Patent Number: 049869531
Section: claims

1. Device for the support and positioning of means for checking and tools for working on fuel assemblies of a water nuclear reactor which are immersed in a pool under a certain depth of water, characterized in that it comprises: a control station (2) having a support (6) fixed on the edge (3) of the pool,  a rod (4) connected to the support of the control station at its upper end (5) and disposed in a substantially vertical position inside the pool so as to present a part located opposite at least one fuel assembly disposed inside the pool,  means (35, 36) for adjusting the inclination of the rod (4) relative to the vertical direction and for immobilizing the rod in at least one inclined position, which means are fixed on the support (6) of the control station (2),  a carriage (10) mounted so as to be movable along the length of the rod (4) interacting with guide means carried by the rod (4),  means (40, 41, 42, 43) for displacing the carriage (10) which are controlled from the control station (2),  at least one tool support (12) intended to receive at least one means for checking (13) and at least one work tool (59),  an assembly (50) for displacing the tool support (12) in two different directions perpendicular to the axis of the rod (4), carried by the carriage (10),  means (56, 57) for controlling the displacements of the tool support (50) which can be activated from the control station (2),  and means (61, 63) for controlling the means (60) for checking and the tool (59) from the control station (2). 2. Device according to claim 1, characterized in that the support (6) of the control station (2) comprises a vertical structure (30) in which is mounted so as to move in rotation a horizontal screw (34), and in that the upper part (5) of the rod (4) comprises a fixing part (32) presenting a nut engaged on the screw (34) so as to interact with this screw (34) in order to ensure the displacement of the rod in a horizontal direction which is substantially parallel to the edge of the pool (3) by rotating the screw (34) in one direction or another. 3. Device according to claim 2, characterized in that a shaft (35) parallel to the screw (34) is situated below this screw and mounted so as to move in rotation in the vertical support (30), the shaft (35) being integrally attached in rotation to a cam resting on the fixing part (32) of the rod (4) in order to ensure the rotational inclination of the rod (4) about the screw (34), the cam being activated by rotation of the shaft (35) in one direction or another. 4. Device according to claim 1, characterized in that the means for displacing the carriage consists of a winch (40) fixed on the upper part (5) of the rod (4) comprising a cable (42) wound on a drive pulley (41) whose end opposite to the pulley (41) is connected to the carriage (10). 5. Device according to claim 1, characterized in that it also comprises a screw device (44) for adjusting the vertical position of the rod (4). 6. Device according to claim 1, characterized in that the assembly (50) for displacing the tool support (12) in two directions perpendicular to the axis of the rod (4) consists of a carriage device with crossed displacements in two perpendicular directions. 7. Device according to claim 6, characterized in that the carriage with crossed displacements comprises two carriages with longitudinal displacement which form the tool support and which can be connected in order to be displaced simultaneously or, on the other hand, can be independent. 8. Device according to claim 7, characterized in that at least one of the carriages may be disengaged during certain phases the work operation. 9. Device according to claim 6, characterized in that the carriage assembly (50) with crossed displacements is carried by the carriage (10) which is movable along the axial direction of the rod (4) by means of a pivoting assembly (47, 48). 10. Device accordinq to claim 9, characterized in that the pivoting assembly (47, 48) comprises a device (54) for adjusting and immobilizing which can be activated remotely. 11. Device according to claim 1, characterized in that the means for controlling the displacements of the tool support (12) and the means for controlling the tool and the means for checking from the control station (2) consist of ball remote controls. 12. Device according to claim 1, characterized in that the control station (2) consists of a support (6) on which is mounted a platform (24) and a support (30) for the upper end (5) of the rod (4), the assembly of the control means being accessible to an operator from the platform (24).