The invention relates to a nuclear facility vessel cleaning device, comprising floating platforms (10,40,62) which is provided with floating bodies (12,14,46,48) and can float in water (80), driving devices (26,28) used to move the floating platforms (10,40,62) on the surface of a nuclear facility vessel (78) which is filled with water and is to be cleaned,
towing devices (16,54) which are connected with the floating platforms (10,40,62), pumps (20,52,66) which can be vertically hung up and down (22) through the
towing devices (16,54), the pumps being provided with suction hose (24,70) which are connected with the pumps on the first
tail ends and are used to clean the bottom of the nuclear facility vessel (78), a
remote control device (86) used to at least
remote control the driving devices (26,28) and the
towing devices (16,54), and an optional fixed
external storage tank (76). The suction hoses (24,70) optimally at least indirectly access the fixed
external storage tank (76) by the second
tail ends of the suction hoses.