METHOD OF INSTALLING BIOLOGICAL SHIELD Russian patent published in 2012 - IPC G21F7/00 

FIELD: physics, nuclear.

SUBSTANCE: invention relates to nuclear technology and can be used to rehabilitate spent nuclear fuel storages, including emergency storages. The method of installing a biological shield, where contaminated areas are cleaned and localised, end caps are removed from cells, bushings closed by covers are installed and the cells are labelled. The height of bushings for each cell are remotely determined; a loading platform is installed, on which there is a loading machine, the necessary equipment, support bushings and elements of the biological shield, wherein the elements are made in form of three-dimensional articles with a stepped shape, one of which is in form of three parallelepipeds of the same thickness making up a single unit, lying on the same axis with squares of decreasing size in the base, and the other elements are in form of parallelepipeds of the same thickness making up a single unit, said thickness being equal to that of the first elements, lying on the same axis; the top and bottom parallelepipeds of the second elements are equal to each other and are turned relative each other by 90 degrees; the short sides of rectangles lying in the base of the top and bottom parallelepipeds are equal to the sides of the smaller square lying in the base of the parallelepiped of the first element, and the long sides are equal to sides of the bigger square, lying in the base of the parallelepiped of the first element; the middle parallelepipeds of the first and second elements are equal to each other; the size of the elements is selected such that each of them has at least three points of support; radiation contamination is measured and decontamination is carried out if necessary.

EFFECT: invention enables to install an assembled biological shield in a real spent nuclear fuel storage with minimum radiation hazard for personnel.

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