| 摘要 |
The invention relates to a device for the televisual inspection of the inner surface of a closed cylindrical vessel having a vertical axis and having an access hole in its upper part. The device comprises a television camera and at least one floodlight for lighting the area to be inspected. The camera is suspended from a flexible tube which is rigid under torsion and through the inside of which pass electricity supply cables for the camera and the floodlight. The flexible tube is guided and orientated over its path from the outside into the interior of the vessel by a rigid tubular guide, and means are provided for causing the flexible tube to rotate about its axis, for releasably holding the tube and the camera against axial movement, for precisely identifying angular and vertical positions of the camera, and for centering the camera in the vessel. The device is particularly applicable to the inspection of pressurizers of a pressurized water nuclear reactor. |
