The total tritium inventory in NUWMAK may amount to more than 10^ Ci. In order to limit tritium releases from NUWMAK to less than 10 Ci per day, tritium losses must be limited to one part in one hundred million on a daily basis. Essentially perfect containment of tritium depends on clearly identifying possible routes of tritium release. During normal operation, potential sources of tritium loss include the plasma fueling and fuel purification components, energy-storage equipment (both normal and emergency), tritium breeding and extraction system components, and the first wall and blanket coolant. Tritium containment associated with each of these systems is examined in the analysis of a multi-layer containment system. The three-level containment system (Fig. 3.14) is designed to deal with tritium release under both normal and abnormal conditions. Each level prevents the dilution of released tritium, so that it can be recovered before permeating to the next barrier. The primary containment system consists of those pipes and other structural elements that contain tritium or tritium- bearing materials. The secondary containment system consists mainly of a second physical barrier around the primary system components: for example, primary system piping outside the plasma chamber is contained within larger-diameter piping. A slowly flowing inert gas is passed through the annulus and monitored for tritium leakage. Large pieces of equipment requiring maintenance or adjustment are enclosed in glove boxes. Fig. 3.14 Tritium Effluent System Design
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