Several institutes of the Forschungszentrum Karlsruhe are currently contributing to tritium-related research for fusion reactors. The overall objective of this work is the provision of sound technologies and proven components for the torus exhaust gas processing system of ITER and investigations into key technologies for the fuel cycle of fixture power plants. The work also addresses safety issues, assessing by modeling the radiological consequences of tritium in the atmosphere under normal and offset operation conditions of the plant. Moreover, a tritium-beta-decay experiment to measure the mass of the electron neutrino is planned.