Abstract: A storage rack for storing spent nuclear fuel assemblies using a minimum space of a storage pool. The storage rack includes a plurality of tubular cells with a plurality of moderating members of neutron-absorbing material coupled thereto, and a base member coupled to the tubular cells for supporting the tubular cells substantially perpendicular thereto. The tubular cells are constructed of a plurality of prebent panels forming side portions of the cells. At least one of the prebent panels form at least two of the side portions of at least two of the tubular cells which are diagonally arranged relative to each other.