Abstract: A steam generator includes a vertically elongated housing. A horizontal tube plate and a U-shaped tube bundle are disposed in the housing. The tube bundle has mutually spaced apart legs defining an intermediate space therebetween and tube ends disposed in the tube plate. The tube plate has a horizontal blow-down line formed therein. The tube plate has holes formed therein leading from the blow-down line into the intermediate space.

Abstract: A steam generator includes a vertically elongated housing. A horizontal tube plate and a U-shaped tube bundle are disposed in the housing. The tube bundle has mutually spaced apart legs defining an intermediate space therebetween and tube ends disposed in the tube plate. The tube plate has a horizontal blow-down line formed therein over the width of the tube bundle. The tube plate has vertical bores formed therein leading from the blow-down line into the intermediate space.

Abstract: A pressure vessel assembly includes a pressure vessel with a vessel wall having a connection stub with a stub wall. A thermal protector for the connection stub in the form of a first tube extends substantially parallel to the stub wall. The first tube has an inner surface, one end disposed at the stub wall and another free end extending into the pressure vessel. Brackets are disposed on the inner surface of the tube between the other free end and the stub wall. A second tube extends into the connection stub beyond the one end of the first tube. The second tube has slits formed therein defining prongs therebetween connected to the brackets.

Abstract: Arrangement for the prevention of crack formations at the inside surfaces of feedwater line nozzles (13) which open into pressure vessels, especially nuclear reactor pressure vessels or steam generators. The feedwater is introduced into the water/steam space (II) of the pressure vessel (DE) via a substantially horizontal line section (140) and a rising line section (141) following downstream thereof up to the overflow edges U at the end of the flow travel of the rising line section (141). From there, the feedwater is admixed to the medium in the water/steam space (II) or the descent space (8) of the pressure vessel (DE) via a downward-directed line section (141) and optionally, via a ring feedline (12) connected thereto. This prevents temperature stratification due to backflow of warmer water in the nozzle. It is important here to make the ratio A.sub.n /D.sub.i as small as possible. In practice it has been found to be feasible to provide a ratio which is approximately within the limits 0.5 and 2. (A.sub.

Abstract: Steam generator for nuclear power plants including a cylindrical housing, a tube bundle for conducting primary medium enclosed by the housing, at least one tube support plate holding the tube bundle, the cylindrical housing including a base member secured to the tube support plate and defining therewith inlet and outlet chambers for the primary medium, the cylindrical housing having a pair of opposing flanges on portions of the cylindrical housing located on opposite sides of the tube support plate, and flange connection means for tightly connecting the portions of the cylindrical housing on opposite sides of the tube support plate, the flange connection means being releasable for assembling and disassembling the tube bundle and including a stud bolt connection, the flanges having opposing sealing surfaces, a lip seal disposed between the sealing surfaces and having radially outwardly protruding lips tightly welded to one another, the lips having a radially inner region secured by respective circular bead wel