The present invention relates to a spent nuclear fuel assembly storage container (1) comprising a metal cask (2) containing at least a spent nuclear fuel assembly and a substantially hexagonal tubular container body (3) containing a metal cask 24, 26), assembled bodies 18, 20, 22 of the spent fuel bundle housing containers 1, 24, 26, and a method of assembling the used fuel bundle housing containers 1, 24, 26.
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