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.
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