Electricite De France - Service National

Electricite De France

Antoine Gemma

A system for working on the water box of a nuclear power station steam generator comprises a first member having a substantially elongate shape and forming a first arm of the system and a second member having a substantially elongate shape. The second member is articulated at one end to one end of the first member. The combination of the first and second arms is adapted to be inserted into the water box of the steam generator through the manhole. The second member may be moved to a deployed position relative to the first member. A vehicle mounted on and mobile relative to the second arm is used to scan and decontaminate the various parts of the water box of the steam generator. A working device such as a decontamination device is carried by the vehicle. It is able to reach a plurality of areas on the internal surface of the steam generator. A remote control system is provided for the vehicle and the working device.

System for working on the primary pipework and water box of a nuclear

A machine (3) for cleaning tapped holes (2) distributed around the periphery of an opening (1), e.g., those tapped holes used for peripherally bolting on a cover for an armhole or an eyehole in a steam generator of a nuclear power station. The machine comprises a grip (4) for centering and clamping the machine on the opening, thereby enabling it to be positioned on the axis (12) of the opening and to be held in position by abutment against the wall (10) of the opening; and a brush (13) disposed at a fixed radial distance from the axis of the opening. The brush is movable both in rotation about the axis (12) of the opening so that the trajectory of the brush describes a circle intersecting the axes of the various tapped holes distributed around the periphery of the opening, thereby enabling the brush to be selectively positioned over each of the tapped holes; and in axial translation along an axis coinciding with the axis of a tapped hole so as to enable the brush to be inserted into and withdrawn from the tapped hole.

Machine for cleaning tapped holes used for affixing the covers to

The invention relates to a device for brushing the gasket face of a manhole for gaining access to the inside of a vessel. The invention comprises a main frame (100), a secondary frame (200) mounted to rotate relative to the main frame (100) about an axis (101) which is coaxial with the manhole, and a brushing mount (300) supported by the secondary frame (200) and capable of oscillating about a second axis (102) transversal to the axis (101). Motor means (105 and 205) separately rotate the secondary frame (200) and the brush (301), thereby enabling effective tangential brushing to be performed. The device also includes a continuous suction passage (500) passing through the inside of the secondary frame (200) and through the oscillating brushing mount (300), and opening out into the brushing zone. The invention is particularly applicable to brushing the gasket face of a manhole in a steam generator or pressurizer of a nuclear power station.

Device for brushing the gasket face of a manhole for gaining access to

The invention relates to an apparatus for survey and/or treatment of a smooth curved surface. The apparatus comprises a vehicle able to be moved on the surface along a predetermined path, the vehicle being provided with abutment means movable with respect to the body of the vehicle. A support arm of the vehicle is fixed to this by a swivel pivot point. The support arm is fixed close to the center of curvature of the curved surface. The axes of the abutment means and of the arm of two supports can be oriented to be substantially concurrent in the vicinity of the center of curvature of the curved surface. Means for survey and/or treatment of the curved surfaces are fixed to the vehicle. Means for control of driving of the vehicle and of the survey and/or treatment means are also provided. Application to the survey and to the maintenance of water boxes of steam generators of electo-nuclear power stations.

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Meudon, France

Antoine Gemma