Abstract: A nuclear reactor includes a vessel (1), a support plate (8), arranged in the vessel (1) above the core (2); a plurality of separate dispensing ducts (21); and support members (33) provided to keep the thermocouple ducts (21) in position. Each support member (33) includes a foot (35) rigidly attached to the support plate (8), a head (37) to which the or each thermocouple duct (21) is attached, and a detachable connection (39) from the head (37) to the foot (35).

Abstract: A nuclear reactor includes guide tubes; and vessel head penetrations each comprising a tubular adapter fixed in one of the openings and defining an inner passage. Each vessel head penetration also includes a tubular sleeve engaged in the inner passage and axially extending in line with one of the guide tubes. Each sleeve is suspended by an upper axial sleeve end lying on an upper range on the corresponding adapter. A lower axial end of the sleeve projects axially into the vessel beyond the adapter and is separated from an upper axial end of the corresponding guide tube by an axial gap having an axial height of less than 50 millimeters.

Abstract: A nuclear reactor includes guide tubes (12); and vessel head penetrations (22) each comprising a tubular adapter (24) fixed in one of the openings (2a) and defining an inner passage (34). Each vessel head penetration (22) also includes a tubular sleeve (36) engaged in the inner passage (34) and axially extending in line with one of the guide tubes (12). Each sleeve (36) is suspended by an upper axial sleeve end (38) lying on an upper range (40) on the corresponding adapter (24). A lower axial end (48) of the sleeve (36) projects axially into the vessel (1) beyond the adapter (24) and is separated from an upper axial end (54) of the corresponding guide tube (12) by an axial gap having an axial height of less than 50 millimeters.

Abstract: A nuclear reactor includes a vessel (1), a support plate (8), arranged in the vessel (1) above the core (2); a plurality of separate dispensing ducts (21); and support members (33) provided to keep the thermocouple ducts (21) in position. Each support member (33) includes a foot (35) rigidly attached to the support plate (8), a head (37) to which the or each thermocouple duct (21) is attached, and a detachable connection (39) from the head (37) to the foot (35).

Abstract: An assembly is provided that includes a device for locking tubes in position relative to one another, with at least a first arm, a locking axle having a plurality of bearing surfaces, the locking axle being movable between a position locking the tubes each between one of said bearing surfaces and the first arm, and a released position, in which the tube segments are free.

Abstract: An insertion assembly (1) includes a frame (11), having a longitudinal passage (13) for the thermocouple (3); a device (15) for blocking the pipe (5) in position relative to the frame (11); a device (17) for guiding the thermocouple along the passage (13); and a device (19) for driving the thermocouple (3). The driving device (19) includes at least a first drive belt (21) having a first longitudinal segment (25) pressed against the thermocouple (3), and a motor member driving said first segment (25) of the first belt (21) longitudinally relative to the frame (11).

Abstract: An insertion assembly (1) includes a frame (11), having a longitudinal passage (13) for the thermocouple (3); a device (15) for blocking the pipe (5) in position relative to the frame (11); a device (17) for guiding the thermocouple along the passage (13); and a device (19) for driving the thermocouple (3). The driving device (19) includes at least a first drive belt (21) having a first longitudinal segment (25) pressed against the thermocouple (3), and a motor member driving said first segment (25) of the first belt (21) longitudinally relative to the frame (11).

Abstract: An assembly is provided that includes at least one first conduit and at least one second conduit connected together through a connecting device. The connecting device includes an exteriorly threaded tube; a connecting part attached to one end of the tube and including an orifice; a holding nut screwed onto the tube and axially maintaining the connecting part relative to a tube; and a retaining member attached on the holding nut and engaging with the first conduit so as to axially retain the first conduit fitted into the orifice, the retaining member cooperating with the first conduit so as to oppose the unscrewing of the holding nut.

Abstract: An assembly is provided that includes a device for locking tubes in position relative to one another, with at least a first arm, a locking axle having a plurality of bearing surfaces, the locking axle being movable between a position locking the tubes each between one of said bearing surfaces and the first arm, and a released position, in which the tube segments are free.

Abstract: The invention relates to a device for connecting the upper (21) and lower (23) guide ducts for guiding a thermocouple for the upper internals of a nuclear reactor. The device comprises a plug (41) fastened to the lower duct (23), comprising, on the one hand, a bore (43) for accommodating an end-piece (24) on the end of the upper duct (21) and, on the other hand, locking means (45) for locking it in a housing of a sleeve (32) of a tap (30), retaining means (48, 49) for keeping the plug (41) in the locked position in the sleeve (32), and means for blocking the plug (41) and for aligning the lower duct (23) and the upper duct (21) in said sleeve (32) of the tap (30).