Siemens Aktiengesellschaft

Kraftwerk Union Aktiengesellschaft

Herbert Schramm

Roland Gottfried

Erich Haas

Hans-Heinrich Henning

Gerd Reimer

Bruno Dippel

Hartmut Lelickens

Theo Kaufl

Gerhard Landrock

Ralf Loock

Juergen Tautz

A nuclear reactor plant includes a reactor pressure vessel having a core barrel supported on a cylindrical holding structure fixed in the reactor pressure vessel. The core barrel has a lower part with at least one elastically resilient segment. A projection disposed on the segment engages under the holding structure in such a way that a wedge-like gap is formed between a lower surface of the holding structure and the projection. A wedge is braced in the gap. A method is also provided for mounting the core barrel.

Nuclear reactor plant having a reactor pressure vessel with a core

A core barrel for a reactor pressure vessel of a nuclear reactor plant has a carrying structure that is supported on an inner surface of the shroud of the barrel. The carrying structure receives a tension rod that extends parallel to the longitudinal axis of the barrel and braces the shroud in the axial direction.

Core barrel for a reactor pressure vessel of a nuclear reactor plant and

An apparatus and a method for inspecting an outer jacket of a core containment in the region of a heat shield surrounding the core containment, include a plate mounted rotatably on a bottom of a storage basin. The core containment is deposited on the bottom. A mast is deposited on the bottom next to the core containment. A vertical carriage is disposed on the mast for movement in the longitudinal direction of the mast. An outrigger which is disposed on the vertical carriage can be introduced into a region between the outer jacket of the core containment and a heat shield and has a free end which carries an inspection device.

Apparatus and method for inspecting an outer jacket of a core

An apparatus and a method for inspecting an outer jacket of a core containment in the vicinity of a heat shield surrounding the core containment, include an annular rail to be fixed to the core containment. A carriage is disposed on the annular rail for circumferential movement. A mast is supported on the carriage for axial displacement. A vertical carriage is movable along the mast in the direction of the longitudinal axis of the mast. An outrigger is disposed on the vertical carriage. An inspection device is carried by the free end of the outrigger for movement into a region between the outer jacket and the heat shield.

Core shrouds are conventionally welded together from cylindrical parts and annular flanges, wherein cracks have recently occurred in the region of weld seams in reactors of the boiling-water type. A core shroud, in particular for cladding a reactor core in a boiling-water nuclear reactor and a method for repairing a core shroud, include recesses disposed transversely relative to the circumferentially extending weld seams. The recesses have a middle part which passes through a region that is thermally influenced during welding as well as transverse grooves or widenings located in front of ends of the middle part and lying outside the thermally influenced region. A clamp which is fitted into the recess is disposed approximately flush with a shroud surface and is wedged in one of the transverse grooves.

Core shroud, in particular for cladding a reactor core in a

An apparatus for transporting and inverting core frame parts of a nuclear reactor includes a cross beam. A horizontal shaft is supported on the cross beam. A flexion and torsion-resistant basket is disposed below the cross beam for receiving a core frame part. A bearing pivotably supports the basket on the horizontal shaft. Pulleys are attached to opposite sides of the basket at right angles relative to the shaft. Positioning drives are seated at the cross beam and deflection rollers are adjustably attached to the positioning drives. Flexible tension members each lead from a respective one of the pulleys to a respective one of the positioning drives and to a respective one of the deflection rollers. The tension members are prestressed relative to the bearing for the basket.

Apparatus for transporting and inverting core frame parts of a nuclear

A device for the preparation of a gas mixture includes a closed circuit. Mixture components of a gas mixture are fed with greatly differing partial pressures ranging from low to highest partial pressures to the closed circuit. The gas mixture is circulated in the closed circuit. At least one of the mixture components with low partial pressure is replenished at increasingly shorter intervals. The gas mixture is completely exchanged when a given minimal length of the intervals is reached. At least one branch parallel to a section of the closed circuit conducts the gas mixture substantially completely free of flow losses. The at least one branch includes a magnetic valve, a differential pressure sensor in series with the magnetic valve having a total measuring range corresponding to the low partial pressures, the differential pressure sensor controlling the replenishment of the mixture components having the low partial pressure exclusively while the magnetic valve is closed, and an absolute pressure sensor controlling at least the replenishment of the mixture component having the highest partial pressure.

Device for the preparation of a gas mixture

An apparatus for propelling a continuous gas mixture stream of an inert carrier gas and an aggressive doping gas, includes an electric motor having a motor housing filled with pure carrier gas and a shaft with a shaft extension, a radial blower having an impeller mounted directly on the shaft extension and a blower housing filled with the gas mixture and coupled to the motor housing, a gas ring of pure carrier gas being continuously fed and maintained in a ring space for sealing the blower housing against the motor housing in an operating state, and a hollow sealing ring being inflated with compressed gas for sealing the blower housing from the motor housing when the blower is stopped.

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Hochstadt, Germany

Herbert Schramm