Apparatus for storing and/or transporting radioactive materials

A ventilated apparatus for transporting and/or storing radioactive materials comprising:

• an overpack body having an outer surface and an inner surface forming an internal cavity about a longitudinal axis;
• a base enclosing a bottom end of the cavity;
• a lid enclosing a top end of the cavity;
• a plurality of outlet ducts, each of the outlet ducts forming an air outlet passageway from a top portion of the cavity to an external atmosphere;
• a bottom portion of the overpack body formed by a plurality of segments, each of the segments extending from a first end wall having a projection to a second end wall having a channel;
• and
• the segments circumferentially surrounding the longitudinal axis and arranged in an intermeshing and spaced-apart configuration such that the projections of the first end walls of the segments project into the channels of the second end walls of adjacent ones of the segments, thereby forming an inlet duct between adjacent ones of the segments that includes an air inlet passageway from the external atmosphere to a bottom portion of the cavity through which a line of sight does not exist from the cavity to the external atmosphere.

A ventilated apparatus for transporting and/or storing radioactive materials comprising:

• an overpack body having an outer surface, an inner surface forming an internal cavity about a longitudinal axis, and a top surface;
• a base enclosing a bottom end of the cavity;
• a plurality of air inlet ducts, each of the air inlet ducts forming an air inlet passageway from an external atmosphere to a bottom portion of the cavity;
• and
• a lid enclosing a top end of the cavity, the lid configured so that a plurality of air outlet passageways are at least partially defined by an interface between the lid and the top surface of the overpack body, each of the air outlet passageways extending from a top portion of the cavity to the external atmosphere.