The purpose of this study was to determine the constraints imposed on the FED/INTOR fusion plants by tritium contamination in the reactor hall. Limitations imposed by gamma radiation levels and the maintenance philosophy adopted were included. The cost (capital and operating) required to maintain 5, 50 and 500 μCi/m was evaluated. Three different maintenance strategies (unsuited worker, suited worker and robotics) were studied to determine if tritium contamination placed a constraint on reactor availability.