Abstract: A combination pressure vessel and pressure protection installation for the pressure vessel includes a connector pipe connected to the pressure vessel. A valve assembly has a housing block disposed directly on the connector pipe and has at least one safety valve to be hydraulically actuated by a medium brought from the pressure vessel. Lines bring the medium to the safety valve. The lines are guided in segments inside the pressure vessel, the connector pipe and the housing block.

Abstract: A nuclear reactor plant has a containment shell, a secondary shield enclosing the containment shell and defining therewith an annular space therebetween and a double pipe of a live steam or feedwater line passing through the annular space and formed of a pair of inner and outer pipe portions defining an annular space therebetween. A support member supports an end of the double pipe in vicinity of the secondary shield, the support member having a substantially conical outer surface and being formed with an annular recess communicating with and terminating the annular space formed in the double pipe. Also provided are means for supporting the other end of the double pipe in the containment shell while affording longitudinal movement of the other end of the double pipe.

Abstract: For zone-wise shuffling of the fuel elements of a nuclear reactor core, single ones of the elements, one after another, are removed sequentially, and immediately upon the removal of each element it is tested for cladding defects, and if free therefrom, immediately inserted back in its new position in the reactor core, elements having cladding defects being eliminated. An apparatus for the rapid testing of each removed element is provided by a testing chamber containing water in which the removed element is immersed and allowed to remain for a short time, the water then being removed and tested for gamma activity to determine the element's cladding integrity. Other features are disclosed.