Torispherical Shell Surfaces of the Reactor Vessel Top Dome

2 Torispherical Shell Surfaces of the Reactor Vessel Top Dome 

The torispherical shell surface is formed when a toroidal segment is inserted between a spherical and a cylindrical cap. The dome surface is always used as well for the reactor vessel. 

The geometry of this shell is shown in more detail in Fig. 4.18. 

In terms of the radii of curvature of the sphere ai, the toroid a and the cylinder a2, the meridional angle at the sphere—toroid junction is given by 

In practice, the radius of the toroid is selected so as to provide smooth transitions at both ends. 

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