摘要:
The invention relates to a device for closing a pipe opening (7), opening upwards, of a drive casing pipe (1) accommodating the control rod drive of a boiling water reactor, said device comprising a closure plug (8) with a plug housing (10), opening downwards, a sealing element (13) guided axially so as to be movable within the plug housing, which element has a sealing face (15) providing a sealing contact with an annular counter face (16) defining the pipe opening (7), a locking element (14) provided to fix the plug housing (10) on the drive casing pipe (1), and a spring (26), which is supported by the upper end thereof on the plug housing and by the lower end thereof on the sealing element and holds said element in a lower end position.
摘要:
The invention relates to a nuclear power plant in which the sluice (10) between a fuel pool (4) and a reactor cavity (2) is provided with a contactor (36), with which the sluice (10) is automatically locked when the water level (h) in the fuel pool (4) falls under a predetermined threshold value (h G ).
摘要:
The invention relates to a connecting assembly of a centering pin (10) on a core grate (3) of the reactor pressure vessel (1) of a pressurized-water reactor, which centering pin is used to center a fuel element (2), wherein the centering pin (10) is retained in an accommodating bore (16) of a plate (4) present on the core grate (3), with an expanded projection (19) protruding from the accommodating bore (16), in such a way that a form closure is formed. In a pre-assembly state, in which said form closure does not yet exist, the fixing segment (18) is a hollow cylinder, which has, over the entire length of the hollow cylinder, an outer circumferential surface (27) that extends on the lateral surface of a circular cylinder having uniform outside diameter (26). In a final assembly state, the projection (19) is expanded as a consequence of an expansion by means of an expanding tool in such a way that said form closure is formed.