The overall dimensions of the CHT OP-TU are 45″x45″x62″ high. The transport unit is an insulated overpack with four sleeves to accommodate the Oxide Vessels. Each sleeve has its own insulated lid secured with twelve, 1/2″ bolts. The total gross weight of the CHT OP-TU is 3,757 lbs (1,704 kg) of which 1,608 lbs (729 kg) is payload.
The transport Unit is optionally constructed of 11 ga carbon or stainless steel, with polyurethane or low-chloride phenolic foam insulation. The internal steel surfaces of the Transport Unit are lined with ceramic fiber insulation (paper or board). Any external carbon steel surfaces are protected from weathering using an epoxy coating.
The four Oxide Vessels are constructed of stainless steel. Several diameters of the Oxide Vessel are available to carry the various payloads. Each vessel has its own lid. Both the Type A and Type B vessels use a double 0-ring seal. All vessels are secured with eight 1/2″ stainless steel bolts.
The CHT OP-TU is provided with lifting shackles on the upper frame of the Transport Unit, and tie down points at the Transport Unit feet. The CHT OP-TU can also be handled using a fork lift, since the feet server as location guides and the bottom of the unit is 1/4″ thick plate steel. Shielding and pressure relief devices are not required for the the CHT OP-TU payloads. Plastic plugs, designed to vent any combustion products generated by the foam insulation under hypothetical accident conditions, are located on the exterior of the Transport Unit. The payload maximum allowable decay heat of 10.3 W/m3 is negligible; thus, there is no need for heat dissipation mechanisms or coolants. The containment boundary is the individual Oxide Vessel, Oxide Vessel lid and 0-ring seal.