A complete loss of coolant accident (LOCA) analysis for the inboard component of ITER CDA

A two-dimensional thermal transient analysis, r-/spl theta/ model, has been performed to study three cases of total LOCA in the inboard components for the ITER CDA design using realistic assumptions. The study shows that the first wall can withstand the surface heat flux without active cooling for an extended period of time longer than the 10 seconds normally assumed for the plasma to continue operation after the onset of LOCA. No melting at the first wall or at the blanket is expected, but the lead at the back of the vacuum vessel reaches the melting point within about two days after the onset of LOCA without active cooling. At this time, the front of the vacuum vessel will reach about 600/spl deg/C. The temperature of the vacuum vessel will rise above 800/spl deg/C in a week.