Tritium permeation experiment using a tungsten armored divertor-simulatingmodule

A first engineering type experiment for evaluation of tritium permeation ra te through a tungsten armored divertor of a DT fusion machine was carried o ut using tritium plasma experimental (TPE) apparatus under the collaborativ e program between US-DOE and JAERI. A test module having a multi-layer stru cture (W:1 mm(t), Cu:5 mm(t) and a cavity containing water pressurized at 2 .2 MPa) was exposed to DT (D:T = 2:1) plasma. Break-through of tritium perm eation into the water was observed after 4 h of plasma exposure. The amount of tritium permeated was compared with permeation rates predicted by numer ical simulation codes (TMAP4 and TPERM). Feasibility of the experimental sy stem and procedures to predict the tritium permeation behavior was examined using the simulation codes. (C) 2000 Elsevier Science B.V. All rights rese rved.