Grabbing device of graphite blocks arranged in nuclear reactors, and apparatus and method for extracting such graphite blocks

Grabbing device (1) of at least one graphite block (20) arranged within a nuclear reactor, comprising: - a support (2) suitable for being inserted within the reactor core and on which there are arranged: - one or more anchor elements (3) configured to partially penetrate within and engage solidly with said graphite block (20); and - one or more suction cups (4) suitable for being positioned against a first surface (21) of said graphite block (20); - at least one depressurization device (10) connected to said one or more suction cups (4) through at least one suction channel (11), said depressurization device (10) generating, when operated, a depression within said one or more suction cups (4) so as to cause them to adhere to said first surface (21) of the graphite block (20).