Removable platform for working inside casings, such as pressurizers in pressurized water reactors

摘要

The removable platform comprises a chute (14) comprising a handling and fastening unit (18, 19, 14a) at one of its ends and a supporting part (14b) in the shape of a laterally open cylindrical part extending the shell (14a) substantially in its axial direction, a supporting shaft (16) mounted articulated at the end of the chute, a set of supporting arms (15) mounted on the support shaft (16) so as to pivot around the axis (29) of the supporting shaft (16) and a plurality of flat components (17) intended to rest on the supporting arms (15) in deployed position to form a working platform substantially over the whole cross-section of the enclosure (2). The removable platform is introduced into the enclosure (2) in the folded state; the arms (15) form a set (30) housed in the chute (17) and the supporting shaft (16) has its axis (29') substantially perpendicular to the lengthwise direction of the chute (14). The supporting shaft (16) and the arms (15) are then swung down so that the axis (29) of the supporting shaft (16) coincides with the axis (20) of the enclosure (2). The arms (15) are then deployed by pivoting about the axis (29) of the supporting shaft (16) and the flat components (17) are placed on the supporting arms (15) in deployed position. …IMAGE…