No abstract available

[en] The steam raising unit consists of a bundle of straight pipes, which includes a superheater, an evaporator and a preheater part. Hot helium enters the superheater in the upper area. The lower part of the bundle of straight pipes is separated off by a plate, where the individual pipes in this space free of coolant gas are made as compensation pipes. The stresses on the individual pipes at the feedwater inlet are considerably reduced in this way. (DG)

[en] A pressure vessel is to be developed which is suitable in particular for the cold area of nuclear power plants, constructed so that in case of failure (bursting) the effects, e.g. blast wave and/or pieces flying about are reduced to a permissible level. Furthermore, in-service inspections on the pressure vessel must be easy. This is achieved by placing within the pressure vessel a pressure-proof container having at least one duct; in between the pressure vessel and the container there is a gap provided with a number of supports. (orig.)

[en] In order to be able to construct the shaft seal without having to reduce the pressure in the pressure vessel, the drive shaft is made in two parts. A static seal is situated around the lower part of the shaft, which can be moved to the sealed position by an actuating mechanism and to the unloaded position by spring force. The actuating mechanism acts via a pressure screw on to a tilting disc situated on the lower part of the shaft, which in turn compresses several seal holders mounted on the shaft via a pressure plate, which presses the seals on to the shaft. (orig./HP)

[en] The claim relates to the construction and arrangement of parts of a fuelling machine for the dosed transmission and distribution of spherical fuel elements. The device is assembled from hexagonal, prismatic blocks like an assembly of prefabricated machine parts, so that parts are easily interchangeable. The blocks, having the same external dimensions and a through hole of the same diameter for a pneumatically operated lifting piston, contain all the connecting holes required for various functions, so that no intermediate pipework is required for prisms arranged close together in space. (UA)

[en] This device for gas-cooled reactors consists of an immersion tube connected gas-tight to the liner and situated inside the reactor, and a guide tube which penetrates through the container wall, which projects into the immersion tube. The guide tube accommodates several interchangeable detectors and a bar. Protection against pressure loss and the release of gas is guaranteed. (HP)

[en] A radiation shielding for breaking-through or taking-out part of a wall in nuclear reactors, in particular in gas-cooled nuclear reactors in prestressed concrete containments is to be developed providing safe shielding of the radiation diffusing through gaps between components. Furthermore, such shielding must be simple in its structure and easy to apply, irrespective of the shape of the gap. This is achieved by providing the gap between the penetration liner covering the lateral sides of the break-through and the component introduced into it with a chase to be filled with shielding matter, and by introducing several bolts into the chase in order to displace the shielding matter. (orig./RW)

[en] For the transmission of drive impulses through walls, a driving shaft is suitable which is gas-tight and pressure-tight supported in the wall openings. For the gas-tight and pressure-tight sealing of the areas separated by the walls are connected in series four ring-shaped soft seals and a circular chamber filled with lubricants is located between the second and third seal. This lubricant chamber communicates with a diaphragm pressure reservoir situated outside the wall entrance one chamber of which is filled with the same lubricant and the other with high-pressure gas. The gas exerts pressure through the diaphragm onto the lubricants and continually replenishes the lubricant chamber. The pressure in the lubricant chamber is higher than the pressure in the area to be sealed. It can constantly be checked by means of a pressure gauge. Besides, with a leakage measuring device located on an additional lubricant chamber around the driving shaft, the sealing of the driving shaft wall entrance can be checked. (DG)

[en] The TV camera for repeat testing in pebble bed reactors is situated in a tube and is cooled. The objective lens and/or mirror are connected to a motor. The light source and motor or motors are made as separate components, which can be assembled in various combinations in modular form. (HP)

[en] An absorber rod is described which is screw-shaped and can be driven in and out by simultaneous longitudinal and twisting movement. In piles of spherical fuel elements, such as occur in high-temperature reactors, the rod acts as a feed screw where unallowed loads on fuel elements and operating elements or reflector devices are prevented. (ORU)