[en] This device reduces the space required for a fuel element pond, which is arranged before a lock. This gives relatively simple kinetic conditions, which transfer a supporting tube with a fuel element from the vertical to the horizontal position or vice versa before or after the locking through process. Only one pond width is required. The supporting tube for accommodating the fuel element is first situated vertically a little above the floor of the fuel element pond, and at a distance of about 1/4 of its length in front of the left sidewall of the pond, which also contains the lock opening at the top. At the same spacing from the lower end of the supporting tube, this carries a guideroller on a horizontal axis, which runs in a straight vertical U rail at the backwall of the pond. At the upper end of the supporting tube there is a lever of about 2/3 the length of the supporting tube in ball bearings. The other end turns in a bearing block on the right sidewall of the fuel element pond. When the supporting tube is pulled up by a rope attached to the bottom, the guiding roller with the supporting tube part which it guides is moved along the U rail up to the height of the lock axis. Simultaneously the upper end of the supporting tube moves on an arc of the same height. Both movements together bring the supporting tube and fuel element from the vertical to a horizontal position, where the axis of the supporting tube axis is in line with the lock axis. (RW)