Dome tendon

Note C . The typical dome tendon spacing is 978 mm measure horiz the final prestressing force for each tendon group is 5453.25 KN/m. 

To determine the proper spacing of Dome Tendons to obtain Equal Areas of NO Prestress in Ring Girder Region size of Dome from Bulds. 

All computations for prestressing requirements will be based upon the centre of gravity of the dome tendons. 

Dome Tendons are anchored at different angles (in relation to a horizontal plane). At least every other tendon will be anchored on a different angle at... 

The containment is a prestressed reinforced concrete structure in the shape of a cylinder with a torispherical dome and a flat foundation mat. The cylindrical portion of the containment is prestressed by a post tensioning system consisting of horizontal tendons and vertical tendons. The dome is prestressed with crossed tendons that are anchored at the dome stiffening ring girder. The foundation mat is conventional reinforced concrete. 

The foundation base slab is a concrete structure conventionally reinforced with high-strength reinforcing steel. A continuous access gallery is provided beneath the base slab for the installation and inspection of vertical tendons. The base liner, installed on top of the structural slab, is covered with concrete for post-tension. The containment completely encloses the entire reactor and RCS and ensures that an acceptable upper limit for leakage of radioactive materials to the environment would not be exceeded even if gross failure of the RCS were to occur. The approximate dimensions of the containment are 124 ft (37.8 m) inside diameter, 205 ft (62.5 m) inside height, 3-1/2 ft (1.07 m) wall thickness, and 2-1/2 ft (0.76 m) dome thickness. The internal net free volume approximates 2,000,000 fC (56,600 m3). 

Design Calculations for Containment Structures 6.3.3.6 Reactor Bldg - Dome Length of Tendon... 

The tensile stress in the prestressing tendons exert a normal force on dome which depends on the radius of curvature of the tendons. T endons will have a different curvature which will result in Normal forces that vary through out the dome. 

Since the Tendons are placed in three different directions, the normal forces will have to be computed in each direction for certain critical points in dome. Each critical point will have three normal forces acting. These forces will have to be summed vertically to obtain a resultant force. Liberal sketches will be provided to locate these critical points. 

Meridional force 55 from dome (this is where dome begins transition to thickened section and where one layer of Tendons begin)... 

Tendons become tangent to curvature of dome at this point (see sheet 7) Prestress force = 522 = 333 395... 

Calculation dated 2-24-72, will take three critical locations in dome for computing normal force acting on dome from prestress. This analysis will require computation of friction losses for the following Tendon locations. 

A) Tendon Passing through dome Acl Code equation from Friction Loss... 

NOTE Effecting meridional force in dome considering three layers of tendon S = 1.5 times. 

Due to the fact that the curvature in the Tendons gets sharper (i.e. radius of curvature) as the tendons become further from dome and the normal forces that the Tendon experts on the dome increases as the Tendons becomes more remote form the of dome, then we will design on the following basis ... 

From sketch on sheet. The three groups of tendons in the dome are labelled directions A , B C . 

Dome Prestressing Tendon Normal Forces Resultants... 

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