Abstract:
A cylindrical supporting structure is connected integrally with a prestressed concrete pressure vessel for a nuclear reactor for supporting the pressure vessel thereon. The supporting structure is formed with a plurality of circumferential slits or separating surfaces to be divided into a plurality of concentric cylindrical elements so as to minimize the horizontal shearing stress produced mainly due to the thermal expansion of the vessel. Further, a plurality of radial slits or separating surfaces may be provided in the concentric cylindrical elements so as to minimize the circumferential tensile stress appearing in the cylindrical elements.