A structural analysis of the International Thermonuclear Experimental Reactor(ITER) vacuum vessel's lower port region was presented by means of a finite element analysismethod.The purpose is to evaluate the stress and displacement level on this structure undervarious combinations of five designed loads,including the gravity of the vacuum vessel,seismicloads,electromagnetic loads,and possible pressure loads to ensure structural safety.The cyclicsymmetry finite element model of this structure was developed by using ANSYS code.The re-sults showed that the maximum stress does not exceed the allowable value for any of the loadcombinations according to ASME code and the nine vacuum vessel (VV) supports have the abilityto sustain the entire VV and in vessel-components and withstand load combinations under bothnormal as well as off-normal operation conditions.Stress mainly concentrates on the connectingregion of the VV support and lower port stub extension.
The lower cryopump ports in International Thermonuclear Experimental Reactor(ITER)as a part of the vacuum vessel play many important roles.As the boundary of vacuumit must be ensured against structural damage.In this study a finite element model of the lowercryopump ports was developed by ANSYS code with a purpose to evaluate the stress and dis-placement level on it.Two kinds of loads were taken into account.One was the hydrostaticpressure including the normal operation pressure and test pressure.The other was the seismicload.The analysis results show that the peak stress does not exceed the allowable stress for eitherthe hydrostatic pressure or the seismic load according to the ITER structural design criterion,which indicates that the structure has a good safety margin.
ITER in-wall shielding(IIS)is situated between the doubled shells of the ITERVacuum Vessel(IVV).Its main functions are applied in shielding neutron,gamma-ray and toroidalfield ripple reduction.The structure of IIS has been modelled according to the IVV design criteriawhich has been updated by the ITER team(IT).Static analysis and thermal expansion analysiswere performed for the structure.Thermal-hydraulic analysis verified the heat removal capabilityand resulting temperature,pressure,and velocity changes in the coolant flow.Consequently,ourdesign work is possibly suitable as a reference for IT's updated or final design in its next step.
The neutron shielding component of ITER (International Thermonuclear Experi-mental Reactor) vacuum vessel is a kind of structure resembling a wall in appearance.A FE(finite element) model is set up by using ANSYS code in terms of its structural features.Staticanalysis,thermal expansion analysis and dynamic analysis are performed.The static results showthat the stress and displacement distribution are allowable,but the high stress appears in thejunction between the upper and lower parts.The modal analysis indicates that the biggest defor-mation exists in the port area.Through modal superposition,the single-point response has beenfound with the lower rank frequency of the acceleration seismic response spectrum.But the defor-mation and the stress values are within the permissible limit.The analysis results would benefitthe work in the next step and provide some reference for the implementation of the engineeringplan in the future.
