Structural Analyses of ITER Toroidal Field Coils under Fault Conditions

摘要

The International Thermonuclear Experimental Reactor (ITER) is intended to be anexperimental thermonuclear tokamak reactor testing the basic physics performance and technologies essential to future fusion reactors. The magnet system of the ITER reactor consists essentially of four sub-systems, i.e toroidal field coils (TF coils), poloidal field coils (PF coils), power supplies, and cryogenic supplies. These subsystems do notcontain significant radioactivity inventories, but the large energy inventory is a potential accident initiator. The aim of the structural analyses is to prevent accidents from propagating into the vacuum vessel, tritium system, and cooling system, which all contain significant amounts of radioactivity. As part of the design process three conditions are defined for the PF and TF coils, at which the mechanical behavior has to be analyzed in some detail, viz: normal operating conditions, upset conditions, and fault conditions. The paper describes the work carried out by ECN to create a detailed finite element model of sixteen toroidal field coils as well as results of some fault condition analyses made with the model. The analyses performed consist of linear elastic stress analysyese and electromagneto-structural analyses (coupled field analyses).