Detail procedure of pressure and baking test for ITER vacuum vessel lower port stub extension

Abstract

The procedure of factory acceptance test for ITER vacuum vessel lower port stub extension has been set to that visual test, pressure test, baking, vacuum leak test, and final dimensional inspection as listed order. Among them, the pressure test and the baking are challengeable to meet the required conditions because of the nuclear pressure equipment. The full pressure test condition has been set to 3.78 MPa, and the baking condition has been set to 200 °C during 24 h as well. The structural and thermal analysis have been conducted to verify the structural safety and predict thermal effect under the actual conditions, respectively. As a result, the optimal test configurations have been established. During the pressure test, dimensional verifying points are set based on the structural analysis results. Moreover, the convective baking method has been regarded as the optimal way because of complex double wall structure and difficulty of heating rate control. In this paper, whole procedure of the factory acceptance test for the lower port stub extension is introduced, and detail method of pressure test and baking have been reported.