Modeling of the stress-strain state of ITER upper ports №2 & №8 constructions’ components under thermal, electromagnetic and inertial loads

Abstract

This paper presents the results of calculations of the upper port plug (UPP) of the ITER upper ports №2 and №8. Detailed finite-element models of the UPP structure were developed taking into account nonlinear contact interaction between the diagnostic shield module with extension frame and the UPP structure. In the structural analysis under design loads the stress-strain state (SSS) taking into account bolts pretension was obtained. Besides, the FE model includes cooling system pipes and boron carbide shielding. In the thermal analysis of the UPP for baking and normal operation modes the neutron analysis data was taken into account. The UPP cooling systems’ hydrodynamic characteristics were calculated including the flow-pressure characteristics. Subsequently, the whole UPP construction flow and pressure characteristics were evaluated taking into account the presence of throttling devices in the UPP hydraulic circuit. Structural analysis of the UPPS during seismic and electromagnetic events was carried out using the response spectrum method based on the response spectra at the UP point of the ITER building and interface electromagnetic loads due to the vacuum vessel movements respectively. The FE model includes port extension from the generic upper port plug model. Except this, the response spectra at the tenant attachment points were calculated using power spectral density analysis. Laplace force distribution in the UPP under different scenarios of plasma disruption was calculated. The electromagnetic model was significantly refined and includes the extension frame trays. Based on the electromagnetic analysis data, the structural analysis of the UPP under electromagnetic loads was carried out.