Patent Number: 039309428
Section: claims

1. An installation for a fluid having an undesirable effect, comprising a normal retaining wall for the fluid, a second wall adapted to retain the fluid in the event of breakdown of the first wall, and a space between the two walls, characterized in that the surface of the first wall disposed facing the second wall is bare and the said space is adapted to receive a trolley which can travel along said surface and which is equipped with at least one repair device for the said installation. 2. Installation according to claim 1, wherein the space contains a filling, the effect of which is greatly to reduce the fall in level in the vessel bounded by the first wall in the event of leakage, said filling being displaceable by the force of the trolley. 3. Installation according to claim 2, wherein the filling is a train of coupled elements. 4. Installation according to claim 1, wherein the second wall has an access door to the inspection space, said door being intended for the trolley. 5. Installation according to claim 4, wherein the second wall is buried, the installation comprising an underground gallery leading to the access door provided with an air-lock. 6. Installation according to claim 1, wherein the device is movable over a guide track having a similar profile to that of the primary wall. 7. Installation according to claim 6, comprising means for adjusting the distance between the guide track and the primary wall. 8. Installation according to claim 1, comprising a longitudinal trolley track laid along the inter-wall space, a transverse trolley track enabling the trolley to enter and leave the space, the trolley having two wheel sets, one for each track, at least one of the said wheel sets being vertically adjustable to allow the trolley to be deposited at will selectively on the two tracks at their intersection. 9. Installation according to claim 1, wherein the space is in the form of a body of revolution. 10. Installation according to claim 1, wherein the trolley bears at least one remotely controlled, remotely monitored inspection, maintenance and repair means. 11. Installation according to claim 1, wherein the surface of the primary wall facing the second wall bears locating elements for inspection and maintenance and repair devices. 12. Installation according to claim 2, wherein the filling is formed by separate blocks adapted to serve as storage tanks. 13. Application of the features according to claim 1 wherein said normal retaining wall is adapted to receive a water reactor vessel.