We consider an initial condition problem in a nearly quadratic chaotic inflation model in supergravity .
We introduce shift symmetry breaking not only in the superpotential but also in the Kahler potential .
In this model the inflaton potential is nearly quadratic for inflaton field values around the Planck scale , but deviates from the quadratic one for larger field values .
As a result , the prediction on the tensor-to-scalar ratio can be smaller than that of a purely quadratic model .
Due to the shift symmetry breaking in the Kahler potential , the inflaton potential becomes steep for large inflaton field values , which may prevent inflation from naturally taking place in a closed universe .
We estimate an upper bound on the magnitude of the shift symmetry breaking so that inflation takes place before a closed universe with a Planck length size collapses , which yields a lower bound on the tensor-to-scalar ratio , r \mathop { } _ { \textstyle \sim } ^ { \textstyle > } 0.1 .