A special task group was established as a part of the Blanket Comparison and Selection Study to investigate the problems associated with tritium containment in blanket systems. The goal of the task group was to review the existing experimental results and to define a set of ground rules that would form a common basis for each design group to resolve this particular problem. The work of the task group is summarized. Due to the scarcity of information, and often contradictory nature of the existing information, note that the conclusions are based on the best judgment of the task group. It is recommended that the conclusions be updated as more experimental results become available.