Ontario Power Generation's Response to the Joint Review

CLOSURE WALL CAPACITY
and are the strains in the horizontal and vertical directions, is the elastic modulus of the
concrete, and is the Poisson’s ratio of the concrete. The strains are calculated based on a dilation of 1 mm on
the sidewalls, roof and floor. Therefore, the strains in the horizontal and vertical direction are given by:
The average shear strength at the interface is given by:
where is in radians and is the friction angle of the interface (typically for concrete-rock interfaces).
Using these values, the calculated shear strength, , is:
3.5 Closure wall Capacity
The factored capacity on the face of the closure wall is given by:
for the ‘full dilation’ case; and
for the ‘no dilation’ case, where is the load factor, is the section perimeter, is the section area,
and is the gas pressure.
Assuming a load factor of , the factored capacity and the allowable gas pressure for the ‘full dilation’
approach are:
and for the ‘no dilation’ approach is:
August 27, 2012
Report No. 1011170042-TM-G2170-0001-00 4