Study of qualification process for sub-components of terminal service box

Abstract

The terminal service box (TSB) is an important component of the ITER correction coil (CC) that has a complex structure and can be manufactured by several processes. The qualification process of the TSB can be divided into sub-component qualification and overall assembly qualification. The qualification process and testing are difficult because each process exhibits non-standard properties. The qualification process of the sub-components includes the welding process qualification (resistance spot welding and vacuum brazing), insulation process qualification, and electrical test qualification. In response to the ITER Organization requirements, a mock-up was designed to meet the process qualification requirements, defining the specific methods and requirements for the implementation of a single qualification process for welding, insulation, and electricity. Based on full-size vacuum pressure impregnation of the bottom and top correction coil (BTCC) insulation sample, the overall assembly scheme of the BTCC TSB was designed. In particular, an electrical test was conducted on the entire ground insulation of the BTCC TSB prototype, and the test item, content, and acceptance criteria were determined.