Proposal for Secondary Enclosure Setup for Experiments to Expose Plasma Facing Materials to Tritiated Plasma in Visioni

SCK.CEN 's VISIONI has the capability to expose candidate plasma facing materials to tritium _ deuterium plasmas at ITER first wall conditions. To protect operators against exposure to a tritiated atmosphere VISIONI must be placed in a secondary confinement. The current Tritium lab at SCK.CEN has a walk-in process cell which can be used to enclose the plasma chamber and diagnostics of the VISIONI setup, which have a limited tritium inventory. This allows easy accessibility to the setup in a well-ventilated environment. Routine operations should be conducted from outside the process cell and maintenance operations can be conducted from within the process cell with proper protections. The tritium storage and supply can be enclosed in a glove box with a dedicated air detritiation system which is activated during an experiment or in case of an incident. The detritiation system will oxidize tritium and capture it on molecular sieves. By using this confinement approach it is possible to expose materials to a tritiated plasma while maintaining good accessibility of the VISIONI setup. This paper describes the proposed confinement system and compares it to the most common approach where the entire system is enclosed into one large glovebox.