Method for decommissioning nuclear facility

A method for decommissioning a nuclear facility that includes a nuclear reactor pressure vessel and bio-protective concrete including a cavity in which the nuclear reactor pressure vessel is positioned, comprising:

• lifting up an entirety of the nuclear reactor pressure vessel above the cavity from the cavity;
• positioning a mounting device directly on the bio-protective concrete to cover the cavity with the mounting device;
• mounting the entirety of the nuclear reactor pressure vessel directly on the mounting device, thereby a lower portion of the nuclear reactor pressure vessel being supported by the mounting device;
• and
• cutting and decommissioning the nuclear reactor pressure vessel mounted on the mounting device which is positioned on the bio-protective concrete to cover the cavity.