include heat exchange equipment which is positioned in vertically extending shafts disposed in an annular arrangement within the pressure tank about the nuclear reactor. The gas coolant flows in a closed cycle through the plant from the nuclear reactor to the turbine in the turboset and then into the heat exchange equipment which includes recuperators, precoolers and intermediate coolers disposed in symmetrically arranged groups located in the vertically extending shafts.

Abstract: Joints for high temperature and high pressure conduits are disclosed wherein two conduit members are joined in such a manner that permits axial and radial movement due to temperature variations therein while at the same time provides sealing of the joints by means of segmented sealing rings disposed in grooves and extending into a space defined by a sleeve-like extension on one conduit member and a bushing like extension on a second conduit member.

Abstract: A heat exchanger assembly of the counterflow type having a vertically extending longitudinal configuration is constructed from a plurality of individual tube nests, with each of the nests formed of a plurality of individual tubes adapted to have a first heat exchange medium flow therethrough. The upper and lower ends of the tubes are connected to tube plates and a guide shell is provided surrounding each of the tube nests for effecting therein flow of a secondary heat exchange medium around the individual tubes of each nest. Each of the tube nests is formed by its associated guide shell and tube plates as an individual box with the boxes thus formed when viewed in a plane extending transversely to the longitudinal direction of the heat exchanger assembly being arranged as a hexagonal grid.

Abstract: A cylindrically shaped prestressed concrete tank for a gas-cooled high temperature nuclear reactor plant includes a centrally located chamber for the reactor with a number of horizontally extending compartments located below the reactor chamber and at least two different groups of vertically extending compartments located radially outwardly from reactor chamber. The tank is prestressed by vertically extending tensioning elements and two different groups of horizontally extending tensioning elements. One group of horizontally extending tensioning elements extend chordally alongside and for the vertical range of the horizontal compartments and are anchored on the outer surfaces of the tank. The other group of horizontal tensioning elements are ring-shaped and extend in channels around the outer surface of the tank. This other group is located above and below the vertical range of the horizontal compartments.