A steel flange bolts to the base, and the main body of the packaging is centered within the jacket by steel tubes welded to the jacket inner wall. Steel lifting loops are typically welded to the top corners, and tie-down devices are welded to the sides. The contents of the package typically consists of byproduct material in special form. A sketch of a typical Type B special form package is presented in Figure A8-1 . The principal safety function of the package is to provide radiation shielding.
Containment is provided primarily by the special form source itself.
The packaging must maintain the sources in the fully shielded configuration under normal conditions of transport and hypothetical accident conditions. The lead shield provides shielding for gamma radiation. The protective jacket provides structural and thermal protection to the main body, which contains the special form radioactive material. The review of the general information verifies that the contents are special form. The structural and thermal reviews evaluate the ability of the shield to perform its intended function under normal conditions of transport and hypothetical accident conditions.