Siemens Aktiengesellschaft

Hans Rottger

Otto Muller

Wolfgang Berger

Hans Kastl

Hans-Gunter Hagen

A steam generator has an upstanding tube bundle radially enclosed by a vertical cylindrical wall, the tube bundle being centered within the wall by a tube spacer grid connected to the inside of the wall by keys and keyways which can slide vertically relative to each other, relieving the tube bundle and wall from mechanical stressing due to vertical thermal expansion and contraction causing relative vertical movement between the tube bundle and wall.

Steam generator, tube-bundle centering arrangement

An apparatus is provided for use with a pressurized-water reactor's steam generator having a manifold chamber enclosing the bottom side of a horizontal tube sheet having holes therethrough in which are mounted the tubes of a heat exchanger tube bundle, the manifold chamber having a manhole giving access to the tube's bottom side to permit internal inspection or repair of the tubes by registration of an end of a flexible guide conduit with the tube sheet holes and through which a flexible carrier can be guided for insertion via these holes in the tube sheet and through the tubes extending from the tube sheet's other side. The apparatus is a light-weight fixture which is manually insertable through the manhole and comprising a beam, means for detachably supporting the beam horizontally in the chamber beneath the tube sheet's bottom side, a horizontal cantilever arm having one end provided with means for supporting the aforementioned guide conduit with its end pointing upwardly and means for mounting the other end of the arm on the beam for horizontal movement of its end having the guide conduit supporting means. The carrier is a flexible hose insertable through any one of the heat exchanger tubes, and being tubular, the carrier hose can carry conductors from an inspection or repair device mounted on the inner end of the carrier hose, back to the relatively safe, remote location for measuring or controlling purposes. The apparatus has additional features.

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Weiher, Germany

Hans Rottger