Internal built-ins container to store used reactor fuel assemblies, consisting of at least three cases (1) hexagonal cross-section of aluminum alloy, while the outside of each wall (2) absorption case (1) is formed longitudinal groove (5) in the space formed by two groove (5) of two adjacent to each other cases (1) is placed flat insert free of corrosion material and in the contact between the longitudinal groove (5) and insert are positioned surface projections (6), the aluminum alloy contains 1 to 15%. B or B4C and the insert is in the form of at least two mutually strutting parts (3), (4) and the wedge-shaped end of each of the area comprised of two grooves (5) is closed at least one terminal area (7) free of corrosion material, the terminal (7) and the adjacent wall cases (1) fitted with windows and interrelated demountable joint (8).
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