Strength evaluation of vacuum vessel for swimming pool type tokamak reactor, 1

The structural strength of the vacuum vessel for Swimming Pool Type Tokamak Reactor (SPTR) has been evaluated. The vacuum vessel which has a non-circular poloidal cross section is subjected to an external pressure (hydraulic plus atmospheric pressure). Several problems caused by the external pressure were studied. Two dimensional stress analysis for several types of toroidal shells which have different poloidal cross sections was conducted to obtain the general deformation behaviors due to the external pressure. Three dimensional stress analysis was conducted to obtain more exact and detailed deformation and stress of the vacuum vessel. The buckling pressure (namely collapse load) was estimated and the strength of the vacuum vessel to withstand the electromagnetic force caused by plasma disruption was also evaluated. (author)