Method for carrying out reactor internal

A method for carrying out a reactor internal from a reactor pressure vessel of a boiling water reactor, comprising the steps of:

• forming a first opening portion in a ceiling of a reactor building in which said reactor pressure vessel of said boiling water reactor is disposed, the first opening portion being formed at a position directly above an equipment pool provided in said reactor building, said equipment pool being at a position in said reactor building spaced from said reactor pressure vessel;
• cutting a cylindrical reactor internal including a core shroud surrounding a core in said reactor pressure vessel disposed in said reactor building, in a circumferential direction of said cylindrical reactor internal, at one position in an axial direction while suspending said cylindrical reactor internal by a ceiling crane installed in said reactor building;
• surrounding said cut cylindrical reactor internal with a radiation shield;
• and
• carrying said cut cylindrical reactor internal surrounded by said radiation shield out of said reactor building through said first opening portion;
• wherein said step of surrounding said cut cylindrical reactor internal with said radiation shield comprises the steps of:
• transferring said cut cylindrical reactor internal from said reactor pressure vessel into said equipment pool by said ceiling crane;
• putting said cut cylindrical reactor internal transferred into said equipment pool on a bottom portion of said radiation shield which is placed in said equipment pool;
• and
• attaching said radiation shield to said cylindrical reactor internal within said equipment pool by joining an upper shell portion of said radiation shield covering a portion of said cut cylindrical reactor internal to said bottom portion of said radiation shield so as to have said cut cylindrical reactor internal surrounded by the joined upper shell portion and bottom portion of said radiation shield within said equipment pool.