Method for decommissioning nuclear facilities

A method for decommissioning a nuclear facility that includes a nuclear reactor pressure vessel provided with a hemispherical lower portion and a flat upper portion, and bio-protective concrete including a cavity in which the nuclear reactor pressure vessel is positioned and a neighboring upper surface adjacent to the cavity, comprising:

• floating the nuclear reactor pressure vessel above the cavity;
• rotating the reactor pressure vessel so that the upper portion of the nuclear reactor pressure vessel is closer to the bio-protective concrete than the lower portion;
• mounting the upper portion of the nuclear reactor pressure vessel on the neighboring upper surface of the bio-protective concrete;
• and
• cutting and decommissioning the nuclear reactor pressure vessel mounted on the neighboring upper surface,
• wherein
• the nuclear facility further includes a first crane positioned above the bio-protective concrete, and
• the floating of the nuclear reactor pressure vessel above the cavity is performed by using the first crane,
• wherein
• the nuclear facility further includes a second crane that is positioned above the bio-protective concrete and is adjacent to the first crane, and
• the rotating of the nuclear reactor pressure vessel is performed by using the first crane and the second crane,
• wherein
• the rotating of the nuclear reactor pressure vessel includes:
• connecting the second crane to the lower portion of the nuclear reactor pressure vessel;
• positioning the upper portion of the nuclear reactor pressure vessel on the neighboring upper surface of the bio-protective concrete slab by using the first crane;
• lifting the lower portion of the nuclear reactor pressure vessel by using the second crane;
• and
• positioning the lower portion of the nuclear reactor pressure vessel on the neighboring upper surface of the bio-protective concrete slab by using the second crane.